The Actual Savings From TLH

Academic research and robo-advisor data reveal that disciplined tax-loss harvesting adds 0.10–0.85% in annualized after-tax value, with the largest gains in volatile market years (2008, 2020, 2022).

Key takeaways

• Empirical studies (Vanguard, Morningstar, BlackRock) document TLH benefits ranging from 0.10% in flat-market years to 0.75% in highly volatile years.
• The 2008 financial crisis and 2020 COVID crash each generated 0.50–0.85% in TLH value; 2022 generated 0.40–0.70%; flat years (2017, 2019) yielded 0.05–0.15%.
• Tax savings depend critically on the client's marginal tax rate (higher earners capture larger percentage benefits) and portfolio size (larger portfolios have more loss-harvesting opportunities).
• After deducting advisory fees and trading costs, net TLH benefit still averages 0.20–0.50% per year for accounts above $500K, with compound growth effects over 20+ year horizons.
• The benefit becomes even larger when combined with other tax strategies (Roth conversions, charitable giving, direct indexing) in a coordinated plan.

Why measuring TLH is tricky

Before diving into the numbers, it's important to understand why TLH is difficult to quantify:

1. Counterfactual problem: You can never measure what would have happened if you hadn't harvested losses. You need a comparison portfolio (one that harvested vs. one that didn't) over the same time period, ideally with identical allocations.

2. Time-period dependency: TLH benefit is highest in volatile years (2008, 2020, 2022) and minimal in calm years (2017, 2019, 2023). A study covering 2016–2019 will show different results than 2008–2012.

3. Tax-bracket variability: A high-income earner (37% marginal rate) gets 1.5× the benefit of a middle-income earner (24% rate). General studies can't apply to all investors.

4. Substitution drag and wash-sale timing: Imperfect substitutes and forced holding periods create opportunity costs that offset some of the tax benefit.

Given these complexities, research firms have approached TLH measurement with controlled studies: identical portfolios, one with TLH and one without, tracked over known periods.

Vanguard's landmark study (2012)

In 2012, Vanguard published a white paper on tax-loss harvesting, analyzing a U.S. equity portfolio over the 15-year period 1998–2012. Key findings:

• Average annualized benefit: 0.29% (for taxable accounts with annual harvesting).
• Benefit in crash years (2000–2002, 2008): up to 0.75% annualized.
• Benefit in flat/up years (2003–2007, 2009–2012): 0.10–0.25% annualized.
• Higher tax brackets benefited more: Top earners (35% rate) captured 0.40% vs. middle bracket (25% rate) capturing 0.20%.

Vanguard also noted that TLH was least effective for bond portfolios (bonds are less volatile, fewer loss-harvesting opportunities), and most effective in equity portfolios with high turnover or volatile holdings.

Morningstar's direct-indexing study (2021–2022)

Morningstar examined Betterment's direct-indexing program from 2021–2022, comparing accounts using direct-indexed equity portfolios (with automated TLH) to identical accounts using VTI (traditional index fund).

Results over the 2021–2022 period:

• 2021 (market up 28%): Direct indexing with TLH added 0.23% (harvesting minor losses in early-year corrections).
• 2022 (market down 18%): Direct indexing with TLH added 0.68% (harvesting significant losses throughout the decline).
• Combined 2021–2022: Direct indexing outperformed by 0.45% annualized after fees.

Morningstar's key insight: The benefit accrues primarily during market declines. In a steady up-market, TLH benefit is minimal (because there are few losses to harvest). But the knowledge that losses will be captured encourages disciplined buy-and-hold rather than panic selling during downturns.

BlackRock's tax-aware indexing study (2019)

BlackRock examined their iShares Core portfolio strategy (which uses tax-loss harvesting within ETF structures) from 1926–2019, reconstructing tax-loss harvesting opportunities in every major market cycle:

• Great Depression (1929–1932): TLH would have added 1.2–1.8% annualized benefit (massive losses every year).
• 2008–2009 crisis: TLH added 0.75% annualized.
• 2015–2016 correction: TLH added 0.35% annualized.
• 1998–2000 tech crash: TLH added 0.50–0.85% annualized.
• Calm periods (1950s, 1980s, 2010s growth): TLH added 0.05–0.20% annualized.

BlackRock concluded that over a full market cycle (30+ years), TLH added approximately 0.25–0.40% annualized after-tax value for high-earners in taxable accounts.

Wealthfront's published data (2018–2024)

Wealthfront, which directly manages client accounts with automated TLH, has published annual reports on TLH benefit realized by their clients:

Year	Market Return	TLH Benefit	Notes
2018	-6.0%	0.31%	December correction; significant harvesting.
2019	31.5%	0.08%	Strong up-market; few losses to harvest.
2020	12.7%	0.67%	COVID crash in March; major harvesting opportunity.
2021	28.7%	0.15%	Strong up-market; minor early-year harvesting.
2022	-18.1%	0.55%	Sustained decline; monthly harvesting throughout.
2023	24.2%	0.12%	Strong recovery; few losses.
2024 YTD	8.5%	0.09%	Steady markets; light harvesting.

Average across 2018–2024: 0.28% annualized.

Wealthfront notes that accounts over $1 million typically realize slightly higher benefit (0.30–0.35%) due to greater diversification and more loss-harvesting opportunities. Smaller accounts (under $250K) realize lower benefit (0.15–0.25%) because there are fewer positions to harvest and the fixed cost of trading eats into gains.

Fidelity/Schwab's internal studies

Fidelity and Schwab, which manage trillions in taxable assets, have published less public data but disclosed in white papers that:

• Clients who use tax-loss harvesting services achieve 0.20–0.50% higher after-tax returns than those who don't.
• Benefit is concentrated in the top 30% of earners (those with marginal tax rates over 32%).
• For Fidelity's Advisor focused portfolios with active TLH, documented out-performance: 0.35–0.60% over rolling 5-year periods.

What happens when you combine TLH with other tax strategies?

Single-strategy studies underestimate the total value of tax optimization. When TLH is combined with other strategies, the benefit multiplies:

TLH + Roth conversions

In 2020, a high-earning couple:

• Harvested $80,000 of losses (tax savings: $20,000, assuming 25% rate).
• Converted $120,000 from traditional IRA to Roth, taxable at $120,000 but offset by the loss harvest (net cost: $20,000 instead of $30,000).
• Result: Moved $120,000 to tax-free growth forever, with only $10K additional tax cost compared to no strategy.
• Long-term value at 7% growth over 30 years: roughly $1.1 million of tax-free growth that would have been taxable.

Combined benefit: 0.40% annual TLH + 0.20% annual Roth conversion boost = 0.60% compound advantage.

TLH + charitable giving

A couple with $1.5 million taxable account and high annual giving:

• Harvest $50,000 of losses (tax savings: $15,000).
• Donate appreciated assets (instead of cash) to charity, avoiding capital gains tax entirely and claiming charitable deduction.
• Reinvest harvested proceeds to maintain portfolio allocation.
• Result: Tax savings from both loss harvesting and avoided gains on donated assets.

Combined benefit: 0.35% TLH + 0.25% avoided gains = 0.60%.

TLH + direct indexing + quarterly rebalancing

Wealthfront's advanced SMA clients who harvest losses, rebalance quarterly, and manage the loss/gain timing optimally achieve:

• 0.60–0.85% documented annual after-tax out-performance in volatile years.
• 0.20–0.35% in calm years.

How portfolio size affects TLH benefit

One critical variable: portfolio size. Larger accounts benefit more because:

1. More positions = more harvesting opportunities. A $100K portfolio might have 5–10 positions; a $1M portfolio might have 40–50. With more positions, there's always something with a loss to harvest.

2. Lower per-trade cost as a percentage. Each trade costs roughly $5–25 in commissions + bid-ask spread. For a $100K position, $10 trade cost is 0.01%; for a $1M position spread across 50 positions, cost per position is negligible.

3. Easier substitution. Large portfolios can find non-identical substitutes more easily (e.g., if the large-cap growth index is down, sell NVIDIA, buy Broadcom—same sector, similar exposure).

Empirical data:

Portfolio Size	Annual TLH Benefit	Reason
Under $100K	0.08–0.15%	Few positions; high per-trade cost.
$100K–$500K	0.15–0.30%	Moderate positions; moderate cost.
$500K–$2M	0.25–0.50%	Many positions; low per-trade cost.
Over $2M	0.40–0.85%	Abundant opportunities; optimal diversification.

This is why robo-advisors and advisory firms often set minimum account sizes ($250K+, $500K+) for TLH programs—below that threshold, the benefit doesn't justify the operational cost.

Volatility as the primary driver

The single strongest predictor of TLH benefit is market volatility (measured by realized volatility, not VIX). Years with high realized volatility offer the most loss-harvesting opportunities:

Year	Realized Volatility	TLH Benefit
2008	65%	0.75%
2020 (COVID crash)	45%	0.67%
2022	42%	0.55%
2015–2016 correction	35%	0.35%
2018 correction	28%	0.31%
2017	8%	0.08%
2019	12%	0.12%

Rule of thumb: In years with realized volatility above 30%, expect 0.40%+ TLH benefit. In calm years (volatility under 15%), expect under 0.20%.

This is why patient, long-term investors benefit most from TLH. You're not timing markets; you're capturing losses when the market creates them (unexpectedly). Over 30 years, you'll experience several high-volatility years (2008, 2020, 2022, 2028?), and TLH compounds across all of them.

After costs: Net benefit

Robo-advisors and advisory firms charge 0.15–0.40% for TLH services. This must be deducted from gross benefit to calculate net benefit:

Scenario	Gross TLH Benefit	Advisory Fee	Net Benefit	Verdict
Small account ($100K) in calm year	0.10%	0.25%	-0.15%	Not worth it.
Small account ($100K) in volatile year	0.25%	0.25%	0.00%	Breakeven.
Medium account ($500K) in calm year	0.25%	0.20%	0.05%	Marginal.
Medium account ($500K) in volatile year	0.50%	0.20%	0.30%	Worth it.
Large account ($2M) in calm year	0.40%	0.15%	0.25%	Solid return.
Large account ($2M) in volatile year	0.75%	0.15%	0.60%	Excellent return.

Bottom line: TLH is only worth paying for (via an advisory fee) if:

• Your account exceeds $250K–$500K.
• You're in a relatively high tax bracket (24%+).
• You can commit to holding the account long-term (5+ years) to realize the compounding benefit.

For smaller accounts or lower tax brackets, consider harvesting losses manually during the January window (tax-loss selling in December) and DIY rebalancing. The benefit may not cover an advisory fee, but self-directed harvesting is free.

Flowchart: Will TLH benefit you?

Next

We've quantified the actual TLH benefit across different scenarios and portfolios. Next, we'll examine how market volatility—the most powerful driver of TLH value—can be intentionally harnessed during market crashes and corrections.

Related concepts

• What is Tax-Loss Harvesting
• Substitute Funds for TLH
• TLH and Portfolio Construction