Should I file Form 8606? I have a Form 5498 FY2018. I believe I need to file a Form 8606 (non deductible IRA contribution) with my 1040, but I'm uncertain.

As posted in the question, I have a Form 5498 for my SEP IRA accounnt which *I believe* my broker files directly with the IRS. I am not sure whether I also need to file 8606 with my 1040 or not.