Crypto tax-loss harvesting is one of the most powerful and underutilised tax strategies available to cryptocurrency investors. Used correctly, it can legally reduce your tax bill by thousands of dollars every year. In this guide, we explain exactly how crypto tax-loss harvesting works and how to implement it effectively.
What Is Tax-Loss Harvesting?
Tax-loss harvesting is the practice of selling cryptocurrency that has declined in value to realise a loss — which can then be used to offset capital gains elsewhere in your portfolio, reducing your overall tax liability.
For example, if you made $10,000 in gains from selling Bitcoin but lost $4,000 on an altcoin position, you can sell the altcoin to realise the $4,000 loss and offset it against your $10,000 gain — reducing your taxable gain to just $6,000.
Why Crypto Is Ideal for Tax-Loss Harvesting
Cryptocurrency is particularly well-suited to tax-loss harvesting for one important reason: unlike stocks, crypto is not subject to the wash-sale rule in the USA.
The wash-sale rule prevents stock investors from selling a security at a loss and immediately repurchasing the same security within 30 days — if they do, the loss is disallowed for tax purposes.
Because the IRS classifies crypto as property rather than a security, this rule does not currently apply. This means you can sell Bitcoin at a loss, immediately repurchase it, and still claim the tax loss — maintaining your market position while reducing your tax bill.
Note: Tax laws change frequently. Always verify the current wash-sale rules with a tax professional before implementing this strategy.
How Tax-Loss Harvesting Works Step by Step
Step 1: Review your portfolio and identify positions currently showing unrealised losses.
Step 2: Calculate how much in capital gains you have realised during the year that need offsetting.
Step 3: Sell the loss positions to realise the losses before the end of the tax year (December 31 in the USA).
Step 4: If desired, immediately repurchase the same assets to maintain your market exposure.
Step 5: Report the losses on Form 8949 and use them to offset your gains on Schedule D.
Capital Loss Limits and Carryforwards
In the USA, if your total capital losses exceed your total capital gains in a given year, you can use up to $3,000 of the excess loss to offset ordinary income. Any remaining losses can be carried forward to future tax years indefinitely.
This means tax-loss harvesting is valuable even in years when you have no capital gains — the losses are never wasted.
When to Harvest Losses
The best time to harvest losses is before the end of the tax year — typically November and December. However, tax-loss harvesting can be valuable at any time of year, particularly during significant market downturns when many positions may be showing losses.
Do not let tax considerations drive poor investment decisions. Only harvest losses on positions you are genuinely willing to sell — even temporarily.
Tax-Loss Harvesting in the UK, Canada, and Australia
The wash-sale equivalent rules vary by country:
UK — HMRC has a 30-day rule similar to the wash-sale rule. If you sell crypto at a loss and repurchase the same asset within 30 days, the loss is matched against the repurchase and cannot be used to offset other gains.
Canada — the CRA has superficial loss rules that apply to identical properties, including cryptocurrency. Selling at a loss and repurchasing within 30 days may disallow the loss.
Australia — the ATO does not have a specific wash-sale rule for crypto, but the general anti-avoidance provisions may apply in aggressive cases.
Using Software to Identify Harvesting Opportunities
Manually identifying tax-loss harvesting opportunities across a large portfolio is time-consuming. Platforms like Koinly and TaxBit offer tax-loss harvesting tools that automatically identify positions with unrealised losses and calculate the potential tax saving from harvesting them.
Key Takeaways
- Tax-loss harvesting involves selling losing positions to offset capital gains and reduce tax
- Crypto is not subject to the wash-sale rule in the USA — you can immediately repurchase
- Up to $3,000 in excess losses can offset ordinary income annually in the USA
- Unused losses carry forward indefinitely to future tax years
- Harvest losses before December 31 to maximise the current year tax benefit
- UK and Canada have wash-sale equivalent rules — check local rules before harvesting
- Use crypto tax software to automatically identify harvesting opportunities