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  3. Why am I charged interest when I had an extension to file?

Why am I charged interest when I had an extension to file?

An extension of time to file your return does not extend the time to pay.  Interest accrues on income tax that is not paid on or before the due date. If you expect to owe more tax when you file your return, you should make a payment online or by mail, using a payment voucher and avoid the accrual of interest on that amount.

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