Read the W-4 instructions carefully and thoroughly. It tells you what to do. (All 4 pages, not just the front page you turn into your employer.) You go through the instructions one time for both of you, and it will recommend how many allowances to claim on each W-4, and then you each file a new W-4 based on the result of the worksheets. Under the new method, you need to coordinate your w-4s when both spouses work or one person has more than one job.
