About WattFlow

WattFlow makes small, free tools that run in your browser. The tax calculators on this site cover the federal no tax on tips and no tax on overtime deductions created by Public Law 119-21 for tax years 2025–2028.

Where the rules come from

Every rule and number comes from IRS or Treasury documents: Schedule 1-A, the Form W-2 instructions, IRS fact sheets and notices, and Rev. Proc. 2025-32 for the 2026 tax tables. Each page lists its sources and a changelog.

Who writes this

The pages are maintained by the WattFlow team. We are not a CPA firm, and no enrolled agent or CPA has reviewed these pages. The calculators give estimates, not tax advice.

Updates

When the IRS publishes a new form or changes its guidance, we update the affected pages within 48 hours and note it in the page changelog.