Solved
Do I need to enter my contributions to my employer matched SIMPLE IRA? It is listed on my W2 in box 12a code S, do I also need to enter it under Traditional IRA contributions?
No, do not enter this amount under Traditional IRA contributions. As you stated, it is already accounted for on your W-2 in Box 12 with Code S. Code S is used for employee salary reduction contributions under a section 408(p) SIMPLE plan (not included in Box 1).
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