Payroll Tax API
4,246 US payroll tax jurisdictions in one API call
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Garrett Kirschbaum

Payroll Tax API - 4,246 US payroll tax jurisdictions in one API call

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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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Garrett Kirschbaum
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I was building a payroll feature and discovered the data problem. IRS publications change annually, state agencies post PDFs you have to manually read, and the commercial options (Symmetry/Gusto, Vertex) start at $17,500/year for enterprise contracts. So I built it: 4,246 jurisdictions including all 50 states, 200+ counties, 3,278 cities, and 713 school districts. Effective-date versioned — pass any payDate and get historically accurate rates. Free tier: 1,000 req/month, no credit card.