PiggyTax Constants 2026
2026 is the working tax year. 2027 inflation items that IRS/SSA have not published yet are listed as unpublished — we do not invent them.
Last updated: August 14, 2026
Every scalar below is stored in data/tax-constants-2026.json
with value, source, source_url, and effective_from.
Calculator runtime still reads the mirrored values in assets/app.js;
node tools/verify_tax_constants.mjs fails the check if they drift.
Loading sourced constants…
Primary publications
- IRS Rev. Proc. 2025-32 — 2026 inflation adjustments
- SSA 2026 contribution and benefit base
- IRS Rev. Proc. 2025-25 — PTC applicable percentages
Inline examples (hydrated from JSON)
- Social Security wage base: $184,500
- Standard deduction: $16,100 single / MFS · $24,150 HoH · $32,200 MFJ
- SE net-earnings factor: 92.35%
- Mileage H1 / H2: 72.5¢ → 76¢
- Solo 401(k) elective deferral: $24,500
Full constant table
Values below are rendered from the JSON file in your browser. If JavaScript is off, open the raw JSON.
| Key | Value | Status | Source | Effective | app.js path |
|---|---|---|---|---|---|
| Loading… | |||||
How we dual-check calculator math: Methodology. Who publishes these tools: About.