If  you make estimated tax payments to the IRS or your state, the last estimated tax quarterly voucher has to be paid by January 15, 2016 to be timely.  Make sure you check to see if there was an estimate due when you roughed out what you thought you would owe in 2015 (or if you paid in an amount based on 2014 taxes) and pay this by the due date to avoid any underpayment penalties.  If your income has increased dramatically you may want to add to the January payment to minimize any potential penalties.  Check with your preparer if you are not sure or just have questions about this.

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