How Your First RMD at 73 Can Spike Medicare Costs

You finally hit 73 and the IRS comes knocking. Your first Required Minimum Distribution (RMD) from a traditional IRA isn't optional — and if you've been a diligent saver, that forced withdrawal can be a big number. The problem isn't just the income tax bill. It's what that extra income does to your Medicare costs.

Medicare uses a two-year lookback on your income to set your Part B and Part D premiums. That's the IRMAA cliff — the Income-Related Monthly Adjustment Amount. Cross certain income thresholds and your premiums jump in surcharges that can cost you hundreds, even thousands, of dollars extra per year. A large first RMD can push you over one of those brackets and keep you there for an entire calendar year before you can appeal or adjust.

Read more Mortgage Demand Slumps as Rates Stay Stuck in Tight Range →

Here's the gut punch: you can't always predict exactly how large your first RMD will be until the year is nearly done. The IRS calculates it based on your account balance at the end of the prior year divided by a life expectancy factor. Markets run hot in your pre-retirement years? Congratulations — your RMD just got bigger, and so did your IRMAA exposure.

The tradeable angle here is planning, not panic. Roth conversions in your 60s — before RMDs kick in — are one of the most effective ways to reduce future taxable withdrawals and keep your income below IRMAA thresholds. If you're already 73 and staring down a large distribution, a qualified charitable distribution (QCD) lets you send up to $105,000 directly from your IRA to charity, satisfying part of your RMD without the income ever hitting your adjusted gross income.

Timing and strategy matter more than most retirees realize. One bad year of income from a poorly timed RMD can cost you significantly in Medicare surcharges — and you won't feel the hit until two years later when it shows up in your premiums. Get ahead of this now. Continue reading at Yahoo Finance.