Tax Calculator

Business Retirement Contributions

Find your maximum deductible retirement contribution for 2025 — and see how much it reduces your tax bill this year.

$70,000

2025 maximum contribution (SEP-IRA / Solo 401k)

37%

Maximum marginal rate avoided on each dollar contributed

April 15

Deadline to fund SEP-IRA for prior tax year (with extension)

Business Structure & Plan Type

Entity Type

Retirement Account Type

SEP-IRA

Up to 25% of compensation, max $70,000 (2025). Employer contributions only — no employee deferrals. Simplest to set up.

Best for: Sole proprietors and self-employed with high income and no employees.

Net Self-Employment Income

Schedule C net profit (after expenses, before SE tax deduction)

Your Age

Age 50+ qualifies for catch-up contributions

Filing Status

Used to estimate your marginal tax rate