Quarterly Tax Payment Worksheet

Quarterly Payment Deadlines

Quarter	Income Period	Payment Due Date
Q1	January 1 - March 31	April 15
Q2	April 1 - May 31	June 15
Q3	June 1 - August 31	September 15
Q4	September 1 - December 31	January 15 (following year)

⚠️ Penalty Avoidance: To avoid underpayment penalties, pay at least 90% of current year tax or 100% of prior year tax (110% if AGI > $150,000).

Estimated Tax Calculation Worksheet

1. Expected annual gross income

2. Expected business deductions

3. Net business income (Line 1 - Line 2)

4. Self-employment tax (Line 3 × 15.3%)

5. Adjusted gross income (Line 3 - half of Line 4)

6. Standard/itemized deductions

7. Taxable income (Line 5 - Line 6)

8. Federal income tax (use tax tables)

9. Total tax (Line 4 + Line 8)

10. Tax credits (if any)

11. Withholding from W-2 jobs (if any)

QUARTERLY PAYMENT (Line 9 - Line 10 - Line 11) ÷ 4

💡 Pro Tip: If your income varies throughout the year, you can use the annualized income installment method to pay based on actual quarterly income rather than equal payments. This can help with cash flow.

How to Pay

IRS Direct Pay: www.irs.gov/payments/direct-pay (free)
EFTPS: Electronic Federal Tax Payment System (enrollment required)
Mail: Form 1040-ES with check to IRS
Washington State: dor.wa.gov for state estimated payments

Quarterly Estimated Tax Payment Worksheet

Quarterly Payment Deadlines

Estimated Tax Calculation Worksheet

How to Pay

Need Help Calculating Quarterly Taxes?