| Yes, you can pay the balance of the taxes on January 15th 2008, or you could pay the balance of your tax liability on April 15, 2008. The important thing to remember is that you should try and avoid the underpayment penalties and interest.
Always try and pay at least 110% of prior years tax liability to avoid the underpayment penalty and interest. You may accomplish this by increasing your withholding or paying estimated tax payments during the year! | 
