If you are self-employed and expect to owe $1,000 or more in tax after withholding and credits, the IRS generally requires you to pay estimated tax in four quarterly installments. Miss them, and you can owe an underpayment penalty — 7% annually in 2026 — even if you get a refund when you file.
This calculator uses the IRS safe-harbor method: pay 100% of last year's total tax (110% if your prior-year AGI exceeded $150,000), minus what you expect to have withheld, divided by four. Hit that number each quarter and you avoid the underpayment penalty, no matter what you earn this year. Enter your freelance profit, last year's total tax, and any expected withholding to get your quarterly payment instantly.
Key takeaways
- You generally must pay estimated tax if you expect to owe $1,000 or more after withholding and credits.
- Safe harbor: pay 100% of last year's total tax (110% if prior-year AGI exceeded $150,000) and you avoid the underpayment penalty regardless of this year's income.
- The 2026 quarterly deadlines are April 15, June 15, and September 15, 2026, plus January 15, 2027.
- The IRS underpayment penalty is 7% annually in 2026, applied separately to each quarter — a September overpayment cannot fix an April underpayment.
- Estimated payments are prepayments, not your tax return — you still file by the April deadline.
How it works
- Enter your expected annual freelance profit (after business expenses) to estimate self-employment tax.
- Enter your total tax from last year's return (Form 1040, line 24) and say whether your prior-year AGI exceeded $150,000 — that decides whether the safe harbor is 100% or 110% of last year's tax.
- Enter any W-2 withholding or other prepayments you expect this year; the calculator subtracts them from the safe-harbor total.
- The remainder is divided by four to give your quarterly payment — the amount the IRS safe-harbor rule says will keep you penalty-free.
- Pay each installment by the quarterly deadlines: April 15, June 15, and September 15, 2026, and January 15, 2027. Mark each deadline — the penalty is assessed per quarter.
Worked example
Example: You expect $80,000 of freelance profit this year. Last year your total tax (Form 1040, line 24) was $15,000, your AGI was under $150,000, and you expect no W-2 withholding.
Self-employment tax estimate: net earnings = $80,000 × 92.35% = $73,880. That is below the $184,500 Social Security cap, so the full 15.3% applies: $73,880 × 0.153 = $11,303.64.
Safe-harbor quarterly payment: safe harbor = 100% × $15,000 = $15,000 per year. Minus $0 withholding = $15,000 ÷ 4 = $3,750 per quarter. Pay $3,750 by each 2026 deadline and you avoid the underpayment penalty regardless of how much you actually earn this year.
If your prior-year AGI had exceeded $150,000, the safe harbor would be 110% × $15,000 = $16,500, or $4,125 per quarter.
Frequently asked questions
Who must pay quarterly estimated tax?
Individuals — including sole proprietors, partners, and S corporation shareholders — generally have to make estimated tax payments if they expect to owe $1,000 or more when their return is filed. If you are in business for yourself, the IRS says you generally need to make estimated tax payments, since nothing is withheld from your freelance income the way it is from a paycheck.
What are the 2026 quarterly estimated tax deadlines?
The 2026 estimated tax deadlines are April 15, 2026 (Q1), June 15, 2026 (Q2), September 15, 2026 (Q3), and January 15, 2027 (Q4). Note the odd spacing: the "quarters" are not equal — Q2 covers only two months. If a deadline falls on a weekend or holiday, payment is on time if made the next business day.
What happens if I miss a quarterly payment?
You may owe an underpayment penalty, and the penalty is assessed per payment period. Overpaying in September does not erase an April underpayment — each quarter stands on its own. For 2026 the penalty rate is 7% annually on the underpaid amount for each period. You can also owe a penalty if payments are late even when you are due a refund at filing time.
How do I actually pay estimated tax?
Pay free online through IRS Direct Pay or the Electronic Federal Tax Payment System (EFTPS), by phone, through the IRS2Go app, or via your IRS online account. You can also mail payment with the Form 1040-ES vouchers. You do not have to pay only four times a year — weekly or monthly payments are fine as long as enough is in by the end of each quarter.
What is the safe-harbor rule for avoiding the penalty?
Most taxpayers avoid the underpayment penalty if they pay at least 90% of this year's tax, or 100% of last year's total tax, whichever is smaller. This calculator uses the prior-year method because it needs no income-tax bracket math: just copy last year's total tax. Higher-income taxpayers — prior-year AGI above $150,000 ($75,000 if married filing separately) — must pay 110% of last year's tax instead.
My income is seasonal or uneven. Do I still pay four equal amounts?
You can pay equal quarterly installments for simplicity, but if most of your income arrives late in the year, equal payments can overpay early quarters. The IRS offers the annualized income installment method (Schedule AI of Form 2210), which matches payments to when income is actually earned and can reduce or eliminate the penalty. Keep records of when income arrived — you will need them if you use this method.
Do estimated payments replace filing my tax return?
No. Estimated payments are prepayments, like withholding from a paycheck. You still file your annual return (and owe any balance, or claim a refund) by the April filing deadline. Think of estimated tax as paying as you earn, and the return as the final reconciliation.
What if I overpay my estimated taxes?
Overpayments are credited on your return — you get them back as a refund, or you can elect to apply the overpayment to next year's estimated tax. Overpaying does not earn interest, so wildly overshooting just gives the IRS an interest-free loan; the safe-harbor target in this calculator is designed to keep you penalty-free without excess.
Do I need to pay estimated tax to my state too?
Most states with an income tax have their own estimated payment requirements, with their own deadlines and penalty rules — and they are separate from federal payments. This calculator covers federal tax only. Check your state's revenue department for its estimated tax forms and due dates.
This is my first year freelancing and I have no prior-year return. What do I use?
Without a prior-year return there is no prior-year tax figure for the safe harbor, so use the 90%-of-current-year-tax method instead: estimate this year's total tax with the Form 1040-ES worksheet and pay at least 90% of it in quarterly installments. Also note: if you had zero tax liability last year and meet the other IRS conditions, you may not have to pay estimated tax at all this year.
Sources
The short answer: what do I pay, and when?
If you are self-employed and expect to owe $1,000 or more in tax after withholding and credits, the IRS generally requires you to pay estimated tax in four quarterly installments during the year — not in one lump sum when you file. The 2026 deadlines are April 15, June 15, and September 15, 2026, and January 15, 2027.
The simplest way to set the amount is the safe-harbor rule: pay 100% of last year’s total tax (110% if your prior-year adjusted gross income exceeded $150,000), minus any withholding you expect this year, divided by four. Hit that quarterly number and you avoid the underpayment penalty — currently 7% annually in 2026 — regardless of how much you actually earn this year.
Enter your numbers in the calculator above and it gives you your quarterly payment in seconds. The rest of this page explains how the math works, when each payment is due, and what happens if you miss one.
Key takeaways
- You generally must pay estimated tax if you expect to owe $1,000 or more after withholding and credits. As a freelancer, no employer withholds for you, so this threshold is easy to cross.
- The safe harbor is the easiest path: pay 100% of last year’s total tax (110% if prior-year AGI exceeded $150,000), and you owe no underpayment penalty even if this year’s income is much higher.
- 2026 payment deadlines: April 15, June 15, September 15, 2026, and January 15, 2027. The quarters are uneven — Q2 covers only two months.
- The underpayment penalty is 7% annually in 2026, assessed separately for each quarter. A September overpayment cannot fix an April underpayment.
- Estimated payments are prepayments, not your tax return. You still file (and settle any balance or claim a refund) by the April filing deadline.
- This tool is federal only. Most states with an income tax have their own estimated payment requirements — check your state’s revenue department.
How the calculator works
- Enter your expected annual freelance profit — revenue after business expenses. The calculator uses it to estimate your self-employment tax.
- Enter your total tax from last year’s return — Form 1040, line 24 (“total tax”). This is the anchor for the safe-harbor calculation.
- Say whether your prior-year AGI exceeded $150,000. If yes, the safe harbor rises from 100% to 110% of last year’s tax. (The threshold is $75,000 if married filing separately.)
- Enter any W-2 withholding or other prepayments you expect this year. The calculator subtracts these, since tax already withheld counts toward the safe harbor.
- Read your quarterly payment. That is the per-installment amount that keeps you penalty-free. Pay it by each deadline in the table below.
The calculator also shows your estimated self-employment tax — 15.3% on your net earnings — so you can see how it fits into the bigger picture, and flags the 2026 underpayment penalty rate for reference.
Methodology: the safe-harbor method and self-employment tax
Why the safe harbor, not income-tax brackets?
Estimating this year’s federal income tax would require the current year’s tax brackets, deductions, and credits — moving parts this calculator deliberately avoids. The IRS safe harbor offers a shortcut that needs none of that: if you pay 100% of the tax shown on last year’s return (110% for higher-income taxpayers), you are protected from the underpayment penalty no matter what you earn this year. The only inputs are last year’s total tax, your high-income status, and this year’s expected withholding. It is the method most freelancers should use first.
The IRS also recognizes a 90%-of-current-year-tax safe harbor, but that requires estimating this year’s full tax bill — the very problem this tool sidesteps. If this is your first year freelancing and you have no prior-year return, you will need the 90% method instead; work through the Form 1040-ES worksheet to estimate this year’s tax.
The self-employment tax estimate
Freelancers pay both halves of Social Security and Medicare. The math the calculator runs:
- Net earnings = freelance profit × 92.35% (the IRS lets you exclude 7.65% of earnings first).
- Social Security: 12.4% on net earnings up to $184,500 for 2026 — the wage base cap.
- Medicare: 2.9% on all net earnings, uncapped.
- Combined on the first $184,500: 15.3%. Above the cap, only the 2.9% Medicare portion applies.
So for $80,000 of profit: net earnings are $73,880, entirely below the cap, giving $73,880 × 15.3% = $11,303.64 in SE tax. Half of your SE tax is deductible when you figure income tax — a detail that trims the income-tax portion of your bill, though it is not part of this calculator’s safe-harbor target.
(There is also an additional 0.9% Medicare tax on earnings above $200,000 single / $250,000 married filing jointly, which this estimate does not add — at those income levels, confirm the final number with the 1040-ES worksheet or a tax professional.)
Why the “quarters” are not quarters
One of the most common surprises: IRS payment periods are not equal. The “second quarter” runs from April 1 to May 31 — just two months — while the first covers January through March and the fourth stretches from September through December. The deadlines are spaced the way they are to keep you paying roughly as you earn. Practical takeaway: the June 15 deadline arrives fast, only two months after April 15. Set a calendar reminder for all four dates now.
2026 quarterly estimated tax deadlines
| Installment | Payment period | Due date |
|---|---|---|
| Q1 | Jan 1 – Mar 31, 2026 | April 15, 2026 |
| Q2 | Apr 1 – May 31, 2026 | June 15, 2026 |
| Q3 | Jun 1 – Aug 31, 2026 | September 15, 2026 |
| Q4 | Sep 1 – Dec 31, 2026 | January 15, 2027 |
If a deadline falls on a Saturday, Sunday, or legal holiday, payment is on time if made the next business day. Mailed payments count by U.S. postmark date. You do not have to pay only four times — weekly or monthly payments are fine, as long as enough has been paid by the end of each period.
How to pay: free online via IRS Direct Pay or EFTPS, by phone, through the IRS2Go app, or via your IRS online account. Paper payers can mail a check with the Form 1040-ES vouchers. Keep confirmations for every payment — you will need them at filing time.
Worked example
Meet a freelance designer who expects $80,000 of profit this year. Last year’s total tax (Form 1040, line 24) was $15,000, prior-year AGI was under $150,000, and there is no W-2 withholding.
Self-employment tax estimate: Net earnings = $80,000 × 92.35% = $73,880. This is below the $184,500 Social Security cap, so the full 15.3% rate applies: $73,880 × 0.153 = $11,303.64.
Safe-harbor quarterly payment: Safe harbor = 100% × $15,000 = $15,000 for the year. Minus $0 withholding = $15,000 ÷ 4 = $3,750 per quarter.
Paying $3,750 by April 15, June 15, September 15, 2026, and January 15, 2027 avoids the underpayment penalty regardless of actual 2026 income. If the designer’s prior-year AGI had exceeded $150,000, the safe harbor would be 110% × $15,000 = $16,500, or $4,125 per quarter instead.
Frequently asked questions
Who must pay quarterly estimated tax? Individuals — including sole proprietors, partners, and S corporation shareholders — generally have to make estimated tax payments if they expect to owe $1,000 or more when their return is filed. If you are in business for yourself, the IRS says you generally need to make estimated tax payments, because no employer withholds tax from your freelance income.
What are the 2026 quarterly estimated tax deadlines? April 15, 2026 (Q1), June 15, 2026 (Q2), September 15, 2026 (Q3), and January 15, 2027 (Q4). Note the uneven spacing — the second period covers only April and May. If a due date falls on a weekend or holiday, pay on the next business day.
What happens if I miss a quarterly payment? You may owe an underpayment penalty, assessed separately for each payment period. A large September payment does not erase an April shortfall — each quarter stands on its own. For 2026 the penalty rate is 7% annually on the underpaid amount per period. You can owe the penalty even if you end up due a refund when you file.
How do I actually pay estimated tax? Pay free online through IRS Direct Pay or EFTPS, by phone, via the IRS2Go app, or through your IRS online account — or mail a check with Form 1040-ES vouchers. You can pay weekly or monthly if that suits your cash flow, as long as enough is in by the end of each quarter.
What is the safe-harbor rule for avoiding the penalty? Most taxpayers avoid the underpayment penalty if they pay at least 90% of this year’s tax, or 100% of last year’s total tax, whichever is smaller. This calculator uses the prior-year method because it needs no bracket math. Higher-income taxpayers — prior-year AGI above $150,000 ($75,000 if married filing separately) — must pay 110% of last year’s tax instead.
My income is seasonal or uneven. Do I still pay four equal amounts? You can, for simplicity — but if most income arrives late in the year, equal installments overpay the early quarters. The IRS offers the annualized income installment method (Schedule AI of Form 2210), which matches payments to when income is actually earned and can reduce or eliminate the penalty. Keep records of when income arrived; you will need them.
Do estimated payments replace filing my tax return? No. Estimated payments are prepayments, like withholding from a paycheck. You still file your annual return by the April deadline, where the return reconciles what you prepaid against what you actually owe — resulting in a balance due or a refund.
What if I overpay my estimated taxes? Overpayments are credited on your return: you get them back as a refund, or you can apply them to next year’s estimated tax. Overpaying earns no interest, so the safe-harbor target is designed to keep you penalty-free without tying up extra cash.
Do I need to pay estimated tax to my state too? Most states with an income tax have their own estimated payment requirements, with separate deadlines and penalty rules. This calculator covers federal tax only — check your state’s revenue department for its forms and due dates.
This is my first year freelancing and I have no prior-year return. What do I use? Without a prior-year return there is no prior-year tax figure for the safe harbor, so use the 90%-of-current-year-tax method: estimate this year’s total tax with the Form 1040-ES worksheet and pay at least 90% of it in quarterly installments. (Also note: if you had zero tax liability last year and meet the other IRS conditions, you may not have to pay estimated tax at all this year.)
Related tools
Pair this calculator with the tax set-aside calculator to figure what percentage of each client payment to hold back, and the annual income planner to map your yearly revenue targets. If you take the home-office deduction, run the numbers in the home-office deduction calculator; pass-through income may also qualify for the write-off estimated in the QBI deduction estimator. Planning your working time around these payments? Try the billable hours calculator. Platform earners can check fee math with the Fiverr fee calculator, the 1099 vs W-2 calculator, or the per-word rate calculator — and Pakistan-based freelancers should see the Pakistan freelancer tax calculator. Browse everything in the tools directory.
These are estimates for planning purposes only — not professional tax advice. Tax law changes; confirm deadlines and rules with the IRS or a qualified tax professional before filing or paying.
Last verified: 2026-09-25
Schema note: This page emits FAQPage JSON-LD from the 10 FAQs above and HowTo JSON-LD from the 5-step “How the calculator works” section via the FC Tools Framework schema emitter. Meta title and description are set from the tool registration.