January
Image via Wikipedia18 – Fourth quarter 2010 estimated tax due. Use Form 1040-ES.
31 – Deadline for employers to provide copies of Forms W-2 and 1099 for 2010 to employees.
February
15 – If you claimed exemption from income tax withholding last year on the Form W-4 you gave your employer, you must file a new Form W-4 by February 15 to continue your exemption for another year.
28 – Deadline for farmers and fishermen who have a balance due on their taxes to file their 2010 individual income tax returns and pay the balance due without penalties.
March
15 – Deadline for 2010 Naperville corporate tax returns (Forms 1120, 1120-A, and 1120-S) or to request an extension using Form 7004.
April
18 – Deadline to file 2010 Naperville individual income tax returns (Form 1040, 1040A, or 1040EZ) and any taxes owed, or to file for an automatic 6-month extension.
18 – Last day to contribute to a traditional IRA, Roth IRA, or SEP-IRA for the 2010 tax year.
18 – First quarter 2011 estimated tax due. Use Form 1040-ES.
18 – Deadline to file 2010 trust tax returns (Form 1041) or to request an automatic extension.
18 – Deadline to file 2010 partnership tax returns (Form 1065) or to request an automatic extension.
June
15 – Deadline for U.S. citizens living abroad to file individual tax returns and pay any tax, interest, and penalties due, or to request a 4-month extension (Form 4868).
15 – Second quarter 2011 estimated tax due. Use Form 1040-ES.
September
15 – Third quarter 2011 estimated tax due. Use Form 1040-ES.
October
1 – Deadline for existing employers to establish a SIMPLE IRA plan.
17 – If you were given a 6-month extension to file your income tax return for 2010, file Form 1040, 1040A, or 1040EZ and pay any tax, interest, and penalties due.
17 – Final deadline to file 2010 partnership tax return if you were given a 6-month extension.
