Wa State Tax Calulator

Provided for SIC Subcontractors Use to comply with the new law (Engrossed Substitute Senate Bill 5814) that went into effect on October 1, 2025,

WA Services Tax Calculator (Post-Oct 2025)

WA Services Tax Calculator

Based on the Washington state tax changes effective October 1, 2025. Choose your service type below for accurate Sales Tax and B&O calculations. Includes complete King County ZIP code database.

Select Service Classification

*The choice determines the B&O tax rate and if Retail Sales Tax must be collected.

Override B&O Rate (%) - Optional

*Override the default B&O rate if your business qualifies for a different rate (e.g., 1.75% for certain services).

Base Service Fee (Pre-Tax)

Customer's ZIP Code (for Sales Tax Sourcing)

*Required for taxable services. Enter the 5-digit ZIP code where the customer receives the service.

Database includes all King County ZIP codes (Seattle, Bellevue, Renton, Kent, Auburn, Redmond, Kirkland, and more) plus sample rates for other WA counties.

Estimated Federal Income Tax Rate

**IMPORTANT:** Use your effective rate (e.g., 25%). Self-Employment Tax (15.3%) is now calculated automatically below.

Tax Breakdown & Invoice Summary

1. Retail Sales Tax (RST) to Collect $0.00

2. B&O Tax Owed (0.5% Gross) $0.00

Total Invoice Amount (Client Pays) $0.00

Total State Tax Liability (1 + 2) $0.00

3. Net Receipts (Before Federal Taxes) $0.00

*Net Receipts Before Federal Taxes = Base Fee - B&O Tax.

4. Estimated Federal Self-Employment Tax (15.3%) $0.00

*SE Tax = 92.35% of Net Receipts × 15.3% (Social Security + Medicare).

5. Estimated Federal Income Tax $0.00

Total Federal Tax Burden (4 + 5) $0.00

Final Net Take-Home Profit $0.00

*Final Net = Net Receipts - SE Tax - Federal Income Tax.

2025 Federal Income Tax Brackets (Single Filer)

This table helps you determine your **marginal** tax rate for estimated quarterly payments. Your profit (Net Receipts) falls into these brackets. (Note: Washington has no state income tax).

Tax Rate	Taxable Income Bracket
10%	$0 to $11,925
12%	$11,926 to $48,475
22%	$48,476 to $103,350
24%	$103,351 to $197,300
32%	$197,301 to $250,525
35%	$250,526 to $626,350
37%	$626,351 +