OBBBA Calc calculates the new US federal tax deductions created by the One Big Beautiful Bill Act for tax years 2025 to 2028: overtime premium, tips and car loan interest, plus the changed 1099 reporting thresholds. It exists because the headline versions of these deductions are widely misunderstood, and the IRS rules behind them are exact.
Every rule used here is kept in a written register sourced to IRS forms, fact sheets and regulations, and every calculator is tested against examples worked by hand from those documents. The site is an estimator and an explainer, not a tax adviser.
The site is written and maintained by Syed. See the methodology page for how content here is produced and checked.