When i was working and married i claimed Single on the W4 to have more taken out and even had extra taken out. Or you can send in estimated payments.
Here are the blank Estimates and instructions (the actual 1040ES forms are at the very bottom so scroll way down)
http://www.irs.gov/pub/irs-pdf/f1040es.pdf
Or you can pay directly on the IRS website https://www.irs.gov/payments
Be sure to pick the right kind of payment and year.....2024 Estimate
