@uk05 The ONLY reason to report it now is to avoid the inconvenience of amending. Since you already filed then you should not amend until you have the actual 1099-R - there is no advantage to amend now whatsoever. Amended returns reguardless of how they are filed are currently taking about 6 months to process. The only tax is on the box 2a amount.
If between now and next year there is another reason to amend or if the actually 1099-R is different from what you expect then you would need to amend the amended return which can lead to many problems and delays.
**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.**
