After you file

@Bourqdm What do you mean they will charge you interest on your "non payment?"   Do you owe tax due or are you getting a refund?   If you owe tax due you were supposed to pay it by the filing deadline.    If you are getting a refund they will PAY interest to you on that refund if it has taken too long for them to process your return.  You do not "charge" the IRS---it will be automatic.

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