Step 3 on Form W-4 is the credit line. Payroll subtracts the annual dollar amount you type from the Pub 15-T tentative tax, then divides by paydays. It is not Step 2 (two jobs). It is not Step 4 (other income, deductions, extra cash).
Single, $2,000 biweekly, Step 2 off:
- Step 3 empty: FIT $195.85, net $1,651.15
- Step 3 $2,000: FIT $118.92, net $1,728.08
- Step 3 $4,000: FIT $42.00
FICA stays $153.00. Credits do not touch Social Security or Medicare.
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Use the amount the current Form W-4 worksheet tells you to enter on Step 3. This page does not republish the Child Tax Credit statute. $2,000 and $4,000 below are worksheet entries, so you can see the lever. Estimate, not tax advice.
Direct answer: $2,000 on Step 3 → $118.92 FIT
- Tentative annual FIT on $52,000 single = $5,092
- Minus Step 3 $2,000 = $3,092
- This check = $3,092 ÷ 26 = $118.92
- FICA still $153.00
- Net = $2,000 − $118.92 − $153.00 = $1,728.08
period FIT = max(0, tentative annual FIT − Step 3 credits) ÷ paydays
Publication 15-T will not let the credit drive withholding below zero. $6,000 of Step 3 on this $5,092 tentative would withhold $0 federal income tax, not a refund on the stub.
Checks you can re-run
| Step 3 (annual) | FIT this check | Annual FIT | Net (paycheck engine) |
|---|---|---|---|
| $0 | $195.85 | $5,092 | $1,651.15 |
| $2,000 | $118.92 | $3,092 | $1,728.08 |
| $4,000 | $42.00 | $1,092 | $1,805.00 |
$4,000 net = $2,000 − $42.00 − $153.00 = $1,805.00. Same FICA.
Wrong lever, common mix-ups
- Two W-2 jobs: start with W-4 Step 2, not a bigger Step 3.
- Side 1099 income: that is Step 4(a) or estimated tax, not a dependent credit. W-4 Step 4.
- You want a smaller refund, no dependents: extra cash on Step 4(c) is the honest lever. $25 extra on $52,000 single is $220.85 FIT.
- Married, both work: the MFJ table is a different schedule. Married both work.
No. On $2,000 the FICA line stays $153.00. Only FIT moves.
$2,000 ÷ 26 = $76.92. $195.85 − $76.92 = $118.93, one cent off the engine because the credit is subtracted from the annual tentative ($5,092 − $2,000 = $3,092) and then divided. $3,092 ÷ 26 = $118.92.
No. Step 3 only changes withholding. The return still computes credits from the actual return. A fat Step 3 can leave you short in April if the credit does not survive the 1040.
About Form W-4 · Publication 15-T Worksheet 1A