US payroll, tax and filing deadlines — 2026 checks

Thresholds, rates and filing windows that moved for 2026: payroll taxes, information returns, benefits limits, state rules and federal forms. Each check runs on your own numbers and names the rule it applies.

42 tools

Questions

Do my files leave my computer?

No. The extensions and command-line checks run on your machine and your files are not uploaded. The browser calculators run in the page.

What does it cost?

Every tool is free for the file or case in front of you. The paid part is a one-time licence key; each tool page shows its price and what the key adds. A team key ($149 once) opens every ReadyStack linter for five seats and CI.

More collections

UK tax, payroll and HMRC rules — 2026/27 checksEU rules with a 2026 date — deadline and fine checksE-invoicing rules — format and deadline checksPrivacy and data protection — rule checksAccessibility — WCAG and EAA checksSecurity and supply chain — linters for the rules that bind softwareDeveloper deadlines — deprecations, removed APIs and build breaksSelling online — pricing, fee, email and consumer-law rulesAI rules and agent configuration — lintersSubmission gates — pass the store or registry review the first timeHealth and medical software — regulatory checksTemplates and design assetsDeutschland 2026 – Fristen, Lohn, Steuer und Pflichten2026年の申告・インボイス・社会保険 チェッカーとテンプレート All tools