Why is my January paycheck smaller?
If your pay didn't change but your first January paycheck is smaller, the usual reason is that something which stopped late last year starts again on January 1: Social Security for pay above the wage base, a state leave premium with a yearly cap, or 401(k) contributions that hit the limit. New tax tables, benefit premiums and a lapsed W-4 exemption can add to it.
1. Social Security starts again
Social Security takes 6.2% of pay only up to the yearly wage base — $184,500 for 2026. Earn more than that and it stops partway through the year, so your last paychecks of the year are bigger. On January 1 the count starts over.
| Salary | Social Security stopped at paycheck | Social Security back in January | Additional Medicare stops | Change per paycheck |
|---|---|---|---|---|
| $200,000 | 24 of 26 | $476.92 | — | −$476.92 |
| $250,000 | 20 of 26 | $596.15 | +$86.54 | −$509.62 |
| $300,000 | 16 of 26 | $715.38 | +$103.85 | −$611.54 |
| $400,000 | 12 of 26 | $953.85 | +$138.46 | −$815.38 |
Paid every two weeks. Additional Medicare (0.9%) is withheld only after the year's pay passes $200,000, so it's in a late-December paycheck but not in January's — a small offset. 2026 wage base; the 2027 base is announced by the Social Security Administration in the fall and this page is updated when it is.
2. State premiums with a yearly cap start again
Several states' payroll premiums stop once you've paid the year's maximum, then restart in January:
| State | Line on your stub | 2026 limit |
|---|---|---|
| New York | Paid Family Leave | stops after $411.91 a year |
| New Jersey | Disability (SDI) and family leave (FLI) | on the first $171,100 of wages |
| New Jersey | Unemployment and workforce | on the first $44,800 |
| Massachusetts | Paid Family & Medical Leave | on wages up to $184,500 |
| Washington | Paid Family & Medical Leave | on wages up to $184,500 |
| Colorado | FAMLI | on wages up to $184,500 |
| Oregon | Paid Leave Oregon | on wages up to $184,500 |
| Minnesota | Paid Leave | on wages up to $185,000 |
| Alaska | Unemployment insurance | on the first $54,200 |
Most of these premiums are small, but New York's family leave, for example, reaches its $411.91 maximum on a salary of about $96,000. See the pay stub checker for what each line should be.
3. 401(k) contributions start again
A percentage-of-pay 401(k) contribution stops once you reach the yearly limit — $24,500 for 2026 (plus $8,000 catch-up at 50 or older, $11,250 at ages 60–63). In January it restarts:
- $150,000 salary saving 20%: $1,153.85 a paycheck, which reached the limit at paycheck 22 of 26.
- $200,000 salary saving 15%: $1,153.85 a paycheck, which reached the limit at paycheck 22 of 26.
- $300,000 salary saving 10%: $1,153.85 a paycheck, which reached the limit at paycheck 22 of 26.
Your take-home falls by less than the contribution, because pre-tax 401(k) money also lowers your income tax.
4. New tax tables and rates
The IRS publishes new withholding tables for each year, and some states change their rates or tables on January 1. Changes we track, with dates, are on the payroll tax updates page. Our calculators switch to 2027 figures as soon as the IRS and states publish them.
5. Benefits, and a lapsed W-4 exemption
- Benefit premiums for health, dental and other plans often change with open enrollment and take effect in January.
- Exempt from withholding? An exemption claimed on a 2026 W-4 needs a new W-4 by February 16, 2027; if you don't renew it, your employer withholds as if you're single with no adjustments.
Check your own paycheck
Enter your pay in your state's paycheck calculator and open Check my pay stub to compare every line with the rules.
Sources
- IRS Publication 15-T (2026), Federal Income Tax Withholding Methods — Worksheet 1A and the annual percentage-method tables
- IRS Publication 15 (2026), Employer's Tax Guide — Social Security and Medicare rates
- Social Security Administration — 2026 wage base of $184,500
- IRS — tips and overtime deductions
- IRS — 401(k) limit increases to $24,500 for 2026 (IR-2025-111) — $24,500 deferral; $8,000 catch-up at 50+; $11,250 at 60–63
- IRS Form W-4 (2026) — exemption for 2026 expires; new W-4 by 2027-02-16
Questions
Why is my first paycheck of the year smaller?
Usually because Social Security (above $184,500 of pay), a capped state premium or 401(k) contributions stopped late last year and restarted on January 1. New tax tables and benefit premiums can also change it.
How much less will my January paycheck be?
If you earn over $184,500, about 6.2% of each paycheck comes back as Social Security — $596.15 every two weeks on $250,000.
Will my paycheck go back up later in the year?
If the drop is Social Security or a capped premium, yes — once your year's pay passes the limit again, those lines stop.