It seems you're combining a question on RMD and making Estimated Tax Payments, so I'm confused as to what your actual question is. Your tax bracket wouldn't normally go up unless you receive a large amount of income in one year, and we can't speak to Medicare tiers in this forum, although this link from Medicare may answer your question.
Here's more info on Is My Retirement Distribution RMD? and RMD FAQ's. from the IRS.
Also, a detailed article on Paying Estimated Taxes and Where to Enter Estimated Tax Payments, including those made for 2025 in 2024.
@Ken5151
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