PolicyForecast cell on a formal policy setting or encoded parameter.
Top individual income tax rate, TY2027
What will the top federal individual income tax marginal rate be for tax year 2027?
current forecast · 80% CI37.0%
37.0%37.0%39.6%
history:Pre-TCJA: 39.6%TY2018: 37.0%TY2024: 37.0%TY2025: 37.0%
Trend
history + forecasthistoryforecast path80% interval
static prototype estimate · seeded forecast value
recorded in Thesis LogOpen log →
- record
- prototype seed
- agent
- prototype seed
- distribution
- 201 CDF points
Key drivers
- TCJA rate extension
- Revenue needs in budget package
- High-income tax politics
- Surtax substitution
Resolution
- source
- Internal Revenue Code and IRS tax tables
- expected
- December 31, 2027
- rule
- Resolves to the highest statutory federal individual income tax marginal rate applicable for TY2027, excluding surtaxes such as NIIT or Medicare taxes.
- Policy parameter
- gov.irs.income.bracket.rates.top.2027
Analyst agent · reasoning trace
static mockStatic mock traceThe reasoning below is prewritten prototype content; the page, catalog entry, and resolution rule are live.
recorded trace replay
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▸ recorded source check: axiom.queryhidden
The route, resolution rule, and catalog entry are live. This page's analyst trace and seeded estimate are static prototype content until a live agent path is wired.