Feb 05 What needs to go on my checks that I must send into the government? A What needs to go on my checks that I must send into the government? For Individual Returns Social Security Number Daytime phone number “20XX Form 1040” depending on the applicable year Make sure to include Form 1040-V with your check For Business Returns Some may have information on the filing instructions for electronic payment. SC will most likely need to be mailed in with a voucher that is provided. Permalink