The IRS does not acknowledge the receipt of the form. The only way to know that they received it is to use mail with tracking.
You will only hear from the IRS when they send the additional refund, about 14 weeks after they receive it (possibly longer this busy time of year with an understaffed IRS).
Mailing a 2nd form might delay things even more if both forms get into the system and have to be sorted out by hand.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
