A Teacher's Retirement system in Louisiana(TRSL) member's retirement benefit is exempt from Louisiana state income tax. However, the benefit is subject to federal income tax and can include both a tax-free amount and a taxable amount. Member contributions made to TRSL before July 1, 1988, were taxed (unsheltered) and are not subject to tax in retirement. However, member contributions made on and after that date were not taxed (sheltered) and become taxable in retirement.
TRSL
Did you select the source of your distribution when you entered the 1099-R? Once selected, LA should automatically exclude the income.

If you need to make any changes after filing, you need to amend your return.
To amend state return check here.
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