You can have the IRS figure your tax on Form 1040EZ, Form 1040A or Form 1040 if you file your return by April 15, 2009. If you paid too much, the IRS will send you a refund. If you did not pay enough, the IRS will send you a bill for the balance. To avoid interest or the penalty for late payment, you must pay the bill within 30 days of the date of the bill or by the due date for your return, whichever is later.
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