# wash-sale-detection

Scans your trade history for wash sales under 2025 US crypto rules, totals disallowed losses and counts down to a safe re-entry.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 426 installs · ★ 443
- Author: agipro
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/agiprolabs/claude-trading-skills/tree/HEAD/skills/wash-sale-detection/SKILL.md
- Updated: 2026-09-03
- HTML: https://affpapa.org/en/nevibecode/skills/wash-sale-detection

## What it does

The skill reads your trade history and flags every wash sale under the US rules for digital assets that took effect in 2025. The window is 61 calendar days: 30 before a loss sale and 30 after. Buy the same token inside it and the loss is disallowed, then folded into the cost basis of the replacement position.

Under the hood is a Python script, `scripts/wash_sale_scanner.py`, with a `WashSaleScanner` class. Feed it trades with date, action, token, qty and price; it returns the wash sales it found, adjusted basis figures and a countdown of days until re-entry is safe. No external dependencies, Python 3.10+ is enough. Trades spread across exchanges and wallets have to be merged into one list first, because the rule follows the taxpayer rather than the account.

The scanner also targets automation. DCA bots, grid bots and copy-trading systems buy and sell the same token over and over, so wash sales show up there often. The author states plainly that this is not tax advice and points you to a CPA. One caveat: the source text cuts off inside the safe re-entry strategy section, so that part is not covered in full here.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add agiprolabs/claude-trading-skills --skill wash-sale-detection -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/wash-sale-detection/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/wash-sale-detection/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add agiprolabs/claude-trading-skills --skill wash-sale-detection -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/wash-sale-detection/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add agiprolabs/claude-trading-skills --skill wash-sale-detection -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/wash-sale-detection/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install agiprolabs/claude-trading-skills wash-sale-detection
```

2. **Manually: put the files in place**
- File: `.github/skills/wash-sale-detection/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add agiprolabs/claude-trading-skills --skill wash-sale-detection -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/agiprolabs/claude-trading-skills --path skills/wash-sale-detection
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/wash-sale-detection/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add agiprolabs/claude-trading-skills --skill wash-sale-detection -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/agiprolabs/claude-trading-skills/tree/HEAD/skills/wash-sale-detection/SKILL.md

## When to use it
- flag every wash sale across a full year of trading before filing
- compute the exact disallowed loss per sale
- find out how many days remain before re-entering a token safely
- audit a copy-trading bot export for wash sales it triggered
- merge trades from several exchanges and wallets into one scan

## Example prompts
- scan my SOL trade history for wash sales in 2025
- how many days until I can safely re-enter this token after a loss sale
- run wash-sale-detection on my DCA bot trade export

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 17598189f0cfe4ca.

BEGIN THIRD-PARTY FILE 17598189f0cfe4ca
````text
---
name: wash-sale-detection
description: Wash sale detection under 2025 US crypto rules with 61-day window monitoring, disallowed loss tracking, and safe re-entry countdown
license: MIT
metadata:
  author: agipro
  version: "0.1.0"
  category: trading
---

# Wash Sale Detection

Detect wash sales under current US crypto tax rules (effective 2025), monitor the 61-day window around realized losses, track disallowed losses with basis adjustments, and compute safe re-entry countdowns.

> **Disclaimer**: This skill provides informational analysis only. It is NOT tax advice. Consult a qualified tax professional or CPA for guidance on your specific situation. Tax law is complex, and the application of wash sale rules to cryptocurrency may vary based on individual circumstances, IRS guidance updates, and court rulings.

## Background

Before 2025, cryptocurrency was not subject to the wash sale rule because digital assets were classified as property rather than securities. The **Infrastructure Investment and Jobs Act** and subsequent IRS rulemaking extended wash sale treatment to digital assets beginning January 1, 2025.

Under **IRC Section 1091** (as amended for digital assets), if you sell or dispose of a cryptocurrency at a loss and acquire a **substantially identical** asset within a **61-day window** (30 days before the sale through 30 days after), the loss is **disallowed** for tax purposes. The disallowed loss is added to the cost basis of the replacement position.

## Key Concepts

### The 61-Day Window

```
Day -30 ................. Day 0 ................. Day +30
  |--- 30 days before ---|--- sale day ---|--- 30 days after ---|
  ^                       ^                                      ^
  Window opens        Loss realized                    Window closes
```

- **Day 0**: The day you sell a position at a realized loss
- **Days -30 to -1**: Purchases in this range trigger a wash sale retroactively
- **Days +1 to +30**: Purchases in this range trigger a wash sale prospectively
- The window is **calendar days**, not trading days

### Substantially Identical Assets

For crypto, "substantially identical" generally means the **same token**. Selling SOL at a loss and buying SOL within 30 days is a wash sale. Selling SOL and buying ETH is not (they are different assets).

Edge cases that may be scrutinized:
- Wrapped vs unwrapped versions of the same token (e.g., SOL vs wSOL)
````
END THIRD-PARTY FILE 17598189f0cfe4ca

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First 2422 of 9111 bytes. © agipro · MIT · https://github.com/agiprolabs/claude-trading-skills/tree/HEAD/skills/wash-sale-detection/SKILL.md

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