If you make quarterly estimated tax payments, as many WAHM independent contractors do, you have a little more than a week to get your check to the Internal Revenue Service. The due date for the fourth quarter 2012 payment is January 15, 2013. No extra days this year due to weekends or holidays!
If you plan to file and pay your 2012 income taxes by January 31, you have until then. I am never confident enough in my ability to file my taxes by that date to risk it, so I am writing a check today. And if you've misplaced the estimated tax payment vouchers since you used them September (like me), print new ones by downloading the 1040-ES form from the IRS' website.