Delaying my Social Security to age 70 will put my total income over $85,000. As I understand it, income over that mark, incurs higher Medicare payments. There must be something to mitigate this, right? If there is I can't find it. If I take SS at 62, I'll definitely be under $85,000, but my preference has always been to wait as long as possible to use SS as longevity insurance.
Am I missing something?:
Presumably, your problem is RMDs. That's the usual reason that retirees find themselves with more income than spending.
Note that if you defer SS, you will probably spend down more of your IRA between 62 and 70. That means lower RMDs after 70.
If RMDs seem particularly onerous, you may plan to do Roth conversions.
The tax implications of deferring SS are pretty complex. The interaction of the non-COLA'd SS tax factors, RMDs, Roth vs. traditional, unknown future investment income, ratio of SS to other income, unknown future inflation, and unknown future tax law changes can be pretty daunting.
OTOH, most of us can rule out some of the complexities (for example it appears you're single so you don't need to worry about rules for couples).
I'd build a multi-year model with variables for the unknowns. Include the extra Medicare Part B premium as if it were a stepped tax on gross income. Run the model with a variety of different assumptions and see if any patterns emerge.
When I did that for our situation, I decided the unkowns overwhelmed everything
except that trad to Roth conversions made sense as long as we were in the 15% marginal bracket. W2R's comment is correct, I just couldn't do this level of fine tuning given the range of unkowns.
That was when I was 60. Now that I'm 66, I'll probably look at those Roth conversions again. Maybe they make sense even at higher marginal tax rates.