How to Invest a Pension Rollover: IRA Investment Strategy After the Lump Sum

You've made the decision, executed the direct rollover, and now your pension lump sum — $500,000, $900,000, $1.5 million — is sitting in a traditional IRA money market fund waiting to be invested. Most people spend months agonizing over the lump sum vs. annuity decision, then move the money to an IRA and invest it exactly like a generic retirement account. That's a mistake. A pension IRA is different from a 401(k) rollover IRA in ways that change the optimal investment strategy — particularly around asset allocation, Roth conversion timing, and long-term tax management.

The first 90 days: don't invest on autopilot

When your pension lump sum arrives in the IRA, the custodian will typically park it in a money market fund or cash sweep — currently yielding around 4–5%. That's fine for a few months. The mistake is investing it immediately out of a sense of urgency, or defaulting to the same allocation you used in your 401(k) without accounting for what you now own.

Before investing a pension rollover, three questions should shape the decision:

1. Do you still receive any pension annuity income? If you took a partial lump sum and kept the rest as an annuity, or if you have a separate defined-benefit pension from another employer, that annuity income functions like bond income and changes your IRA allocation.
2. How long until Social Security, and at what amount? Delayed Social Security is also bond-like income — a government-guaranteed, COLA-adjusted lifetime stream. Knowing its size and timing tells you how much income coverage you already have before touching the IRA.
3. What's your RMD timeline? A 62-year-old rolling an $800K pension has 11–13 years before forced distributions. A 68-year-old has 5–7 years. The time horizon shapes the allocation and the urgency of Roth conversion.

The pension-as-bond insight

The most important concept in pension rollover investing is the one most generalist advisors miss: a pension annuity functions economically like a bond.

If you elected to keep part of your benefit as a monthly annuity — say, $3,200/month for life — that stream has a present value. At a 4% discount rate and a 25-year life expectancy, $3,200/month is worth roughly $600,000 in present-value terms. That $600,000 bond-equivalent is already in your retirement portfolio. You just can't see it on a brokerage statement.

Why does this matter? Because standard age-based asset allocation rules (e.g., "hold your age in bonds") don't account for income from sources outside the portfolio. If you've got $600K in "bond-equivalent" pension income plus a $900K IRA, your total retirement portfolio is ~$1.5M. A 60/40 portfolio implies $600K in bonds — but you already have that in the pension. Putting 40% of the IRA in bonds too means you're holding roughly $960K in bond-equivalent assets on a $1.5M portfolio. That's closer to 35% equity than the 60% you thought you were running.

Quantifying the pension-as-bond adjustment

Present-value approximations using standard annuity formula. Actual value depends on exact longevity, discount rate, and survivor provisions.

The same logic applies to Social Security. A couple collecting $50,000/year combined in Social Security has roughly $800,000–$1 million of bond-equivalent value embedded in that guaranteed stream. A fee-only advisor constructing an IRA allocation properly accounts for all these guaranteed income streams — not just what's in the brokerage account.

Asset allocation frameworks for pension IRA investors

If you have substantial annuity + Social Security income

For retirees whose combined pension annuity + Social Security covers most living expenses, the IRA serves primarily as a legacy and discretionary spending vehicle — not a primary income source. In this case:

• The IRA can hold a higher equity allocation (70–80%) since income risk is already mitigated by the guaranteed streams.
• Bond allocation inside the IRA may be unnecessary beyond what's needed for near-term distributions.
• The IRA becomes the primary vehicle for Roth conversions, since you can afford to take the tax hit in the early retirement years.

If the IRA is the primary income source

For retirees who took the full lump sum and have no remaining annuity, or where Social Security alone is modest, the IRA must generate reliable income. In this case:

• A bucket approach — 1–2 years of spending in cash/short bonds, 3–5 years in intermediate bonds, balance in equities — provides income stability without sacrificing long-term growth.
• The equity allocation should still be substantial (50–65%) for a 62–65-year-old with a 25-year horizon. Undershooting equity exposure is a real risk — running out of money is worse than volatility.
• Bond selection matters: TIPS (inflation-protected) are appropriate for pension IRA holders concerned about inflation, since there's no pension COLA anymore to compensate.

Asset location within the IRA

If you have both a traditional IRA and a Roth IRA (whether from prior contributions or ongoing conversions), consider asset location:

• Traditional IRA: Allocate bonds, dividend-payers, and REITs here — their income is taxed when distributed regardless of account type, so there's no particular cost to sheltering them in Roth.
• Roth IRA: Put your highest-growth assets here — small-cap equity, international growth. Roth growth is tax-free forever; you want the assets with the highest expected appreciation in that account.

The Roth conversion window: your most valuable planning tool

For most pension rollover investors, the window between retirement (typically age 60–65) and when Social Security + RMDs push income higher (typically age 70–75) is the best tax planning opportunity in retirement. This window may be 8–12 years long and usually won't come again.

In this window, your taxable income often drops significantly:

• No more earned income from work
• Social Security not yet at full rate (or being intentionally delayed)
• RMDs haven't started yet
• Investment income from a conservative allocation may be modest

That creates room in the lower federal brackets — often $50,000–$100,000 of capacity — to convert traditional IRA dollars to Roth, paying a manageable tax rate now to eliminate the tax obligation on future growth.

How the math works (married couple, both age 65)

Using 2026 tax values:¹

• Standard deduction (MFJ): $32,200
• Additional standard deduction (both age 65+): $3,300
• OBBBA senior bonus deduction: $12,000 (at full phase-in, below $150K MAGI)
• Total deductions: $47,500
• Top of the 12% bracket (MFJ): $100,800 of taxable income → $148,300 of gross income before deductions

If this couple has pension income of $36,000/year (annuity portion they kept) and Social Security of $20,000/year (starting early while converting) — that's $56,000 of gross income. They have roughly $92,000 of room to the top of the 12% bracket. Converting $90,000 of traditional IRA to Roth at 12% costs roughly $10,800 in federal tax — but eliminates that tax obligation permanently.

After age 73 or 75, when RMDs begin, their traditional IRA balance is smaller, their RMDs are smaller, and the combination of pension + SS + RMDs may keep them in the 12% bracket permanently rather than getting pushed into 22% or 24% by large required distributions.

See our full RMD guide and IRMAA guide for the specific bracket tables and break-even calculations.

Sequence-of-returns risk for pension IRA holders

Sequence-of-returns risk — the danger that a market crash early in retirement depletes a portfolio before it can recover — is genuinely different for pension rollover investors than for retirees with no guaranteed income.

If your pension annuity or Social Security covers your basic living expenses, you don't need to sell IRA assets during a down market. You can leave equities untouched and wait for recovery. This changes the practical risk profile of your IRA.

Conversely, if you rolled the full lump sum and have no other income, every dollar of living expense must come from the IRA, even in a down year. In that scenario, building a 1–2 year cash buffer (in a high-yield savings account or money market fund within the IRA) insulates you from forced selling.

The IRMAA risk: managing Medicare surcharges from IRA income

Medicare Part B premiums are not fixed — they increase based on income. The 2026 IRMAA surcharge tiers are based on income from two years prior (so your 2026 premiums reflect 2024 income).²

2026 IRMAA thresholds and Medicare Part B premiums per CMS.gov. Surcharges are based on 2024 MAGI (2-year lookback). IRMAA applies per person — a couple in Tier 2 pays $2,435 × 2 = $4,870/year combined.

For pension IRA holders, two events commonly trigger IRMAA brackets:

1. Roth conversions that are too large. Converting $150K in a single year may push your MAGI over the first IRMAA tier ($109K single / $218K MFJ), costing $974–$2,435/year in additional Medicare premiums two years later. Spreading conversions across multiple years to stay below tier thresholds is standard practice.
2. Large RMDs from a fully-deferred traditional IRA. If you didn't convert and your $1.2M IRA forces $50,000+ RMDs, the combination with pension and Social Security can land you permanently in the first or second IRMAA tier. That's $974–$2,435/year extra per person — roughly $40,000–$100,000 in lifetime Medicare surcharges for a couple over a 20-year retirement.

The solution is proactive income management: stay aware of your IRMAA thresholds and treat Roth conversion amounts as a precision tool, not a blunt instrument.

Tax-efficient withdrawal sequencing

Once you begin drawing income from the IRA (whether voluntary or via RMD), the sequence of which accounts to draw from matters for long-term tax efficiency:

1. Cover living expenses from guaranteed income first: Pension annuity + Social Security + any interest/dividends from taxable accounts. This minimizes IRA withdrawals while you're in the conversion window.
2. Convert traditional IRA to Roth each year up to your bracket ceiling: Don't let the account grow faster than you're converting. The goal is to keep the traditional IRA from ballooning into an RMD problem.
3. Once RMDs begin: Take the RMD first (it's mandatory), then coordinate any additional spending with Roth conversions and Roth IRA distributions (which are tax-free and have no RMDs during your lifetime).
4. Leave Roth IRA alone as long as possible: Roth grows tax-free, has no RMDs in your lifetime, and is the best asset to pass to heirs who inherit it (10-year rule after SECURE 2.0, but tax-free growth still benefits them).

Common post-rollover investment mistakes

1. Treating the IRA as a "set it and forget it" account

Parking $900K in a target-date fund and not reviewing it annually is a mistake for pension rollover investors. Target-date funds are calibrated for someone who only has 401(k) savings — they don't know you have a $3,500/month pension. The fund may be overallocating to bonds when your pension already provides that income.

2. Under-converting during the early retirement window

Deferring Roth conversions to "keep taxes low now" feels prudent but often backfires. The traditional IRA grows; RMDs force higher distributions; IRMAA kicks in. Paying 12–22% now on conversions is usually better than paying 22–32% on involuntary RMDs later at a time when you have less flexibility.

3. Over-converting in a single year

The opposite mistake. Converting too much in one year — say $300,000 to "get it done" — spikes your income for that year, potentially triggering IRMAA two years later, plus paying a higher rate on the top slice of conversions. Spreading conversions at $60,000–$100,000/year over 8–10 years is usually more tax-efficient than front-loading.

4. Ignoring Social Security in the income plan

Many pension holders delay Social Security while doing Roth conversions — which is often smart, since delaying SS earns 8%/year in increased benefit from age 62 to 70. But running the conversion math without incorporating your future SS income leads to over-converting (converting income that would have been in the 12% bracket anyway if SS were included) or under-converting (thinking you have more room than you do once SS starts).

5. Not having a spending policy

Without a clear rule for how much you can withdraw each year, large one-time expenses (new roof, car, medical bill) can come disproportionately from the IRA in a high-income year, triggering a bracket or IRMAA tier unnecessarily. Having a spending policy — separate from the investment allocation — prevents reactive distribution decisions.

When to involve a fee-only advisor

Not every post-rollover investor needs ongoing advisory management. But the complexity rises significantly when any of the following apply:

• IRA balance is over $500,000 — the tax planning decisions (Roth conversion amount, RMD management, IRMAA optimization) are worth professional modeling
• You have multiple retirement income sources (pension annuity + partial lump sum IRA + spouse's pension + Social Security + maybe a 401(k)) — coordinating these for optimal tax sequencing is non-trivial
• You need to coordinate the IRA with estate planning (spouse's survivor benefits, inherited IRA rules for children, charitable strategies like QLACs or QCDs)
• Healthcare costs and IRMAA management are a concern — active premium management across a 15–20 year Medicare enrollment period can save more than the advisory fee

Fee-only advisors charge a flat fee or hourly rate — there's no commission incentive to push you toward higher AUM. For a one-time investment strategy review and Roth conversion plan, a flat fee of $2,000–$5,000 is common. For ongoing investment management, expect 0.5–1% of AUM annually.

Related guides

• RMDs After Pension Rollover: Managing Your Required Distributions
• Pension Income and Medicare IRMAA: How to Avoid Surcharges
• Pension Lump Sum Tax Strategies: Roth Conversion and Bracket Management
• Pension Rollover to IRA: Execution Guide
• Lump Sum vs Annuity Calculator
• 8 Costly Pension Rollover Mistakes

Sources

1. IRS Rev. Proc. 2025-32 — 2026 inflation-adjusted tax brackets, standard deductions, and senior deduction amounts; IRS.gov. OBBBA senior bonus deduction per Public Law 119-X (July 2025).
2. CMS.gov, "2026 Medicare Parts A & B Premiums and Deductibles" — 2026 Part B premium and IRMAA surcharge tiers; cms.gov.
3. IRS Publication 590-B — Uniform Lifetime Table divisors and RMD calculation rules; SECURE 2.0 Act §107 (RMD age to 73/75); irs.gov.
4. IRC §408(a) (traditional IRA), §408A (Roth IRA), §401(a)(9) (RMD rules). Roth IRA exemption from lifetime RMDs per IRC §408A(c)(5).

Tax values verified as of May 2026. Consult a tax professional before making investment decisions based on this material.