Each employer runs Pub 15-T on its paycheck as if that were your only job. Two W-2 jobs, both treating you as a $52,000 worker, under-withhold against a real $104,000 year.
Single, Step 2 off, no pre-tax deductions:
- Job A $1,000 weekly → FIT $97.92
- Job B $1,000 weekly → FIT $97.92
- Combined withheld: $195.84
- One job $2,000 weekly → FIT $306.58
Gap: $110.74 a week, $5,758 a year ($15,942 − $10,184).
Run the federal withholding calculator →
Check Step 2 on the form (or in the calculator) when you have two jobs, or you and a spouse both work. That is not the same lever as W-4 Step 4 extra withholding.
More United States paycheck, FICA, 401(k) and tax tools live on the United States calculators hub.
The IRS also publishes a Multiple Jobs Worksheet and the Tax Withholding Estimator. This page only shows what the in-repo percentage-method tables do with Step 2 on or off. Estimate, not tax advice.
Direct answer: $195.84 vs $306.58
- One $1,000 weekly job, Step 2 off: annualize $52,000 → $5,092 / 52 = $97.92
- Two of those jobs: $195.84 a week
- One $2,000 weekly job: annualize $104,000 → $15,942 / 52 = $306.58
each employer: annual wage = that job’s period wages × its paydays
it does not see the other W-2
Step 2 checkbox: use the higher-withholding (Step 2) schedule
Checks you can re-run
| Setup | Step 2 | FIT this week | Annual FIT target |
|---|---|---|---|
| One job $1,000 weekly | Off | $97.92 | $5,092 |
| Two jobs $1,000 + $1,000 | Off on both | $195.84 | $10,184 |
| One job $2,000 weekly | Off | $306.58 | $15,942 |
| One job $1,000 weekly | On | $135.10 | $7,025 |
| Two jobs $1,000 + $1,000 | On on both | $270.20 | $14,050 |
Step 2 on both $1,000 jobs gets you to $270.20 a week. That is closer to the one-job $2,000 figure of $306.58, still not identical. The IRS worksheet or a flat extra on W-4 Step 4(c) can close the rest.
On a single $2,000 biweekly job (same $52,000 year, one employer) FIT is $195.85. That is not the two-job problem. See federal withholding.
What this is not
- Not FICA. Each job still takes 6.2% + 1.45% on its own wages: FICA.
- Not the Form 1040 you file in April.
- Not “married filing jointly” math. The married tables are a different schedule in the same calculator.
If you use the checkbox method, the Form W-4 instructions say to check it on the W-4 for each job (or the higher-paying job, depending on the year’s form text). Confirm the current Form W-4. This engine just applies the Step 2 table when you toggle the box.
You can. $110.74 extra per week on one of the $1,000 jobs would match the one-job $2,000 withholding in this example. That is a Step 4(c) dollar amount, not Step 2.
No. 1099 pay is not a W-2 paycheck. Use estimated tax safe harbor or self-employment take-home.