How to Evaluate a Tax-Managed SMA Before You Commit Capital

The pitch for a tax-managed separately managed account is a good one. 

Own individual securities instead of fund shares, harvest losses systematically, and keep more of what you earn after tax.

The pitch is also often true, in the right circumstances. The harder question is whether a particular account, from a particular manager, at a particular fee, will deliver that for you. That deserves a structured answer before you move money, not after.

If separately managed accounts are new to you, start with our explainer on what an SMA is and how it can help you save on taxes. 

What follows is the due diligence layer on how to evaluate a tax-managed SMA: what to ask, and what the answers tell you.

The Fees You Can See Are Not the Whole Cost

The management fee is disclosed. Several other costs are not, and they are often larger.

Most tax-managed SMA managers charge somewhere between 0.25% and 0.55% a year on top of your advisory fee, varying by platform and account size. On a $500,000 account, that extra layer runs roughly $1,250 to $2,750 a year before the strategy has produced anything.

Fees also tend to be tiered, and the number quoted to you is usually the rate at the lowest breakpoint. A $500,000 account and a $2 million account at the same manager can pay quite different rates. Custodian charges and your advisor’s own fee sit on top. Stacked together, the all-in cost of a tax-managed SMA commonly lands between 0.70% and 1.50% a year.

Some platforms bill separately for tax reporting, transition analysis, or custom restriction screens, which are the rules that let you exclude a particular company, often your own employer’s stock. Others bundle them. 

Implicit costs that occur are add another level of unseen expense. Is the SMA investing in a highly liquid market with low bid-ask spreads and good execution cost? Are there costs to trade foreign ADRs and is that considered when deciding whether a loss should be harvested? Get the all-in number that considers all variables in writing before the account is funded, not after.

Focus on Process to Get Results

Comparing a tax-managed SMA to an index on a pre-tax basis tells you almost nothing, because the tax treatment is the entire point of the product.

What matters is the after-tax figure, calculated at the rate you actually pay. For most high-net-worth investors, that means the 20% federal long-term rate plus the 3.8% net investment income tax, which applies to investment income above $200,000 for single filers and $250,000 for married couples filing jointly, per the IRS.  South Carolina adds a modest amount on top, softened by the state’s 44% deduction on long-term gains.

Focus on the process, rather than getting sold on performance numbers. A manager that can articulate their process, costs, and considerations is a step in the right direction. Don’t fall for a sales pitch with cherry-picked timeframes that make returns appear outsized.

Bear in mind that results here depend heavily on market conditions. Loss harvesting needs volatility to work, so a calm, steadily rising market produces fewer opportunities and a smaller benefit. This is another reason past performance is not a good indicator of how well the process will work in the future.

How Much Capital Does This Actually Need?

Platform minimums usually start around $250,000, but the minimum and the breakeven are not the same number.

Below roughly $250,000, the fixed costs of running a portfolio of individual stocks plus the percentage-based fee tend to consume much of the tax benefit before it can compound. The clearest advantage shows up above $500,000 in taxable assets.

Look at how the portfolio will be structured for the account size you have. Larger portfolios tend to hold more securities and be more diversified. More positions means more chances to harvest a loss without losing focus on the integrity of the account structure. Ask what the portfolio will look like at your account size specifically, rather than accepting the flagship example.

What Should You Ask About Turnover and Wash Sales?

These two questions separate well-run platforms from careless ones faster than anything else on the list.

High turnover can create short-term capital gains, which are taxed as ordinary income at rates up to 37% federally rather than the 20% long-term rate. An account that harvests losses enthusiastically while generating short-term gains through constant rebalancing can end up worse after tax than a low-turnover index fund. Ask for the average turnover rate and the ratio of short-term to long-term realized gains over the past three to five years.

On wash sales, ask what the manager buys as a replacement when harvesting a loss, how long they hold it, and whether they monitor across all of your accounts or only the one they manage. That last point matters more than it sounds. If your IRA buys the same security your SMA just sold at a loss, the loss is disallowed, and cross-account breaches are easy to miss and expensive when they happen.

Transition Cost Is Usually the Largest Hidden Variable

Most evaluations focus on how the strategy performs going forward. The bigger number is often what it costs to get in.

If you are moving appreciated positions from an existing taxable account, the manager either takes those securities in kind and works around the embedded gains, or sells them and you absorb the tax now. For a low-basis, concentrated portfolio, that entry tax can wipe out several years of expected benefit before the strategy has done anything.

Taking securities in kind defers that bill, but it constrains how the portfolio can be built initially, which usually means looser tracking against the index at the start.

Ask for a transition analysis based on your actual holdings: the estimated tax cost, how long it takes to earn back through tax savings, and what constraints the transferred positions place on the portfolio. If the payback runs beyond about five years, the move may not make sense, however good the ongoing strategy looks. Eventually, most portfolios reach ossification…

The Dreaded Ossification Problem

SMA “ossification” refers to the tendency of a separately managed account to become increasingly concentrated and difficult to reposition over time as successful holdings accumulate large embedded capital gains. That tax lock-in can reduce the manager’s flexibility and may eventually make it very difficult and expensive to rebalance.

Consider the following circumstances that warrant SMA consideration: 

• Will my capital gains tax rate be lower in the future when I am more likely to have taxable gains? 
• Do I plan to withdraw from these funds, or are they intended to be passed onto the next generation with a step-up in cost basis?
• Am I charitably inclined? If so, you can cherry-pick highly appreciated securities to give to a donor-advised fund or charity, thus avoiding capital gains while getting additional tax deductions (subject to tax limitations).
• Do I have a non-investment reason to avoid less customized funds? For example, clients choosing SMAs often want to restrict certain sectors or companies that do not fit with their overall investment needs.

If none of these circumstances apply, you might not need a costly SMA. Highly tax-efficient ETFs (not run as straight index funds) can offer similar after-tax returns without the added cost.  Oftentimes, portfolios made up of a combination of ETF and SMA portfolios perform well over time.

The Questions to Put in Writing

Every item below should get a written answer from any manager worth hiring.

If several come back vague, that is your answer.

• The all-in fee structure, including the manager fee, your advisor’s fee, custodian charges, and anything billed separately.
• What the portfolio holds at your specific account size, including the number of securities and expected tracking error.
• Average turnover, and the ratio of short-term to long-term realized gains over three to five years.
• A transition analysis on your actual holdings, with the estimated tax cost and the payback period.
• Whether wash-sale monitoring covers all of your household accounts or only the SMA.

Where This Lands

A tax-managed SMA can be a genuinely useful part of a taxable portfolio when the account is large enough, the transition cost is manageable, and ossification has been considered.

It is a poor fit when the account is small, when the entry tax bill is steep, or when most of your gains are long-term and infrequent. In those cases, a tax-efficient fund often gets you close to the same place for a fraction of the cost and complexity.

If you are weighing a specific proposal, we are happy to go through the fee modeling, the transition math, and the after-tax comparison against what you already hold. That analysis sits inside our broader tax planning and wealth management work and our approach to high-net-worth investment strategies.

You can book an introductory call here.

Until next time.