* January 17 – Final 2011 individual estimated tax payment is due, unless your 2011 tax return is filed and taxes are paid in full by January 31, 2012.
* January 17 – Due date for calendar-year trusts and estates to pay final installment of 2011 estimated tax.
* January 31 – Employers must furnish employees with W-2 statements for 2011. 1099 information statements for 2011 must be furnished by payers. (Deadline for 1099-B and consolidated statements is February 15.)
* January 31 – Employers must generally file 2011 federal unemployment tax returns and pay any tax due.