How do I calculate bonus depreciation? Bonus depreciation is 40% for property placed in service in 2025 under current phase-down. Enter your numbers above and the result updates instantly. For example: Qualified property cost: $100,000 · Bonus rate: 40% · Marginal tax rate: 30% → First-year bonus deduction: $40,000.
Is this Bonus Depreciation Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for bonus depreciation. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.