One helpful tool is to use the IRS Tax Withholding Estimator to enter your information. Be sure to take into account the remaining pay periods you have left in 2025 when making adjustment mid-year. When completing the W-4, complete Step 2 of the Form W4 instructions to account for a working spouse. Underwithholding can occur if both spouses enter Married Filing Joint filing status in Step 1 and fail to complete Step 2.
