Guides, comparisons, and deep dives on US payroll tax compliance for developers.
Head-to-head comparison of payroll tax API providers for 2024-2026. Compare Symmetry, Vertex, Avalara, and PayrollTax API on pricing, jurisdiction coverage, and developer experience.
Original data analysis of 4,246 US tax jurisdictions. See which states have the most local payroll taxes, where rates are highest, and why payroll compliance is harder than you think.
A developer's guide to local payroll taxes in the US. Understand city income taxes, county occupational taxes, school district levies, and how 4,246 jurisdictions create the hardest problem in payroll.
Complete guide to Kentucky OLT rates for developers building payroll systems. All 120 counties and 33+ cities with rate tables, stacking rules, and API integration for 2024-2026.
Developer guide to Ohio's complex municipal income tax system. Understand RITA, CCA, and self-administered cities with rate tables and API examples for 2024-2026.
Why multi-state payroll is harder than you think. The local tax layer adds thousands of jurisdictions with different rates, rules, and filing requirements that most teams underestimate.
Developer guide to Pennsylvania's Act 32 Earned Income Tax system. 2,573+ municipalities, PSD codes, tax collection districts, and integration tips for payroll software covering 2024-2026.