How to report after tax 401k rollover to roth IRA? I did not receive 1099R. I only got form 5498. How should I report it and convert it to form 8606?

[macuser_22]

When did the rollover occur?   If in 2019 the 401(k) administrator was required to issue a 1099-R no later then Jan 1, 2020.   Contact the plan administrator for a copy.

If this was a regular 401(k) containing before tax money and not a designated Roth, then the conversion to a Roth will be taxable income.

A 5498 is information only and does not get reported anywhere.

A 401(k) rollover does not require a 8606.