A Roth account is one of the best deals in the tax code: money that grows tax-deferred, comes out tax-free, and, unlike a traditional IRA, never forces you to take it out on the government’s schedule. The hard part isn’t wanting one. It’s getting money into it, because the rules put up walls in two different places.
There are two doors around those walls, and they solve two different problems. One is for high earners who are told they make too much to contribute. The other is for people, often a little later in life, sitting on a pile of pre-tax money who want to move it into Roth on their own terms. They’re related, they share a lot of the same plumbing, and they’re easy to confuse. So let me take them one at a time.
PART ONE
The Backdoor Roth — getting new money in past the income wall
There’s a particular frustration that shows up somewhere past a few hundred thousand in income, when you go to fund a Roth and find the door locked from the inside. For 2026, the ability to contribute directly phases out between $153,000 and $168,000 of modified adjusted gross income if you’re single, and between $242,000 and $252,000 if you’re married filing jointly. Clear those and the front door is shut. Most people stop there. They shouldn’t.
There’s a side door, open since 2010 and entirely legal. It’s two steps. You put money into a traditional IRA without taking the deduction, you can’t deduct it at your income anyway, so you’re giving up nothing — which makes it after-tax “basis.” Then you convert that traditional IRA to a Roth. There’s no income limit on conversions, and because you already paid tax on those dollars, the conversion itself triggers little or no additional tax. For 2026 that’s up to $7,500, or $8,600 if you’re 50 or older. A couple can each do it, including a non-working spouse, for a combined $15,000, or $17,200 if you’re both over 50.
That’s the whole maneuver, and if you have no other IRA money floating around, you’re done. The catch is that last phrase, “no other IRA money”, and most successful people have some.
The trap nobody warns you about
When you convert, the IRS doesn’t look at your fresh contribution alone. It adds up every traditional, SEP, and SIMPLE IRA you own, treats them as one pot, and taxes your conversion in proportion to how much of that pot is pre-tax money. You don’t get to convert only the clean after-tax dollars.
Here’s how it bites. Say you rolled an old 401(k) into an IRA after changing jobs, the most ordinary thing in the world, and it holds $93,000 of pre-tax money. You add your $7,500 and go to convert, expecting it to be clean. Instead the IRS sees a $100,500 pot that’s about 93% pre-tax and taxes roughly 93% of your conversion as ordinary income. The tax-free move just became a very taxable one. That forgotten rollover is, by a wide margin, the most common way people hurt themselves here.
There’s usually a clean fix. The best is a reverse rollover: if your current employer’s 401(k) accepts incoming money, many do, you move that pre-tax IRA balance into the plan, where it sits outside the math. Do it before December 31 of your conversion year, and the field is clear. The order of operations is everything, which is exactly why it’s worth a conversation before you start moving money.
The bigger door most people never check for
For most high earners, the regular backdoor is a good habit but a small number, $7,500 is a rounding error against a serious balance sheet. The version worth getting excited about is its much larger sibling, and plenty of people hold the key without knowing.
If your employer’s 401(k) allows after-tax contributions — a separate bucket from your usual pre-tax or Roth deferrals — and also permits in-plan Roth conversions or in-service withdrawals, you can move dramatically more into Roth. The total 2026 ceiling across everything (your deferrals, the match, and these after-tax dollars) is $72,000, or $80,000 if you’re 50 or older. After your own contributions and the match, the room left over can run to tens of thousands a year that you sweep into Roth, and because it all happens inside the 401(k), the pro-rata rule never enters the picture.
Roughly four in ten large plans allow this, and most people who could use it have never read far enough into the plan document to find out. Hand us the summary plan description and we’ll look for two phrases: “after-tax contributions” and either “in-service distributions” or “in-plan conversions.” If both are there, you may be holding one of the most powerful tools available to anyone who earns a W-2.
Three small things that separate clean from costly
1. File Form 8606 — every single year. It’s the form that proves you already paid tax on those dollars. Skip it and the IRS has no record of your basis, which means it can tax the same money twice. Most common mistake in the whole strategy, and the most avoidable.
2. Convert promptly. Any growth between contribution and conversion is taxable at ordinary rates. Leave it in cash, convert within days, and there’s essentially nothing to tax. Plenty of people do both steps in the same week on purpose.
3. Notice which way the wind blows. As of January 1, 2026, if you earned more than $150,000 last year, your 401(k) catch-up contributions now have to be Roth. It doesn’t change the backdoor, but it’s part of a clear drift toward Roth treatment for higher earners.
PART TWO
The Roth Conversion — moving money you already have
This solves a different problem. The backdoor is about getting new money past an income wall. A conversion is about money you already own(a traditional IRA, an old 401(k)) and deciding to pay the tax on it now, deliberately, so it never gets taxed again. There’s no income limit and no dollar cap. You can convert ten thousand dollars or a million. The only real question is whether the tax you’d pay this year is worth what it saves you later.
First, the correction nobody tells you about
For years the pitch was “convert now, before the 2017 tax cuts expire at the end of 2026 and rates jump back up.” That deadline is gone. The One Big Beautiful Bill Act, signed in July 2025, made those lower rates, 10 through 37 percent, permanent. So if anyone is still selling you urgency built on a 2026 sunset, they’re reading from an old script. The real case for converting was never really about the federal rate schedule. It’s about your rate, and yours is very likely going up no matter what Congress does.
Why your own rate climbs: the RMD problem
At 73 — or 75 if you were born in 1960 or later — the IRS starts forcing money out of your traditional accounts whether you need it or not, taxes it as ordinary income, and stacks it on top of Social Security and any pension. On a seven-figure balance that forced withdrawal can run well into six figures a year, and it climbs as you age. A Roth has no lifetime required distributions at all. Every dollar you move over now is a dollar that never lands on that forced-withdrawal schedule, and never inflates the brackets you’ll be taxed in later.
The window: the quietest tax years you’ll ever have
The sweet spot is the stretch between the day you stop working and the day distributions begin. Earned income is gone, Social Security may not have started, and for a few years you may be sitting in the lowest brackets you’ll see for the rest of your life. That’s the room to convert: filling up the 22% or 24% bracket on purpose, year by year, at a known cost, instead of getting shoved into higher brackets later by force. Every year you let pass without using that room is bracket space gone for good. It’s the single most valuable planning window most retirees ever get, and most people don’t start early enough to use all of it.
Where conversions go wrong
Medicare is the trap people don’t see coming. A conversion spikes your income for the year, and Medicare sets your premiums by looking at your income from two years back. Cross a line — $109,000 of MAGI for a single filer, $218,000 for a couple in 2026, and your Part B and Part D premiums jump two years later. It’s a cliff, not a ramp: one dollar over the threshold triggers the entire surcharge. So once you’re near Medicare age, conversions get sized against that ceiling, not just the tax bracket.
Social Security can get dragged in. If you’re already collecting, a conversion raises your provisional income and can push more of your benefit into taxable territory in that year.
The clock, and the one-way door. Each conversion starts its own five-year clock before you can touch those converted dollars penalty-free if you’re under 59½, and a conversion can’t be undone. Size it carefully; there’s no reset button.
Pay the tax from outside the account. This is the highest-value decision in the whole strategy. Cover the tax bill with money from a taxable account rather than withholding it out of the conversion, so every dollar actually lands in the Roth and compounds. Paying the tax from the IRA itself quietly guts the benefit.
Why it still wins, even with rates flat
Smaller forced withdrawals for the rest of your life. Under current rules, most non-spouse heirs have to empty an inherited account within ten years. If it’s a traditional IRA, they pay income tax on every dollar, often right in their own peak earning years. If it’s a Roth, they pay nothing. You’ve pre-paid the tax at your rate instead of theirs. There’s a quieter benefit too: when one spouse dies, the survivor usually files single, at tighter brackets, and converting ahead of that softens the blow.
So which door is yours?
If you’re still working and earning well and want to keep building Roth, it’s the backdoor, and the mega backdoor if your plan supports it. If you’re retired or close to it, sitting on a sizable traditional IRA or old 401(k) in a low-income window before distributions start, it’s conversions. Plenty of people do both, at different stages of life. And both run through the same plumbing: no income limit, the pro-rata rule, Form 8606, and the five-year clocks, which is exactly why it pays to have someone watching all of it at once.
None of this is about chasing a deadline anymore. It’s about whether paying some tax on your terms now beats paying more on the IRS’s terms later. For most people with real pre-tax balances and a few quiet years ahead, it does, often by a lot. The work is sizing it right against your brackets, your Medicare, and your heirs, and that’s worth modeling before you move a dollar.
If you’d like, we’ll map your actual situation, what’s in your accounts today, which door fits, and the cleanest sequence for your year. That’s the kind of planning we do here.
The opinions voiced in this material are for general information only and are not intended to provide specific advice or recommendations for any individual.
A Roth IRA conversion—sometimes called a backdoor Roth strategy—is a way to contribute to a Roth IRA when income exceeds standard limits. The converted amount is treated as taxable income and may affect your tax bracket. Federal, state, and local taxes may apply. If you’re required to take a minimum distribution in the year of conversion, it must be completed before converting.
To qualify for tax-free withdrawals, you must generally be age 59½ and hold the converted funds in the Roth IRA for at least five years. Each conversion has its own five-year period, and early withdrawals may be subject to a 10% penalty unless an exception applies. Income limits still apply for future direct Roth IRA contributions.
This material is for informational purposes only and does not constitute tax, legal, or investment advice. Please consult a qualified tax professional regarding your individual circumstances.