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Hidden Surcharge

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AUTHOR: DAN SMITH on 4/21/2026

Good Lord, I just turned to AI for a few fun facts. It answered by asking me if my question was in reference to the piece I submitted to HumbleDollar today. While I find that a bit creepy, it gave me an interesting factoid. Here it is, word for word:

The “Hidden Surcharge” Fact: > Most people think the highest marginal tax rate in the U.S. is 37%. However, when you factor in the MAGI “cliff” for Medicare Part B and Part D (IRMAA), a single dollar of additional income can effectively be taxed at a rate of over 1,000% for that specific dollar, because it triggers thousands of dollars in higher premiums for the entire year.

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Joe D'Alessandro
16 days ago

Wealthy people complaining about paying their fair share while poor people being denied food because of SNAP cuts and thrown off health insurance (including independent business people and elderly under 65) because of Republicans…nice!

R Quinn
16 days ago

We are well into IRMAA premiums, for 2024 and 2025 our effective income tax rate was 18% including, of course, RMDs. The effective tax rate is what counts as far as I’m concerned.

Ormode
16 days ago

Well-off retirees are usually smart about taxes. If you play your cards right, you can pay less than 20% total Federal tax, including NII and IRMAA. Assuming $6500 addition premiums for IRMAA, I’m still paying about 18%.
Of course, if you first RMD is $900K, you’ll pay more – a nice problem to have.

Mark Eckman
17 days ago

There was a time when the top rate was 70% and those writing the tax laws brought that down to 37%. But government spending never came down. The tools to collect just changed.

I see a strange parallel to retirement, the sources of income change and life goes on.

John Yeigh
21 days ago

AI is too low, as the marginal tax rate can be as high as 28,000 percent on the next dollar:

https://humbledollar.com/2023/04/that-28000000-tax/

Don Carrera
21 days ago

When you include the Net Investment Income Tax (NIIT), the highest U.S. income tax rate goes to 40.8%. It’s tough to get to 37% without having the NIIT come into play.

Nick Politakis
22 days ago

Amazing!

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