ETF Tax Efficiency Scorer

Purpose

Not all index funds are created equal from a tax perspective. Two funds tracking the same index can have dramatically different tax costs in a taxable account. This skill scores and compares funds on tax efficiency so investors can make informed choices about which funds belong in taxable accounts vs. tax-advantaged accounts.

The difference matters: a tax-inefficient fund in a taxable account can cost 0.5-1.5% per year in unnecessary taxes compared to a tax-efficient alternative providing identical market exposure.

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Tax Efficiency Scoring Framework

Score Components (0-100 scale)

Each fund gets a composite tax efficiency score based on these factors:

1. Structure Score (0-25 points)

ETF:                    25 points (in-kind creation/redemption avoids cap gains)
Index Mutual Fund:      15 points (less efficient redemption mechanism)
Active Mutual Fund:      5 points (frequent trading generates distributions)
Closed-End Fund:        10 points (no redemptions but may trade at discount)

Why: ETFs have a structural advantage — authorized participants can redeem shares "in-kind" (exchanging ETF shares for the underlying stocks), which purges low-basis shares without triggering taxable events for remaining holders.

2. Turnover Score (0-20 points)

Turnover < 5%:          20 points
Turnover 5-15%:         15 points
Turnover 15-30%:        10 points
Turnover 30-50%:         5 points
Turnover > 50%:          0 points

Why: Every time a fund sells a holding at a gain, it must distribute that gain to shareholders. Lower turnover = fewer forced taxable events.

3. Distribution History Score (0-25 points)

No capital gains distributed (3yr):     25 points
Minimal CG distributions (<0.5%/yr):    20 points
Small CG distributions (0.5-2%/yr):     10 points
Significant CG distributions (>2%/yr):   0 points

Why: Past distributions are the best predictor of future distributions. Check the fund's actual distribution history, not just its strategy.

4. Dividend Tax Treatment Score (0-15 points)

No/minimal dividends (growth stocks):       15 points
Mostly qualified dividends (US equities):    12 points
Mix of qualified/non-qualified:               8 points
Mostly non-qualified (bonds, REITs, intl):    3 points
All ordinary income (bond funds):             0 points

Why: Qualified dividends are taxed at LTCG rates (0/15/20%), while non-qualified dividends and bond interest are taxed at ordinary income rates (up to 37% + state).

5. Dividend Yield Impact (0-15 points)

Yield < 0.5%:     15 points
Yield 0.5-1.5%:   12 points
Yield 1.5-2.5%:    8 points
Yield 2.5-4%:      4 points
Yield > 4%:        0 points

Why: Higher yields mean more annual taxable income, regardless of qualification status. Growth-oriented funds that retain earnings are more tax-efficient in taxable accounts.

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Common Fund Comparisons

When users ask for ETF comparisons, here are reference scores for popular categories:

US Broad Market (Most Tax-Efficient Category)

Fund	Type	Expense	Yield	Turnover	Tax Score	Notes
VTI	ETF	0.03%	~1.3%	4%	90+	Gold standard
ITOT	ETF	0.03%	~1.3%	4%	90+	iShares equivalent
SCHB	ETF	0.03%	~1.3%	4%	90+	Schwab equivalent
SPTM	ETF	0.03%	~1.3%	4%	90+	SPDR equivalent
VTSAX	MF	0.04%	~1.3%	4%	80	Mutual fund version

S&P 500

Fund	Type	Expense	Yield	Turnover	Tax Score	Notes
VOO	ETF	0.03%	~1.3%	2%	92+	Lowest turnover
IVV	ETF	0.03%	~1.3%	2%	92+	iShares equivalent
SPY	ETF	0.09%	~1.3%	2%	88	Unit trust structure, less efficient
SPLG	ETF	0.02%	~1.3%	2%	92+	Cheapest

Growth (Very Tax-Efficient)

Fund	Type	Expense	Yield	Turnover	Tax Score	Notes
VUG	ETF	0.04%	~0.5%	5%	92+	Low yield = low annual tax
QQQ	ETF	0.20%	~0.6%	8%	88	Higher expense, Nasdaq 100
SCHG	ETF	0.04%	~0.4%	5%	93+	Very low yield
IWF	ETF	0.19%	~0.6%	15%	82	Higher turnover

International (Less Tax-Efficient)

Fund	Type	Expense	Yield	Turnover	Tax Score	Notes
VXUS	ETF	0.07%	~3.0%	4%	65	High yield, foreign tax drag
IXUS	ETF	0.07%	~2.8%	4%	67	Similar to VXUS
EFA	ETF	0.32%	~2.8%	5%	58	Higher expense

Bonds (Least Tax-Efficient)

Fund	Type	Expense	Yield	Turnover	Tax Score	Notes
BND	ETF	0.03%	~3.5%	40%	25	All ordinary income
AGG	ETF	0.03%	~3.5%	40%	25	Similar to BND
MUB	ETF	0.07%	~2.5%	10%	75	Federal tax-exempt!
VTEB	ETF	0.05%	~2.5%	10%	78	Federal tax-exempt
CMF	ETF	0.07%	~2.0%	10%	85	CA state + fed exempt

REITs (Tax-Inefficient)

Fund	Type	Expense	Yield	Turnover	Tax Score	Notes
VNQ	ETF	0.12%	~3.8%	6%	20	Most dividends = ordinary income
SCHH	ETF	0.07%	~3.5%	5%	22	Slightly better

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Asset Location Recommendations

Based on tax efficiency scores, recommend where each fund type belongs:

Taxable Account (Best for tax-efficient funds)

BEST FIT:
- US total market ETFs (VTI, ITOT, SCHB)
- S&P 500 ETFs (VOO, IVV, SPLG)
- US growth ETFs (VUG, SCHG, QQQ)
- Municipal bond ETFs (MUB, VTEB, state-specific like CMF)
- Tax-managed funds (VTCLX, VTMFX)

REASON: These generate minimal taxable events; munis are tax-exempt

Tax-Advantaged Account — IRA/401(k) (Best for tax-inefficient funds)

BEST FIT:
- Bond funds (BND, AGG, BNDX)
- REIT funds (VNQ, SCHH)
- High-dividend value funds (VTV, VYM)
- International funds (VXUS, IXUS) — though foreign tax credit argument exists
- Actively managed funds with high turnover
- TIPS funds (VTIP, SCHP)

REASON: Dividends and interest compound tax-free; no annual tax drag

Special Case: International Funds

International funds have a nuance:
- In TAXABLE: You get a foreign tax credit for taxes withheld by foreign governments
- In IRA/401(k): Foreign taxes are withheld but you get NO credit (lost forever)
- RECOMMENDATION: If portfolio is large enough to claim FTC, hold international in taxable
  Otherwise, the high dividend yield argues for tax-advantaged

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Output Format

Single Fund Analysis

[TICKER] — [Fund Name]
━━━━━━━━━━━━━━━━━━━━━━━
Tax Efficiency Score: XX/100

Structure:          XX/25  [ETF/MF/Active]
Turnover:           XX/20  [X% annual]
Distribution Hx:    XX/25  [CG distributions past 3yr]
Dividend Quality:   XX/15  [% qualified]
Dividend Yield:     XX/15  [X.X% yield]

Recommended Account: [Taxable / Tax-Advantaged / Either]
Annual Tax Cost Estimate: ~$XXX per $10,000 invested
  (at [Federal Rate]% + [State Rate]% marginal rates)

Comparison Table

COMPARISON: Taxable Account Tax Impact

                    [FUND A]    [FUND B]    [FUND C]
Tax Score:          XX/100      XX/100      XX/100
Expense Ratio:      X.XX%       X.XX%       X.XX%
Dividend Yield:     X.X%        X.X%        X.X%
Qualified %:        XX%         XX%         XX%
Turnover:           XX%         XX%         XX%
Recent CG Dist:     $X.XX       $X.XX       $X.XX

Est. Annual Tax/$10K:
  Federal:          $XXX        $XXX        $XXX
  State ([ST]):     $XXX        $XXX        $XXX
  Total:            $XXX        $XXX        $XXX

RECOMMENDATION: [Fund X] is the most tax-efficient choice for a taxable account,
saving approximately $XXX/year per $10,000 vs [Fund Y].

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Data Sources

When analyzing specific funds, use available knowledge about:

• Expense ratios
• Historical dividend yields
• Turnover rates
• Capital gains distribution history
• Fund structure (ETF vs mutual fund vs unit trust)
• Qualifying dividend percentages

If the user needs real-time data, suggest checking:

• Morningstar (tax cost ratio)
• Fund provider websites (distribution history)
• ETF.com (fund comparison tools)

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Important Notes

• Tax efficiency scores are estimates based on fund characteristics and historical behavior
• Past distribution history doesn't guarantee future distributions
• A fund's tax efficiency is just one factor — expense ratios, tracking error, and total return also matter
• The "best" fund depends on which account it goes in; a tax-inefficient fund in an IRA has zero tax drag
• Municipal bond yields should be compared on a tax-equivalent basis: Tax-Equiv Yield = Muni Yield / (1 - Marginal Tax Rate)

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Reference Data

Read references/tax-rates-2025.md for current tax rates to calculate annual tax cost estimates.