I will be filing my Federal return by mail. I will be paying my amount due online (in my IRS account).
1. Do I include a 1040-V with my mailed return?
2. Do I include anything with my mailed return (to notify the IRS that I paid online)?
No, you do not need to notify the IRS that you paid online. Use the link below to make your payment. You can schedule the payment date.
If you want to include the 1040-V you can simply write on it 'Paid Online' to give an indicator but it's not necessary. They will connect the payment with your tax return.
No. and No.