The Backdoor Roth Window Closes April 15. But the Real Question Is Whether It Still Makes Sense for You.

Here's a conversation that plays out in planning offices across the country every April.

A surgeon sits down with her advisor after meeting with her CPA. Return filed, Q1 estimated payment calculated. Then comes the question: "Should I go ahead and fund my backdoor Roth before the fifteenth? I do it every year."

The advisor asks: "Why?"

A pause. "Because I've always done it. My old advisor told me years ago to do a backdoor Roth every year, and I never stopped."

That autopilot answer is remarkably common. And for years, it was perfectly reasonable advice. But the tax landscape shifted in 2025, and a lot of surgeons haven't updated their thinking to match.

The Assumption That Stopped Being Automatic

Here's the conventional wisdom: contribute to a traditional IRA, convert immediately to a Roth, pay the taxes now, and let the money grow tax-free forever. For high earners locked out of direct Roth contributions, the backdoor strategy has been a staple for over a decade.

The logic depended on one critical assumption: that tax rates would go up. If you believed rates were heading higher, paying taxes now at a "lower" rate and withdrawing later tax-free was a clear win.

Then the One Big Beautiful Bill Act (OBBBA) made the 37% top rate permanent, along with the broader TCJA bracket structure, with thresholds indexed for inflation.

That changes the calculation in a way that most autopilot strategies haven't absorbed. If 37% is no longer a temporarily low rate but the long-term ceiling, and if you expect your retirement income to place you in a lower bracket, then the backdoor Roth means paying taxes at the peak and withdrawing at a level where you would have owed less. That’s mathematically backwards.

On top of that, for high earners who already have pre-tax IRA balances, the pro-rata rule can cause a portion of any backdoor Roth conversion to be taxable, so the actual tax impact should be modeled with a CPA using Form 8606 rather than assumed.

The Decision Tree You Should Be Using

Rather than defaulting to "always do the Roth," the better approach is to walk through a simple framework. There are three branches, and your answer depends on where you sit today and where you're heading.

Branch 1: Roth still makes sense

If your current marginal rate is relatively low (maybe you're in a transition year with lower income, or you're early in practice and not yet at peak earnings), and you expect your retirement income to be higher than it is today, or estate planning is a top priority, then funding the Roth remains a strong move. Roth IRAs have no lifetime required minimum distributions for the original owner, and qualified withdrawals are income-tax-free. Beneficiaries are generally subject to the post‑SECURE 10‑year distribution rule but usually do not owe income tax on distributions, and for families under the current federal estate and gift tax exemption (now $15 million per person beginning in 2026, indexed for inflation), Roth assets can often pass free of federal estate tax, subject to any applicable state transfer taxes. The tax-free growth and flexible withdrawal rules are genuinely powerful tools in estate and legacy planning.

Branch 2: Traditional and cash balance contributions win

Consider a surgeon in this position, purely as an illustration. She's 55, earning north of $1.2 million, paying a combined federal and state rate of 42%. She plans to retire at 62 and move from a state with a 5% income tax to one with no income tax. Her expected retirement withdrawal rate will place her around 24% federal.

At 42% now versus 24% later, every dollar she converts to a Roth is taxed at nearly double the rate she'd pay in retirement, if those assumptions hold. The backdoor Roth contribution of $7,500 has already been taxed at 42% on the way in. The growth is tax-free, yes. But on the contribution itself, there's no tax arbitrage. She's paying the high rate and gaining nothing on the principal.

Now consider the alternative. That same $7,500, redirected toward increasing her cash balance plan contribution, gets sheltered from taxation entirely at 42%. That's $3,150 in immediate tax savings. For illustration only, if that $3,150 of tax savings compounded at a hypothetical 6% annual rate for 10 years, it would grow to roughly $5,640. Actual returns will differ and are not guaranteed, and this ignores plan fees, funding restrictions, and taxes due when funds are ultimately distributed.

And the cash balance plan can often support annual deductible contributions in the low- to mid-six figures (for example, roughly $150,000 to $350,000 or more per year for some physicians in their 50s), subject to actuarial limits, compensation, and plan design, which dwarfs the $7,500 (or $8,600 with catch-up) IRA limit.

The Roth gave her tax-free growth on $7,500. The cash balance redirect gave her meaningful immediate tax savings, years of tax-deferred compounding, and a dramatically larger contribution ceiling. In many high-income situations, the math on prioritization isn’t close.

Branch 3: It depends on your state tax trajectory

This is the branch that gets overlooked most often. If you're currently practicing in a state with a 5% to 13% income tax and you plan to retire in a no‑income‑tax state (for example, Florida, Texas, Tennessee, Wyoming, Nevada, South Dakota, and others), the state tax component alone can swing the analysis. A surgeon paying 5% state tax today who retires in Florida effectively saves that 5% on every dollar withdrawn in retirement. That state-level savings can offset some or all of the federal rate differential and tip the balance back toward traditional contributions and tax deferral.

Conversely, if you're in a no-tax state now and plan to stay, the state tax variable is neutral, and the decision rests entirely on your federal rate trajectory.

The $7,500 Question in Context

Here's what makes the backdoor Roth conversation misleading when it happens in isolation. The contribution limit ($7,500, or $8,600 if you're 50 or older for 2026) is small relative to the other tax planning tools available to a surgeon earning over a million dollars a year.

If you're agonizing over how to deploy $7,500 while your cash balance plan is underfunded, your donor-advised fund contributions haven't been optimized, and your Q1 estimated payment was calculated without accounting for structural changes in your tax picture, then you're adjusting the rearview mirror while the engine needs a tune-up.

The April 15 deadline creates urgency around the prior-year IRA contribution. That urgency is real. But it shouldn't override the analysis. If you haven't modeled both paths (Roth conversion versus redeploying that capital into higher-impact strategies), you're making a decision based on habit rather than math.

The Diagnostic Leads to the Decision

Last week's post talked about treating your tax return as a diagnostic, a set of findings that reveal how well your financial structure is performing. This week is the natural next step. The diagnostic is in. Now you have a time-sensitive decision to make before April 15, and the right answer depends on what the diagnostic revealed.

If your return shows that you're paying an effective rate above roughly 38% and you don't have a cash balance plan or similar deferral structure in place, the backdoor Roth may not be the highest-value use of your next dollar. If your return showed strong tax deferral, relatively low effective rates, and a fully funded retirement structure, then the Roth can become a useful complementary tool for estate planning and tax diversification.

The point is that the decision should follow the data. Not the calendar. Not the habit. Not the advice you received five years ago under a different tax code. These are general planning concepts; your specific answer depends on your full tax and financial picture and should be evaluated with your CPA and advisor.

Why This Matters Beyond April

There's a deeper principle here that extends well past the filing deadline. The surgeons who build the most durable wealth are the ones who resist autopilot. They question assumptions, even comfortable ones. They update their strategies when the rules change. They treat every financial decision with the same rigor they bring to a complex surgical case: evaluate the current data, consider the alternatives, choose deliberately.

A backdoor Roth is a fine tool. But a tool used reflexively, without evaluating whether it's the right tool for the current situation, isn't strategy. It's routine. And routine, in the operating room or on the balance sheet, is where outcomes quietly erode.

Before April 15, take twenty minutes. Pull up your return (or the diagnostic from last week). Look at your current marginal rate. Look at your expected retirement rate. Look at your state tax trajectory. Then decide, with fresh eyes and current math, whether the Roth is the best use of that contribution or whether the capital serves you better somewhere else.

The answer isn't "always do the Roth." The answer is: model both and choose deliberately.

Capably Yours,

Jared

Important disclosure:

This material is for informational and educational purposes only and is not intended as individualized tax, legal, or investment advice. Tax laws, including OBBBA provisions, estate tax exemptions, and retirement plan rules, are subject to change and may differ by jurisdiction. Hypothetical examples are for illustration only; they do not reflect any specific investment and do not guarantee future results. Consult your CPA, tax advisor, and financial advisor before implementing any strategy or making decisions regarding Roth conversions, cash balance plans, or other tax-related planning.