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tax-data

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2026 US federal tax and retirement figures as plain JSON: income tax brackets, standard deductions, 401(k)/IRA/HSA/FSA limits, IRA phase-outs, Social Security, Medicare IRMAA and RMD ages. Every section cited to its IRS/SSA/CMS source. No API key, no dependencies.

  • Updated Jul 28, 2026
  • JavaScript

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