Wash Sale Rule Complete Guide: The 61-Day Trap Across All Accounts

Tax-loss harvesting is worthless if the IRS disallows the loss. The wash sale rule is the trap, and it spans all your accounts — including your spouse's and your IRA.

The Rule

If you sell a security at a loss and buy a "substantially identical" security within 30 days before or 30 days after the sale (a 61-day window), the loss is disallowed in the current year.

The disallowed loss is not gone — it is added to the basis of the replacement shares and recovered when those shares are sold. The holding period of the original also carries over.

What Counts as "Substantially Identical"

• Same company stock in two accounts → identical.
• Different companies in the same sector → not identical (e.g., sell JPM, buy BAC).
• An ETF and another ETF tracking a different index → generally not identical.
• Two ETFs tracking the same index (e.g., SPY and IVV) → treat as high-risk; many practitioners say avoid the pairing.
• Stock and options on that stock → identical at exercise; call options bought within the window can trigger the rule.

The IRA Trap (Permanent Loss)

Under Revenue Ruling 2008-5, if you sell a stock at a loss in your taxable account and buy it back in your IRA within the 61-day window, the loss is disallowed and not added to any basis — it disappears forever. This is the most expensive version of the rule.

Cross-Account Tracking

Brokers only flag wash sales within their own platform. Losses triggered by a repurchase at a different broker, or by an automatic dividend reinvestment in an IRA, will not show on your 1099-B but are still your responsibility to report correctly.

Practical Example

• Jan 1: Buy 100 XYZ at $80.
• Mar 1: Sell at $50 → $3,000 loss.
• Mar 10: Buy 100 XYZ at $52 (inside window).
• Result: $3,000 loss disallowed now; new basis = $52 + $3,000 = $3,052 per the lot adjusted (i.e., $5,200 + $3,000 = $8,200 total).

Safe Harvesting Substitutes

Instead of repurchasing the same security:

• Swap to a similar-but-not-identical fund (VTI → ITOT, or SPY → VOO is risky; better XLK → FTEC).
• Wait 31 days before repurchasing.
• Buy the replacement first, wait 31 days, then sell the loser (double up).

Action Points

1. Turn off automatic dividend reinvestment in taxable accounts during November–December.
2. Keep a single spreadsheet of every loss sale and its 31-day safe zone.
3. Coordinate across spouses — the IRS applies the rule per taxpayer, but spouses are treated as one taxpayer for this purpose.
4. Never harvest a loss into an IRA.