
Tax Loss Harvesting
- 1 installs
- 34k repo stars
- Updated August 4, 2026
- anthropics/financial-services
Tax-loss-harvesting is a Claude skill that identifies loss-harvesting opportunities across taxable accounts, suggests replacements, and tracks wash sale windows.
About
Tax-loss-harvesting scans taxable accounts for positions with unrealized losses and estimates the tax savings from harvesting them. It suggests replacement securities that maintain exposure without triggering wash sales and tracks the 30-day wash sale window across all household accounts. An advisor uses it for year-end tax planning and ongoing loss harvesting.
- Finds positions with unrealized losses across taxable accounts
- Suggests non-substantially-identical replacement securities
- Tracks 30-day wash sale windows across the household
Tax Loss Harvesting by the numbers
- 1 all-time installs (skills.sh)
- Ranked #909 of 1,106 Finance & Trading skills by installs in the Skillselion catalog
- Data as of Aug 5, 2026 (Skillselion catalog sync)
tax-loss-harvesting capabilities & compatibility
- Capabilities
- portfolio rebalance · portfolio monitoring
- Use cases
- data analysis
What tax-loss-harvesting says it does
Identify tax-loss harvesting opportunities across taxable accounts.
Wash sale rules are strict — violations disallow the loss AND adjust cost basis
Up to $3,000 net loss deduction against ordinary income
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| Installs | 1 |
|---|---|
| repo stars | ★ 34k |
| Last updated | August 4, 2026 |
| Repository | anthropics/financial-services ↗ |
What it does
Identify tax-loss harvesting opportunities and replacement securities while tracking wash sale windows.
Who is it for?
Advisors harvesting losses and planning year-end taxes across taxable accounts
Skip if: Tax filing or legal tax advice
When should I use this skill?
Harvesting losses, year-end tax planning, or reviewing unrealized losses
What you get
A harvest list, replacement securities, wash sale tracking calendar, and tax-savings estimate
- harvest opportunity list (Excel)
- trade execution sheet
- wash sale tracking calendar
By the numbers
- 7-step workflow
- 30-day wash sale lookback/forward window
- $3,000 net loss deduction cap
Files
Tax-Loss Harvesting
Workflow
Step 1: Identify Candidates
Scan taxable accounts for positions with unrealized losses:
| Security | Asset Class | Cost Basis | Current Value | Unrealized Loss | Holding Period | % Loss |
|---|---|---|---|---|---|---|
| ST / LT |
Prioritize by: 1. Largest absolute loss (biggest tax benefit) 2. Short-term losses first (offset short-term gains taxed at ordinary income rates) 3. Positions with the largest % loss (less likely to recover quickly)
Step 2: Gain/Loss Budget
Calculate the client's tax situation:
| Category | Amount |
|---|---|
| Realized short-term gains YTD | |
| Realized long-term gains YTD | |
| Realized losses YTD | |
| Net gain/(loss) position | |
| Carryforward losses from prior years | |
| Target harvesting amount |
Tax savings estimate:
- Short-term losses × marginal ordinary income rate
- Long-term losses × capital gains rate
- Up to $3,000 net loss deduction against ordinary income
- Excess carries forward
Step 3: Replacement Securities
For each harvest candidate, suggest a replacement that:
- Maintains similar market exposure (same asset class, sector, geography)
- Is NOT "substantially identical" (wash sale rule)
- Has similar risk/return characteristics
| Sell | Replace With | Reason | Tracking Error Risk |
|---|---|---|---|
| SPDR S&P 500 (SPY) | iShares Core S&P 500 (IVV) | Same index, different fund family | Minimal |
| Vanguard Total Intl (VXUS) | iShares MSCI ACWI ex-US (ACWX) | Similar exposure, different index | Low |
| Individual stock ABC | Sector ETF (XLK) | Broader exposure, no wash sale risk | Moderate |
Step 4: Wash Sale Check
Before executing, verify no wash sales:
- Check ALL accounts in the household (taxable, IRA, Roth, spouse accounts)
- 30-day lookback: Did we buy substantially identical securities in the last 30 days?
- 30-day forward: Block repurchase of the same security for 30 days
- Check for dividend reinvestment plans (DRIPs) that could trigger wash sales
- Document the wash sale window for each trade
| Security Sold | Wash Sale Window Start | Window End | DRIP Active? | Risk |
|---|---|---|---|---|
Step 5: Execution Plan
| Trade # | Account | Action | Security | Shares | Est. Proceeds | Est. Loss | Replacement | Notes |
|---|---|---|---|---|---|---|---|---|
| Sell | ||||||||
| Buy |
Summary:
- Total estimated losses harvested: $
- Estimated tax savings: $ (at marginal rate of %)
- Net portfolio impact: minimal (replacement securities maintain exposure)
- Wash sale window management: [dates]
Step 6: Post-Harvest Tracking
After 30+ days, optionally:
- Swap back to original securities (if preferred)
- Maintain replacement securities (if no reason to switch back)
- Update cost basis records
- Document for tax reporting
Step 7: Output
- Harvest opportunity list (Excel)
- Trade execution sheet
- Wash sale tracking calendar
- Tax savings estimate summary
- Replacement security rationale
Important Notes
- Wash sale rules are strict — violations disallow the loss AND adjust cost basis
- Substantially identical means same security, not same asset class — ETFs tracking different indexes are generally fine
- Always coordinate across all household accounts including retirement accounts
- Consider the long-term cost basis step-down — harvesting resets cost basis, which means more gains later
- Year-end is prime harvesting season but opportunities exist throughout the year
- Mutual fund capital gains distributions in December can create additional harvesting urgency
- Document everything for tax reporting and compliance
- Not all losses are worth harvesting — transaction costs and tracking error have real costs
Related skills
FAQ
How does it avoid wash sales?
It suggests replacements that are not substantially identical and checks the 30-day window across all household accounts including retirement and spouse accounts.
How much loss offsets ordinary income?
Up to $3,000 net loss deducts against ordinary income, with the excess carried forward.