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Tax-Loss Harvesting: A Practical Guide for 2026
Learn how to use investment losses to reduce your tax bill, avoid wash sale violations, and automate harvesting with portfolio tracking tools.
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Learn how to use investment losses to reduce your tax bill, avoid wash sale violations, and automate harvesting with portfolio tracking tools.
This guide is designed for first-pass understanding. Start with core terms, then apply the framework in your own account workflow.
Tax-loss harvesting is one of the few legal ways to reduce your tax bill by selling investments at a loss to offset capital gains. Done right, it can save you thousands per year. Done wrong, the IRS will disallow your deductions; or worse, you'll trigger wash sale violations without realizing it.
When you sell an investment for less than you paid, you realize a capital loss. That loss can offset capital gains from other investments, reducing your taxable income. If your losses exceed your gains, you can deduct up to $3,000 per year against ordinary income and carry forward the rest indefinitely.
The tax rate you're offsetting matters. Short-term capital gains (assets held under one year) are taxed at your ordinary income rate; up to 37% for high earners. Long-term capital gains (held over one year) are taxed at 0%, 15%, or 20% depending on income. Harvesting losses against short-term gains saves you more per dollar than harvesting against long-term gains.
You sold NVDA earlier this year for a $10,000 short-term gain. You also hold a stock that's down $6,000 from your purchase price. If you sell the loser before year-end:
The IRS has a catch: the wash sale rule. If you sell a security at a loss and buy a "substantially identical" security within 30 days before or after the sale, the loss is disallowed. The disallowed loss gets added to the cost basis of the replacement security; it's not lost forever, but it can't be used now.
The IRS has never precisely defined this term, which creates a gray area. Here's what's generally understood:
When in doubt, consult a tax professional. The penalty for getting a wash sale wrong is losing the deduction entirely for that tax year.
Tax-loss harvesting is a strategy where you sell investments at a loss to offset capital gains from other investments, reducing your overall tax bill. If losses exceed gains, you can deduct up to $3,000 per year against ordinary income.
Yes. As of 2025, crypto is subject to the wash sale rule. You must wait 30 days before repurchasing the same cryptocurrency after selling it at a loss, or the loss will be disallowed by the IRS.
While year-end is traditional, opportunities exist throughout the year — especially after market downturns. A sudden correction creates harvesting opportunities that may disappear if the market recovers by December.
FIFO (First In, First Out) sells your oldest shares first. Specific identification lets you choose which lots to sell, potentially maximizing losses by selecting the highest-cost lots. Specific identification can save significantly more in taxes.
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Apply this concept with live balances, transactions, and portfolio data instead of static spreadsheets.
Graph: 6 outgoing / 13 incoming
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Semantic Transaction Search: Find Transactions by Meaning, Not Just Keywords
Clarity uses sentence-transformers (all-MiniLM-L6-v2) embeddings and cosine similarity to let you search transactions with natural language — find 'that expensive dinner in December' or 'subscription I forgot about' without knowing the exact merchant name.
Starting in 2025, cryptocurrency is subject to the wash sale rule under provisions in the IRS digital asset reporting framework. Previously, crypto was classified as property (not a security), which meant the wash sale rule didn't apply; you could sell Bitcoin at a loss and immediately rebuy. That loophole is now closed.
The 30-day rule now applies to crypto the same way it applies to stocks. If you sell ETH at a loss, you need to wait 30 days before repurchasing ETH. You can, however, buy a different cryptocurrency during the waiting period.
To find harvesting opportunities, you need to track the cost basis of every lot you hold. This means knowing exactly what you paid for each purchase; not just the average price.
The IRS allows several cost basis methods. FIFO (First In, First Out) is the default; your oldest shares are sold first. But specific identification lets you choose which lots to sell, targeting the ones with the largest losses. The difference can be significant:
A $3,000 swing in tax impact; from the same holding, at the same price.
Year-end is the traditional time (you need to settle trades by December 31), but opportunities exist throughout the year; especially after market downturns. Some investors check quarterly. The key is having real-time visibility into your unrealized gains and losses across all accounts, not just one brokerage.
After significant market corrections (like early 2020 or late 2022), harvesting opportunities are everywhere. Investors who had portfolio-wide visibility were able to harvest far more aggressively than those checking accounts one at a time.
Tax-loss harvesting isn't a free lunch. It makes less sense when:
Tracking cost basis, wash sales, and harvesting opportunities across multiple brokerages — including Fidelity, Schwab, and others — and crypto exchanges is genuinely hard to do manually. Clarity automates the painful parts:
Tax-loss harvesting involves individual tax circumstances. This guide is educational — not tax advice. Consult a CPA or tax advisor for decisions specific to your situation.