Curated by: Rubric Advisors
Tax Planning
Tax Withholding and the W-4
How the redesigned W-4 works, completing each step, adjusting for life events, why large refunds are costly, and how to get your withholding right.
Tax Withholding and the W-4
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How the Redesigned W-4 Works
- The W-4 was redesigned in 2020, it no longer uses allowances or personal exemptions
- The new form uses actual dollar amounts for income, deductions, and credits instead
- Your employer uses the W-4 to determine how much federal income tax to withhold
- You can submit a new W-4 at any time, there is no limit on how often you update it
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Full Guide
How the Redesigned W-4 Works
- The W-4 was redesigned in 2020, it no longer uses allowances or personal exemptions
- The new form uses actual dollar amounts for income, deductions, and credits instead
- Your employer uses the W-4 to determine how much federal income tax to withhold
- You can submit a new W-4 at any time, there is no limit on how often you update it
Completing the W-4, Step by Step
- Step 1: Enter your filing status, single, married filing jointly, or head of household
- Step 2: Account for multiple jobs or a working spouse using the worksheet or estimator
- Step 3: Claim dependent tax credits, $2,000 per child and $500 per other dependent
- Steps 4-5: Enter other income, deductions above standard amount, and extra withholding
Multiple Jobs and Working Spouses
- If you hold two jobs or both spouses work, withholding from each job alone may be too low
- The IRS Tax Withholding Estimator at irs.gov is the most accurate tool for this
- Only one W-4 should claim dependents and deductions to avoid under-withholding
- Checking the Step 2 checkbox is simpler but less precise than using the worksheet
Why Large Refunds Are Costly
- A large refund means you overpaid taxes all year, an interest-free loan to the IRS
- A $3,000 refund is roughly $250/month that could have been saved or invested instead
- The IRS does not pay interest on overpayments until the refund is significantly delayed
- The goal is to break even or owe a small amount, not to maximize your refund
Adjusting After Life Events
- Marriage or divorce changes filing status and standard deduction, update your W-4
- A new baby adds a $2,000 child tax credit, adjust Step 3 to reduce withholding
- Buying a home may increase deductions if you itemize mortgage interest and property tax
- Job changes, raises, bonuses, and side income all affect whether withholding is on track
W-4 vs Estimated Tax Payments
- W-4 withholding covers wages; estimated payments cover self-employment and investment income
- Estimated payments are due quarterly: April 15, June 15, September 15, and January 15
- You can use extra W-4 withholding (Step 4c) instead of estimated payments for non-wage income
- W-4 withholding is treated as paid evenly all year, even if adjusted late in the year
Common Mistakes and Special Situations
- Claiming exempt when you expect to owe tax stops all withholding and causes a large bill
- Both spouses claiming full dependents on separate W-4s doubles credits incorrectly
- Retirees use Form W-4P for pension withholding; Form W-4V for Social Security
- Aim to owe less than $1,000 at filing to avoid underpayment penalties in most cases
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