Planning for RMD in ‘26 but have a question about withdrawing from non-ira this year.

i live on social security only and do quite well. see if I get this right…half my ss is 18k Towards taxes. Savings account earns about 1k. Individual brokerage account about 10-12k. currently PLTR made me bout 7k and if I cash out would put me over the 25k threshold. If I sold say 5k which would keep me under, am I tax free On that sell?