Independent
Not affiliated with the IRS or any tax prep chain.
Federal tax estimates
Federal tax estimates you can verify.
Free calculators and planning tools built from IRS publications.
- Federal rules from IRS publications
- Federal estimate only
- No signup required
- Runs locally in your browser
Featured calculators
Eight free tools for self-employment, quarterly payments, entity comparisons, HSA savings, and employment scenarios.
Popular paths: Self-employed tax · Quarterly payments · 1099 contractor tax · LLC vs S Corp
Featured article
Self Employment Tax Explained
A federal-only overview of self-employment tax: what it funds, who it generally applies to, and how it differs from employee FICA withholding.
2 min read · 2026-06-16 · Self Employment
Latest resources
Guides and reference articles from IRS publications for self-employment, quarterly payments, and federal tax planning.
Start with: Self-employment tax guide · Quarterly due dates · 2025 tax brackets
Why TaxChecker
Built for planning clarity—not filing returns or replacing a CPA.
IRS Documentation
Federal constants traced to IRS publications and forms.
Planning Focused
Planning estimates — not individualized tax advice.
Methodology
How estimates are built—and what they intentionally omit.
- 1
IRS documentation
Constants come from IRS publications, forms, and revenue procedures.
- 2
Annual updates
Each calculator shows its tax year and last reviewed date.
- 3
Known exclusions
State taxes, many credits, AMT, and complex return items are out of scope.
- 4
Estimate-only philosophy
Results are planning estimates—review with a tax professional before filing.
Estimates only — not tax advice, legal advice, or financial advice. TaxChecker is not affiliated with the IRS. Consult a qualified tax professional for your situation.