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//// Tax · Washington

Washington 1099 Quarterly Tax

SE income → SE tax + federal → quarterly estimated payment. WA has no state income tax.

Where this fits

🧾 TaxTax StackGoing 1099Freelancers

This tool lives inside Tax Stack + Going 1099 and is most useful for freelancers.

401(k) Limit 2024$23,000
Roth IRA Limit$7,000
S&P 500 Avg Return~10%/yr

Income

Quarterly payment
$4,616
estimated
Annual tax
$18,464
SE + federal + state
Safe harbor
$3,500
prior year ÷ 4
Effective rate
24.0%
of net SE income

Tax breakdown

Self-employment tax$10,880
Federal income tax$7,584
Washington state tax$0
Total annual$18,464
Per quarter$4,616
Per month (set aside)$1,539
1

Net self-employment income

netSE = gross − expenses

= $95,000 − $18,000

= $77,000

2

Self-employment tax (Schedule SE)

SE base = netSE × 92.35%; SE tax = base × 15.3%

= $10,880

SE tax = Social Security (12.4%) + Medicare (2.9%)

3

Adjusted gross income

AGI = netSE − (SE tax × 50%)

= $77,000 − $5,440

= $71,560

The 50% SE deduction compensates for the employer half of FICA

4

Federal income tax

federal = brackets(AGI − standard deduction)

= brackets($71,560 − $14,600)

= $7,584

Taxable income: $56,960 · Standard deduction: $14,600

5

Washington state tax

= $0

Washington has no state income tax. Self-employed may owe B&O tax on gross receipts.

6

Quarterly payment

quarterly = totalAnnualTax ÷ 4

= $18,464 ÷ 4

= $4,616

IRS Form 1040-ES due: April 15, June 15, September 15, January 15

Key insight

Washington has no state income tax. Self-employed may owe B&O tax on gross receipts. Pay quarterly by: April 15 (Q1), June 15 (Q2), September 15 (Q3), January 15 (Q4). Underpaying triggers a penalty (~8% annualized on the shortfall). When in doubt, pay the safe harbor amount.

Use this result in →

📅Quarterly Tax Calculator💸Self-Employment Tax

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