For a long time, converting your traditional IRA to a Roth version was a fairly low-risk proposition. If you changed your mind at a later date, you could always reverse course. That ended with the tax bill former President Trump signed in December 2017. Daniel Kurt from Investopedia explains more.
The legislation abolished the option to “recharacterize” a Roth conversion back into a traditional, SEP, or SIMPLE IRA, beginning in the tax year 2018. It did the same for Roth IRA funds rolled over from 401(k) and 403(b) accounts. There was a brief window until Oct. 15, 2018, in which you could still undo a 2017 Roth conversion. Needless to say, the deadline has passed.