Estimate customer sales tax, Washington B&O tax, gross job profit and gross margin in one place.
Enter the contract amount before sales tax. Use the official WA DOR rate for the job location.
Prime/custom construction: the calculator treats the contract as retail construction, estimates retail sales tax on the contract amount, and uses the Washington retailing B&O rate of 0.471%.
Subcontractor with a valid reseller permit: the calculator estimates no retail sales tax collected from the prime contractor and uses the wholesaling B&O rate of 0.484%.
Subcontractor without a valid reseller permit: the calculator treats the transaction as retail for this simplified estimate, applies the entered sales-tax rate, and uses retailing B&O.
Actual tax treatment can vary with the project, customer, exemptions, deductions and construction classification. Verify tax treatment with the Washington Department of Revenue construction tax matrix or a qualified tax professional.