OBBBA rewrites the Roth conversion calendar

The useful way to think about a Roth conversion now is the way estate planners think about exemptions: as something to be used in the right year, and the One Big Beautiful Bill Act is the reason. Last July's law permanently extended the 2017 tax rates and expanded a set of deductions, draining some of the urgency that once pushed clients to convert before rates climbed while giving advisors new room to time a conversion against a client's actual income picture.

In the accounts advisors gave Financial Planning, the strategy survives but narrows: Roth conversions still make sense to trim future required minimum distributions, sharpen estate planning, and start a tax-free compounding stream that can run for decades, but the operative word is timing. "This is a year-by-year thing," said Alex Velazquez, a senior vice president at Carnegie Investment Counsel in Stamford, Connecticut, who pointed to a large carryover loss from a business sale, a charitable gift that temporarily lowers adjusted gross income, or a stretch of years before deferred income or a pension begins as events that can turn a conversion year into a bargain. Velazquez cautioned that the bargain has an ugly first act, because in the first few years after a conversion clients can feel worse off than if the money had stayed in a traditional IRA, the tax bill real and immediate; the benefit lands later, once the Roth balance compounds free of future taxes and the client's lifetime tax burden drops. He called the decision "unthinkable" to some clients, and he pushed advisors to make the call in tandem with the client's tax professional.

The law's deduction changes are what make the timing exercise worthwhile, according to Bradford Houchins, a senior vice president at River Wealth Advisors in Camp Hill, Pennsylvania, who pointed to a higher standard deduction, an enhanced deduction for seniors, and a new 2026 deduction of up to $1,000 per person for cash charitable donations, changes that let high earners, lower earners, and retirees convert more efficiently than before the law.

The clearest opening may be the gap years: clients who retire before claiming Social Security often spend a few years in a lower bracket, and Houchins said the deduction stack makes that window more useful for conversions, where Velazquez's longevity test applies. The conversion is not just an arbitrage against future rates but a decision about how many years the Roth will compound after the tax is paid. A client converting at 60 has a different answer than one converting at 75, and the difference shows up in every RMD projection and estate plan.

The OBBBA's real effect is down at the desk level: the permanent rate extension means no one has to convert out of fear, and the deduction menu means the question is whether this year's losses, gifts, and income gaps can absorb the tax cost. As returns commoditize, tax alpha is becoming the visible skill advisors compete on, and Roth conversion sequencing is one of its sharpest tools. The firms that build a conversion review into every decumulation plan, checking for losses and charitable gifts and gap years on a set schedule, will own the relationship through the next decade; the firms that wait for clients to raise the subject will spend those years explaining why last year's window closed.