You can, if you want it to be a non-deductible contribution. The time limit it to do the recharacterization is before April 15 (or Oct 15 if you filed a timely tax return or extension). Since you met the deadline already, then when you report is is immaterial.
If you want to claim the Traditional IRA deduction then amending might increase your refund amount. Keep in mind that amended returns take about 4 months to process.
**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.**
