Should I use Step 2 of the W-4 after I get married?

If both spouses work, yes. Step 2 prevents under-withholding when two incomes combine into one MFJ tax return. The IRS Tax Withholding Estimator at irs.gov is the easiest way to dial it in.

What is the marriage penalty?

When two roughly equal high earners pay more federal tax filing MFJ than they would have as two singles. The penalty kicks in at upper brackets where MFJ thresholds are less than 2x single.

Usually no. MFS disqualifies several credits and deductions. Specific reasons (e.g., separating liability, income-based student loan repayment) can justify it. Talk to a CPA.

Single vs Married Filing Jointly on Your Paycheck

Marriage changes federal withholding because the tax brackets and standard deduction are different. Understanding the difference avoids over- or under-withholding when you tell payroll you got married (or divorced).

PayslipIQ provides educational information and estimated calculations only. It does not provide tax, legal, financial, accounting, employment, benefits, or payroll advice. PayslipIQ is not a CPA firm, law firm, financial advisor, payroll provider, or tax authority. Always verify your paycheck, deductions, withholdings, and tax position with your employer's payroll department, a qualified CPA, the IRS, your state tax authority, or another appropriately qualified professional. Calculations are estimates; your actual paycheck may differ based on factors specific to your employer, location, benefits elections, and personal tax situation.

Standard deduction comparison

For 2026, the federal standard deduction is approximately $15,000 for single filers and $30,000 for married filing jointly. Verify current numbers at irs.gov.

Tax brackets

MFJ brackets are wider than single brackets at every level. So the same income that puts a single filer in the 24 percent bracket may keep an MFJ filer in the 12 percent bracket.

What happens at the paycheck

If you change your W-4 from single to MFJ, your employer's federal withholding drops because the wider brackets apply. If both spouses work, this can lead to under-withholding overall, which is why W-4 Step 2 (multiple jobs) exists. Use the IRS Tax Withholding Estimator after a marriage to recheck.

The marriage bonus and penalty

If one spouse earns most of the income, MFJ usually saves tax versus filing single (the marriage bonus). If both earn similar high incomes, MFJ can cost more than two single filings would have (the marriage penalty). The split point depends on income levels and the year's brackets.

Married Filing Separately

MFS is a third option. It uses brackets similar to single (sometimes worse) and disqualifies several deductions and credits. Rarely advantageous, but can make sense in specific cases (e.g., separating tax liabilities, income-based student loan repayment).

Frequently asked questions

Should I use Step 2 of the W-4 after I get married?: If both spouses work, yes. Step 2 prevents under-withholding when two incomes combine into one MFJ tax return. The IRS Tax Withholding Estimator at irs.gov is the easiest way to dial it in.
What is the marriage penalty?: When two roughly equal high earners pay more federal tax filing MFJ than they would have as two singles. The penalty kicks in at upper brackets where MFJ thresholds are less than 2x single.
Should I file MFS?: Usually no. MFS disqualifies several credits and deductions. Specific reasons (e.g., separating liability, income-based student loan repayment) can justify it. Talk to a CPA.