The IRS does not acknowledge receipt of 8606 forms at all - that is why you need your proof of mailing - and keep it all. If you use the non-deductible contribution to offset tax in the future, the IRS can match it with your prior filed 8606's - that is usually 2-3 years after the fact.
**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.**
