convert Roth IRA contribution to a tradtional IRA

[boynton]

If I convert part of my 2019 ROTH contribution to a Traditional IRA in 2020 (before I file taxes for 2019),

can that converted contribution be deducted on my 2019 taxes?

[dmertz]

You mean recharacterize, not convert.  Whether or not the resulting traditional IRA contribution for 2019 is deductible will depend on whether or not you or your spouse is covered by a workplace retirement plan, your filing status and your modified AGI for the purpose.

https://www.irs.gov/retirement-plans/ira-deduction-limits

[macuser_22]

I think you mean recharacterize (treat the Roth as a Traditional IRA contribution as if the Roth contribution  never happened), not convert - a Roth can never be converted to a Traditional IRA.

Yes you can have the Roth IRA trustee do that and move both the Roth contribution and any earnings attributed to that contribution  to a Traditional IRA prior to the July 15 due date (or Oct 15 if you file a timely extension).  The IRA trustee would issue a 2020 1099-R reporting the recharacterization next January.

It would be deductible if you otherwise qualify to deduct it.