Since your IRA custodian applied your contribution made in January 2017 to the 2017 tax year, despite your intent to apply it for 2016, you'll have to amend your 2016 tax return to remove that contribution, then claim it on your 2017 tax return.
To amend your 2016 tax return, please follow these instructions:
https://ttlc.intuit.com/replies/3288565
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
