Calculate the growth of your Money Market Account with regular contributions and compounding interest.
Final Balance after 5 years
$19,693
Effective APY: 4.602% (Daily compounding)
Final Balance
$19.7K
After 5 yrs
Total Contributions
$17.0K
Initial + monthly
Interest Earned
$2.7K
At 4.5% APY
Effective APY
4.602%
With daily compounding
Growth Multiplier
1.16×
vs total deposited
Interest Share
13.7%
Of final balance
Contributions (sky) stacked with interest earned (lighter)
| Year | Contributions | Interest Earned | Balance |
|---|---|---|---|
| 0 | $5,000 | $0 | $5,000 |
| 1 | $7,400 | $280 | $7,680 |
| 2 | $9,800 | $684 | $10,484 |
| 3 | $12,200 | $1,217 | $13,417 |
| 4 | $14,600 | $1,885 | $16,485 |
| 5 | $17,000 | $2,693 | $19,693 |
A money market account (MMA) is a federally insured deposit account that combines the interest-earning benefits of a savings account with some of the accessibility features of a checking account — including check-writing privileges and, at many institutions, a debit card. MMAs are offered by banks and credit unions, earn compound interest on your balance, and are insured by the FDIC (at banks) or NCUA (at credit unions) up to $250,000 per depositor per institution.
The defining characteristic of a money market account is the combination of safety, yield, and liquidity that no other single account type offers simultaneously. While investment accounts can earn more over long periods, they expose you to market risk. While checking accounts are maximally liquid, they earn little or no interest. MMAs occupy a valuable middle ground — especially for emergency funds, short-term savings goals, and cash reserves that should not be tied up in illiquid instruments.
Money market account interest rates are closely tied to the federal funds rate set by the Federal Reserve. During the 2022–2023 rate-hiking cycle, competitive MMA APYs rose from near-zero to over 5%, making MMAs genuinely attractive savings vehicles for the first time in over a decade. Understanding how to compare MMA rates — and how to project growth using a money market calculator — helps you maximize the return on cash you cannot afford to put at risk.
Money market accounts as we know them today trace their origins to the late 1970s, when rising inflation and Regulation Q — the federal rule capping bank deposit rates — created a mismatch between what banks could legally pay and what money market mutual funds (which were unregulated) were offering. Savers fled bank deposits for money market funds, which were yielding 10–15% in the early 1980s. The depository institutions fought back by lobbying successfully for the Depository Institutions Deregulation and Monetary Control Act of 1980 and the Garn-St. Germain Act of 1982, which authorized federally insured money market deposit accounts. The product was an immediate phenomenon: banks attracted $300 billion in deposits within the first few months of offering MMAs in late 1982.
For the three decades from 2009 to 2022, near-zero federal funds rates made money market accounts functionally irrelevant as yield vehicles. MMA APYs hovered at 0.01–0.10%, earning a $10,000 balance less than $10 per year in interest. This dormant period changed dramatically when the Federal Reserve raised rates 11 times between March 2022 and July 2023, bringing the federal funds rate from 0–0.25% to 5.25–5.50%. Competitive online bank MMAs followed, with top rates rising above 5% APY by late 2023 — the highest in over 15 years. This rate environment transformed MMAs from an afterthought into a genuinely attractive savings vehicle, and the money market account calculator became a meaningful planning tool once again.
The money market calculator on this page projects your account balance over time based on your starting deposit, monthly additions, APY, and time horizon. By comparing projections at different rates, you can quantify exactly how much a seemingly small rate difference costs you over months or years — a powerful argument for shopping beyond your existing bank and choosing the highest-yield FDIC-insured option available.
The calculator uses monthly compounding to simulate how your MMA balance grows over time. Each month, it multiplies your running balance by (1 + APY/12), adds any monthly contribution, and records the new balance. This process repeats for the specified number of months, producing a precise projection of your ending balance, total contributions, and total interest earned.
Starting Balance: The amount you are depositing or already have in the money market account.
Monthly Contribution: Any regular monthly deposit you will make in addition to the starting balance. Can be $0 for lump-sum projections.
Annual Percentage Yield (APY): The annual return rate advertised by the bank, which already accounts for compounding frequency.
Time Period: The number of months or years you want to project the account balance.
Monthly Fee (optional): Any monthly maintenance fee charged by the bank, deducted from the balance each month to show net growth.
Ending Balance: Your projected account total at the end of the selected period.
Total Contributions: The sum of your starting deposit plus all monthly additions.
Total Interest Earned: The amount generated by compound interest — money earned simply from holding a balance.
Effective Net APY: The true annual return after fees, if a monthly maintenance fee is entered.
MMA growth follows the standard compound interest formula with an optional annuity component for regular contributions. Banks advertise APY, which simplifies the calculation: you can use APY directly as the annual rate without separately accounting for compounding frequency.
FV = PV × (1 + APY/12)^n + PMT × [(1 + APY/12)^n - 1] / (APY/12)
FV = ending balance | PV = starting balance | APY = annual percentage yield | n = months | PMT = monthly contribution
Inputs: Starting balance = $20,000 | Monthly contribution = $500 | APY = 4.8% | Time = 24 months
Step 1: Monthly rate = 4.8% / 12 = 0.4% = 0.004. n = 24 months.
Step 2: Lump-sum growth: $20,000 × (1.004)^24 = $20,000 × 1.1002 = $22,004.
Step 3: Contribution growth: $500 × [(1.004)^24 - 1] / 0.004 = $500 × 25.05 = $12,525.
Result: Ending balance = $22,004 + $12,525 = $34,529. Total contributed = $20,000 + $12,000 = $32,000. Interest earned = $2,529.
This example quantifies the real-dollar cost of staying with a low-yield traditional bank MMA versus switching to a competitive online institution — the single most impactful MMA decision most people can make.
Scenario: $30,000 balance | Monthly contribution $300 | Time: 36 months
Traditional bank MMA (APY 0.50%):
Monthly rate = 0.50% / 12 = 0.04167%. Lump sum: $30,000 × (1.0004167)^36 = $30,451. Contributions: $300 × [(1.0004167)^36 − 1] / 0.0004167 = $10,827.
Ending balance: $41,278 | Total contributed: $40,800 | Interest earned: $478
Online bank MMA (APY 4.80%):
Monthly rate = 4.80% / 12 = 0.40%. Lump sum: $30,000 × (1.004)^36 = $34,454. Contributions: $300 × [(1.004)^36 − 1] / 0.004 = $11,817.
Ending balance: $46,271 | Total contributed: $40,800 | Interest earned: $5,471
Difference: $4,993 in additional interest over 3 years — on the same money, at the same risk level. The only variable is which institution holds the account.
The difference between a 0.5% traditional bank MMA and a 4.8% online bank MMA is not cosmetic — it is real money left on the table or captured. On a $25,000 emergency fund held for 2 years, the traditional account earns $250 while the online account earns $2,390 — nearly $2,150 in additional interest for the same money at zero extra risk. The calculator makes this invisible opportunity cost visible and immediately actionable.
For emergency funds specifically, the money market account is the gold standard. Unlike stocks or bonds that can lose value precisely when you need money most (during a job loss or health crisis), an FDIC-insured MMA always returns your principal plus interest. The liquidity and safety combination means your emergency fund is available without question, while still generating meaningful returns that partially offset inflation during normal times.
MMAs also play an important role in cash management for high-income earners who maintain larger liquidity buffers. Business owners, freelancers, and commission-based workers often keep 6–12 months of expenses as a cash reserve. At $50,000 held at 4.8% APY, a money market account generates $2,400 annually — a passive return that compounds while protecting operating capital. This is meaningful supplemental income that requires only the discipline to choose the right institution.
The rate-comparison use case for the MMA calculator is particularly valuable. Running the calculator with the rate offered by your current bank versus the top rates available at online institutions shows the dollar cost of inertia — and makes switching from a legacy bank to a higher-yield online account a financially quantified decision rather than a vague intuition.
These scenarios show how MMA calculations translate into real dollars across different use cases.
Sarah holds her $15,000 emergency fund for 3 years. At her traditional bank (0.5% APY): ending balance = $15,226, interest earned = $226. At a top online bank (4.8% APY): ending balance = $17,331, interest earned = $2,331. The rate difference earns Sarah an additional $2,105 on the exact same money over 3 years — enough to cover several months of a utility bill or a minor car repair. The only cost: opening a new account online (15 minutes).
A small business owner deposits $75,000 in an MMA at 4.5% APY and adds $2,000/month from operating profits. After 18 months: ending balance = $75,000 × (1.00375)^18 + $2,000 × [(1.00375)^18 - 1] / 0.00375 = $80,567 + $37,432 = $117,999. The business accumulated nearly $118,000 — including $5,999 in interest — while maintaining full liquidity for payroll, taxes, and operational expenses. The interest alone covered several months of utility bills.
Tom saves for a $40,000 down payment by contributing $1,000/month to an MMA at 4.8% APY starting with $5,000. How long does it take? After 33 months his balance exceeds $40,000 (with interest). Without interest (simple math: ($40,000 - $5,000) / $1,000 = 35 months), interest shaved 2 months off the timeline. While modest for short terms, the $1,200+ in interest earned reduces the effective amount he needed to contribute from his paycheck, freeing cash for moving expenses.
Staying with your existing bank out of inertia
The average traditional bank MMA pays 0.10–0.50% APY while online banks pay 4–5%+. On a $20,000 emergency fund over 2 years, that difference is over $1,700 in foregone interest. Switching takes 15 minutes online. The most expensive MMA mistake is staying with a suboptimal institution simply because changing accounts feels like effort.
Ignoring the impact of monthly fees
A $10/month maintenance fee on a $5,000 balance earning 4.5% APY ($18.75/month interest) reduces net interest to $8.75/month — an effective APY of only 2.1%. Always calculate net yield: subtract annual fees from annual interest earned and divide by average balance. Many online banks charge no maintenance fees, making them superior on a net-yield basis even if the nominal APY is slightly lower.
Confusing money market accounts with money market funds
Money market accounts are FDIC-insured bank deposits — your principal is safe. Money market funds are investment products that are not FDIC insured and can, in theory, “break the buck” (lose value below $1/share). Mixing these up can lead to taking unintended risk with funds that should be safe, or conversely, avoiding money market funds in a brokerage account where they are appropriate for cash holdings.
Exceeding the withdrawal limit and incurring fees
Many banks still enforce limits on convenient withdrawals (typically 6/month) even though Regulation D no longer requires it. Using your MMA debit card for everyday spending can quickly exceed this limit, triggering $10–$15 per-transaction fees that offset months of interest. Keep a checking account for daily spending and use the MMA exclusively for savings, with deliberate transfers when needed.
Not monitoring rate changes
MMA rates are variable and change with Fed policy. An account paying 5.0% today may pay 3.5% in 12 months after rate cuts. Many account holders set up their MMA and never revisit the rate. Check your rate quarterly against current market rates. If your institution has fallen significantly behind, it may be time to transfer funds to a higher-paying account — a process that takes minutes via ACH transfer.
Keeping too much in an MMA and too little invested
While MMAs are ideal for emergency funds and short-term goals, holding excess long-term savings in an MMA at 4–5% rather than investing in equities at an expected 7–10% represents a significant opportunity cost over decades. Quantify your true liquidity needs (emergency fund + near-term goals), then invest the remainder. Every dollar over-parked in cash is a dollar not compounding in the market over your long investing horizon.
Failing to consider FDIC limits for large balances
FDIC insurance covers $250,000 per depositor per institution. A couple with $400,000 in a single institution under one name has $150,000 uninsured. Solutions: spread funds across multiple institutions; use different ownership categories (individual, joint, IRA each get $250,000 separately); or consider T-bills for amounts above the FDIC threshold, which are backed by the U.S. government directly and carry effectively zero credit risk.
For balances above the $250,000 FDIC limit or for investors seeking maximum yield on cash, U.S. Treasury bills (T-bills) are a compelling alternative to MMAs. T-bills are backed by the full faith and credit of the U.S. government (zero credit risk), currently yield competitively, and interest is exempt from state and local taxes — a meaningful advantage in high-tax states. The trade-off is less liquidity (T-bills have fixed maturities of 4, 8, 13, 17, 26, or 52 weeks) and no FDIC insurance (though government backing is considered equivalent or superior).
Interest income from a money market account is taxed as ordinary income — the highest rate for most investors. In contrast, long-term capital gains and qualified dividends are taxed at lower preferential rates. High-income investors should consider holding emergency funds in an MMA within a traditional IRA (deferring tax until retirement) or holding cash equivalents in a Roth IRA (tax-free growth). Consult a tax advisor for personalized guidance, as contribution limits and eligibility rules apply.
When the yield curve is favorable (longer-term rates above MMA rates), a CD ladder can capture higher yields while preserving liquidity. For example: allocate 33% to a 6-month CD, 33% to a 12-month CD, and 33% to an MMA. As each CD matures, reinvest or spend as needed. This approach typically earns more than an MMA alone while maintaining meaningful access to funds every 6 months. Use the MMA calculator alongside a CD calculator to compare the total yield of each strategy.
Money market funds available in brokerage accounts (such as Vanguard's Federal Money Market Fund or Fidelity Government Money Market) often yield slightly more than bank MMAs and allow seamless allocation to investments without ACH transfer delays. They are not FDIC insured but invest in government securities with effectively zero default risk. For investors already holding brokerage accounts, a money market fund is a convenient, competitive cash alternative worth calculating alongside bank MMA returns.
A 4.8% APY MMA sounds excellent compared to the 0.10% offered a few years ago, but the question that matters for preserving wealth is whether the MMA yield exceeds the current inflation rate. When the Consumer Price Index is running at 3.5%, a 4.8% APY MMA produces a real (inflation-adjusted) return of approximately 1.3% — positive, but modest. When inflation was running at 7–9% in 2022, even a 5% MMA was producing deeply negative real returns. Understanding the real yield — nominal APY minus current CPI — is the correct benchmark for evaluating whether your MMA is actually protecting the purchasing power of your cash reserves.
The implication is that a money market account is not a wealth-building vehicle in periods of high inflation — it is a wealth-preservation vehicle that limits the rate of purchasing power loss. True wealth building for long-horizon goals requires assets with expected real returns above inflation: equities, real estate, or inflation-linked bonds (TIPS). The MMA's role is specifically for the portion of your portfolio where capital preservation and liquidity take priority over real return: emergency funds, near-term savings goals, and operational cash reserves that cannot absorb market risk.
The most underutilized feature of a money market account is the automatic transfer. Setting up a recurring ACH transfer from your checking account to your MMA — even $100 or $200 per month — converts the account from a passive holding vehicle into an active savings engine. The MMA calculator quantifies exactly how much this matters: a $10,000 starting balance at 4.8% APY with no contributions grows to $11,511 in 3 years. The same account with $300/month contributions grows to $23,213 — an ending balance more than double. The contributions, not just the interest, are the primary driver of balance growth in shorter time horizons.
Automatic deposits also remove the behavioral friction that leads most people to under-save. Savings that require a deliberate monthly decision are far less reliable than savings that happen automatically before you can see the money in your checking account. Many online bank MMAs allow you to set up multiple recurring transfers with different amounts and frequencies, enabling you to allocate a portion of every paycheck, every freelance payment, or every quarterly bonus to the account with no ongoing effort. This consistency — not the APY — is the largest determinant of MMA balance growth for most savers.
Pair the MMA calculator with these tools to optimize your cash management and overall savings strategy.
Compound Interest Calculator
Project compound growth on any deposit with any compounding frequency.
Savings Calculator
Model how regular deposits grow with compound interest in any savings vehicle.
APY Calculator
Convert between APR and APY to accurately compare financial product yields.
How Long to Save Calculator
Find out when your MMA balance will reach your savings goal amount.
Savings Goal Calculator
Calculate the monthly contribution needed to hit a savings target by a date.
Future Value Calculator
Project any lump sum or recurring contribution forward to a future date.
Inflation Calculator
See whether your MMA APY is keeping pace with current inflation rates.
Retirement Calculator
Build a complete retirement projection that accounts for cash and investments.
Net Worth Calculator
Track your total assets including cash, investments, and real estate.
Investment Return Calculator
Compare MMA returns against equity investment returns over any time period.
Use these benchmarks to evaluate any money market account offer and understand whether it meets the standard for a competitive, fee-efficient savings vehicle.
A money market account (MMA) is a federally insured deposit account offered by banks and credit unions that typically pays higher interest than a standard savings account. MMAs combine features of both savings and checking accounts: they earn compound interest on deposited funds, are FDIC-insured up to $250,000 per depositor per institution, and often come with check-writing and debit card privileges. They require higher minimum balances than regular savings accounts — typically $1,000 to $10,000 — to earn the advertised APY.
A money market account calculator takes your starting balance, additional monthly contributions, annual percentage yield (APY), and time period, then projects the future account balance. It applies monthly compounding: each month, the balance is multiplied by (1 + APY/12), and any contribution is added. The output shows total interest earned and the final balance, helping you compare money market accounts and evaluate whether the yield meets your savings goals.
APY (Annual Percentage Yield) reflects the actual annual return including compounding — it is the effective rate you earn. APR (Annual Percentage Rate) is the nominal rate before compounding. For a money market account compounded monthly, APY = (1 + APR/12)^12 - 1. If APR is 4.80%, APY is approximately 4.91%. Banks are required by Regulation DD to advertise APY, which makes comparison straightforward. Always compare accounts using APY to see the true return.
Yes. Money market accounts at FDIC-member banks are insured up to $250,000 per depositor, per institution, per ownership category. Credit union money market accounts are insured by the NCUA (National Credit Union Administration) under the same limits. This insurance protects your principal and interest if the institution fails. If you have more than $250,000 to deposit, spread it across multiple institutions or ownership categories (individual, joint, IRA) to maintain full coverage.
As of mid-2026, competitive money market account APYs range from 4.0% to 5.2% at online banks and credit unions. Traditional brick-and-mortar banks typically offer lower rates (0.10–0.50%). The national average MMA rate is around 0.66% APY, significantly below what top online institutions offer. A good MMA APY is one that matches or exceeds current high-yield savings account rates — shop broadly and compare, as rates change with Federal Reserve policy.
Most money market accounts compound interest daily and credit it monthly. Daily compounding means interest is calculated on your balance every day, and that interest is added to the principal each month, which then earns interest the next day. The formula for daily compounding over a year is: FV = PV × (1 + APR/365)^365. In practice, daily vs. monthly compounding on the same APY produces nearly identical results, and the quoted APY already accounts for the compounding frequency.
Minimum balances vary widely by institution: some online money market accounts have no minimum balance requirement; traditional banks often require $1,000 to $10,000 to open and/or to avoid monthly fees. Some tiered MMAs pay a higher APY on balances above a threshold (e.g., higher rate above $10,000). Always read the fee schedule: monthly maintenance fees of $10–$25 can eliminate interest earnings on low balances, effectively making the account negative-return if you fall below the minimum.
The Federal Reserve's Regulation D historically limited savings and money market accounts to 6 convenient withdrawals per month. In 2020, the Fed suspended this limit, but many banks continue to enforce their own limits. Check your specific institution's policy. Exceeding the limit may result in fees, account conversion to a checking account, or account closure. For accounts used as emergency funds, infrequent access is typically fine within any institution-imposed limits.
A money market account (MMA) is a bank deposit account — FDIC insured, not investable in securities, guaranteed principal. A money market fund (MMF) is a mutual fund that invests in short-term, high-quality debt instruments like Treasury bills and commercial paper. MMFs are not FDIC insured; they aim to maintain a $1.00 net asset value (NAV) but can theoretically break the buck in extreme scenarios. MMFs may offer slightly higher yields than bank MMAs and are typically held at a brokerage account.
MMAs and high-yield savings accounts (HYSAs) are very similar products. Both are FDIC insured, offer competitive APYs, and compound interest. Key differences: MMAs often offer check-writing and debit card access, making them more flexible for spending. HYSAs may have no minimum balance and often offer the same or higher APY at online banks. For pure savings, either is appropriate. If you need occasional check-writing for large expenses (rent, insurance), an MMA's added access is valuable. Compare specific rates and fees at the time of opening.
You cannot lose your principal in an FDIC-insured money market account at a bank (up to $250,000). The risk is different from bank failure: if the account charges fees that exceed interest earned — for example, a $10/month maintenance fee on a $500 balance at 4% APY — the net result can be a loss. Always verify that interest earned exceeds any fees. If your balance falls below the minimum required for the promotional APY, you may earn a significantly lower rate.
Monthly interest depends on your balance and APY. For a $10,000 balance at 4.5% APY: monthly interest = $10,000 × (4.5% / 12) = $37.50. At $50,000 balance: $187.50/month. At $100,000: $375/month. These are approximate; the exact amount depends on whether interest is calculated daily or monthly and how compounding is applied. As interest accrues, it adds to the principal, which earns slightly more the following month — the essence of compound interest.
Compare MMAs using APY (not APR), minimum balance requirements, monthly fees, withdrawal limits, and deposit insurance. Use aggregator sites like Bankrate, NerdWallet, or DepositAccounts.com to see current rates across hundreds of institutions. Focus on the net yield after fees: a 5.0% APY with a $10 monthly fee on a $10,000 balance produces a net APY of roughly 3.8%. Online banks consistently offer higher rates than traditional banks due to lower overhead costs.
Tiered money market accounts pay different APYs based on your balance level. For example: 3.5% APY on balances up to $9,999; 4.5% APY on $10,000–$49,999; 5.0% APY on $50,000+. Only the portion in each tier earns that tier's rate (in most cases). When using our calculator with a tiered MMA, use the effective blended rate for your balance level to get an accurate projection. Tiered accounts incentivize larger deposits but can mislead if you assume the top tier rate applies to your entire balance.
A money market account is an excellent emergency fund vehicle. It provides FDIC-insured safety, earns competitive interest to offset inflation, and offers reasonable liquidity via check-writing or debit card. The main consideration is withdrawal limits — emergency funds should be accessible quickly, and most MMAs allow this. Keep 3–6 months of expenses in an MMA as your primary emergency fund, with a portion in a linked checking account for immediate access if a same-day emergency arises.
To maximize MMA earnings: (1) Choose the highest APY account available — shop online banks that consistently offer 1–2% more than traditional banks; (2) Maintain the minimum balance to avoid fees and qualify for top-tier rates; (3) Consolidate multiple small accounts into one larger balance to qualify for higher tiers; (4) Set up automatic deposits to build the balance over time; (5) Re-evaluate your rate every 6 months — institutions frequently change rates, and it may be worth switching to a better-paying account.
Money market account rates are closely linked to the Federal Reserve's federal funds rate. When the Fed raises rates (as in 2022–2023), MMA APYs rise quickly at competitive online banks. When the Fed cuts rates (as in 2024–2025), MMA rates decline. Traditional banks are slower to pass rate changes to depositors than online banks. This means the best time to lock in higher rates is when the Fed begins cutting — consider a short-term CD at that point to preserve a higher yield before MMA rates fall.
Yes. Interest earned in a money market account is considered ordinary income by the IRS and is fully taxable at your marginal tax rate in the year it is earned, even if you do not withdraw it. You will receive a Form 1099-INT from your bank for any year in which you earn more than $10 in interest. If you are in the 22% bracket, a 4.5% nominal MMA rate has an after-tax effective yield of approximately 3.51%. Consider tax-advantaged accounts (HSA, IRA) for long-term savings to eliminate this tax drag.
A certificate of deposit (CD) locks your money for a fixed term (3 months to 5 years) in exchange for a guaranteed rate. A money market account is liquid — you can access funds at any time (within withdrawal limits). CDs typically offer slightly higher rates than MMAs for the equivalent term because of the lock-up. Use a CD for money you will not need for a defined period; use an MMA for funds that need to remain accessible. A CD ladder combines both: regular liquidity and higher guaranteed yields.
Yes. There is no regulatory limit on the number of money market accounts you can open. Multiple accounts at different institutions also increase your FDIC coverage: each institution insures up to $250,000 per depositor per ownership category, so two institutions cover up to $500,000. Multiple accounts can serve different savings goals, allow you to take advantage of the best rate at each institution, and create natural separation between emergency funds and other goal-based savings.
Online banks and credit unions typically adjust MMA rates within days of a Fed rate decision — sometimes within 24 hours. Traditional banks are slower, often taking weeks or months. In the 2022–2023 rate-hiking cycle, top online MMAs went from near 0% to 5%+ within 18 months. In 2024–2025 cutting cycles, rates began declining almost immediately at competitive institutions. Monitor your MMA rate monthly and compare to current top rates — if your account falls 0.5%+ behind the market, it may be worth switching.
Yes, money market accounts are ideal for short-term savings goals (6 months to 3 years). They offer FDIC-insured principal, competitive APYs that currently outpace inflation for the first time in years, and liquidity. Unlike CDs, there is no penalty for early access. For goals under 6 months, a regular HYSA works equally well. For goals over 3 years, consider shifting a portion to investment accounts for potentially higher real returns, accepting more volatility in exchange.
If your bank fails, the FDIC steps in — typically within days — to either transfer your account to an acquiring institution or pay out your insured balance directly. FDIC insurance covers principal plus any accrued interest up to $250,000 per depositor per institution. You will have full access to your insured funds with minimal disruption. Amounts above $250,000 at a single institution are uninsured and subject to loss if the bank fails and cannot cover its liabilities. Always keep balances within insured limits.
Opening a money market account typically takes 10–15 minutes online. You will need a government-issued ID, Social Security number, current address, and a funding source (checking account for an ACH transfer or credit card for initial deposit at some institutions). Most online banks have no opening fees. After approval, fund the account to meet any minimum balance requirements. Set up automatic monthly transfers from your checking account to build the balance consistently and automate your savings plan.
Money market accounts typically offer higher interest rates than standard savings accounts (but similar to HYSAs), usually require higher minimum balances, and often include check-writing or debit card privileges that regular savings accounts lack. Standard savings accounts have lower minimum balance requirements and fewer features. High-yield savings accounts offered by online banks now often match or exceed MMA rates without the minimum balance requirements, making HYSAs competitive alternatives for pure savings without spending access.
Yes. Business money market accounts are widely available and offer the same interest-earning benefits as personal MMAs. They are suitable for holding business emergency reserves, tax payment funds, payroll buffers, and operating cash beyond what is needed immediately. Business MMA rates may differ from personal rates — compare specifically. FDIC coverage for business accounts is $250,000 per depositor per institution, same as personal accounts. Keeping business and personal funds separated also simplifies accounting and tax preparation.
Common MMA fees include: monthly maintenance fees ($5–$25, often waived above a minimum balance); excessive transaction fees (charged when you exceed the monthly withdrawal limit, typically $5–$15 per transaction); paper statement fees; wire transfer fees; and minimum balance penalty fees (a lower rate or flat fee applied if balance falls below the required minimum). Read the full fee schedule before opening any account and confirm that your expected balance will avoid all fees to maximize net yield.
A jumbo money market account is an MMA requiring a larger minimum deposit — typically $100,000 or more — in exchange for a higher APY than standard tiers. Jumbo accounts are marketed to high-net-worth individuals, businesses, and institutions that hold large cash reserves. Not all jumbo accounts offer meaningfully higher rates than standard competitive MMAs at online banks; compare carefully. For very large balances, also consider T-bill ladders or money market funds as alternatives, which may offer similar yields with different risk profiles.
The calculator lets you enter the APY and minimum balance of two or more accounts and project the future balance for each over your savings horizon. For example, comparing a 2.5% traditional bank MMA vs. a 4.8% online MMA with a $10,000 balance over 3 years: the traditional account grows to $10,769; the online account grows to $11,512 — a $743 difference on the same principal. The calculator makes this comparison concrete, motivating you to optimize your account choice.
A common framework: keep 3–6 months of expenses in a liquid MMA as your emergency fund; keep any specific short-term savings goals (under 3 years) in the MMA as well; invest everything else in a diversified portfolio of index funds for long-term growth. Holding excess cash in an MMA beyond your emergency fund and near-term goals is a conservative drag on long-term wealth, since MMA rates (4–5%) typically trail long-run equity returns (7–10%). Use the calculator to size your MMA appropriately.
Credit union money market accounts (sometimes called share draft accounts) are NCUA-insured (equivalent to FDIC) and often offer comparable or slightly better rates than traditional banks. Credit unions are member-owned nonprofits, which sometimes allows them to return profits through higher deposit rates and lower loan rates. Online banks and online credit unions typically lead the market in MMA APYs. The best approach is to compare specific current rates at both banks and credit unions using a rate aggregator rather than assuming one type is universally better.
Calculation method: This calculator uses monthly compounding applied to the APY entered. Each month, the running balance is multiplied by (1 + APY/12) and the monthly contribution is added. The formula assumes contributions are made at the end of each period. If a monthly fee is entered, it is deducted after interest is applied each month. Results represent the account balance at the end of each month over the selected time horizon.
Disclaimer: This calculator is for educational and illustrative purposes only. APY rates are variable and will change with Federal Reserve policy and each institution's decisions. Results shown are projections, not guarantees. FDIC insurance information is general guidance — confirm coverage details with your specific institution. Always consult a qualified financial advisor. Last updated: June 2026. Maintained by Financial Growth Hub.
Share your thoughts
Help us improve The Free Calculator Site