Any penalties and interest for the late payment of the taxes owed and the late filing of the tax return will be calculated by the IRS once the IRS has received the tax return and payment for the taxes owed. The IRS will send you a bill in the mail to pay the penalties and interest.
Penalties and interest are not entered on a tax return nor are they deductible on a tax return.
There is no penalty for filing after the due date if the return is being filed for a tax refund.
