Most of the higher earners and business owners I work with at Melby Wealth Management arrive with the same blind spot. They have built meaningful balances in pre-tax accounts, a 401(k), a rollover IRA from a past employer, maybe a SEP-IRA from a side business, and they have never once asked what those balances will cost them in tax when the money comes back out. The account statement shows a big number. A large share of that number belongs to the IRS.
As a CERTIFIED FINANCIAL PLANNER® (CFP®) professional running a fee-only fiduciary firm in Nashville, my goal in writing this is to show where a Roth conversion strategy fits into a coordinated tax plan, and where it does not. A conversion is a precision instrument. Used well, it can shift meaningful dollars from a taxed future into a tax-free one. Used carelessly, it generates an avoidable tax bill and a permanent mistake, because conversions cannot be reversed once made [2].
The Decision Rests on Lifetime Rates, Not This Year's Return
The arithmetic of a conversion is simpler than most people assume. You come out ahead only when the rate you pay to convert is lower than the rate you would have paid on those dollars later [11]. In my experience, the households that benefit most are the ones with an uneven income profile: a business owner with a down year, an executive between equity vesting events, a couple with one spouse stepping back from work, or a family with a year of large deductible business losses.
In those years, there is room in the lower brackets that disappears if it goes unused. For a married couple filing jointly in 2026, the 22% bracket runs up to $211,400 of taxable income, and the 24% bracket up to $403,550 [4][5]. A conversion sized to fill the gap between current taxable income and the top of a target bracket captures that room at a known rate. The consumer-facing walk-through on Melby Money uses a single filer with $25,000 converted at 12%, growing to $179,723 in today's dollars over 30 years against a $39,539 tax bill erased; the same logic scales to a household converting six figures across several years.
Where the Pro-Rata Rule Changes the Plan
For clients above the direct Roth contribution limit ($242,000 for married couples filing jointly, $153,000 for single filers in 2026), the backdoor Roth is the standard entry point [16]. This is also where I see the most expensive self-inflicted errors. The pro-rata rule aggregates every traditional, SEP, and SIMPLE IRA a person holds when determining the taxable portion of any conversion [15]. A client who runs a clean backdoor contribution while holding a large rollover IRA discovers that most of the "after-tax" conversion is actually taxable.
The fix is sequencing. For many clients, that means rolling pre-tax IRA balances into a current employer 401(k) first, where they are excluded from the pro-rata calculation, before running the backdoor. Coordinating that across a custodian, a plan administrator, and a tax return is the kind of work that is hard to do well from a blog post.
A Conversion Is One Lever Among Several
I generally treat a conversion as part of a multi-year tax projection, not a standalone event. For most clients in this situation, the questions I am modeling include how a conversion interacts with capital gains brackets, deduction phase-outs created by the 2025 tax law, estimated-tax requirements, and state income tax, since Tennessee residents have no state tax on the conversion but a client planning a move would [11]. Each conversion also starts its own five-year clock, and the year-end execution deadline leaves no room for an April correction [13][14].
When Professional Guidance Adds Value
A single-account saver with one rollover IRA can often handle a conversion alone. The value of a fiduciary shows up when there are multiple account types, equity compensation, business income that swings year to year, and a long enough horizon that a multi-year conversion schedule meaningfully changes lifetime tax. In those cases, the work is building a year-by-year plan that fills the right brackets, sidesteps the pro-rata trap, and reconciles to the actual tax return. That is the coordination a static article cannot provide, and it is some of the highest-leverage planning I do.
For the consumer-facing version of this post, head over to Melby Money.
If you would like to map out whether a conversion makes sense for your situation, discuss your Roth conversion options with us.
About The Author
Shaun Melby, CFP® provides fee-only financial planning and investment management services in Nashville, TN through his company Melby Wealth Management. Shaun has over 15 years of experience as a financial advisor in Nashville. Shaun created Melby Money to educate the public about finances.
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