Why AI Is the Wrong Tool for Your Roth Conversion Plan

Understanding why AI is the wrong tool for your Roth conversion plan starts with one distinction: AI is excellent at teaching you how conversions work and unreliable at deciding how much of a seven-figure IRA you should actually convert. ChatGPT, Gemini, and Perplexity explain the rules in seconds. Sizing the conversion, though, is a multi-year projection tied to your exact numbers, and that is where a chatbot stops being useful.

Last reviewed: August 2026 | Written and reviewed by Craig Wear, CFP®, founder of Q3 Advisors

What AI does well for Roth conversion research

AI does one job well: education. ChatGPT, Gemini, and Perplexity can explain how a Roth conversion works, define the 5-year rule, walk through how RMDs are calculated, and sketch quick what-if scenarios in plain language. Treated as a first-draft research assistant that prepares you for an advisor conversation, AI shortens the learning curve at no cost.

Ask an AI model to explain the mechanics and the answer is usually accurate. A Roth conversion moves money from a traditional IRA to a Roth IRA, counts as ordinary taxable income in the year you do it, is irreversible, and must be completed by December 31 to count for that tax year. You cannot convert a required minimum distribution. AI states these rules cleanly.

Used as a first draft, AI helps you arrive at a planning meeting already fluent. Asking a model what to ask an advisor about Roth conversions produces a useful question list, and reading an overview of the SECURE Act before a strategy session makes the session itself more productive. AI is strong at these preparation tasks:

• Explaining conversion mechanics, the 5-year rule, and the pro-rata rule
• Defining vocabulary such as IRMAA, MAGI, qualified charitable distribution, and Form 8606
• Describing how RMD ages and the SECURE Act inherited-IRA rules work
• Drafting a list of questions to bring to a fiduciary planner

Where AI fails: the multi-year model it cannot run

AI fails at Roth conversions because sizing one is a projection, not a lookup. The right number comes from modeling five or more years forward while simultaneously tracking IRMAA brackets, the taxation of Social Security benefits, and future RMDs on a growing balance. AI has no access to your full return, so it cannot run that model or hold your numbers.

The actual modeling layer lives in dedicated planning software, not a chat window. Tools such as RightCapital, MoneyGuidePro, eMoney, and Income Lab project year-by-year income, brackets, and RMDs across a lifetime and stress-test the sequence. AI can describe what these tools do, but it does not run them. Our overview of how much of your IRA to convert shows how that projection is built.

RMDs begin at age 73, and at age 75 for those born in 1960 or later, so the earliest age-75 RMD year is 2035. On a seven-figure balance those distributions compound for decades, which is the exact variable a single-year answer ignores. Our guide to required minimum distributions in 2026 covers the schedule in detail.

A concrete IRMAA example AI will miss

Here is the kind of trap AI routinely overlooks. Medicare sets premiums using a two-year income lookback, so a large Roth conversion today raises your Part B and Part D premiums two years later. Seeing only the conversion tax, AI misses the surcharge entirely, and for a married couple the higher premium lands on both spouses.

Consider a married couple, both on Medicare, with joint MAGI already near $200,000. A $150,000 Roth conversion lifts their MAGI well above the $218,000 joint IRMAA threshold for 2026. Because Medicare looks back two years, the surcharge does not appear on the conversion-year return, it lands two years afterward. The standard 2026 Part B premium is $202.90 per month, and the IRMAA surcharge adds to that figure for each spouse. A household that converts in two consecutive years then absorbs a higher premium in each of the two matching years, a cost a single-year AI answer never surfaces.

A conversion is not itself net investment income, so it does not trigger the 3.8% NIIT directly. The added income can still push a household’s other investment income over the $250,000 joint threshold, as our note on the net investment income tax in 2026 explains.

Tax-adjusted net worth: what a $2 million IRA actually means

The number AI ignores most often is the gap between an IRA statement balance and its spendable value. A $2 million traditional IRA is not $2 million of wealth. The IRS holds an embedded claim on every future distribution, so the household keeps only what remains after tax. Tax-adjusted net worth, not the statement balance, is the figure that funds retirement.

Picture a household at age 85 with $2 million still in a traditional IRA. The statement reads $2 million, but every dollar that comes out, through their own RMDs, a survivor’s RMDs, and eventually the heirs’ distributions, is taxed as ordinary income. If the effective rate on those dollars lands near 30 percent, the spendable value is closer to $1.4 million. A strategic conversion plan optimizes that after-tax figure, which AI treats as if it were already the statement balance.

The survivor trap AI overlooks

AI almost never accounts for the survivor trap. When the first spouse dies, the survivor files as a single taxpayer the following year, and single brackets and IRMAA thresholds hit at roughly half the joint levels. The same RMD that felt comfortable on a joint return can push a widow or widower into the 32 percent or 35 percent bracket.

In 2026 a married couple reaches the 32 percent bracket at $403,550 of taxable income, while a single filer reaches it at $201,775. IRMAA follows the same compression, applying above $218,000 for a couple and above $109,000 for one person. A surviving spouse inherits the full IRA and the full RMD but loses half the room to hold it. Conversions completed while both spouses are alive can move balance into the Roth before that squeeze arrives, a multi-decade tradeoff a single-year AI answer cannot weigh.

AI is not a fiduciary: the accountability gap

AI has no fiduciary duty, no license, and no malpractice exposure, so it has nothing to lose when its advice is wrong. A registered investment adviser is legally required to act in the client’s interest. When an AI model is confidently wrong, the household carries the entire cost, and the provider’s terms of service typically disclaim liability for financial advice.

Large language models generate fluent answers whether or not the underlying figure is correct, and they depend entirely on the inputs you feed them. A model may quote an outdated bracket, an old RMD age, or a threshold that has changed. Verify any number an AI gives you against the primary source: the IRS at irs.gov for brackets and RMD rules, and the Social Security Administration and Medicare for benefit and premium figures. Fluency is not accuracy.

Why “convert to the top of your bracket” is the wrong 2026 default

The most common AI output, convert to the top of your current bracket, is the wrong default for a seven-figure IRA in 2026. Post-2025 bracket law fixed today’s rates as the reference point, but the bracket that matters is the one your future RMDs and your heirs will face, not the one you happen to stand in this year.

For a single filer in 2026 the 24 percent bracket runs to $201,775, then jumps to 32 percent. Capping conversions at that line feels safe, yet an IRA Millionaire whose RMDs will later sit in the 32 to 37 percent range is only postponing a larger bill. The SECURE Act adds a second reason: heirs must empty an inherited traditional IRA within 10 years, often during their own peak earning years, so their tax rate becomes an input to how much you convert now. Our guide to the Roth conversion deadline for 2026 covers the December 31 timing that governs each year’s window.

AI helps versus AI fails: a side by side

The honest summary is that AI and a strategic Roth conversion planner do different jobs. AI is a strong educator and a weak decision-maker. The table below separates the tasks where a chatbot genuinely helps from the tasks that require multi-year modeling, fiduciary accountability, and judgment about factors a model cannot see.

Common mistakes to avoid

Several errors quietly raise the cost of relying on AI or generic online advice for Roth conversion decisions. Each one shares a root cause: an annual, generic answer applied to a lifetime, household-specific decision. The list below flags the patterns that show up most often when a chatbot is treated as the planner.

• Treating “convert to the top of the bracket” as the answer, when it is often the most expensive default for a seven-figure IRA.
• Optimizing this year’s tax bill instead of lifetime tax-adjusted net worth.
• Acting on an AI figure without verifying it against the IRS and the Social Security Administration.
• Ignoring the two-year IRMAA lookback and the survivor trap that follows the first spouse’s death.
• Confusing a model’s fluency with accuracy, and confidence with a fiduciary who is accountable for the recommendation.

Frequently asked questions

Can I use ChatGPT to plan my Roth conversion?

You can use ChatGPT to learn how conversions work, not to size one. It explains the 5-year rule, the December 31 deadline, and RMD mechanics accurately. It cannot see your tax return, so it cannot model IRMAA thresholds, Social Security taxation, and future RMDs together. The decision on how much to convert should sit with an accountable human specialist.

Can ChatGPT give financial advice?

ChatGPT provides general information, not personalized financial advice. It holds no license, owes no fiduciary duty, and its provider’s terms of service typically disclaim liability for financial decisions you make from its output. It also depends entirely on the inputs you give it. Treat any figure it produces as a starting point to verify against the IRS and a qualified professional.

Is AI good at retirement planning?

AI is good at explaining retirement concepts and poor at building a plan. It can define RMDs, Roth conversions, and IRMAA clearly. It cannot run the multi-year projection that a real plan requires, which simultaneously tracks brackets, Medicare surcharges, Social Security taxation, and survivor scenarios. Dedicated planning software and a fiduciary adviser handle that modeling layer, not a chatbot.

How much of my IRA should I convert to a Roth?

There is no single percentage; the right amount depends on your current bracket, projected RMDs, IRMAA thresholds, Social Security timing, survivor brackets, and heir tax exposure under the SECURE Act 10-year rule. Many households convert across several years to smooth income. A multi-year projection built around your numbers, rather than a generic rule, produces the specific figure.

Should I convert to the top of my tax bracket?

Not by default. Converting to the top of your current bracket is the standard AI answer and often the wrong one for a seven-figure IRA. In 2026 the single-filer 24 percent bracket runs to $201,775, but if future RMDs will sit in the 32 to 37 percent range, stopping at that line can lock in a larger lifetime bill.

Can AI calculate my RMDs?

AI can describe the RMD formula and the ages involved, and it may estimate a figure, but it can be confidently wrong. RMDs begin at age 73, and at age 75 for those born in 1960 or later, so the earliest age-75 RMD year is 2035. Verify any calculation against the IRS Uniform Lifetime Table and your account custodian.

Is ChatGPT financial advice reliable?

Not reliable enough to act on unverified. Large language models produce fluent answers whether the underlying number is right or wrong, and they can quote outdated brackets, thresholds, or RMD ages. For six- and seven-figure, irreversible decisions like Roth conversions, confirm every figure against the IRS, the Social Security Administration, and an accountable adviser before acting.

What is the best software for Roth conversion planning?

There is no single best tool; the widely used platforms include RightCapital, MoneyGuidePro, eMoney, and Income Lab, each of which projects year-by-year income, brackets, and RMDs across a lifetime. A general chatbot is not modeling software and does not hold your numbers. What matters more than the software is a fiduciary who runs and interprets the projection for your household.