Two earners can each stay under the Medicare threshold and still owe 450 at filing
Published 2026-11-09 · updated 2026-11-09 · figures for tax year 2026
Medicare is the payroll tax with no wage cap, and above a threshold it stops being flat. The additional 0.9% applies to the amount above $200,000 for a single filer and $250,000 for a joint return. The two thresholds are far apart, and payroll applies one of them per payslip rather than per household — which is how two earners each stay under their own line and still owe the difference in April.
Where the extra rate starts, and what it does
| Gross / filing status | Medicare withheld | FICA total | Excess over threshold × 0.9% |
|---|---|---|---|
| 200,000 / single | $2,900 | $14,339 | — |
| 250,000 / single | $4,075 | $15,514 | $50,000 → $450 |
| 250,000 / joint | $3,625 | $15,064 | — |
| 300,000 / joint | $4,800 | $16,239 | $50,000 → $450 |
At $250,000 a single filer pays $4,075 of Medicare: $250,000 × 1.5% plus $50,000 × 0.9%. The same $250,000 filed jointly pays $3,625 — the household threshold has not been crossed, so the extra rate contributes nothing. Filing status alone moves the Medicare bill by $450.
The two-earner case that produces a bill
Two people each earning $150,000. Individually each pays $2,175 — $150,000 × 1.5%, with no additional rate, because neither crosses $200,000. Two payslips add up to $4,350 for the household.
A joint return measures the threshold against household wages. $300,000 minus $250,000 leaves $50,000 exposed to the extra 0.9%, so Medicare for the year is $4,800. The gap — $450 — was never withheld from either payslip.
Why neither payroll could have caught it
Withholding is computed per employer, per employee. Each payroll sees one W-4, one filing status, one wage base. It cannot see a spouse's wages, so it cannot see that the household crossed a line the individual did not. The on-payslip fix is an extra withholding amount on the W-4; the alternative is paying it with the return.
Where it sits next to the Social Security cap
At $300,000 both caps are in play. Social Security is fixed at $11,439 — the base, not the wage — while Medicare keeps growing and then grows faster. That is why the FICA total still rises above $184,500 even though one of its two halves has stopped: $16,239 of FICA at $300,000, of which $4,800 is Medicare.
Figures use the 2026 tables, single or joint as labelled, California, and the standard deduction. The additional rate is applied to the excess over each filing status's own threshold, which is what a return does — payroll withholding applies it per employee and reconciles later.
Put a number on it
The same mechanisms on an actual salary. Every figure here is computed by the engine that serves the calculators, so it matches the page it opens — nothing is copied.