Who needs to pay quarterly estimated taxes?
You must pay quarterly if you expect to owe $1,000+ in tax after withholding. This applies to freelancers, self-employed individuals, landlords, and investors — anyone who doesn't have sufficient withholding from a paycheck.
What are the 2026 quarterly due dates?
Q1 (Jan–Mar): April 15, 2026 · Q2 (Apr–May): June 16, 2026 · Q3 (Jun–Aug): September 15, 2026 · Q4 (Sep–Dec): January 15, 2027. Mark these on your calendar or set up auto-pay on EFTPS.
What is the safe harbor rule?
Pay at least 100% of last year's tax (or 110% if prior AGI > $150K) OR 90% of this year's estimate, whichever is less. Meeting safe harbor protects you from underpayment penalties completely.
How is self-employment tax calculated?
SE tax = net income × 92.35% × 15.3%. The 92.35% factor accounts for the employer-equivalent deduction. You can deduct half of SE tax from your income, and may also qualify for the 20% QBI deduction.
What is the 2025 underpayment penalty rate?
8% annualized, calculated daily on the underpaid amount. It's the IRS federal short-term rate plus 3 percentage points, adjusted quarterly by the IRS.
Can my W-2 withholding replace quarterly payments?
Yes — if your W-2 withholding is large enough to cover your total estimated tax, you don't need additional quarterly payments. This calculator automatically subtracts your W-2 withholding from the required quarterly amount.
What is the QBI deduction?
The Qualified Business Income deduction lets eligible self-employed individuals deduct up to 20% of qualified business income, reducing federal taxable income significantly. Income and industry limits apply — consult a tax professional for complex situations.
How do retirement contributions help?
Traditional 401(k), SEP-IRA, and SIMPLE IRA contributions reduce your taxable income dollar-for-dollar. A $10,000 SEP-IRA contribution in the 22% bracket saves $2,200 in federal tax plus applicable SE tax savings.
Do I need separate state estimated tax payments?
Yes, most states require separate state estimated tax payments. Our calculator estimates your state tax — contact your state's revenue department for exact requirements, forms, and due dates.
What if I overpay quarterly?
You'll receive a refund when you file or can apply the overpayment to next year. There's no penalty for overpaying. Many self-employed individuals intentionally overpay slightly as a forced savings strategy.
Can I adjust payments during the year?
Absolutely. Recalculate each quarter based on actual year-to-date income. If Q1 was a slow month, you may owe less for Q1. If Q3 was a banner quarter, increase your Q3 or Q4 payment to catch up.
What is the annualized income installment method?
This IRS method (Form 2210 Schedule AI) allows you to match payments to when income is actually earned, rather than paying equal quarterly amounts. Useful for seasonal businesses with uneven income.
How do I set up EFTPS?
Visit eftps.gov to enroll. It takes 7–10 business days to receive your PIN by mail. Once set up, you can schedule payments up to 365 days in advance and receive confirmation numbers for each payment.
What if I can't make a quarterly payment?
Pay as much as possible. The underpayment penalty (8%) is relatively small. Unpaid taxes don't trigger liens or aggressive collection at the quarterly level — those consequences come from not filing the annual return or ignoring IRS notices.
Is there a de minimis exception to the penalty?
Yes — no penalty applies if you owe less than $1,000 when you file your return, or if your total withholding equals at least 90% of this year's tax. The IRS also waives the penalty for certain first-time filers and extraordinary circumstances.