Congress quietly narrows Medicare tax base for high earners
S. 5085 — A bill to amend the Internal Revenue Code of 1986 to apply inflation adjustments to the additional hospital insurance tax on high income taxpayers. · Filed by John Kennedy (R-LA) · Introduced Jul 22, 2026 · Referred to committee
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What it does
This bill indexes the income thresholds that trigger the additional 0.9% Medicare tax on high earners to inflation, starting in 2027. Currently, the tax applies to wages above $200,000 (single) or $250,000 (married filing jointly) — thresholds set in 2010 that have never been adjusted. The bill ties those thresholds to annual cost-of-living adjustments, so they rise with inflation each year, rounded to the nearest $1,000. High-income earners would pay the tax on a smaller portion of their income as thresholds climb.
Why we flagged it
The bill's operative mechanism is to reduce the effective tax burden on high-income earners by indexing Medicare tax thresholds to inflation. While framed as a technical adjustment, the effect is to narrow the tax base and reduce revenue to a public insurance program.
What the text implies
- Indexing thresholds to inflation beginning in 2027 means the additional Medicare tax will eventually apply to a smaller share of high-income earners' income, reducing the program's revenue stream without corresponding benefit expansions or cost controls.
- The rounding rule (to nearest $1,000) creates small administrative cliffs but also ensures thresholds do not drift downward, locking in the inflation adjustment mechanism permanently.
The full analysis lists 3 implications of this text.
Who stands to gain
high-income individual taxpayers (income above $200k single / $250k married); self-employed high-income individuals