# If you're a retiree trying to figure out your real tax bill for 2026, the bra...
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Author: Dr. Ed - Former SSA Manager
Platform: facebook
## Content
If you're a retiree trying to figure out your real tax bill for 2026, the bracket table is only part of the story. The OBBBA gave the bottom two federal tax brackets a 4% inflation bump versus 2.3% for the higher brackets, so those lower-rate windows got a little wider. But phase-outs and surtaxes can push the real cost of the next dollar well above what the bracket suggests. Take IRMAA — that's the income-related Medicare premium surcharge. For a single filer with income just over $109,000, it adds about $1,148 per year in combined Part B and Part D surcharges. Then Social Security taxation phases in at 50% then 85% of your benefits, which can lift the effective rate inside the 12% bracket closer to 22%. I saw plenty of people surprised by that during my years at SSA. The OBBBA also has a senior deduction of $6,000 for taxpayers 65 and older, but it phases out at 6 cents per dollar over $75,000 single, adding to the marginal cost inside that range. On top of all that, the Net Investment Income Tax adds 3.8% on investment income for single filers with MAGI over $200,000. Roth conversions, IRA distributions, and large capital gains all interact with these thresholds, which is why the marginal-rate calculation is more granular for retirees than for wage earners. Bottom line: your next dollar might cost more than you think.