For Ga 2024 estimates. Why didn't TurboTax use the new flat rate tax of 5.49% vs. the 2023 Ga. Tax table? It makes a noticeable difference.

I noticed TurboTax did use the new standard deduction of $24000.00 for married filing joint, but not the new GA. flat tax rate.  Also can you change your Federal & State estimates after you have filed your returns?