I filed as a resident of LA after May 27, 2018 but when I entered my income I entered everything I earned for whole year. Should I of substrates the first 5 months from that figure for la state tax
Yes, you should only file a Louisiana Part Year Resident Tax Return.
If you file as a full year resident, you will be taxed on the income you earned while a resident of Texas.
By filing as a part year resident of LA, you will only be taxed on the income you earned after May 27, 2018.
For more information, follow this link: LA Individual Income Tax Return FAQs