Roth accounts are among the most valuable tools in a long-term financial plan. Money grows tax-free, qualified withdrawals are tax-free, and unlike traditional retirement accounts, Roth IRAs are not subject to required minimum distributions during the owner’s lifetime. For a physician who expects to be in a high tax bracket for decades and well into retirement, that tax-free growth is enormously useful.
There is just one problem. High earners are not allowed to contribute to a Roth IRA directly. In 2026, the ability to contribute phases out at modified adjusted gross income between $153,000 and $168,000 for single filers, and between $242,000 and $252,000 for married couples filing jointly. Most attending physicians are well past those limits within a year or two of finishing training.
The good news is that the income limits apply to direct contributions, not to every path into a Roth. Two well-established strategies, the backdoor Roth and the mega-backdoor Roth, let high earners fund Roth accounts anyway. Used together over a career, they can move a substantial amount of money into the tax-free column.
The Backdoor Roth IRA
The backdoor Roth is a two-step maneuver. You contribute to a traditional IRA, which has no income limit on contributions, and then convert that traditional IRA to a Roth. The conversion itself has no income limit. The result is money in a Roth IRA that you could not have contributed directly.
For 2026, the IRA contribution limit is $7,500, or $8,600 if you are fifty or older. A married couple can each do this, doubling the amount. Done annually over a long career, it adds up.
The maneuver is simple in concept but has one critical complication.
The Pro-Rata Rule, the Trap That Catches Physicians
The backdoor Roth works cleanly only if you do not hold other pre-tax money in traditional IRAs. The reason is the pro-rata rule. When you convert, the IRS treats all of your traditional IRA balances as one pool and taxes the conversion proportionally based on how much of that pool is pre-tax versus after-tax.
This trips up physicians constantly, because many have rolled an old 401(k) or 403(b) from a residency or a prior job into a traditional IRA. If you have, say, a large rollover IRA full of pre-tax dollars and you try a backdoor Roth on a $7,500 after-tax contribution, most of the conversion becomes taxable. The strategy loses its advantage.
There is usually a fix. If your current employer’s 401(k) or 403(b) accepts incoming rollovers, you can often move the pre-tax IRA money into the workplace plan, which removes it from the pro-rata calculation and clears the way for clean backdoor conversions. This is exactly the kind of sequencing that needs to happen before you execute, not after.
The Mega-Backdoor Roth
The mega-backdoor Roth is the larger and less widely understood cousin. It runs through a workplace retirement plan rather than an IRA, and it can move far more money.
It depends on two plan features. First, the plan must allow after-tax contributions, which are separate from and on top of the regular pre-tax or Roth deferral. Second, the plan must allow either in-plan Roth conversions or in-service withdrawals, so that the after-tax money can be moved into Roth treatment.
When both features exist, the mechanics work like this. The total that can go into a defined contribution plan in 2026 is $72,000. Your regular employee deferral and your employer’s match use part of that. The space remaining between those amounts and the $72,000 ceiling can often be filled with after-tax contributions, which are then converted to Roth. For a physician whose employer plan is built for this, the mega-backdoor can move tens of thousands of additional dollars into Roth each year, far beyond what the regular backdoor allows.
The key is to convert the after-tax contributions to Roth promptly, because any investment earnings that accrue before conversion are taxable when converted. Many plans that support this allow automatic, immediate conversion for exactly that reason.
Putting It Together Over a Career
For most high-earning physicians, the sequence looks something like this.
- Maximize the regular 401(k) or 403(b) deferral first, capturing any employer match.
- Clear out pre-tax IRA balances if you intend to do backdoor Roth contributions, so the pro-rata rule does not undermine them.
- Execute a backdoor Roth IRA each year, ideally for both spouses.
- If your employer plan supports it, layer in the mega-backdoor Roth to move additional after-tax dollars into Roth.
Whether to favor Roth or pre-tax savings overall depends on your current bracket versus your expected bracket in retirement, and for physicians who expect high income for life, a meaningful Roth allocation often makes sense. But that is a judgment to make deliberately, with the full picture in view.
A Long-Term Perspective
Tax-free growth compounds quietly and powerfully over a long career. A physician who starts these strategies early and runs them consistently can accumulate a large Roth balance that provides flexibility, tax diversification, and a source of tax-free income in retirement, along with favorable treatment for heirs. The amounts seem modest in any single year, but the decades of compounding are where the value lies.
The goal is to use every legitimate path into tax-advantaged savings that the rules allow, and to sequence the steps so that avoidable traps like the pro-rata rule do not quietly erode the benefit.
At Carrara, we help physicians build and execute a Roth strategy as part of a complete plan, coordinating the account mechanics, the rollover sequencing, and the broader tax picture so the pieces work together.
This article is provided for educational purposes only and does not constitute tax, legal, or investment advice. Contribution limits and tax rules depend on individual circumstances and change over time. Please consult qualified tax and financial advisors regarding your specific situation.