Yes, you can select pay by check, but then pay online using the IRS website. When you pay online, you need to tell the IRS who you are and what the payment is for.
Answer the questions to pay your 2021 tax due:
- Reason - Balance due
- Apply payment to - Income tax 1040
- Tax period for payment - 2021
- Verify your identity by providing personal information as it appeared on your last tax return.
- Continue,
- Provide your payment information and authorize payment.
That is all that is needed to match your payment with your tax account and your return. It doesn't matter if you pay first then file, or the other way around, as long as both are done by April 18.
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