How Write A Check Payabe To California Income Tax . Whether to withhold at the single rate or married rate. Your federal withholdings will also include 1.45 percent for medicare, which is also matched by your employer for a total of 2.9 percent. How to Endorse and Write Checks to Multiple People from www.thebalance.com You should make sure your check includes your name and address, a phone number where you can be reached during the day, your social security number or other taxpayer identification number, as well as the tax year and tax form with which your payment should be associated. It is used for reporting purposes only. For example, if you earned $50,000 in 2021, you could only deduct expenses above $3,750 (7.5 percent of $50,000).