Social Security, Medicare, and withheld income tax. File Form 941 for the first quarter of 2016. Deposit any undeposited tax. (If your tax liability is less than $2,500, you can pay it in full with a timely filed return.) If you deposited the tax for the quarter in full and on time, you have until May 10 to file the return.
Federal unemployment tax. Deposit the tax owed through March if more than $500.