My apologies. The 6/12ths should be 8/12ths, based on your HDHP being valid from January through August, and your Medicare starting on 9/1/2025.
TurboTax will tell you the amount of your excess HSA contribution in the HSA Interview in the return. That is, when you start your return and begin entering data, in the section about HSAs, at some point, TurboTax will notice that your contributions exceed your calculated annual HSA contribution limit. At that point TurboTax will announce that you have excess contributions and ask how you wany them to be handled - (1) withdrawn, (2) partially withdrawn, or (3) carried over to next year.
My apologies again because it is much more common that taxpayers are halfway through their returns before they ask questions like these, so I mistakenly assumed that you were, too.
Just start your return and be looking for Deductions & Credits->HSA, MSA Contributions->HSA. And during that "interview" (series of questions about your HSA), be looking for the notice that you have excess contributions.
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