Invoicing in Washington

Built-in handling of WA sales tax (6.5% state rate) and statutory late fees.

State sales tax
6.50%
Late fee max
1.5%/mo
Metros covered
11
Written contract req.
No
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Washington compliance at a glance

  • Sales tax: 6.50% state rate. State 6.5%; many services taxable. Combined commonly 8.5-10.5%.
  • Late fees: Up to 1.5% per month. (Wash. Rev. Code 搂19.52.020) Default 12%/yr; contract rates up to 12%/yr or Fed discount + 4%.
  • Prompt-pay law: Washington Prompt Payment Act (RCW 39.04.250 for public; RCW 60.28 for construction). Construction subs paid within 30 days of GC receiving payment; 1% per month interest if late.

Washington metros

Washington guides