Tax-Loss Harvesting & Wash-Sale Optimizer
Calculate tax alpha savings, short/long-term capital gains offsets, $3,000 ordinary income write-offs, and 30-year reinvestment compounding.
1. Capital Losses & Gains (Schedule D)
Current Tax Year2. Income & Tax Filing Status
Marginal Rates3. Reinvestment Compounding Horizon
8.0% S&P 500 CAGR$3,750.00
$6,000
@ 30.0% Fed+State$4,000
@ 21.0% LTCG+State$3,000
IRS § 1211(b) Max$2,000
Future Tax YearsAssuming 8.0% annual CAGR compounding without tax drag
Compounded Wealth Trajectory of Harvested Tax Savings
Reinvested in S&P 500 (8.0% CAGR)IRS 30-Day Wash-Sale Rule: Safe Proxy ETF Substitution Matrix
To claim the tax loss without triggering IRS § 1091 disallowance, swap into a non-"substantially identical" correlated asset to maintain market exposure.
| Sold Asset (Harvest Loss) | Underlying Index | Safe Replacement Proxy | Replacement Index | Wash-Sale Status |
|---|---|---|---|---|
| VOO / SPY / IVV | S&P 500 Index | VTI / SCHB / ITOT | Total US Stock Market (CRSP / Dow Jones) | 100% Safe (Different Index) |
| QQQ | Nasdaq-100 Index | VGT / XLK / IYW | MSCI US Tech / S&P Technology Select | 100% Safe (Sector Focus) |
| VXUS | FTSE Global All Cap ex US | IXUS / VEU | MSCI ACWI ex USA / FTSE All-World | 100% Safe (Different Index) |
| VNQ | MSCI US REIT Index | SCHH / XLRE | Dow Jones US Select REIT / Real Estate Select | 100% Safe (Different Index) |
| Individual Stock (e.g. NVDA) | Single Company Equity | SMH / SOXX / AMD | VanEck Semiconductor ETF / Competitor | 100% Safe (Basket / Competitor) |
Click "Run AI Tax Alpha Audit" to evaluate optimal year-end harvest timing, analyze your 3.8% Net Investment Income Tax (NIIT) exposure, and construct safe ETF proxy rotation pairs. 100% private to you—zero server access.
Zero Data Access: Financial amounts and income parameters execute 100% locally on your device. Zero Server Access
The Tax Alpha Formula: How Systematic Tax-Loss Harvesting Adds 1.2% in Annual Compounded Returns
A comprehensive quantitative analysis of IRS Schedule D netting, 30-day wash sale navigation, and dividend reinvestment traps.
What is Tax Alpha?
In quantitative finance, "Tax Alpha" is the excess return generated solely through intelligent tax management rather than picking winning stocks. By selling losing positions before December 31, investors eliminate taxes on winning trades and capture up to a $3,000 deduction against ordinary paycheck income. Reinvesting that saved tax money compounds continuously, creating an extra $15,000 to $100,000+ in terminal wealth over 20 to 30 years.
Case Study #1: Harvesting $15,000 in NVDA Losses to Offset Short-Term Gains and W-2 Income
Consider an investor in California earning $185,000 (24% Federal Marginal Bracket + 9.3% State Tax = 33.3% Combined Rate). During the year, they realized $6,000 in Short-Term Crypto/Stock Gains and $4,000 in Long-Term Stock Gains.
Wipes out short-term tax bill completely
Wipes out 15% LTCG + 9.3% CA tax
Direct cash deduction on Form 1040
→ Total Immediate Tax Refund: $3,969 in cash! PLUS $2,000 in remaining loss carries forward into next year.
Case Study #2: The Hidden DRIP (Dividend Reinvestment) Wash Sale Trap
A common mistake occurs when an investor sells 100 shares of Apple (AAPL) for a $2,000 loss on December 15. However, on December 20, AAPL pays a quarterly dividend, and their brokerage account has Automatic Dividend Reinvestment (DRIP) enabled, automatically purchasing 0.8 shares of AAPL.
Because those 0.8 shares were purchased within the 30-day window, the IRS classifies that portion as a Wash Sale. To prevent this, disable automatic dividend reinvestment across all taxable accounts prior to executing tax-loss harvesting sales.
Frequently Asked Questions (Tax-Loss Harvesting & Wash Sales)
How does Tax-Loss Harvesting (TLH) reduce my taxes?
Tax-loss harvesting involves selling investments at an unrealized loss to offset realized capital gains dollar-for-dollar on IRS Schedule D. If your losses exceed total capital gains, you can deduct up to $3,000 ($1,500 if married filing separately) against ordinary W-2 or business income, with any remaining balance carrying forward indefinitely to future tax years.
What is the IRS 30-Day Wash Sale Rule?
Under IRS Section 1091, a wash sale occurs if you sell a security at a loss and purchase a "substantially identical" security within a 61-day window (30 days before the sale, the day of the sale, or 30 days after the sale). When triggered, the loss deduction is disallowed and added to the cost basis of the newly acquired security.
What are safe ETF proxy pairs for tax-loss harvesting without triggering a wash sale?
Investors frequently swap between ETFs tracking different underlying indices. For example, selling Vanguard S&P 500 (VOO, tracking S&P 500) and immediately purchasing Vanguard Total Stock Market (VTI, tracking CRSP US Total Market) or Schwab US Large-Cap (SCHX, tracking Dow Jones US Large-Cap) maintains market exposure while avoiding IRS wash sale disallowance.
What happens if a wash sale occurs in a Roth IRA?
Under IRS Revenue Ruling 2008-5, if you sell a stock at a loss in a taxable brokerage account and repurchase the same stock within 30 days in an IRA or Roth IRA, the tax loss is permanently eliminated and cannot be added to the IRA basis, resulting in a total loss of the tax deduction.