Your pension exclusion is probably calculated automatically and reported on that Maryland input screen ("Here's the income that Maryland handles differently").
NOTE: Your pension is reduced by your total Social Security or Railroad Retirement, so if you also on Social Security, you will not receive the entire 34,300 exclusion, or perhaps no exclusion at all.
Please see the "PENSION EXCLUSION COMPUTATION WORKSHEET (13A)" in the middle of page 6 in the Maryland Instructions.
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