The IRS is not likely to question the timing of events but you should keep statements that show the dates of the transfers.
Betterment is correct that it is not a taxable event ( most trustee-to-trustee transfers are not taxable), but it certainly is a reportable event and must be reported on your tax return with a 1099-R.
**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.**
