Who has to pay quarterly estimated taxes?
You owe quarterly estimates if you expect to owe $1,000+ in federal tax AND your withholding won't cover 90% of this year's tax (or 100% of last year's — 110% if AGI over $150k). That includes:
- Freelancers and 1099 contractors
- Gig workers (Uber, DoorDash, Instacart)
- Small business owners (Schedule C, S-corp, partnership)
- Landlords with rental profit
- Investors with large capital gains not offset by losses
- Anyone with significant side income while also having a W-2
2026 due dates
- Q1 (Jan–Mar income): April 15, 2026
- Q2 (Apr–May income): June 16, 2026
- Q3 (Jun–Aug income): September 15, 2026
- Q4 (Sept–Dec income): January 15, 2027
Note: Q2 is only 2 months (not 3) — the IRS's weird calendar. Don't miss it.
Safe harbor rules (avoid the penalty)
You avoid underpayment penalty if you pay the SMALLER of:
- 90% of this year's actual tax liability
- 100% of last year's total tax (110% if prior-year AGI over $150k)
For most freelancers, matching last year's tax is the easiest safe harbor. Simple rule: divide last year's total tax by 4 and pay that each quarter regardless of current income fluctuations.
How to pay
- IRS Direct Pay — irs.gov/payments. Free, direct from your bank account. Easiest option.
- EFTPS — business-focused, requires enrollment, but useful for larger payments
- Form 1040-ES coupon + check — the old-school way, but still works
- Credit card — allowed via IRS-approved processors, but 2-3% fee usually isn't worth it
State estimates are separate — pay through your state revenue department's website. Your federal calculator number does NOT include state.
What if your income is lumpy or seasonal?
You can use the annualized income installment method (Form 2210 Schedule AI) to pay based on ACTUAL year-to-date income instead of 1/4 of annual estimate. Useful if you have a huge Q4 bonus or a seasonal business. It's more complex but can avoid overpaying early in the year.
What happens if you miss or underpay
Underpayment penalty in 2026 is approximately 8% annualized (adjusted quarterly based on federal short-term rate + 3%). The IRS will bill you for the penalty when you file your annual return.
On small underpayments ($500-$1,000), the penalty is usually $20-$80 — annoying but not catastrophic. On a $20,000 underpayment held for a full year, you'd owe ~$1,600 in penalties. The math on paying estimates on time is a no-brainer.