Why your last paycheck of the year may be bigger than your first
If you earn more than about $185,000 in a calendar year, your last few paychecks of 2026 will land bigger than the rest. Not because of a raise. Not because of a bonus. Because the 6.2% Social Security tax shut off mid-year, and your gross-to-net math changed.
The Social Security wage base
Social Security tax is 6.2% of your wages — but only up to an annual cap. The cap is called the Social Security wage base, and it goes up almost every year. The 2026 wage base is $184,500. The 2025 wage base was $176,100. The Social Security Administration publishes the new number each October for the following year.
Once your year-to-date Social Security taxable wages cross that cap, your employer stops withholding the 6.2%. Medicare keeps going (1.45% on all wages, plus an additional 0.9% on YTD wages above $200,000), but Social Security shuts off until January resets the counter.
What changes on the paycheck where you cross
The crossover paycheck is partial. Your employer withholds Social Security only on the portion of your wages that fits under the cap. If you cross at $184,500 and your gross for that period takes you to $187,000, you owe Social Security on $1,500 of that paycheck and zero on the other $185 (rounding-friendly numbers — the real math uses your specific YTD).
Every paycheck after that is bigger by 6.2% of gross. On a $7,000 biweekly gross, that is roughly $434 extra in your bank account every payday for the rest of the year.
Why this matters for variable-pay workers
For salaried workers with predictable pay, the Social Security cap hits roughly the same paycheck every year. For hourly, shift, overtime-heavy, or bonus-eligible workers, the timing moves around. A bonus in October pushes you over earlier. A slow shift quarter pushes the crossover to December.
Two practical implications. First: if you set your savings rate as a percent of net pay, the post-cap paychecks throw off that math — you have more disposable income than your earlier-year baseline. Second: if you have a year-end shift planning conversation with your employer or a CBA, knowing whether you have crossed the cap or not changes the take-home math on incremental hours.
How to know where you are
Your pay stub shows YTD Social Security taxable wages — sometimes labeled as "OASDI", "FICA-OASDI", or just "Social Security wages". Compare that number against the 2026 wage base ($184,500). If you are within about one paycheck of crossing, the next stub will likely show partial withholding and the one after that will show zero Social Security tax.
TakeHome IQ tracks your YTD Social Security wages explicitly when you provide them, so the cap and the post-cap paycheck size are projected correctly in your next-paycheck forecast and any what-if scenarios you run.
The Additional Medicare 0.9% surcharge
A separate threshold to know about: the Additional Medicare tax of 0.9% kicks in on YTD Medicare wages above $200,000 (single, head of household, qualifying widow). Married filing jointly threshold is $250,000 for the joint return, but employers withhold based on $200,000 per individual W-2 regardless of marital status — your filing-time return reconciles.
Unlike Social Security, this one only goes up after the threshold (not down). So if you cross both Social Security and Additional Medicare in the same calendar year, your December paycheck nets out: Social Security saves you 6.2%, Additional Medicare costs you 0.9%, net plus 5.3% on every gross dollar above the cap.
Once your YTD Social Security wages cross the cap, the 6.2% withholding stops — and every subsequent paycheck is bigger by 6.2% of gross.