You can request a "return of contribution" from the IRA custodian at any time up to the due date of the tax return (or extended due date, Oct 15, if a timely extension is filed). Any earnings on contribution must also be returned and the earning would be taxable.
If this was a 2018 contribution made in 2019 then the due date is April 15 and if an extension is filed prior to that (OR you timely file the 2018 tax return before Apr 15) then you have until Oct 15, 2019 to have it returned.
If it was a 2019 contribution then the dates to remove are April 15, and Oct 15, 2020 to have it returned.
Be sure to have it removed as a "return of contribution" and not just a normal distribution so the IRA custodian will properly prepare a 1099-R with either a code P (2018 contribution) or code 8 (2019 contribution) - the 2019 1099-R will be received next January.
**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.**
