Where to hold what

Part of Financial 101 › Tax. General information about US federal tax rules for tax year 2026, not tax advice. State rules differ. Figures come from IRS Revenue Procedure 2025-32 and IRS Notice 2025-67 and change yearly; the IRS is the source of truth. For your own situation, see when you need a CPA.

Not to be confused with allocation

Asset allocation is how much you hold in stocks versus bonds. Asset location is which account each of those sits in. The first decides your risk and return. The second decides how much of that return you keep, and it is the most overlooked lever an index investor has — because it costs nothing, requires no forecasting, and compounds for decades.

Why it matters: three kinds of income, three tax treatments

Interest — from bonds, bond funds, savings — is taxed as ordinary income at your marginal rate every year it is paid.

Qualified dividends and long-term capital gains — from stocks held more than a year — are taxed at preferential rates: 0%, 15%, or 20% depending on income, with an extra surtax at higher incomes. Many retirees and moderate earners sit inside the 0% band without knowing it.

Unrealised gains are not taxed at all until you sell. A broad stock index fund that you hold for thirty years defers most of its growth the whole time.

So the same dollar of return can be taxed at your full marginal rate every year, at a lower rate, or not at all for decades. Location is about matching each investment to the account where its particular tax treatment does the least damage.

The three account types

Tax-deferred (traditional 401(k), traditional IRA): no tax on anything inside; ordinary income tax on withdrawal.

Tax-free (Roth 401(k), Roth IRA, HSA used for medical): no tax inside, no tax on qualified withdrawal.

Taxable (ordinary brokerage): interest and dividends taxed yearly, gains taxed on sale, but with the preferential rates and the ability to defer.

The general rule

Holding	Best home	Why
Bond funds	Tax-deferred	Interest would be taxed at your full rate every year in taxable; sheltering it saves the most.
Broad stock index funds	Taxable (or anywhere)	Low turnover, mostly qualified dividends, gains deferred until sale, preferential rates.
Highest expected growth	Roth	Growth is never taxed, so the account with the most upside benefits most.
REITs, high-yield bonds, actively traded funds	Tax-deferred	Ordinary-income distributions and frequent gains are expensive in taxable.
International stock funds	Often taxable	The foreign tax credit for withheld taxes is only available in a taxable account.

Two caveats keep this honest. First, the ranking of bonds and stocks can flip when bond yields are very low or when your tax-deferred space is the only place you can hold anything — the rule is a default, not a law. Second, none of this overrides allocation. Hold the stock/bond split you chose; use location to decide where the pieces go.

A worked example, hypothetical

Suppose a household wants 70% stocks and 30% bonds across $300,000 in three accounts: $150,000 in a traditional 401(k), $75,000 in a Roth IRA, $75,000 in taxable. A tax-aware placement puts the $90,000 of bonds entirely in the 401(k), fills the rest of the 401(k) with a stock index fund, puts all Roth money in stocks, and holds only a broad stock index fund in taxable. The household still owns exactly 70/30. But its bond interest is sheltered, its most growth-exposed dollars are in the account where growth is never taxed, and its taxable account throws off only qualified dividends. Rebalance by moving money inside the 401(k) rather than by selling in taxable, and the tax bill from the whole arrangement is close to nothing for years.

Two related tools

Tax-loss harvesting. In a taxable account, selling a fund at a loss and immediately buying a similar (but not identical) one realises a loss that offsets gains and a limited amount of ordinary income each year, while keeping you invested. The wash-sale rule disallows the loss if you buy a substantially identical holding within 30 days either side, including in an IRA. Useful in a downturn; not worth chasing in small amounts.

Gain harvesting. The mirror image: in a low-income year — early retirement, a sabbatical — realising long-term gains up to the top of the 0% band resets your cost basis at no tax cost. This is one of the more valuable moves available to someone in the gap years before Social Security, and it pairs with Roth conversion planning.

Checklist

Allocation chosen first, across all accounts combined · Bonds placed in tax-deferred where space allows · Taxable account holds only broad, low-turnover stock index funds · Roth holds the highest-growth slice · Rebalancing done inside tax-advantaged accounts first · Loss-harvesting checked after large declines · Gain-harvesting checked in any low-income year.

Related: Index funds and the three-fund portfolio · How deductions work · Retirement planning