The CRNA’s Guide to Avoiding 5 Costly Roth Conversion Mistakes
As a Certified Registered Nurse Anesthetist (CRNA), you’ve achieved substantial financial success, often accumulating over $500,000 in traditional retirement accounts like a 403(b) or 401(k). This dedication deserves a comfortable, even wealthy, retirement. Remember, every dollar in those traditional accounts, including your contributions and growth, will be taxed as ordinary income upon withdrawal. This tax bill can easily total $220,000 to $240,000 on a $1 million account, just in federal taxes.
Roth conversions are the solution to this looming problem, but they must be executed with the same precision you bring to your profession. Simple errors can compound into financial disasters, costing you hundreds of thousands of dollars.
These are the five critical mistakes CRNAs are making and how to avoid them.
Table of Contents
Mistake #1: Converting Too Much, Too Fast
Mistake #2: Being Too Conservative and Underestimating Future Taxes
Mistake #3: Ignoring the Medicare IRMAA Cliffs
Mistake #4: Making Tax Payment and Calculation Errors
Mistake #5: Converting Too Early in the Tax Year
Mistake #1: Converting Too Much, Too Fast
The most common mistake is attempting to convert too much money in one year, or even converting an entire balance all at once.
The Problem: Progressive Tax Rates
When you execute a Roth conversion, the conversion amount is added to your taxable income for the year. Our progressive tax system means higher income pushes you into higher tax brackets. Converting aggressively (e.g., $400,000 in one year on a $1.2 million account) could push a married couple into the 32% or even $35% tax bracket. If your future retirement tax rate were only 24% on those same dollars, you’d actually make your situation worse by overpaying today.
The Solution: Systematic, Multi-Year Strategy
The key is not speed, but paying the lowest tax rate possible on the conversion. Tax projections are critical to this strategy. You must map out your projected income for the next 10 to 15 years. Consider your retirement date, when you’ll begin Social Security, and what your Required Minimum Distributions (RMDs) will look like. Then, design a systematic, multi-year conversion strategy that fills up the lower tax brackets year after year, avoiding the spike of a large one-time conversion.
Mistake #2: Being Too Conservative and Underestimating Future Taxes
The opposite extreme of Mistake #1 is being too conservative because of a misunderstanding of what future tax rates will actually be.
The Problem: Miscalculating Future Tax Liability
Roth conversions only make sense if you pay less in taxes today than you will pay in the future. Many assume retirement tax rates will be much lower simply because they won’t be working. This assumption is often wrong for three crucial reasons. First, if you’ve successfully accumulated $800,000, $1 million, or more, your Required Minimum Distributions (RMDs) alone could push you into higher tax brackets than you expect.
Second, CRNAs often underestimate how much income they will want in retirement, as most successful CRNAs do not want to dramatically reduce their standard of living. Third, none of us know what future tax rates will be, but the odds of them dropping are very slim; current federal tax rates are near multi-decade lows, and with the growing national debt, future congresses will likely look for new revenue sources, not to lower tax bills.
The Solution: Taking Control with Known Rates
The smartest move is not to guess future brackets, but to design a plan so you win either way. Paying known rates today is a smart hedge against potentially higher, unknown rates tomorrow. You must run proper tax projections and understand your complete tax picture over the next 15 to 20 years to make smart conversion decisions.
Mistake #3: Ignoring the Medicare IRMAA Cliffs
This is a particularly tricky mistake because the costly consequence does not appear for two years, when it’s too late to fix.
The Problem: Costly, Delayed Medicare Surcharges
When you do a Roth conversion, that conversion amount is added to your adjusted gross income. Medicare determines your premiums by looking at your income from two years prior. If your conversion pushes your income above certain thresholds (called IRMAA, or Income Related Monthly Adjustment Amount), Medicare adds surcharges to both your Part B and Part D premiums. These surcharges can be significant, potentially reaching $500 to over $2,000 per person each year. If you cross an IRMAA threshold, you won’t find out until two years later when your Medicare premiums suddenly spike.
The Solution: Mapping Both Tax Brackets and IRMAA
If you are age 63 or older, you must map out both your tax brackets and the IRMAA thresholds. You must consider that an IRMAA cliff can exist right in the middle of a tax bracket. For example, stopping conversions at the IRMAA threshold, rather than the tax bracket maximum, can save thousands in Medicare premiums.
- For married filers, the IRMAA thresholds for 2025 start at $212,000 of modified adjusted gross income.
- For single filers, they start at $106,000.
Remember, the conversion you do this year will affect your Medicare premiums two years from now.
Mistake #4: Making Tax Payment and Calculation Errors
The issues with tax payments are fourfold, leading to penalties and unexpected costs.
The Problem: Penalties, Hidden Costs, and Incorrect Math
Firstly, forgetting to pay the taxes altogether happens more often than one might think, leading to a huge tax surprise come April. Secondly, the IRS requires you to make quarterly payments throughout the year. If you do a large conversion and wait until the following April to pay the entire tax bill, you can be hit with underpayment penalties.
Thirdly, there is a nuanced calculation error when paying the conversion taxes from the conversion itself. Converting the exact room you have in a tax bracket will cause the tax withheld to push the distribution above your target and into the next bracket or past an IRMAA threshold. Finally, if you are under age 59 and a half, and you have the taxes withheld from the conversion itself, that withholding is treated as an early distribution and is hit with a $10% early withdrawal penalty.
The Solution: Proper Planning and Calculation
An alternative approach is to pay conversion taxes from other sources when possible, or at least make estimated quarterly payments separately. When you do a conversion, immediately calculate the taxes and either make a quarterly payment or set aside the money in a separate account.
Do not wait until April of next year. If you must pay taxes from the conversion itself, you need to work backward to calculate the correct conversion amount so that the conversion plus the tax withheld equals the top of your target bracket.
Mistake #5: Converting Too Early in the Tax Year
All conversion planning relies on your projected income for the year.
The Problem: Income Surprises Derail Planning
Converting in January or February is risky because if you have unexpected income later in the year (like a bonus, consulting income, or higher-than-expected Social Security), suddenly your entire tax picture has changed. That conversion that was supposed to keep you in the 22% bracket might now push you into the 24% or 32% bracket, or worse, trigger IRMAA surcharges you did not plan for.
The Solution: Wait for a Clear Income Picture
Ideally, you can wait until October or November to do your conversions. By that time, you have a much clearer picture of your income for the year and a reduced chance of surprises. An added advantage of waiting is that you can also evaluate the performance of your investments.
For instance, if your traditional IRA is down 20% due to market volatility, that might be a great time to convert more shares while their value is temporarily depressed. Waiting until October allows you to maximize the tax planning benefits, which usually outweigh the small cost of investing the money in the Roth environment for a few fewer months.
Your CRNA Action Plan
You’ve worked too hard and saved too much money to let simple mistakes cost you hundreds of thousands in retirement. A systematic Roth conversion strategy can put you on track to avoid these costly errors.
If you need help, please reach out to me or schedule a call directly on our website at Oak Capital Advisors. I can help you think through your Roth strategy and see if working with us makes sense for you and your family.
