Which account holds which asset changes your return without changing your risk

Tax dragTax dragThe return lost each year to tax on dividends, interest and realised gains along the way, rather than at the end. Like a fee, it compounds against you for as long as your returns compound for you.Read the evidence on this → scales with how much taxable income an asset throws off each year. A bond fund distributing interest taxed as ordinary income leaks far more annually than a broad equity index fundIndex fundA fund that holds whatever a published index holds, in the same proportions, without a manager choosing. Its selling point is not clever construction but low cost and no dependence on a manager's continued skill.Read the evidence on this → that pays a modest qualified dividend and defers most of its return into unrealised gains. If some of your money sits in a 401(k) or IRA and some in a taxable brokerage account, which asset goes where is a free variable — and it changes the after-tax result while leaving the risk profile untouched.

Dammon, Spatt and Zhang solved the joint allocation-and-location problem and found the location effect is first-order rather than a rounding error: for realistic parameters, holding taxable bonds inside the shelter and equities outside it produced meaningfully higher lifetime consumption than the reverse. The intuition is that the shelter is scarce, so it should be spent on the asset it protects most.

Bergstresser and Poterba looked at what households actually do, using the Survey of Consumer Finances, and found allocations that depart substantially from that prescription. Location is a decision most people never make explicitly; assets end up wherever the money happened to arrive.

The size of the gain is genuinely uncertain now. The original work was calibrated when bond yields were high and the drag from holding them in taxable was correspondingly large. A decade of near-zero yields made the whole question smaller, and higher yields have made it matter again — which is a good illustration of why an effect size should be quoted with its conditions attached.

The rules of thumb, in rough order: put high-yield bonds, REITs and anything with high turnoverTurnoverHow much of a fund's portfolio it buys and sells in a year. High turnover means trading costs the expense ratio does not show, and in a taxable account it means realised gains you did not choose to take. inside the tax-advantagedTax-advantaged accountAn account whose growth is sheltered from annual taxation — a 401(k), an IRA, an HSA. The shelter is the product; the investments inside it can be identical to the ones in a taxable account.Read the evidence on this → accounts; keep broad equity index funds in taxable, where their gains defer and their qualified dividends are taxed lightly; and hold any RothRothAn account funded with money you have already paid tax on, where qualified withdrawals are then untaxed. The mirror image of a traditional account: you pay today's rate instead of the rate you will face in retirement.Read the evidence on this → space for the highest-expected-return assets, because the tax you avoid there is the tax on growth. All of these are second-order compared with contributing more and paying less in fees.