Estimated Quarterly Taxes
The self-employed person's substitute for withholding — and how to never pay the penalty.
Educational content only — not tax advice. Estimated tax requirements depend on your full tax picture. Consult a tax professional for payment amounts.
Why This Matters
When a W-2 employee gets a paycheck, taxes are withheld automatically. When you're self-employed, no one withholds anything — and the IRS expects you to proactively send payments throughout the year.
Fail to do this, and you face an underpayment penalty — even if you pay everything owed in full on April 15. The penalty is based on how late the money arrived, not whether you ultimately paid.
For ABC Coffee Shop's owner with ~$30,000 in total annual federal tax, sending one check in April guarantees a penalty. Sending four $7,500 payments on schedule eliminates it entirely.
Who Must Pay
ESTIMATED TAX REQUIRED WHEN BOTH ARE TRUE:
1. You expect to owe at least $1,000 in federal tax after withholding and credits.
2. Withholding and credits cover LESS THAN 90% of current-year tax OR 100%/110% of prior-year tax.
✓ Sole proprietors, S-corp owners, partners, landlords, gig workers
✗ W-2 employees whose withholding covers their tax; anyone owing < $1,000
Estimated Tax / Safe Harbor Calculator
Safe Harbor 1: 90% Current Year
$22,073 × 90% = $19,866
$4,966/quarter
Safe Harbor 2: 100% Prior Year
$26,500 × 100% = $26,500
$6,625/quarter
Recommended (lower safe harbor)
$4,966/quarter
Method: Current Year (90%) · Annual: $19,866
2025 Due Dates
Q1
April 15, 2025
Jan 1 – Mar 31
$4,966
Q2
June 15, 2025
Apr 1 – May 31
$4,966
Q3
September 15, 2025
Jun 1 – Aug 31
$4,966
Q4
January 15, 2026
Sep 1 – Dec 31
$4,966
The Two Safe Harbor Methods
Safe Harbor 1: 90% of Current Year
Pay at least 90% of what you'll actually owe, split across four periods.
$29,955 × 90% ÷ 4 = $6,740/quarter
Hard for seasonal or unpredictable revenue — requires accurate projection.
Safe Harbor 2: 100%/110% Prior Year (Preferred)
Pay last year's total tax — amount is fixed and known. 110% if prior AGI > $150K.
$26,500 ÷ 4 = $6,625/quarter
Protected even if income skyrockets. If income drops, you get a refund.
OPTIMAL STRATEGY: Calculate BOTH. Pay whichever is LOWER while still guaranteeing no penalty.
Full Calculation Walkthrough
ABC OWNER — 2025 PLANNING
Schedule C net profit: $120,000
SE tax deduction: − $8,478
SE health insurance: − $14,400
SEP-IRA: − $23,089
Expected AGI: $75,233
Standard deduction + QBI: − $30,597
Taxable income: $44,636
Income tax: $5,118
SE tax: $16,955
TOTAL EXPECTED TAX: $22,073
90% current: $4,967/qtr · Prior year: $6,625/qtr → Choose $4,967
How to Actually Pay
- 1.
EFTPS (eftps.gov)
Free. Schedule all four quarters at once. Best for systematic payers. Requires 2–5 day enrollment.
- 2.
IRS Direct Pay (irs.gov/directpay)
Free. Debit from bank. No enrollment. Best for occasional payments.
- 3.
IRS2GO App
Free mobile payments via bank or debit card.
- 4.
Credit/Debit Card
Fee ~1.82%–1.98%. Only if rewards exceed fee.
- 5.
Paper Check (1040-ES voucher)
Most error-prone — USPS delays don't excuse lateness.
Adjusting During the Year
CATCH-UP STRATEGIES
- Great summer? Make a larger Q3 payment (September 15) to catch up on underestimated income.
- W-2 income too? Increase W-4 withholding — treated as paid evenly all year.
- Seasonal business? Annualized Income Method (Form 2210, Schedule AI) bases each quarter on actual income earned through that period.
April 15 Reconciliation
ABC OWNER — APRIL 2026
Actual 2025 total federal tax: $22,073
Less: estimated payments (4 × $4,967): − $19,868
Balance due April 15, 2026: $2,205
No underpayment penalty — met 90% current-year safe harbor.
The Underpayment Penalty
Form 2210 — calculated per quarter
Rate: Federal short-term rate + 3% (~7–8% annualized, compounded daily)
Example: Owed $6,625 Q1, paid $3,000 → $3,625 underpayment × 8% × (61/365) = $48.63
Penalty may be waived for retirement, disability, or casualty/disaster.
Common Mistakes
Mistake 1: Paying nothing all year, one big check in April
Guarantees underpayment penalty for all four quarters.
Mistake 2: Missing Q2's June 15 deadline
Only 2 months after Q1 — the most commonly missed date.
Mistake 3: Not including SE tax in calculations
Total tax = income tax + SE tax.
Mistake 4: Forgetting state estimated taxes
Federal and state are separate obligations.
Key Takeaway
Self-employed individuals must pay estimated taxes quarterly. Two safe harbors guarantee no penalty: pay 90% of this year's projected tax, OR 100% (110% if prior AGI > $150,000) of last year's total tax. Due dates: April 15, June 15, September 15, and January 15. EFTPS is the most reliable method. Always include SE tax — not just income tax — in quarterly calculations.
Test Your Understanding
Question 1: ABC's owner paid $24,000 total federal tax in 2024 (AGI $110,000). Minimum quarterly payment for 2025 under the prior year safe harbor?
Question 2: When is the Q2 2025 estimated tax payment due?
Ready to Practice?
Model safe harbor payments, due dates, and catch-up strategies in the Practice Lab.
Try the Practice LabWhat's Next?
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