Quarterly Estimated Tax Calculator

Understanding Your Results

What this number means

This is the amount to send the IRS by the date shown. It is not necessarily what you will owe for the year. It is the amount that keeps you inside a safe harbor, which is the rule that protects you from an underpayment penalty.

Those two things come apart more often than people expect. You can pay every installment on time, in full, and still owe money in April. That is normal and it is not a penalty. It means your income went up.

Why it matters

The IRS charges a penalty on each underpaid installment for the number of days it stays unpaid. It is assessed period by period, not once at the end, and it applies even if you end up owed a refund when you file.

Overpaying has a cost too, just a quieter one. Money sent early is money you cannot use and is generally returned only after you file.

What affects it

• Your business profit. The single biggest lever, and the one that moves most during the year.
• Any W-2 withholding in your household. Withholding counts toward your target, including a spouse’s on a joint return. More withholding means smaller estimated payments.
• Your filing status. It changes your standard deduction and your tax brackets.
• Deductible business expenses. Legitimate deductible business expenses lower profit and can reduce both income tax and self-employment tax.
• Last year’s tax bill. If last year was a higher-income year, the prior-year safe harbor may not be the cheaper target. If last year was lower, it usually is.

What to do next

If the figure is above zero, schedule the payment before the date shown. IRS Direct Pay and EFTPS are both free and both give you a confirmation you can keep.

Re-run this before each remaining due date if your income has moved. A quarterly estimate built on January’s assumptions is stale by September.

If you left the prior-year fields blank, go find last year’s return. The prior-year target is often lower than the current-year one, and you cannot know which is smaller without both numbers.

Who has to make these payments

You generally owe estimated tax if you expect to owe at least $1,000 in federal tax after subtracting withholding and refundable credits.

Two things about that rule catch people out.

It is not a profit threshold. The test is on tax owed, not income earned. Self-employment tax alone can clear $1,000 on a fairly small side income, which means you can owe quarterly payments in a year when your income tax is zero. There is a worked example of exactly that below.

Withholding counts. If you have a day job, or a spouse who does, that withholding is applied against your target. Someone with $1,400 of total tax and $600 already withheld is under the threshold and owes nothing quarterly.

There is one clean exception. If you had no tax liability at all in the prior year, you were a U.S. citizen or resident alien for the whole year, and that year covered twelve full months, you do not have to make estimated payments.

Two taxes, not one

This is where most confusion starts. Your quarterly payment covers two separate taxes.

Income tax works the way it does for everyone. Your income is taxed in slices, each slice at its own rate.

Self-employment tax covers the Social Security and Medicare taxes that employees and employers normally split. When you work for someone else, your share comes out of your paycheck and your employer pays a matching share. When you work for yourself, you are both parties, so you pay both shares.

That is why self-employed tax bills feel heavier than the brackets suggest. It is not that your income tax is higher. It is that a second tax is sitting underneath it. If you are weighing contract work against a salaried offer, the 1099 vs W-2 calculator puts the two side by side.

The 92.35% adjustment

Self-employment tax is not calculated on your full profit. It is calculated on 92.35% of it.

The reason is fairness, not a loophole. An employee’s payroll tax is figured on their wages, and the employer’s matching share is not counted as part of those wages. Multiplying by 92.35% removes the equivalent slice from a self-employed person’s profit, so both end up taxed on a comparable base.

There is a floor. If that adjusted figure comes to less than $400, no self-employment tax is due at all.

Why you also get a deduction for half of it

After you calculate self-employment tax, you deduct half of it from your income before figuring income tax.

Same logic again. An employer deducts its share of payroll tax as a business expense. You are your own employer, so you get the same deduction. It reduces your income tax, not your self-employment tax.

If you want the annual self-employment tax figure on its own, without the quarterly split, the self-employed tax estimator covers that calculation.

Safe harbor: the rule worth understanding

A safe harbor is a payment target that protects you from the underpayment penalty when the required amount is paid through timely installments or withholding.

There are two, and you only need to hit the smaller one:

• 90% of your current-year tax. Requires estimating this year accurately.
• 100% of your prior-year tax. A fixed number off last year’s return, which is why most people prefer it. If your prior-year income was above a set threshold, this rises to 110%.

The prior-year option is the more useful of the two for one simple reason: it is already known. You are not guessing. You take a number off a filed return, divide it by four, and pay that.

Meet it through timely payments or withholding and the penalty generally does not apply, even if your final tax bill is higher.

Safe harbor prevents the penalty. It does not reduce the tax. If you pay a safe-harbor amount based on a $16,000 prior-year bill and your income doubles, you still owe the difference in April. You just owe it without a penalty on top. This is the single most misunderstood thing about estimated taxes and it is worth reading twice.

The four due dates and the figures that change each year

This section contains values that change annually. It is reviewed before each tax year. Everything above this point stays accurate regardless.

Due dates for the 2026 tax year:

The periods are not quarters. Look at the second column. The first covers three months, the second covers two, the third covers three, and the fourth covers four. They are called quarterly payments but the periods behind them are uneven, which is why a payment can feel mistimed relative to when you actually earned the money.

If a due date lands on a weekend or a legal holiday, it moves to the next business day.

There is a shortcut on the last one. You can skip the January payment if you file your return by February 1 and pay the full balance with it.

Figures for the 2026 tax year:

The Social Security portion stops once your combined wages and net self-employment earnings reach the wage base. The Medicare portion has no ceiling.

Income tax brackets for 2026:

Single

Married filing jointly

Head of household

Married filing separately

The business income deduction

Most self-employed people can deduct 20% of their business profit before income tax is calculated. It is a straight reduction in taxable income and it makes a real difference to the final number.

Below an income threshold the rule is simple: 20% of qualified business income, capped at 20% of your taxable income before this deduction. Above the threshold it becomes considerably more complicated, involving limits tied to wages you pay and property you own, and certain service businesses lose it entirely. This calculator handles the straightforward case and tells you when you are above the line rather than guessing.

Two rules apply for the 2026 tax year that did not exist before. You need at least $1,000 of qualified business income to claim anything, and if you qualify, the minimum deduction is $400. The income thresholds where the complicated rules begin are $201,750 for single and head of household filers, $201,775 for married filing separately, and $403,500 for married filing jointly.

Example one: a freelancer with no other income

Dana is single, freelances full time, and expects $90,000 of profit this year. Last year she owed $16,000 in total tax on an AGI of $85,000. She has no W-2 job and no withholding.

Step 1. Adjust profit for self-employment tax.

$90,000 x 92.35% = $83,115.00

Step 2. Calculate self-employment tax.

Social Security: $83,115.00 x 12.4% = $10,306.26

Medicare: $83,115.00 x 2.9% = $2,410.34

Total: $12,716.60

Her earnings are below the Social Security wage base, so the whole amount is subject to both parts.

Step 3. Deduct half of it.

$12,716.60 divided by 2 = $6,358.30

Step 4. Find adjusted gross income.

$90,000 minus $6,358.30 = $83,641.70

Step 5. Subtract the standard deduction.

$83,641.70 minus $16,100 = $67,541.70

Step 6. Apply the business income deduction.

20% of her qualified business income: 20% x $83,641.70 = $16,728.34

Capped at 20% of the figure from step 5: 20% x $67,541.70 = $13,508.34

She takes the smaller: $13,508.34

Step 7. Taxable income.

$67,541.70 minus $13,508.34 = $54,033.36

Step 8. Income tax, bracket by bracket.

Step 9. Total tax for the year.

$6,599.34 income tax plus $12,716.60 self-employment tax = $19,315.93

Step 10. Compare the two safe harbors.

Current-year target: 90% x $19,315.93 = $17,384.34

Prior-year target: 100% x $16,000 = $16,000.00

Her prior-year AGI was below the $150,000 threshold, so the 100% figure applies rather than 110%. She takes the smaller of the two.

Required for the year: $16,000.00. Each payment: $4,000.00.

Notice what happened. Dana pays $16,000 across the year against a $19,315.93 bill. She will owe roughly $3,300 more when she files, generally without an underpayment penalty, provided each required installment was paid on time. The prior-year rule is doing real work for her here.

Example two: a household with a job and a side business

Marcus and Priya file jointly. Priya earns $120,000 from a salaried job with $14,000 withheld. Marcus expects $60,000 of profit from his consultancy. Last year they owed $22,000 on an AGI of $175,000.

Step 1. Adjust Marcus’s profit.

$60,000 x 92.35% = $55,410.00

Step 2. Self-employment tax, watching the wage base.

Priya’s $120,000 salary has already used part of the Social Security wage base. The base is $184,500, so $64,500 of room remains. Marcus’s $55,410 fits inside it.

Social Security: $55,410.00 x 12.4% = $6,870.84

Medicare: $55,410.00 x 2.9% = $1,606.89

Total: $8,477.73

Step 3. Deduct half.

$8,477.73 divided by 2 = $4,238.87

Step 4. Adjusted gross income.

$120,000 plus $60,000 minus $4,238.87 = $175,761.14

Step 5. Subtract the standard deduction.

$175,761.14 minus $32,200 = $143,561.14

Step 6. Business income deduction.

20% x $55,761.13 of qualified business income = $11,152.23

Capped at 20% x $143,561.14 = $28,712.23

The uncapped figure is smaller, so: $11,152.23

Step 7. Taxable income.

$143,561.14 minus $11,152.23 = $132,408.91

Step 8. Income tax.

Step 9. Total tax.

$18,553.96 plus $8,477.73 = $27,031.69

Step 10. Safe harbors, with the higher-income rule.

Current-year target: 90% x $27,031.69 = $24,328.52

Prior-year target: their prior-year AGI of $175,000 was above $150,000, so the multiplier is 110%. 110% x $22,000 = $24,200.00

Smaller: $24,200.00

Step 11. Subtract withholding.

Priya’s $14,000 counts toward the household target.

$24,200.00 minus $14,000 = $10,200.00

Each payment: $2,550.00.

Two things worth noticing. Priya’s withholding cut the estimated payments by more than half, which is why the calculator asks about household wages rather than just business income. And the two safe harbors landed within $130 of each other, so checking both was worth doing.

Which safe harbor should you actually use

The practical answer for most people is the prior-year rule. It is based on a filed return rather than a forecast, which generally makes it easier to calculate reliably, and it lets you set up four identical payments and stop thinking about it.

The exception is a year you know will be worse than the last. If your income has genuinely dropped, paying 100% or 110% of a big prior-year bill means handing over money you will get back months later. That is the case for forecasting the current year instead, and accepting that you have to forecast it honestly.

You do not have to pick in advance. Calculate both, use whichever is smaller, and re-check as the year develops.

Three situations that change the answer

Your income jumped. Nothing breaks. Keep paying the prior-year safe-harbor amount on time and the penalty generally does not apply, no matter how far your actual tax exceeds it. You will owe the difference at filing. The mistake is panicking and overpaying quarterly when you could hold that money until April instead. If your profit has grown to the point where entity structure is worth revisiting, the LLC vs S-Corp tax savings calculator shows roughly where the crossover sits.

Your income dropped sharply. The prior-year rule is now expensive, because it is anchored to a year that no longer reflects you. Switch to the current-year target, but forecast it properly. If you aim at 90% of this year and this year turns out better than you thought, you have missed the safe harbor and the penalty applies to the shortfall.

It is your first year self-employed. You may have no prior-year figure to use, or a prior year covering less than twelve months, which does not qualify. That leaves the current-year target and a forecast built on very little. Estimate conservatively and revise every quarter. If you had no tax liability at all last year and met the other conditions, you may owe no estimated payments this year regardless.

When your income arrives unevenly

The standard method assumes your income is spread evenly across the year. Plenty of self-employed work is not. A consultant who bills nothing until a project closes in November has a real problem: the standard method wants equal payments in April and June against income that has not arrived.

There is an official answer, called the annualized income installment method. It matches each period’s required payment to the income you actually received in that period, so a quiet first half means smaller early payments. You claim it by filing Form 2210 with Schedule AI attached to your return.

This calculator uses the standard method. If your income is genuinely lumpy, your required payments for the early periods may be lower than what is shown here. The figure on this page is safe, in that paying it will not leave you short. It may just be more than you strictly owe at that point in the year.

Catching up does not work the way you would hope

This is the trap worth understanding before you need it.

The penalty is assessed on each installment separately, for the number of days that installment stays underpaid. It is not a single year-end calculation.

So if you miss the April and June payments and then pay everything owed in September, you have not fixed April and June. Those two installments were still late, and the penalty on them still accrues from their due dates until the money arrives. Paying extra later does not reach backward.

What this means in practice: a missed installment is a cost you have already incurred. Pay it as soon as you can, because the penalty grows with time, but do not assume a big fourth payment cleans the slate.

One exception runs the other way, in your favour. Withholding is treated as paid evenly across the year no matter when it actually happened. If you have a W-2 job, increasing your withholding late in the year can retroactively cover earlier periods in a way that estimated payments cannot.

Common mistakes

Setting aside a flat percentage. The advice to save 25% or 30% of every invoice is a rule of thumb, not a calculation. It ignores your deductions, your filing status, your spouse’s withholding, and the business income deduction. It is usually wrong in one direction or the other, sometimes by thousands. If the underlying problem is that your rates are not high enough to absorb the tax, start with the freelancer hourly rate calculator instead of adjusting the percentage.

Forgetting self-employment tax exists. People look at the brackets, see 12%, and set aside 12%. The self-employment tax underneath is the larger number at moderate incomes.

Using 100% when 110% applies. If your prior-year income was above the threshold, the prior-year safe harbor is 110%, not 100%. Paying 100% means you missed the safe harbor entirely and the penalty applies to the whole shortfall. This one catches people in the year after a good year.

Assuming a refund means no penalty. It does not. The underpayment penalty is calculated on the timing of your payments, not on your year-end balance. You can be owed a refund and still be penalised for paying too little too late.

Not counting a spouse’s withholding. On a joint return, all household withholding counts toward the target. Ignoring it means overpaying, sometimes substantially.

Never revisiting the estimate. A number calculated in April on January’s assumptions is not a plan, it is a guess with a date on it. Re-run it before each due date.

Do I have to pay quarterly taxes if I only made a few thousand freelancing?

Possibly, yes. The test is whether you expect to owe $1,000 or more in tax after withholding and refundable credits, not how much you earned. Self-employment tax applies from $400 of adjusted net earnings and has no standard deduction shielding it, so a small side income can produce a tax bill above $1,000 even when your income tax is zero. Run your actual figures through the calculator above rather than assuming a small income is exempt.

Does my W-2 withholding count toward my estimated payments?

Yes, and so does your spouse’s on a joint return. Withholding is subtracted from your required annual payment, so the more that is withheld, the less you send quarterly. Withholding also gets better treatment than estimated payments: it is treated as paid evenly across the year regardless of when it actually happened. That makes increasing your withholding a useful tool if you are behind.

What happens if I overestimate and pay too much?

You get it back as a refund when you file, or you can apply it to next year’s first payment. There is no penalty for overpaying. The only cost is that the money sat with the IRS instead of with you. If a revised calculation shows that you are ahead of the required cumulative amount, you may be able to reduce or skip a later payment.

Can I pay monthly instead of quarterly?

Yes. The IRS cares that enough is paid by each period’s due date, not how many payments it took to get there. Paying monthly is a reasonable way to smooth cash flow, as long as the total paid by each deadline covers what was due for that period.

I missed the first two quarters. Can I just pay more now?

You can and you should, but it does not undo the miss. The penalty is calculated on each installment separately for the time it stays unpaid, so the April and June shortfalls keep accruing regardless of what you pay in September. Pay as soon as possible to stop the clock. If you also have a W-2 job, increasing your withholding for the rest of the year can help in a way that estimated payments cannot, because withholding is treated as spread evenly across the year.

What if my income is much higher in the second half of the year?

The standard method used here assumes even income and may require more in the early periods than you strictly owe. The annualized income installment method matches each payment to the income you actually received in that period, and you claim it by filing Form 2210 with Schedule AI. It is more work, and it is worth it if your income is genuinely concentrated later in the year.

Do these payments cover my state taxes too?

No. This calculator handles federal tax only. Most states with an income tax run their own estimated payment system, often with different deadlines and different rules for how much is due when. Check your state’s tax authority separately.

Why is my result different from a single filer’s with the same income?

Filing status changes both your standard deduction and your tax brackets, and head of household differs from single on both. A head of household filer gets a larger standard deduction and reaches the higher rates at different income levels, so the same profit produces a different tax. The calculator applies the correct table for the status you select.

Related Calculators

This is an estimate, not tax advice. This calculator produces a projection based on the figures you enter and the federal rules in effect for the tax year shown. It is not a substitute for Form 1040-ES, IRS Publication 505, or advice from a qualified tax professional who knows your situation.

What it assumes

• Full-year figures, with income treated as earned evenly across the year
• An individual filer, not a corporation
• Self-employment income from an active trade or business
• Withholding paid evenly across the year
• The standard deduction, unless you supply an itemized total

What it does not include

• The annualized income installment method, for income that arrives unevenly
• Business income deduction limits above the income threshold, where wage, property, and service-business rules apply
• State and local estimated taxes
• The special rules for farmers and fishermen
• Alternative minimum tax and net investment income tax
• Automatic calculation of credits, which you enter yourself
• Prior-year returns covering less than twelve months, which do not qualify for the prior-year safe harbor

Sources. Figures and rules on this page come from IRS Form 1040-ES and its Estimated Tax Worksheet, IRS Revenue Procedure 2025-32, IRS Publication 505, the IRS estimated taxes guidance, the Social Security Administration’s annual contribution and benefit base, and Internal Revenue Code sections 6654 and 199A.

Last reviewed: July 29, 2026

Next scheduled review: December 1, 2026