April 2 – Electronic Filing of Forms 1098, 1099 and W-2G
If you file forms 1098, 1099, or W-2G electronically with the IRS, this is the final due date. This due date applies only if you file electronically (not paper forms). Otherwise, February 28 was the due date. The due date for giving the recipient these forms was January 31.
April 17 – Social Security, Medicare and Withheld Income Tax
If the monthly deposit rule applies, deposit the tax for payments in March.
April 17 – Non-Payroll Withholding
If the monthly deposit rule applies, deposit the tax for payments in March.
April 17 – Corporations
The first installment of 2012 estimated tax of a calendar year corporation is due.
April 17 – Partnerships
File a 2011-calendar year return (Form 1065). Provide each partner with a copy of Schedule K-1 (Form 1065), Partner’s Share of Income, Deductions, Credits, etc., or a substitute Schedule K-1. If you want an automatic 5-month extension of time to file the return and provide Schedules K-1 or a substitute Schedules K-1 to the partners, file Form 7004. Then, file Form 1065 and provide the K-1s to the partners by September 15.