Is the contribution limit on 403(b) plans reduced if you also contribute to an IRA?

[Opus 17]

It's the other way around.  Your ability to contribute to a deductible IRA is reduced or eliminated depending on your gross income if you participate in the 403(b).  And it doesn't matter how much you contribute to the work plan -- if you are covered by a work plan in any amount, you have to check your income to see if you can make deductible IRA contributions.

https://www.irs.gov/retirement-plans/ira-deduction-limits