What PaycheckAtlas Is
PaycheckAtlas is a free collection of 50 financial calculators covering personal taxes, paychecks, retirement savings, home and debt planning, salary decisions, small business finances, and investing. Every tool on the site is free to use, requires no account or signup, and runs entirely in your browser — nothing you enter is stored or transmitted anywhere.
The site exists because most financial calculators available online are either embedded inside a bank’s marketing funnel, built on outdated tax data, or so simplified they produce answers that don’t reflect how taxes and financial formulas actually work. PaycheckAtlas is an attempt to do it properly: tools that use current IRS rules, real financial formulas, and plain-language explanations that don’t assume any prior financial knowledge.
Every calculator on this site is built and maintained by me, William Turner. I research each tool’s underlying methodology against primary sources — IRS publications, SSA guidelines, lender underwriting standards, and relevant tax code — and update the site as rules change. The 2026 tools on this site reflect current federal tax brackets, contribution limits, and IRS rates as of the current tax year.
Editorial Principles
How We Build and Verify Each Calculator
Each calculator on PaycheckAtlas is built against a documented methodology. Before any tool is published, the underlying formula is cross-referenced against at least two primary sources. For tax calculators, this means the relevant IRS publication and the actual tax code section. For financial planning tools, this means standard financial formulas verified against textbook definitions and professional financial planning references.
| Calculator Type | Primary Sources Used |
|---|---|
| Federal income tax calculators | IRS Rev. Proc. (annual inflation adjustments), IRC §1 (tax rate schedules), IRS Publication 505 |
| State income tax calculators | Individual state Department of Revenue publications, Tax Foundation annual state tax data |
| FICA / payroll tax calculators | IRS Publication 15 (Employer’s Tax Guide), SSA wage base announcements |
| Retirement contribution calculators | IRS Notice (annual retirement plan limits), IRC §401(k), IRS Publication 590-A |
| HSA calculators | IRS Rev. Proc. (annual HSA limits), IRC §223, IRS Publication 969 |
| RMD calculators | IRS Publication 590-B, SECURE 2.0 Act (P.L. 117-328), IRS Uniform Lifetime Table |
| Mortgage and lending calculators | Standard amortization formulas, Fannie Mae/Freddie Mac DTI guidelines |
| Small business deduction calculators | IRS Publication 463 (business expenses), IRS Publication 587 (home office), IRC §162 |
What PaycheckAtlas Is Not
PaycheckAtlas does not sell financial products, provide investment recommendations, or receive compensation from financial institutions. The site is supported by advertising. No advertiser influences the content, methodology, or results of any calculator on this site.
A Note on Scope and Limitations
The calculators on this site are designed for the most common financial situations faced by individual Americans and small business owners. They handle the standard cases well. They are not designed for highly complex situations — multiple states, significant investment income, business entities with unusual structures, non-resident or expatriate tax situations, or estate planning. In those cases, the tools may still provide useful ballpark figures, but professional guidance is strongly recommended.
Some calculators use approximations where exact calculation would require information that varies by individual (such as state-specific tax credits, local income taxes, or employer-specific benefit structures). Where approximations are used, the relevant calculator’s methodology section notes this explicitly.
Updates and Corrections
Tax law and financial regulations change. When the IRS publishes new inflation adjustments, when Congress passes legislation affecting tax rates or contribution limits, or when I identify an error in any calculator’s methodology, the affected tools are updated as quickly as possible. If you believe a calculator on this site contains an error, I encourage you to use the contact form — verified corrections are addressed promptly and I’m grateful for readers who take the time to flag them.
The most recent significant update to the site was the incorporation of 2026 tax data reflecting the One Big Beautiful Bill Act, including updated federal brackets, standard deduction amounts, and contribution limits across all relevant calculators.
Have a question about a calculator, spotted a potential error, or want to share feedback? Use the form below to get in touch. Every message is read and calculator-related questions and corrections receive priority responses.
Response time: Most messages receive a response within 2–3 business days. Correction reports and questions about specific calculator results are typically addressed within 1 business day.
What to include
If you’re writing about a specific calculator, please include the name of the calculator and a brief description of what you entered and what result you received (or expected to receive). This helps significantly in diagnosing any issues quickly.
If you believe you’ve found an error in a calculator’s methodology or results, please include the specific inputs you used and, if possible, a reference source for the correct figure. Verified corrections are incorporated promptly and credited in the site’s update log.
Press and media
PaycheckAtlas calculators and data are available for reference in editorial coverage. For permission to reproduce calculator outputs, methodology documentation, or data citations, please use the contact form and select “Media or press inquiry” from the subject dropdown.