MAV is the amount you owe in federal income tax for the current year, paid in four installments instead of one lump sum at tax time

MAV stands for "Mathematically Allowable Value" and appears on your Form 1040-ES (Estimated Tax Worksheet) as the total federal income tax you are expected to owe for the year. The IRS divides this into four quarterly payments — due April 15, June 15, September 15, and January 15 of the following year — so you do not have to pay everything on December 31 or April 15.

You calculate MAV by estimating your total income for the year, subtracting deductions and credits, and multiplying by the tax rate that applies to your income bracket. The result is what you owe in federal tax. The IRS then divides that total into four equal (or nearly equal) quarterly amounts, and that is your MAV estimated payment for each quarter.

Most people who receive a W-2 from an employer do not need to worry about MAV because their employer withholds federal tax from each paycheck. You only calculate and pay MAV if you are self-employed, a freelancer, have investment income, receive rental income, or have other income sources where no tax is withheld automatically.

Key Takeaways

  • MAV is the total federal income tax you expect to owe for the year, divided into four quarterly payments.
  • You only pay estimated tax (MAV) if you have income with no automatic withholding, such as self-employment income, rental income, or investment gains.
  • The four payment due dates are April 15, June 15, September 15, and January 15, and missing a payment can result in penalties and interest.
  • You calculate MAV using Form 1040-ES, which walks you through estimating your income, deductions, and tax liability for the year.
  • If your actual tax liability at year-end differs from your MAV payments, you will either owe additional tax or receive a refund when you file your return.

How to calculate your MAV estimated payment

Start with Form 1040-ES, which the IRS publishes each year and includes a worksheet. You do not file this form; it is a calculation tool only. The worksheet asks you to estimate your total income for the year from all sources — wages, self-employment, rental income, capital gains, interest, dividends, and any other taxable income.

Next, subtract your expected deductions. If you take the standard deduction, use that figure. If you itemize, estimate your itemized deductions for the year. Then subtract any tax credits you expect to claim, such as the Earned Income Tax Credit or Child Tax Credit. The number you arrive at is your estimated tax liability — this is your MAV.

Divide that total by four to find your quarterly payment amount. The IRS allows you to pay unequal amounts across the four quarters if your income is uneven (for example, if you earn most of your income in the fall), but most people pay the same amount each quarter for simplicity.

If you underpay or overpay, you will settle the difference when you file your tax return. Underpayment can trigger a penalty and interest, though the IRS waives the penalty if your total withholding and estimated payments equal at least 90 percent of your current year tax or 100 percent of your prior year tax (110 percent if your prior year adjusted gross income was over $150,000).

Who must pay estimated tax and when

You must pay estimated tax if you expect to owe $1,000 or more in federal tax after subtracting your withholding and any tax credits. This applies to self-employed people, business owners, freelancers, investors, and anyone else with income that is not subject to employer withholding.

The four quarterly due dates are April 15, June 15, September 15, and January 15. If a due date falls on a weekend or federal holiday, the deadline moves to the next business day. You can pay online through IRS Direct Pay, by phone, by mail, or through an authorized payment processor. The IRS website (irs.gov) lists all payment methods.

If you miss a payment deadline, pay as soon as you can. The IRS charges interest on unpaid tax starting from the due date, and it may also assess an underpayment penalty. The longer you wait, the more interest and penalties accumulate, so do not ignore a missed payment.

The difference between MAV and actual tax owed

MAV is an estimate based on what you think you will earn and owe. Your actual tax liability, calculated when you file your return, may be higher or lower. If you earned less than expected, had larger deductions than you estimated, or claimed credits you did not anticipate, your actual tax may be less than your MAV payments. In that case, you will receive a refund.

If you earned more than expected or had fewer deductions, your actual tax may exceed your MAV payments. You will owe the difference when you file. This is why it is important to adjust your estimated payments if your income changes significantly during the year — you can file an amended Form 1040-ES and change your quarterly payment amount for the remaining quarters.

Some people intentionally overpay their estimated tax to build a refund, treating it as a forced savings plan. Others try to pay as close to their actual liability as possible to avoid giving the IRS an interest-free loan. Both approaches are legal; the choice depends on your preference.

What happens if you underpay or miss a payment

The IRS charges interest on any unpaid tax from the due date forward. The interest rate changes quarterly and is currently in the range of 8 to 9 percent per year, though this varies. You also face an underpayment penalty if your total payments fall short of the safe harbor threshold — 90 percent of your current year tax or 100 percent of your prior year tax.

The penalty is calculated based on how much you underpaid and for how long. If you underpaid by $500 for three months, the penalty is smaller than if you underpaid by $2,000 for nine months. The IRS calculates this automatically when you file your return; you do not have to request a penalty calculation.

If you cannot pay in full by the due date, pay what you can anyway. The IRS offers payment plans and can sometimes reduce or waive penalties if you have a reasonable cause for the underpayment. Contact the IRS or work with a tax professional to discuss your options.

Adjusting your MAV payments during the year

If your income changes significantly after you have already made estimated payments, you can adjust your remaining quarterly payments. For example, if you expected to earn $60,000 but by June you realize you will earn $80,000, you can recalculate your MAV using Form 1040-ES and increase your September and January payments.

Conversely, if your income drops or you discover you will have larger deductions than expected, you can reduce your remaining payments. This prevents you from overpaying and having to wait for a refund when you file your return.

You do not file an amended Form 1040-ES with the IRS; you simply adjust the amount you pay for the next quarter. Keep a record of your calculation in case the IRS asks about your estimated tax payments during an audit.

Frequently Asked Questions

What if I have a job and also do freelance work — do I still need to pay MAV?

Yes, if your freelance income is significant enough that your total federal tax liability (including tax withheld from your job) will exceed $1,000 for the year. Your employer withholds tax from your W-2 wages, but not from your freelance income, so you must pay estimated tax on the freelance portion. Use Form 1040-ES to calculate your total expected tax from both sources and subtract your expected withholding to find your MAV.

Can I pay my MAV all at once instead of in four quarterly payments?

Yes. You can pay your entire annual estimated tax in one lump sum, though most people pay quarterly to spread the burden. If you pay early — for example, paying your full year's MAV in April — the IRS will not charge you interest on the overpayment if your actual tax turns out to be lower. However, you will still owe interest on any underpayment if your actual tax is higher than you estimated.

What if I did not know I needed to pay estimated tax and missed the first two quarters?

Pay the missed amounts as soon as possible, even though you will owe interest and possibly a penalty. The longer you wait, the more interest accumulates. When you file your tax return, the IRS will calculate the exact penalty based on how much you underpaid and for how long. You can also contact the IRS to discuss whether you may have access to for penalty relief based on reasonable cause.

Does paying MAV mean I do not have to file a tax return?

No. Paying estimated tax does not replace filing a tax return. You must still file your Form 1040 (or other applicable return) by April 15 to report your actual income, deductions, and credits. Your MAV payments are credited against your final tax liability when you file, and you will either owe additional tax or receive a refund depending on whether you overpaid or underpaid.

How do I know if my MAV estimate is accurate?

You will not know for certain until you file your tax return and calculate your actual tax liability. However, you can check your estimate mid-year by reviewing your actual income and deductions so far and comparing them to your original estimate. If there is a significant gap, recalculate your MAV using Form 1040-ES and adjust your remaining quarterly payments. This helps you avoid a large bill or refund at tax time.