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W-4 Step 4(c) Masterclass

How Much Extra Tax Should You Withhold on Line 4(c)?

Master Step 4(c) per-paycheck extra withholding with simple 8th-grade math examples and automated 2026 calculations.

Quick Direct Answer (Featured Snippet)

To calculate Line 4(c) extra withholding, take your projected annual tax shortfall (e.g., $1,300) and divide it by the number of paychecks remaining in the tax year (e.g., 26 biweekly paychecks). Enter the result ($50) on Step 4(c) of your W-4.

✓Reviewed by Tax Experts & Enrolled Agents · Updated for Tax Year 2026
IRS Form W-4 (2026) ↗·IRS Pub 15-T ↗·IRS Topic 306 ↗

Critical Rule: Line 4(c) Is PER PAYCHECK

The single biggest mistake taxpayers make on Form W-4 is entering an annual tax deficit directly into Line 4(c). Line 4(c) is an amount per pay period. If you owe $2,400 for the year and have 24 paychecks left, enter $100 per paycheck — NOT $2,400!

When Should You Use Step 4(c)?

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