Hi!
Both you and your spouse will have to complete the Form W-4 with your individual payroll departments. If you want to get a better idea about how you can best withhold from each of you, try using a W-4 Calculator tool. This will give you a good estimate of the total withholding needed and a way to plan for how much you should each withhold. Periodically, you should check your year-to-day withholding on your pay statements to see if adjustments are needed.