Who: custodial platforms and retirement account holders across the U.S.; What: a continuing rise in Roth conversions aided by simplified, “one‑click” workflows on brokerage and plan platforms; When: through September 2026; Where: U.S. retirement plans and IRAs; Why: lower friction, temporary low‑income years for some retirees, market volatility and the planning effects of tax‑law changes such as SECURE 2.0.

Context: why one‑click tools matter in 2026

Since mid‑2024 custodial platforms and fintechs have accelerated investments in user experience for Roth conversions: guided flows, in‑screen tax estimators, pro‑rated cost‑basis calculators and automated 1099‑R reporting. The operational drag that once made conversions an adviser‑led, multi‑week project has been reduced to minutes for many account owners. That lower friction interacts with two durable drivers: (1) planning windows when retirees have temporarily low taxable income—between stopping work and starting Social Security or pensions—and (2) tax‑law timing under SECURE 2.0.

SECURE 2.0, enacted December 2022, increased the required minimum distribution (RMD) age to 73 beginning in 2023 and includes a staged increase to age 75 in future years (the statutory schedule phases in higher ages over the coming decade). That change gives some owners more runway to plan RMD exposure and has amplified interest in Roth conversions as a tool to manage taxable income later in retirement.

Specific mechanics and what changed (operational and tax basics)

  • Tax now, tax‑free later: Converting pre‑tax funds to a Roth—either a Roth IRA or in‑plan Roth 401(k) balance—triggers ordinary income tax on the converted amount in the year of conversion.
  • RMDs: Roth IRAs remain exempt from RMDs for original owners. Roth 401(k) balances still generally have RMDs while retained in the plan; many owners continue to roll Roth 401(k) balances to Roth IRAs to avoid those RMDs, subject to plan rules and timing.
  • Medicare look‑back: Medicare IRMAA and Social Security taxation use modified adjusted gross income (MAGI) from tax returns—Social Security and Medicare use a two‑year look‑back for Medicare premiums—so a conversion in 2026 can affect Medicare premiums for two years (e.g., 2026 conversion affects 2028 Medicare Part B/D premiums).
  • Five‑year rule: Each Roth conversion is subject to a five‑taxable‑year clock for penalty‑free qualified distributions of converted amounts if the owner is under age 59½. The five‑year buckets remain a common pitfall.

Fresh examples and practical numbers

Consider a 2026 hypothetical: a retiree with $35,000 taxable income who converts $100,000 from a traditional IRA to a Roth. If the conversion pushes the retiree into a higher marginal tax bracket for 2026, the tax bill could be meaningful—using a 22% marginal rate as an example means roughly $22,000 of federal tax due (state tax would be additional). Paying that tax from cash outside the IRA preserves more of the converted principal for tax‑free growth.

Another example: a partial conversion of $25,000 in a year between employment and Social Security can often be executed to fill lower tax‑bracket space without triggering higher Medicare IRMAA thresholds. The specific bracket breakpoints change annually; model conversion amounts against the current year's brackets before acting.

New trends and industry response in 2026

Platform changes have shifted the adviser workflow. Where many advisers once spent hours on paperwork, they now spend that time on scenario modeling. Advisers report (anecdotally) more clients asking for multi‑year conversion roadmaps. For carriers and plan administrators, the priorities in 2026 are improving tax‑estimation accuracy inside conversion flows, adding warnings about IRMAA impacts, and coupling conversion tools with beneficiary review prompts.

Plan sponsors and RIAs are increasingly integrating conversion decisions into broader retirement cash‑flow planning: running net‑of‑tax projections, mapping conversions to Social Security claiming strategies, and stress‑testing for health‑care premium exposure. For owners close to the new RMD ages under SECURE 2.0, advisers are presenting conversion windows that fit between stopping work and becoming subject to RMDs.

Impact: who is affected and how

  • Near‑retirees and early retirees: Those who stop work before claiming Social Security or pension benefits have the largest tactical opportunity to convert in low‑income years.
  • Medicare beneficiaries: Conversions can trigger higher Part B and D premiums for two years because of the Social Security/Medicare two‑year MAGI look‑back.
  • Estate plans: Converting substantial IRA balances changes the character of inherited accounts. A beneficiary who inherits a Roth IRA generally receives tax‑free distributions (subject to the 10‑year rule for many non‑spouse beneficiaries implemented under the SECURE Act), so conversions can be useful in estate tax and legacy planning—but they must be coordinated with beneficiary designations.
  • State taxpayers: State income tax treatment varies. Movers should model both the state tax at conversion and expected future state residence.

Common pitfalls—updated for 2026—and how to avoid them

  • Paying the tax from the converted account: Still a common error. That reduces the converted balance and can negate expected tax‑free growth. Where possible, pay conversion taxes from non‑retirement cash.
  • Under‑modeling IRMAA and Social Security taxation: Run MAGI projections and remember Medicare uses a two‑year look‑back—plan conversions two years before you expect higher IRMAA exposure if possible.
  • Ignoring the five‑year rule and sequential conversions: Each conversion opens its own five‑taxable‑year clock for penalty treatment. Label conversions in recordkeeping and advise clients on timing if they expect to access funds soon.
  • Rollover timing: If rolling a Roth 401(k) to a Roth IRA to avoid RMDs, confirm plan distributions and blackout dates; some employers limit in‑service rollovers or impose waiting periods.

Actionable checklist for September 2026

  • Run a multi‑year, net‑of‑tax projection for any conversion amount that includes federal and state tax, Social Security taxation, and IRMAA impact.
  • Coordinate conversions with Social Security claiming and pension start dates; identify low‑income windows between employment and benefit starts.
  • Prefer to pay conversion taxes from outside retirement accounts when feasible; estimate withholding and quarterly payment needs to avoid underpayment penalties.
  • Stagger conversions across years to manage marginal rates and IRMAA thresholds; use partial conversions to fill bracket space.
  • Confirm in‑plan rules before converting: verify whether Roth 401(k) balances can be rolled to a Roth IRA and the timing implications for RMDs.
  • Review beneficiary designations and estate documents after conversion; consult an estate attorney for large or complex estates.

Reactions from the field

Financial planners and plan administrators describe the firm-level reaction as pragmatic: operational improvements from custodians are welcomed, but advisers say the real work remains in multi‑year tax planning. Custodial one‑click features have accelerated decision execution, making pre‑transaction modeling and client communication ever more important.

What to watch next

  1. Annual tax‑bracket and standard deduction inflation adjustments from the IRS for 2027—these will affect conversion sizing and should be reviewed when planning late‑year 2026 conversions.
  2. Any state legislatures considering changes to state Roth conversion tax treatment; moving residence remains an important lever.
  3. Plan fiduciary guidance and platform UX updates—watch for enhanced IRMAA flags and integrated beneficiary checks within custodial conversion flows.

How should a popular, simple scenario be handled?

Example: A 62‑year‑old who stopped work in 2026 with $40,000 taxable income, planning to claim Social Security at 67, could convert a portion of a pre‑tax IRA in 2026 to use lower bracket space. The adviser-run plan would: (1) model conversion amounts against projected MAGI and IRMAA, (2) prefer paying tax from cash, (3) split the conversion across two years if necessary, (4) document the five‑year rule implications, and (5) confirm beneficiary designations.

FAQ

Will a Roth conversion in 2026 affect my Medicare premiums immediately?

Not immediately. Medicare Part B and D premiums are set using a two‑year look‑back of MAGI reported to Social Security. A conversion in 2026 would typically affect Medicare premiums in 2028 under current procedures, so plan conversions with that two‑year timing in mind.

Can I avoid RMDs by converting to a Roth 401(k) instead of a Roth IRA?

No. Roth 401(k) balances are generally still subject to RMD rules while held inside the employer plan. Rolling Roth 401(k) funds to a Roth IRA (when allowed) is the usual way to eliminate future RMDs for the original owner; confirm plan rules and any employer blackout periods before moving funds.

Should I always pay conversion taxes from outside retirement accounts?

Paying taxes from outside the retirement account preserves more of the converted principal for tax‑free growth and avoids reducing the account balance. It’s generally recommended when cash is available, but individual liquidity, tax brackets and estate goals can change that recommendation—model both approaches before deciding.

How far in advance should I model Roth conversions?

Start multi‑year modeling at least 12–24 months before large conversions to test bracket impacts, IRMAA exposure and Social Security timing. For calendar‑year conversions, run a preliminary model 3–6 months ahead and finalize withholding or estimated tax payments before year‑end.

Bottom line: One‑click conversion tools have reduced the operational barriers, but tax timing, Medicare rules and estate consequences still require careful planning. In September 2026 the conversion decision is less about paperwork and more about strategy—do the modeling first, then use the new tools to execute precisely.