Asset Location in Retirement: Which Accounts Hold What

Asset allocation gets all the attention — 60/40 stocks and bonds, glide paths, rebalancing. Asset location is the less-discussed counterpart: which specific assets go in your Traditional IRA, your Roth, and your taxable brokerage account. In accumulation, the rules are fairly straightforward. In retirement, withdrawal sequencing and IRMAA management change the calculus in ways most retirees never model.

Asset location vs. asset allocation: the distinction that matters

Asset allocation is what you own — 40% US stocks, 30% international, 25% bonds, 5% cash. Asset location is where you own it.

Two retirees can have identical portfolios — same $1.5 million, same 60/40 stock-bond split — yet face very different annual tax bills depending on which assets sit in which account type. The retiree who holds bonds in the Traditional IRA and broad-market index funds in the Roth can pay significantly less in federal income tax each year than a retiree with the same portfolio in reverse order.

The difference compounds over decades. Done well, asset location reduces lifetime taxes on retirement income by tens of thousands of dollars. Done poorly — or ignored entirely — it generates unnecessary IRMAA Medicare surcharges, higher Social Security taxation, and missed 0% capital-gains opportunities.

The three account types and how they're taxed

The last column is the crux of retirement asset location: Roth withdrawals are invisible to both the IRMAA formula and the Social Security taxation formula. Every dollar you can source from Roth instead of Traditional IRA or taxable income is a dollar that doesn't push you toward Medicare surcharges or trigger more SS taxation.

The standard asset location framework — and its retirement twist

The general rule during accumulation:

• Tax-inefficient assets → Traditional IRA. Bond interest and REIT dividends are taxed as ordinary income. Holding them in a tax-deferred account postpones that bill.
• Tax-efficient assets → taxable account. Broad stock index funds generate minimal taxable events (low turnover, qualified dividends, tax-loss harvesting opportunities). International stock funds belong in taxable for the foreign tax credit.
• Highest-growth assets → Roth. Tax-free compounding is most valuable when applied to the fastest-growing assets over the longest time horizon.

In retirement, this framework still holds — but withdrawal sequencing adds a layer that many retirees overlook.

Asset-by-asset decisions in retirement

Bonds and bond funds

Where: Traditional IRA (primary), taxable (secondary if you hold muni bonds — with caveats below).

Bond interest is always ordinary income — in taxable, Traditional IRA, or Roth. There is no LTCG rate benefit for bonds. Deferring that ordinary income in the Traditional IRA until withdrawal makes sense for tax timing. More practically: if you're drawing from your Traditional IRA to fund spending, you naturally hold the assets you're spending — bonds — in that account. As you consume the bond bucket, you rebalance: sell stocks in the Roth or taxable to buy bonds in the Traditional IRA, keeping the overall allocation intact.

US stock index funds (broad market, qualified dividends)

Where: Taxable account (preferred) and Roth.

Total market and S&P 500 index funds have low turnover and generate qualified dividends — taxed at 0% for married couples with income below $98,900 in 2026.¹ In a taxable account, this income is lightly taxed or untaxed, and unrealized gains accumulate without annual tax drag. Tax-loss harvesting opportunities also exist only in taxable. Stocks also belong in the Roth for long-term growth compounding — whatever portion you don't plan to spend for 10+ years.

REITs (Real Estate Investment Trusts)

Where: Traditional IRA (strongly preferred).

REIT dividends are ordinary income — they are not "qualified dividends" eligible for lower rates. IRC §199A provides a 20% deduction on REIT dividends received in taxable accounts (made permanent under OBBBA), but this partial benefit is usually outweighed by the tax-deferral benefit of holding REITs in the Traditional IRA. In taxable, REIT dividends create an unavoidable annual ordinary-income event that also pushes MAGI toward IRMAA thresholds.

International stock funds

Where: Taxable account.

The foreign tax credit — which offsets some taxes paid to foreign governments on international stock dividends — is only available to the holder of record in a taxable account. Holding international stocks in a Traditional IRA or Roth surrenders that credit permanently. For most retirees, international funds belong in the taxable account unless the foreign tax credit benefit is small relative to other tax considerations.

High-yield bonds and actively managed funds

Where: Traditional IRA.

High-yield bond funds generate higher ordinary income than investment-grade bonds and have more frequent trading (taxable events in a taxable account). Both characteristics favor the Traditional IRA for tax deferral.

IRMAA and asset location: the $5,000/year variable

Medicare IRMAA surcharges apply when 2024 MAGI (the income year two years prior) exceeds thresholds. In 2026, the Tier 1 threshold is $109,000 for single filers and $218,000 for married filing jointly. Crossing Tier 1 adds $1,948/year per person in Medicare Part B and D surcharges — roughly $3,900/year for a couple. Tier 2 adds another $2,400/year per person.²

Asset location directly determines how much of your income lands in MAGI:

• Traditional IRA withdrawals: count 100% toward MAGI
• Taxable account dividends and realized gains: count toward MAGI
• Roth withdrawals: excluded from MAGI — zero IRMAA impact
• Social Security: 85% of SS benefits are taxable (for most retirees), but SS itself doesn't directly drive IRMAA — your investment income does

The practical implication: retirees with $1M+ in Traditional IRA face escalating IRMAA exposure as RMDs grow. Roth conversions done during the bridge period are the primary tool to reduce future Traditional IRA balances — but asset location is the ongoing management tool. A year where you need $90,000 in spending but only $60,000 needs to come from the Traditional IRA (the rest from Roth) can keep you below the IRMAA threshold, while the reverse — $90,000 all from Traditional IRA — may cross it.

Social Security provisional income: the muni bond trap

Provisional income determines how much of your Social Security benefits are subject to federal income tax. Under IRC §86:

• MFJ: 50% of SS benefits taxable when provisional income exceeds $32,000; 85% above $44,000
• Single: 50% of SS taxable above $25,000; 85% above $34,000

Provisional income = AGI + tax-exempt interest + ½ of SS benefits.

The trap: tax-exempt municipal bond interest is explicitly included in the provisional income formula. A retired couple earning $20,000 in muni bond interest each year — tax-free at the income tax level — still has that $20,000 counted toward provisional income, potentially pushing 85% of their SS benefits into the taxable column.

On $48,000 in Social Security, the difference between 0% and 85% taxable is $40,800 of additional taxable income — roughly $6,000–$9,000 in extra federal tax, depending on bracket. A portfolio that substitutes $20,000 in Roth withdrawals for $20,000 in muni bond income avoids this entirely: Roth distributions are excluded from AGI and from provisional income.³

Never hold muni bonds inside a Traditional IRA. The interest is already tax-exempt in a taxable account — holding it in a Traditional IRA means you pay ordinary income tax on the withdrawal, completely surrendering the exemption for no benefit. Muni bonds, if used at all, belong in taxable — but even there, run the provisional income math to confirm the SS interaction doesn't cost more than the income tax exemption saves.

Worked example: $1.5 million across three accounts

Robert and Karen, ages 67 and 65, MFJ. They have $1.5M total: $850K in a Traditional IRA (all accumulated pre-tax), $400K in a taxable brokerage, and $250K in a Roth IRA. Both plan to claim Social Security at 70. Their spending target is $72,000/year net of tax.

Asset allocation: 60% stocks ($900K), 40% bonds ($600K).

Poor asset location (before optimization)

Result: Robert draws from the Traditional IRA (stocks) for spending, triggering ordinary income tax on his realized gains. Meanwhile, bond interest in the taxable account creates annual MAGI. At $72K spending from the IRA plus taxable income, MAGI may approach $90,000+ — uncomfortably close to the IRMAA Tier 1 threshold at $109K single (though below $218K MFJ here, there is little Roth reserve to adjust).

Optimized asset location

The IRMAA reserve. In a year when Robert's IRA withdrawals would otherwise push MAGI toward $218,000 — perhaps if Roth conversions and RMDs coincide — he can reduce his Traditional IRA draw and substitute $15,000–$20,000 from Roth, keeping MAGI below the threshold. This flexibility disappears if the Roth is filled with low-growth bonds and the Traditional IRA is filled with stocks generating large future RMDs.

The bucket strategy connection

Asset location and the bucket strategy are natural partners:

• Cash bucket (0–2 years of expenses): money market or short-term CDs in the Traditional IRA — the account you're drawing from immediately
• Income bucket (3–8 years): intermediate bonds in the Traditional IRA — the next layer of the spending account
• Growth bucket (8+ years): stock index funds in taxable and Roth — accounts you won't touch for years, maximizing compounding

This structure means the bucket strategy isn't just about time horizons — it's automatically aligned with optimal asset location. The spending accounts hold the spending assets. The long-horizon accounts hold the long-horizon assets.

How Roth conversions shift asset location over time

Roth conversions — moving money from the Traditional IRA to the Roth each year during the pre-RMD, pre-SS bridge period — are the primary tool for improving asset location structurally. Each conversion:

1. Shrinks the Traditional IRA balance (reducing future RMDs and future IRMAA exposure)
2. Grows the Roth balance (increasing the IRMAA-neutral income reserve)
3. Allows you to rebalance: move bonds from Roth to Traditional IRA as Roth conversions transfer stock value to Roth

See the Roth Conversion Window Calculator to model how much you can convert each year within your bracket and below the IRMAA threshold.

Common asset location mistakes in retirement

1. Muni bonds in a Traditional IRA. Double waste: you surrender the federal tax exemption and gain nothing — the withdrawal is taxed as ordinary income anyway. Muni bonds only make sense in taxable accounts (and even there, verify the SS provisional income math).
2. Growth stocks in the Traditional IRA, spending assets in the Roth. This creates maximum future RMDs and forces you to eventually drain the Roth of growth assets. Reverse the order: spending assets (bonds) in the Traditional IRA, growth in the Roth.
3. Holding international funds in the IRA or Roth. Permanently surrenders the foreign tax credit. Unless the foreign credit is trivial, hold international equity in taxable.
4. Treating asset location as a one-time decision. As you draw down the Traditional IRA, rebalance across accounts to maintain target allocation and keep asset location aligned with withdrawal sequencing.
5. Ignoring the IRMAA reserve function of Roth. The Roth is not just a tax-free growth account — it's an IRMAA shock absorber for years when income spikes (Roth conversion year, large taxable gain, medical expense year).

When asset location matters less

Asset location has a smaller impact when:

• Almost all assets are in one account type (e.g., 90%+ in Traditional IRA with minimal Roth or taxable) — there's little to optimize across accounts
• Portfolio is small enough that all income falls in the 0% LTCG bracket and below IRMAA ($109K single / $218K MFJ) — marginal tax drag is low regardless
• Simple all-in-one portfolio (target date fund held in IRA) — asset location requires distinct assets to locate
• Asset base is being fully spent within 10 years — long-term compounding differences are less meaningful at short horizons

Frequently asked questions

Sources

1. IRS Rev. Proc. 2025-61 — 2026 Qualified Dividend and Capital Gains Tax Rates. 0% long-term capital gains rate for married filing jointly with taxable income up to $98,900; 15% rate up to $613,700; 20% above $613,700. Qualified dividends taxed at same preferential rates. Verified 2026.
2. CMS — 2026 Medicare Parts B and D Premiums and Deductibles. IRMAA Tier 1 threshold: $109,000 single / $218,000 MFJ (based on 2024 MAGI). Part B standard premium $202.90/month. Full IRMAA tier table in our Medicare IRMAA Planning Guide.
3. IRS Publication 915 — Social Security and Equivalent Railroad Retirement Benefits. Provisional income formula: AGI + tax-exempt interest + ½ SS benefits. MFJ thresholds: 50% of SS taxable above $32,000; 85% above $44,000. Tax-exempt municipal bond interest explicitly included in provisional income calculation under IRC §86.
4. Kitces — Asset Location in Retirement: How the Rules Change Once You're Spending Down. Professional analysis of how withdrawal sequencing alters optimal asset placement across account types in decumulation. Key insight: spending assets (bonds) should track to the spending account; growth assets track to the tax-free account.
5. Vanguard — Asset Location: A Key to Tax-Efficient Investing. General framework for asset location by account type; REITs in tax-deferred, international in taxable for foreign tax credit, broad stock index in Roth. Note: Vanguard guidance is accumulation-focused; retirement sequencing requires additional modeling.

Tax rates and IRMAA thresholds from IRS Rev. Proc. 2025-61 and CMS 2026. Social Security provisional income formula from IRS Pub. 915 (IRC §86 — unchanged by OBBBA). Asset location framework verified against Kitces and Vanguard guidance. Values current as of October 2026.