Pension Lump Sum, a Roth Conversion Window, and ACA Subsidies

The life-only annuity pays $28,800 per year on a $410,000 lump sum, a 7.0% payout rate. That is attractive relative to a 4% portfolio withdrawal rate, which would produce only about $16,400 per year. But the comparison is incomplete. The annuity is life-only, so Susan receives nothing if Robert dies first. A joint-and-survivor option, perhaps 100% or 50% to the survivor, will pay less but protects the spouse. Robert should request the exact joint-and-survivor amounts, the plan's funding status, the PBGC guarantee limits, whether there is a cost-of-living adjustment, and whether the lump sum can be rolled to an IRA without tax. He should also confirm whether the pension has a survivor benefit for a pre-retirement death and whether the lump sum changes if he delays to 65.

Beyond the rate: mortality and health. If Robert is in poor health, the life-only annuity is less attractive. If he is healthy and the plan is well funded, the annuity provides longevity insurance that a portfolio cannot easily replicate. Inflation is a major risk because the pension appears fixed; $28,800 loses purchasing power over 25 years. Liquidity and flexibility matter: the lump sum can be invested, used for Roth conversions, or left to heirs, while the annuity cannot. Credit risk matters: a single-employer pension is protected by the PBGC, but within limits, while an IRA is not insured against market loss.

A reasonable decision rule: if a joint-and-survivor annuity is available at a payout that still exceeds a conservative portfolio withdrawal rate, and the plan is sound, take the annuity for the longevity and survivor protection. If not, roll the lump sum to an IRA and invest conservatively, but recognize that the portfolio must support a 4% to 4.5% withdrawal rate. Do not compare the 7.0% payout with a 7.0% portfolio return; the annuity returns principal as well as income.

Robert's RMD age is 75 under SECURE 2.0 because he was born in 1961. The conversion window is therefore ages 64 to 74, but it is not equally open. From 64 to 65, Robert needs ACA coverage and Susan needs it until 65. Premium tax credits are based on household MAGI, so every dollar of conversion raises MAGI and reduces the subsidy. Large conversions during these years are usually inefficient: the lost subsidy can amount to an effective marginal tax rate well above the nominal bracket. The first planning step is to estimate the subsidy loss per $1,000 of conversion and compare it with the future tax rate on the same dollars.

From 65 to Susan's 65, Robert is on Medicare but Susan is still on an ACA plan. The household MAGI still controls her subsidy, so conversions remain constrained, though perhaps less so if Susan's plan is modest. After Susan reaches 65, both are on Medicare and the ACA constraint disappears. That is the prime conversion window, from about Susan's 65 to Robert's 75.

IRMAA uses a two-year lookback. Income in 2026 sets Medicare premiums in 2028. Before converting, estimate the IRMAA threshold for the relevant year and decide whether to convert to just below it or accept a known surcharge. IRMAA is a cliff, not a phase-in, so a conversion that crosses a threshold by $1 can cost more than the tax on the last dollar. The plan should use a bracket-filling target: convert to the top of the 22% or 24% bracket only after accounting for the ACA subsidy and IRMAA. In the early years, do small conversions or none; in the later years, do larger conversions. Keep the taxable brokerage and cash to fund living expenses so that conversions are not forced to be larger than planned.

If Robert takes the joint-and-survivor annuity, the pension becomes a base income floor. If he takes the lump sum, the IRA must provide more of the floor, which argues for a conservative withdrawal rate and a larger cash reserve. In either case, the sequence should protect the survivor and manage taxes.

Social Security: Robert should generally delay to 70. His benefit at 67 is $2,900; at 70 it is about 24% higher, roughly $3,596 per month, and the survivor benefit is based on his higher amount. Susan can claim at 67, when she receives her own $1,300, and the household gains the larger survivor floor if Robert dies first. If cash flow is tight before 70, use the taxable brokerage and cash, not early Social Security, because the delayed benefit is effectively an inflation-adjusted annuity.

Account order: spend cash and taxable brokerage first to allow Roth conversions and to preserve tax-deferred growth, but do not drain the taxable account so far that it loses its role as a tax buffer. Use the 401(k) for living expenses once the taxable account is reduced, and use Roth withdrawals strategically to keep MAGI below ACA and IRMAA thresholds. Before 65, keep MAGI low for Susan's subsidy. After both are on Medicare, fill the 22% or 24% bracket with conversions and use the Roth later for large or lumpy expenses.

Guardrails: maintain two to three years of spending in cash and short bonds; revisit the conversion plan annually; do not convert at the expense of the emergency reserve; and coordinate the pension survivor election with the Social Security survivor benefit. The goal is a tax-efficient income floor, not the lowest tax bill in any single year.