When do Roth conversion strategies make sense for wealthy clients?

Question

AcadiFi · Accepted Answer

A Roth conversion involves transferring assets from a pre-tax traditional IRA or 401(k) into a Roth IRA, paying ordinary income tax on the converted amount today in exchange for tax-free growth...

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Core break-even framework: convert when the investor expects higher marginal tax rates in the future than currently. If Rashida Osei is in a temporary low-income year at 24% marginal rate (between jobs) but expects 37% retirement rate, converting $500K now costs $120K tax; leaving it pre-tax eventually costs $185K at 37% on the same balance assuming flat growth. The $65K savings represents conversion alpha.

Beyond simple rate comparison, additional scenarios where Roth conversion helps:
(1) Paying tax from outside funds — using taxable-account cash to pay the conversion tax effectively 'shelters' more wealth because $500K of traditional IRA fully converted preserves $500K in Roth, versus paying tax from the IRA which reduces the sheltered balance.
(2) Heirs in high brackets — inherited Roth IRAs continue tax-free for up to 10 years of post-death required distributions; inherited traditional IRAs are taxed at heirs' (possibly high) ordinary rates.
(3) Reducing future RMDs — Required Minimum Distributions from traditional IRAs starting at age 73 can push retirees into higher brackets; Roths have no lifetime RMDs.
(4) Estate tax concerns — the conversion tax effectively removes assets from the taxable estate.
(5) Locking in current rates — clients expecting tax rate increases (legislative risk) may convert preemptively.

```mermaid
flowchart TD
  A[Conversion Decision] --> B{Rate Now vs Later?}
  B -->|Lower Now| C[Convert]
  B -->|Higher Now| D[Wait]
  C --> E[Pay Tax Today]
  E --> F[Tax-Free Forever]
```

Scenarios where Roth conversion hurts: low-bracket retirees with no estate concerns, clients needing the funds soon (less time for tax-free compounding to offset upfront tax), and those unable to pay conversion tax from outside assets (partial conversion still possible).

Worked illustration: the Takahashi-Berglund household, ages 62 and 60, has $3.2M in traditional IRAs. They plan a 'conversion ladder' — converting $200K annually for 8 years during low-income early retirement years before Social Security starts, keeping themselves in the 24% bracket. Total tax = $384K. Compared to waiting until RMDs force distributions at 32-35%+ marginal rates, the conversion ladder saves an estimated $400K+ over a 25-year retirement horizon plus eliminates RMDs and enhances legacy value. For CFA Level III, frame conversion as a present-value tradeoff — prepaying tax at known current rate versus deferring at uncertain future rate — and quantify the after-tax wealth differential over the planning horizon.

When do Roth conversion strategies make sense for wealthy clients?

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