UPDATED FOR TAX YEAR 2019
Yes, even though you already filed your return the actual contribution can be made up until the personal tax-filing deadline (April 15, or October 15 if an extension was filed). NOTE: The filing deadline has been extended until July 15, 1010. This means you have until July 15 to make the contribution!
If you didn't include the contribution on your tax return and you want any tax benefit from it, you'll have to amend your return.
[Edited | 4/15/2020 | 1:45pm PDT]
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