

What is Payroll Tax API?
US payroll tax data is fragmented across IRS, 50 state agencies, and thousands of local jurisdictions. Payroll Tax API covers 4,246 jurisdictions: federal income brackets, FICA, FUTA, all 50 states + DC, 200+ counties, 3,278 cities, and 713 school districts. One API call returns all applicable rates stacked. Effective-date versioned. Free tier: 1,000 req/month, no credit card.
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PayrollTax API — Every US payroll tax, one API call
REST API for US payroll tax rates. Federal, state, and local taxes for 4,246 jurisdictions. FICA, FUTA, SUTA, SDI, city, county, and school district taxes. Free tier available.
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