As a freelancer or self-employed worker, the IRS expects you to pay taxes throughout the year — not just at filing time. If you owe more than $1,000 in taxes, you’re required to make quarterly estimated payments or face underpayment penalties. Use our Quarterly Estimated Tax Calculator to find out exactly how much to send the IRS each quarter in 2026, so you stay compliant and avoid surprises.
Your Quarterly Payment
due each quarter to the IRS
| Net self-employment income | |
| Self-employment tax | |
| Federal income tax | |
| Total annual tax | |
| − Tax already withheld | |
| Remaining tax owed | |
| ÷ 4 = Quarterly payment |
2026 Quarterly Due Dates:
| Q1 (Jan–Mar) | April 15, 2026 |
| Q2 (Apr–May) | June 15, 2026 |
| Q3 (Jun–Aug) | September 15, 2026 |
| Q4 (Sep–Dec) | January 15, 2027 |
Avoid penalties: Pay at least 90% of your current year tax or 100% of last year’s tax (110% if AGI was over $150K) to avoid underpayment penalties. Use IRS Form 1040-ES to submit payments.
How This Calculator Works
When you work as a W-2 employee, your employer withholds taxes from every paycheck. As a freelancer, nobody does that for you. The IRS still wants their money on a regular schedule — which is why they created the quarterly estimated tax system.
What Estimated Tax Payments Cover
Your quarterly payment covers two separate federal taxes:
Self-employment tax (15.3%) — this is your Social Security (12.4%) and Medicare (2.9%) contribution. It's calculated on 92.35% of your net self-employment earnings. Unlike income tax, there's no standard deduction against SE tax.
Federal income tax — this is calculated on your taxable income after the standard deduction, half of your SE tax deduction, and any other adjustments. The 2026 federal brackets apply based on your filing status.
How the Calculator Determines Your Payment
1. Net self-employment income = gross income minus business expenses 2. SE tax is calculated on 92.35% of net SE income 3. Income tax is calculated using 2026 brackets after deductions 4. Total annual tax = SE tax + income tax 5. Minus any withholding from W-2 jobs or other sources 6. Divide by 4 = your quarterly payment
The Safe Harbor Rule
The IRS provides a "safe harbor" — if you pay enough through quarterly estimates, you won't owe underpayment penalties even if your actual tax ends up being higher. You're safe if you pay at least: - 90% of your current year's tax liability, OR - 100% of your previous year's tax liability (110% if your AGI was over $150,000)
Most freelancers use last year's tax as their baseline, then adjust upward if income is increasing.
Key Factors That Affect Your Quarterly Payments
Income fluctuations are common for freelancers. If your income varies significantly quarter to quarter, you can use the annualized income installment method (IRS Form 2210, Schedule AI) to base each quarterly payment on actual income received that quarter. This prevents overpaying during slow quarters.
W-2 income reduces your quarterly payments. If you have a day job with tax withholding alongside your freelance work, that withholding counts toward your annual tax obligation. Enter your expected withholding in the calculator to see the reduced quarterly amount.
Business deductions directly reduce your payments. Every dollar you deduct is a dollar you don't pay SE tax or income tax on. Keep meticulous records of deductible expenses throughout the year — software, equipment, home office, mileage, professional development, insurance premiums, and more.
State taxes are separate. This calculator covers federal taxes only. Most states with income tax also require quarterly estimated payments. Check your state's tax authority website for requirements and due dates, which may differ from federal deadlines.
Retirement contributions to a Solo 401(k) or SEP IRA reduce your income tax (but not SE tax). If you're making retirement contributions, factor them in for a more accurate income tax estimate.
Frequently Asked Questions
When are quarterly estimated taxes due in 2026?
The four due dates for 2026 federal estimated tax payments are: Q1: April 15, 2026 (for income earned January–March), Q2: June 15, 2026 (April–May), Q3: September 15, 2026 (June–August), and Q4: January 15, 2027 (September–December). If a due date falls on a weekend or holiday, the deadline moves to the next business day.
What happens if I don't pay quarterly estimated taxes?
The IRS charges an underpayment penalty, which is essentially interest on the unpaid amount. The penalty rate changes quarterly and is based on the federal short-term rate plus 3 percentage points. While the penalty isn't huge, it adds up — and it's entirely avoidable by making timely payments.
How do I actually pay quarterly estimated taxes?
The easiest method is IRS Direct Pay (irs.gov/payments) — free, instant, directly from your bank account. You can also use EFTPS (Electronic Federal Tax Payment System), pay by credit card (processing fee applies), or mail a check with Form 1040-ES voucher. IRS Direct Pay is recommended for simplicity.
Do I need to pay quarterly taxes in my first year of freelancing?
If you expect to owe $1,000 or more in federal taxes for the year, yes. However, if you had no tax liability in the prior year (you paid $0 in taxes), you may be exempt from the underpayment penalty for the current year. Regardless, it's smart to start paying quarterly from the beginning to avoid a large tax bill in April.
Can I pay more than the calculated quarterly amount?
Yes, and it's often a good idea. If you're having a strong income year, increasing your quarterly payments prevents a large balance due at filing time. You can adjust your payment amount each quarter based on actual income. Any overpayment is refunded or applied to next year's taxes.
What if my income is irregular throughout the year?
You have two options: pay equal quarterly amounts based on your annual estimate (simpler), or use the annualized income installment method to base each payment on actual income earned that quarter (more complex but avoids overpaying during slow periods). Most freelancers stick with equal payments for simplicity.
Related Calculators
- Self-Employment Tax Calculator — Detailed breakdown of your SE tax components
- Freelance Hourly Rate Calculator — Make sure your rate accounts for quarterly tax obligations
- 1099 vs W-2 Comparison Calculator — See why quarterly payments exist for freelancers
- Freelance Break-Even Calculator — Factor quarterly taxes into your break-even analysis
- State-by-State Freelance Tax Calculator — Estimate state-level taxes alongside federal