Always make payments to the IRS directly on their website so you have instant confirmation that they’ve been paid and posted to your account. If you made a payment and they are not posting it correctly all you have to do is send proof of payment back with the notice that they sent you and or call the number on the notice to discuss the missed payment.
If you do mail in payments with any vouchers then the information must be put on the check as well so in case the check gets separated from the voucher at the IRS your name and Social Security number and the reason for the payment are clearly posted on the check in the memo section so I can correctly be posted to your account properly.
