You’ve got a taxable brokerage account, a rollover IRA from an old employer, and a 401(k) with your current company. Three accounts, three tax treatments, and one question every time the market drifts: do you rebalance each account on its own, or treat the whole household as a single portfolio?
The short answer is that you should be looking at the household as one portfolio, not three separate ones. But there’s real nuance in how you get there, and it’s a question that comes up constantly with clients who’ve accumulated accounts across different employers and account types over a career.
Asset Allocation and Asset Location Are Different Decisions
Asset allocation is the easy part to picture: maybe you’re targeting seventy percent equities and thirty percent bonds across everything you own. Asset location is the more granular decision layered on top of that: given the tax treatment of each account, where should each asset class actually live? You could simply mirror the seventy-thirty split inside every single account, and that’s a completely reasonable, low-complexity approach. Getting more granular than that is where the potential benefit, and the potential mistakes, start to show up.
Where Bonds and Growth Assets Actually Belong
Bonds generate coupon payments that are taxed as ordinary income every year, so they tend to work better sitting inside tax-deferred accounts like a traditional IRA or 401(k), where that income isn’t triggering a tax bill annually. Taxable brokerage accounts are generally a better home for assets that don’t throw off much taxable income along the way, things oriented toward growth rather than yield. Roth accounts, since they’re never taxed again, are often the best place for your highest expected growth assets. None of this changes your aggregate allocation. It’s simply about being deliberate regarding which account holds which piece of it.
The Alpha Is Real, But It’s Small
Research suggests a well-executed tax location strategy can add somewhere in the range of five to thirty basis points of return annually. That’s a real, legitimate benefit, and it’s essentially free once it’s set up correctly. It’s also not enormous, which matters for how much complexity is worth introducing to capture it.
Don’t Let a Small Optimization Wreck Your Real Target
Here’s the risk that concerns me more than people realize. If you’re chasing that thirty basis points of tax alpha and you’re not careful with the calculations, it’s easy to drift your aggregate allocation without noticing. You might be targeting a seventy-thirty portfolio and, because bonds are concentrated in one account and growth assets in another, accidentally end up sitting at eighty-five percent equities and fifteen percent fixed income across the household. That’s a meaningfully different risk profile than the one you intended, all in pursuit of a return boost measured in fractions of a percent. If you’re doing this yourself without a system for checking the aggregate numbers regularly, the simpler approach of mirroring your target allocation in every account may genuinely serve you better.
Watch for Wash Sale Traps Between Accounts
There’s a second pitfall that trips people up: household accounts don’t operate in isolation, even when you’re trying to optimize each one. Say you harvest five thousand dollars in losses inside your taxable brokerage account, a legitimate and useful move. If you’ve also got automatic dividend reinvestment turned on on a similar holding inside your IRA, a small reinvested dividend in that retirement account can trigger the wash sale rule and disallow the loss you were counting on in your taxable account. Rebalancing and tax loss harvesting have to be coordinated across every account in the household, not executed account by account without a view of the whole picture.
Coordinate the Household, or Keep It Simple
Tax location and cross-account tax loss harvesting can genuinely add value, but only with real oversight. If you have a team that’s tracking the aggregate allocation and watching for wash sale conflicts across accounts, it’s worth pursuing. If you’re managing this alone and don’t have a reliable process for checking the whole household picture regularly, there’s nothing wrong with keeping every account allocated identically and accepting a slightly lower theoretical return in exchange for a portfolio that’s much harder to get wrong. Feel free to run your setup by us, your advisors, before you decide which path makes more sense for you.
This post is adapted from a recent episode of the Scholar Wealth Podcast. For more perspective on rebalancing across account types, listen to the full podcast episode here.