Resource hub
All Resources
Guides, quarterly deadlines, tax bracket references, and methodology articles maintained and reviewed regularly. Each resource cites IRS publications and the current federal tax year where applicable.
Guides
Who pays quarterly federal estimated tax, safe harbor rules, and how Form 1040-ES payments fit annual filing. Planning guide from IRS publications—not tax advice.
- Reading time
- 9 min read
- Last reviewed
- Last reviewed 2026-06-16
- Tax year
- Tax year 2025
Guides
How 2025 self-employment tax works: Schedule SE net earnings, Social Security wage base, and Medicare rates for freelancers. Planning guide—not tax advice.
- Reading time
- 10 min read
- Last reviewed
- Last reviewed 2026-06-16
- Tax year
- Tax year 2025
Deadlines
2025 Form 1040-ES estimated tax due dates with weekend and holiday adjustments plus safe harbor overview. Federal deadline reference—not tax advice.
- Reading time
- 4 min read
- Last reviewed
- Last reviewed 2026-06-16
- Tax year
- Tax year 2025
Tax Brackets
2025 federal income tax bracket table by filing status from IRS Revenue Procedure 2024-40. Reference rates used in TaxChecker calculators—not tax advice.
- Reading time
- 5 min read
- Last reviewed
- Last reviewed 2026-06-16
- Tax year
- Tax year 2025
Methodology
Internal methodology reference: IRS sources, formulas, exclusions & review dates behind TaxChecker federal estimates. Companion to the public methodology page.
- Reading time
- 6 min read
- Last reviewed
- Last reviewed 2026-06-16
- Tax year
- Tax year 2025