Tax Constants 2027 (preview)

Name: PiggyMath 2027 Federal Tax Constants (Preview)
Creator: PiggyMath
Published: 2026-10-23
License: https://piggymath.com/terms/

Working calculators still use 2026. This page records only cited official 2027 amounts plus statutory rates. Amounts not yet verified for this dataset stay blank.

Last updated: October 24, 2026

Preview, not a second calculator. SSA has published the official 2027 Social Security wage base: $192,300. Other blank inflation-adjusted amounts in this preview remain pending verification against IRS publications. PiggyMath will not invent those numbers. Use the 2026 SE tax calculator for live math. Sourced file: data/tax-constants-2027.json.

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Primary publications

Official 2027 amounts (already published)

Social Security wage base: $192,300 . This applies to 2027, not 2026.

HSA contribution limit: $4,500 self-only / $9,000 family
HDHP minimum deductible / OOP max: $1,750 / $8,700 self-only · $3,500 / $17,400 family
PTC required contribution (employer affordability): 10.22%
HHS 2026 FPL (governs 2027 coverage-year PTC): contiguous 1-person $15,960 + $5,680 per additional person

The live HSA calculator still runs 2026 limits ($4,400 / $8,750) so 2026 filing math does not silently change. A future 2027 calculator will use the corresponding official values.

Statutory rates that do not wait on a 2027 Rev. Proc.

SE net-earnings factor: 92.35%
Social Security + Medicare combined: 12.4% + 2.9% = 15.3%
Additional Medicare: 0.9% above $200,000 / $250,000 MFJ / $125,000 MFS (not inflation-indexed)
Schedule SE filing floor: $400

Those are the figures the 2027 SE tax preview can state using the official 2027 wage base.

Other amounts pending verification

“Not yet verified” describes this dataset’s review status. It does not establish whether the IRS has already released an amount. Check the official publication for the applicable tax year before relying on a figure.

Standard deduction: Not yet verified
Federal income-tax bracket dollar thresholds: Not yet verified
401(k) / IRA / QBI inflation amounts and 2027 mileage rates: not yet verified

The 2026 Trustees Report intermediate assumption lists a $190,200 2027 contribution and benefit base. That is a projection in Table V.C1, not the official CBB. It has been superseded by the official $192,300 amount and is retained only as historical context.

Full constant table

Rendered from the 2027 JSON. Null values display as “Not yet verified.” 2026 working list: Tax Constants 2026.

Key	Value	Status	Source	Effective	app.js path
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Frequently asked questions

Are 2027 IRS tax brackets published yet?

This dataset has not yet verified the final 2027 IRS brackets and standard deduction. Check the IRS annual inflation publications before using any projected amount. PiggyMath calculators continue to use 2026 figures from Rev. Proc. 2025-32.

Is the 2027 Social Security wage base official?

Yes. SSA lists $192,300 for 2027. The older $190,200 Trustees Report projection is not the official amount. The 2026 wage base remains $184,500.

Which 2027 tax figures are official today?

IRS Rev. Proc. 2026-24 set 2027 HSA limits ($4,500 self-only / $9,000 family) and HDHP deductible/OOP amounts. Rev. Proc. 2026-26 set 2027 premium-tax-credit applicable percentages. HHS published 2026 poverty guidelines that govern 2027 coverage-year PTC. Self-employment tax rates (15.3% on 92.35% of profit) are statutory and do not wait on inflation tables.

How we dual-check calculator math: Methodology. Who publishes these tools: About.