| Jan 15
|| Those paying quarterly estimated taxes must make a IV quarter of 2012 payment.
| Jan 31
|| Employers must file Form W-2 for employees and Form 1099 for contractors, interest, dividends and other miscellaneous payouts.
| Feb 15
|| Employees wanting to change tax withholding and exemptions must submit a new Form W-4 to their employer. The earlier in the year this form is submitted, the sooner correct amount will be withheld from your income.
| Mar 15
|| U.S. Corporations must file taxes on Form 1120 or 1120-S. A six-month extension may be requested, but any taxes owed must be paid to avoid penalties and interest.
Foreign trusts with the U.S. owner filing on the calendar year must file form 3520A. A six-month extension may be requested.
| Apr 15
|| Final date to file amended tax return for a full refund from 2009. Refunds requested after this date will be forfeited due to the statute of limitations.
If you are making quarterly estimated tax payment for 2013, the first payment is due.