Quarterly tax estimator: Calculate your 2026 payments
If you're self-employed and expect to owe at least $1,000 in federal tax this year, the IRS requires you to pay it in quarterly installments instead of one lump sum in April.1Solvent's free quarterly tax estimator calculates those four payments using your income, filing status, and the IRS's 2026 rates, brackets, and safe harbor rules.
Miss a deadline, or underpay by too much, and the IRS charges interest on the shortfall for every day it goes unpaid.7The hard part usually isn't the math. It's that freelance income rarely lands on the same schedule the IRS expects. This guide walks through the calculation methods, the 2026 due dates, and how to pay once you have your number.
Reduces how much SE income is still subject to Social Security.
Net profit: gross 1099 income minus business expenses.
Credited toward your target before splitting the remainder into quarters.
Enables the safe-harbor method alongside the current-year estimate.
How we calculate this
Method 1, safe harbor: 100% of your prior year's total tax liability (110% if your prior-year AGI exceeded $150,000, or $75,000 if married filing separately), divided by four. This method fully protects you from an underpayment penalty no matter how your current year turns out.
Method 2, current-year estimate: net self-employment income × 92.35% for net earnings, then 12.4% Social Security (capped at the wage base, net of any W-2 wages) plus 2.9% Medicare (uncapped) plus 0.9% Additional Medicare Tax above your filing-status threshold. Income tax applies the current year's brackets to (net income − half of SE tax − standard deduction − 20% QBI deduction). We target 90% of that combined total, credit any W-2 withholding, and divide the remainder by four.
The QBI deduction here is a flat 20% simplification. It doesn't model the §199A phase-out or specified-service-trade limits at higher incomes.
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This is an estimate, not tax advice. Consult a professional about your specific situation.
Your numbers never leave your browser.
2026 figures verified against IRS Rev. Proc. 2025-32 and the SSA wage base.
How to use the quarterly tax estimator
Doing this by hand means running separate calculations for income tax, self-employment tax, and your deductions, then reconciling all three. The calculator handles that in your browser, no account required. Enter your numbers and get your quarterly breakdown.
Step 1: Enter your income
Start by projecting your net self-employment earnings for the full year: gross revenue minus the business expenses you expect to claim. If you also have W-2 wages or other taxable income, add those too. They affect which bracket your self-employment income lands in, and how much of it is still subject to Social Security tax.
Step 2: Choose your method
Pick a calculation method inside the tool: current-year projected earnings, or the prior-year safe harbor. If your income is likely to jump partway through the year, the safe harbor method is what protects you from a penalty on the difference.
Step 3: Get your four payment amounts
The tool divides your total estimated liability into four equal installments and shows the exact amount due for each 2026 deadline. Use those figures to fund a separate savings account, or pay directly through IRS Direct Pay or EFTPS.
How to calculate your quarterly estimated taxes
Running the numbers by hand is worth doing at least once, even if you plan to use the calculator every quarter after. It's how you catch a data-entry mistake, and it's how you understand what you're actually paying for. The IRS recognizes a few approved methods, and which one fits depends on how predictable your income is.
Method 1: The prior-year safe harbor
This is the simplest way to avoid a penalty entirely. Pay 100% of last year's total tax liability, or 110% if your prior-year adjusted gross income was over $150,000, and the IRS can't penalize you no matter how much your income grows this year.6Divide that number by four for your quarterly payment. For edge cases, like a year where your income actually drops, see our full safe harbor rule guide.
Method 2: The current-year estimate
If your income is falling, or you'd rather pay based on what you're actually earning, calculate this year's expected liability directly. Multiply your net business profit by 92.35% to get your self-employment tax base.2Apply 12.4% for Social Security on earnings up to the $184,500 wage base, plus 2.9% for Medicare on all of your net earnings.3Our self-employment tax guide covers the full mechanics, and you can check your own numbers with the Solvent Self-Employment Tax Calculator. From there, subtract half of your self-employment tax, the standard deduction ($16,100 for single filers, $32,200 for married filing jointly), and the 20% qualified business income deduction before running what's left through the federal brackets.45
Method 3: Annualized income installment method
If your income is seasonal (landscaping concentrated in summer, retail concentrated in December), paying four equal installments can strain your slow months for no good reason. The annualized income installment method calculates each payment based on what you actually earned in that period, not a fourth of your annual guess. It requires filing Form 2210 with your return to document the uneven payments. Clean expense records, including your Schedule C deductions, make this method far less painful at filing time.
2026 quarterly due dates
The IRS calendar doesn't follow standard three-month quarters. Here's the official schedule for tax year 2026 payments.
| Quarter | Covers income from | Due date |
|---|---|---|
| Q1 | January 1 – March 31 | April 15, 2026 |
| Q2 | April 1 – May 31 | June 15, 2026 |
| Q3 | June 1 – August 31 | September 15, 2026 |
| Q4 | September 1 – December 31 | January 15, 2027 |
Notice that Q2 covers only two months while Q4 spans four. Mark these dates on your calendar rather than counting on a reminder from the IRS, because there isn't one.
How much should I set aside for quarterly taxes?
A common rule of thumb for moderate-income freelancers is to set aside 25% to 30% of every client payment as soon as it arrives, in a separate account you don't touch for anything else. That keeps tax money from quietly becoming operating cash. The right percentage for you depends on your filing status, your state's tax rate, and your total annual revenue, so treat this as a starting point, not a target. Once you've run your actual numbers through the calculator, use that figure instead of the rule of thumb.
Worked example: Quarterly taxes on $30,000 self-employed income
A concrete number makes the formula easier to trust. Take a single freelancer projecting $30,000 in net self-employment profit for 2026, with no W-2 income.
Calculating the example
The self-employment tax base is net profit multiplied by 92.35%: $27,705. Applying the combined 15.3% self-employment tax rate gives $4,239 in self-employment tax. Half of that, $2,119, is deducted from net profit on the way to adjusted gross income. Subtract the $16,100 standard deduction and the 20% qualified business income deduction, and what's left is the taxable income that federal income tax rates apply to. Add the income tax ($578) and self-employment tax together for a total annual liability of about $4,817. The calculator targets 90% of that total, the standard current-year safe-harbor threshold, then divides by four for about $1,084 per quarter, reported on Form 1040-ES.
Quarterly payments by income level
Rough quarterly payment estimates across different net income levels, for single filers taking the standard deduction.
| Net self-employed income | Estimated quarterly payment |
|---|---|
| $25,000 | $843 |
| $50,000 | $2,084 |
| $75,000 | $3,371 |
| $100,000 | $4,803 |
| $150,000 | $8,197 |
Actual obligations vary based on state taxes, local levies, other household income, and your specific business deductions. Use the calculator for a number you can rely on.
How to pay your quarterly taxes
Getting the payment method right matters as much as getting the number right. A correct payment sent the wrong way can still post late.
IRS Direct Pay and EFTPS
IRS Direct Pay is the fastest free way to send an estimated payment straight from your bank account. Log into the IRS website, select estimated tax as the reason for payment, and authorize the transfer. The Electronic Federal Tax Payment System is the other standard option, though it requires setting up an account in advance rather than paying on the spot.
Mailing Form 1040-ES
If you'd rather mail a check, attach the voucher from Form 1040-ES. Make the check payable to the United States Treasury, and write your Social Security number and "2026 Form 1040-ES" on the memo line. Mail it to the address listed for your state in the form instructions, not a generic IRS address.
State payment portals
Federal payments don't cover your state obligations. Check your state Department of Revenue's website to set up quarterly state payments; most states run an online portal similar to IRS Direct Pay.
What happens if you miss a payment
Missing a deadline, or paying less than you owe, triggers an underpayment penalty. The IRS calculates it using the federal short-term interest rate plus three percentage points, applied to the unpaid amount for every day it stays that way. The safe harbor rule eliminates this risk entirely. If you do miss a deadline, pay as soon as you can. The penalty is calculated daily, so every day you wait adds to it.
State quarterly taxes
Most states with an income tax require their own quarterly estimated payments from independent contractors. Thresholds and due dates often mirror the federal rules, but rates vary a lot by state. Check your state tax agency's guidelines directly rather than assuming your state matches the federal pattern.
Common quarterly tax mistakes to avoid
A few mistakes come up again and again. Waiting until April to pay the entire year's tax bill invites a real penalty, not just a bigger bill. Using gross revenue instead of net profit as your base overestimates what you owe by a wide margin. Forgetting state estimated tax creates a second, separate surprise at filing time. None of these are complicated to avoid, they just require running the numbers each quarter instead of once a year.
How we calculate your estimate
Our calculator is built directly from IRS guidance: Publication 505 for the general estimated tax rules, the Schedule SE instructions for the self-employment tax calculation, and the Form 2210 instructions for the safe harbor and penalty mechanics.8We update the underlying rates, brackets, and thresholds every year to match the IRS's current figures rather than carrying last year's numbers forward.
Frequently asked questions about estimating quarterly taxes
Is it worth paying quarterly taxes?
Yes. Paying quarterly avoids a massive lump-sum bill in April and protects you from the underpayment penalty the IRS assesses on freelancers and contractors who wait.
How much tax will I pay on $30,000 a year self-employed?
For a single filer with $30,000 in net self-employment profit, no W-2 income, and the standard deduction, total federal tax for the year comes to about $4,817, combining self-employment tax and income tax. Run your own numbers through the calculator above for your quarterly split.
How do I pay quarterly taxes if I'm self-employed?
Pay online through IRS Direct Pay, schedule a transfer through EFTPS, or mail a check with a Form 1040-ES payment voucher.
How much should I set aside for quarterly taxes?
Setting aside 25% to 30% of every client payment into a separate account covers most federal and state liabilities comfortably for a moderate-income freelancer, though your exact number depends on your situation.
How to calculate quarterly income tax?
Estimate your annual net profit, subtract your allowable deductions, calculate self-employment and income tax separately, add them together, then divide by four.
Nicolas Straut
Personal and business finance writer, former Forbes contributor
Sources
- IRS, Estimated Taxes
- IRS, Instructions for Schedule SE (Form 1040), Self-Employment Tax
- SSA, 2026 COLA Fact Sheet
- IRS, Tax inflation adjustments for tax year 2026, Revenue Procedure 2025-32
- IRS, Qualified Business Income Deduction
- IRS, Instructions for Form 2210, Underpayment of Estimated Tax
- IRS, Underpayment of Estimated Tax by Individuals Penalty
- IRS, Publication 505 (2026), Tax Withholding and Estimated Tax