SEP IRA contributions are a little different than other IRA contributions. In short, SEP contributions are designated as a contribution for the calendar year in which they are made. From the IRS website:
Why is last year’s contribution that was made this year for the SEP-IRA shown on this year’s Form 5498 instead of last year’s Form 5498?
The IRS requires contributions to a SEP-IRA to be reported on the Form 5498 for the year they are actually deposited to the account, regardless of the year for which they are made.
What this means is that we'll report your contributions made in 2018 as 2018 contributions, and any contributions made in 2017 as 2017 contributions. However, you can still file the contribution for the Prior Year on your taxes as long as you made your deadline.
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