Two investors can hold the exact same portfolio and end up with very different after-tax outcomes over 20 years. The difference is not what they own. It is which account holds what.
Learning how to structure investment accounts for tax efficiency one of the few decisions in investing that is fully in your control and where the long-term impact compounds visibly. The numbers can be modeled. The mistakes are correctable.
This guide is for the household that already has the brokerage account, the 401(k), maybe the Roth, maybe an HSA, and wants to know whether the assets are sitting in the right places.
The Three Buckets Your Money Can Sit In
Every dollar you invest ends up in one of three tax categories. Taxable. Tax-deferred. Tax-free. The rules are different for each, and the matchup between asset and account matters more than most people realize.
Taxable accounts are your brokerage accounts. Dividends, interest, and capital gains all get taxed in the year they show up. You have full flexibility on contributions and withdrawals.
Tax-deferred accounts (Traditional IRA, 401(k), SEP-IRA) shelter income from tax today, then tax it as ordinary income when you withdraw. For 2026, the 401(k) employee deferral limit is $24,500, with a $7,500 catch-up at age 50 and an additional super catch-up of $11,250 at ages 60 to 63, per the IRS 2026 inflation adjustments.
Tax-free accounts (Roth IRA, Roth 401(k), HSA) get no upfront deduction but grow and distribute tax-free under current rules. The Roth IRA direct contribution phaseout for 2026 sits at $150,000 to $165,000 modified AGI for single filers and $236,000 to $246,000 for married filing jointly, which puts direct contributions out of reach for most HNW households (the backdoor is still on the table).
The mix of accounts you have access to, not just the total dollars, defines what is possible.
What Is Asset Location and Why Does It Matter?
The technical term is asset location. The practical version: put the tax-inefficient stuff inside tax-advantaged accounts. Put the tax-efficient stuff in taxable.
Research from Vanguard and Morningstar estimates that thoughtful asset location can add 0.5% to 1% in annual after-tax return over multi-decade horizons. The portfolio does not change. The risk does not change. The expected return does not change. Only the after-tax outcome changes.
Why does this work?
Bonds and high-turnover funds throw off ordinary income and short-term gains, both of which compound poorly inside a taxable account. Equity index funds and broad-market ETFs throw off mostly qualified dividends and long-term gains, both of which are taxed more gently. The wrapper around the asset matters as much as the asset itself.
Which Assets Belong in Which Accounts?
A working framework, not a hard rule. Bonds, REITs, actively managed funds with high turnover, and TIPS belong inside tax-deferred accounts where their ordinary-income distributions are sheltered.
Broad equity index funds, ETFs, individual stocks you plan to hold for years, and municipal bonds belong in taxable brokerage accounts. Long-term capital gains and qualified dividends are some of the gentler tax treatments in the code; do not waste them inside a Traditional IRA, where they would convert into ordinary income on the way out.
Roth accounts deserve their own conversation. They grow tax-free and have no required minimum distributions during your lifetime. That makes them the right home for your highest-expected-return assets, the ones with the most room to compound. Small-cap equities. Emerging markets. Anything you expect to outperform broad indexes over decades. The thing that compounds the hardest gets the best tax wrapper.
Tax-Loss Harvesting and Where It Goes Wrong
Tax-loss harvesting works only inside taxable accounts. Realized losses can offset realized gains and up to $3,000 of ordinary income per year, with anything beyond that carrying forward indefinitely.
Direct indexing has changed the math here. Historical harvest yields (the dollars of harvestable losses generated per year) have run roughly 1% to 2% of portfolio value annually in normal markets. Past performance does not guarantee future results, and harvest yields vary widely by market environment.
The trap is the wash-sale rule. If you sell something at a loss and buy a substantially identical security within 30 days, the loss is disallowed. The rule applies across every account in the household, including your spouse’s IRA. Most harvesting errors we see come from accounts that were not coordinated, not from the strategy itself.
The HSA Is the Best Account Most People Underuse
The Health Savings Account is the only account in the U.S. tax code with triple tax efficiency. Deductible contributions. Tax-free growth. Tax-free withdrawals for qualified medical expenses. There is nothing else like it.
For 2026, the HSA contribution limit is $4,400 for self-only coverage and $8,750 for family coverage, with an additional $1,000 catch-up at age 55 and over, per IRS Rev. Proc. 2025-19. The HDHP minimum deductible is $1,700 self-only / $3,400 family, with a maximum out-of-pocket of $8,500 self-only / $17,000 family.
For a household with the cash flow to pay current medical expenses out of pocket and invest the HSA balance instead, the HSA effectively becomes a supplemental retirement account with better tax treatment than either a Traditional or Roth IRA. Most people use it as a checking account for current bills. That works, but it leaves the highest-leverage tax wrapper in the code on the table.
When Do Roth Conversions Make Sense for HNW Households?
Roth conversions move money from a Traditional IRA into a Roth IRA. You pay ordinary income tax on the conversion now in exchange for tax-free growth and withdrawals later.
The math depends on your current vs. expected future tax brackets, your projected RMD income, your state of residence, and what you plan to leave behind. The conversion is irrevocable under current law (the recharacterization option was removed by the 2017 Tax Cuts and Jobs Act), so most households model the multi-year impact before pulling the trigger.
The window that often matters most: the gap between retirement and the start of RMDs at age 73. For households with significant pretax balances and a few low-income years available, converting steadily through that window can meaningfully reduce lifetime taxes on the same dollar.
For South Carolina residents, the absence of state tax on Social Security and the retirement income deduction for residents 65 and older shifts the math compared to higher-tax states. Coordinating conversions with SC tax timing is a recurring conversation for Midlands households we work with.
The Account Structure Mistakes We See Most Often
The same four mistakes show up across the HNW households we work with.
First, holding the same allocation in every account rather than coordinating across them. The accounts can hold different things, and that is the entire point. Putting bonds in the brokerage account and equities in the IRA undoes everything tax efficiency is trying to do.
Second, leaving high-turnover active funds in taxable accounts. Their tax efficiency is poor by design. They belong inside a tax-deferred wrapper.
Third, missing Roth conversion windows in low-income years. The years before age 73, before Social Security begins, or right after a high-earning career ends are often the cleanest windows for converting. Most households never model them.
Fourth, over-contributing to tax-deferred accounts when projected RMD income will already push the household into the top brackets. Some HNW households should be funding Roth accounts instead, even at a higher current tax rate, because the future bracket is worse than today’s.
Each of these quietly costs 0.25% to 1% per year in after-tax return. On a $5 million portfolio over 20 years, that drag compounds to wealth that did not have to be lost.
Where Account Structure Fits in the Broader Plan
Tax-efficient account structure is one piece of a broader plan that includes investment allocation, withdrawal sequencing, charitable strategy, and estate timing. The households that get the structure right early compound the benefit across decades. The households that wait to pay for it in tax drag they rarely see it itemized.
If your current accounts have not been reviewed against your projected income trajectory, contribution capacity, and RMD picture, that review is worth doing now rather than later.
We work with HNW families across Chapin, Columbia, Lexington, Lake Murray, and the broader Midlands.
Schedule a conversation with the Keen Capital team, and we will map out where the structure is working and where it isn’t.
This content is for informational and educational purposes only and does not constitute investment, tax, or legal advice. Past performance does not guarantee future results. Investing involves risk, including possible loss of principal. Tax rules change and individual circumstances vary. Consult with qualified financial, tax, and legal advisors before making decisions. Keen Capital is a registered investment advisor.
Common Questions
Frequently asked questions on this topic.
What is asset location and why does it matter for HNW investors?
Asset location is the practice of placing investments in the account type that best matches their tax treatment. Income-generating assets like REITs and high-yield bonds belong in tax-deferred accounts, where their distributions are not taxed annually. Tax-efficient broad index ETFs work well in taxable accounts. Roth accounts hold the highest-expected-return assets because future gains escape tax entirely. For HNW households, getting asset location right can add roughly 0.50% of annual after-tax return without changing the underlying portfolio, per Vanguard’s research on advisor value-add.
Which assets belong in tax-deferred accounts versus Roth versus taxable?
Tax-deferred accounts such as Traditional IRAs and 401(k)s hold ordinary-income-generating assets: investment-grade and high-yield bonds, REITs, and credit strategies. Roth accounts hold the highest-expected-return assets, including small-cap and emerging markets equity, because future appreciation is never taxed. Taxable accounts hold broad-market index ETFs, municipal bonds where appropriate for your bracket, and individual stocks held long enough to qualify for long-term capital gains rates.
Why is the HSA the most underused tax-advantaged account for HNW households?
The HSA is the only account that gets a triple tax benefit: contributions are pre-tax, growth is untaxed, and qualified medical withdrawals are tax-free. The 2026 IRS family HSA contribution limit is $8,750, plus a $1,000 catch-up for those 55 or older. HNW households often skip the HSA because the contribution looks small relative to their income, but a fully-invested HSA growing for 20 years can fund six-figure retirement healthcare costs entirely tax-free.
When do Roth conversions make sense for HNW households?
Roth conversions move dollars from a tax-deferred account to a Roth account, paying income tax now in exchange for tax-free growth and withdrawals later. The best window is usually after the wage-earning years end and before required minimum distributions begin at age 73, typically ages 60 through 72. Conversions make sense when your current marginal bracket is lower than your expected bracket at RMD age, when you want to reduce the tax bill your heirs will inherit, or when you want to fill up lower brackets in a low-income year such as a sabbatical or early retirement.
What account structure mistakes do HNW investors make most often?
Three patterns recur. First, putting bonds inside a Roth IRA, which wastes the Roth’s tax-free growth on a low-expected-return asset. Second, holding REITs in a taxable account, where every distribution is taxed as ordinary income. Third, treating 529 plans as a federal deduction. They are not federally deductible, but many states offer meaningful state-level deductions for using their own plan, which often makes the in-state 529 the right choice even if the out-of-state plan has lower fees.
About the Keen Capital Team
This article was prepared by the Keen Capital team in Chapin, SC. Keen Capital is a fee-only fiduciary wealth advisory firm registered with the SEC (CRD 145023), serving high-net-worth families across Chapin, Columbia, Lake Murray, Lexington, and the broader Midlands. Our team includes CFP®, CFA, CPA, and EA credentials. Meet the team.
This content is for educational and informational purposes only and does not constitute investment advice. Past performance does not guarantee future results. Investing involves risk, including possible loss of principal.
