Continuous Tax-Loss Harvesting
Capture portfolio losses while preserving exposure and avoiding wash sales
- Difficulty
- Moderate
- Time to result
- ~ongoing to results
- Steps
- 6
- Confidence
- 97%
Continuous tax-loss harvesting replaces the traditional December-only review with regular monitoring of taxable holdings. When volatility pushes a suitable position below its tax basis, the investor sells it to realize the loss and purchases a similar, but not substantially identical, security to retain the portfolio's intended exposure. The harvested loss can offset capital gains and potentially support future tax planning, subject to applicable rules. Execution must account for wash sales across relevant accounts, trading costs, portfolio drift, and state-specific treatment. The process may be automated through direct indexing, but it can also be applied manually to conventional portfolios. Year-end review remains useful for reconciling accumulated losses with gains that may need to be realized.
Origin
Extracted from Masters in Business, where Bill Artsmarnian contrasted historical December harvesting with an ongoing approach enabled by diversified portfolios and direct indexing.
Core principles
- 01Harvest throughout the year rather than only in December
- 02Preserve the portfolio's intended exposure
- 03Avoid wash-sale violations
- 04Coordinate losses with realized gains and state rules
How to run it
- 1
Set a review cadence
Monitor taxable positions throughout the year and after meaningful market volatility rather than waiting for December.
Pro tip Use alerts or portfolio software to identify positions below their tax basis.
Watch out Reviewing too frequently can encourage trades with negligible benefits.
- 2
Quantify the usable loss
Estimate the loss available and determine whether current gains, future gains, or other permitted offsets make it valuable.
Pro tip Include existing carryforwards in the calculation.
Watch out A realized loss may have limited immediate value in jurisdictions that restrict carryforwards.
- 3
Select the sale
Choose losing positions whose sale will not materially damage the investment strategy.
Pro tip Prioritize opportunities with meaningful after-tax value.
Watch out Do not let tax considerations override suitability or risk controls.
- 4
Choose a replacement
Purchase a similar but non-identical investment that maintains the desired economic exposure.
Pro tip Compare sector, factor, and benchmark characteristics before trading.
Watch out Buying a substantially identical security can trigger the wash-sale rule.
- 5
Check every account
Review purchases in the investor's other relevant accounts for transactions that could create a wash sale.
Pro tip Coordinate household and automated reinvestment activity.
Watch out Dividend reinvestment or an IRA purchase can unintentionally undermine the harvest.
- 6
Reconcile at year end
Compare realized losses with gains and state-specific rules, then decide whether gains should also be harvested.
Pro tip For states without loss carryforwards, consider using losses before year end.
Watch out Federal and state optimization may require different actions.
In the wild
A diversified portfolio contains a company trading below its tax basis. The investor sells it, records the capital loss, and buys a similar company that maintains the portfolio's intended exposure without being substantially identical.
→ The investor creates a tax loss while preserving the portfolio's broad economic characteristics.
A New Jersey investor has accumulated realized losses during the first eleven months. Because the state does not allow those losses to carry forward, the year-end review identifies appreciated positions whose gains can use the losses during the current year.
→ Current state losses offset current gains instead of expiring unused.
Common mistakes
Waiting until December
Loss opportunities can disappear before the annual review, particularly in volatile markets.
Breaking portfolio fidelity
Selling without a suitable replacement can leave the investor with unintended exposure or excessive cash.
Ignoring state rules
Federal carryforward treatment does not necessarily apply at the state level, changing the optimal year-end trade.
Is it for you?
Best for
Investors with diversified taxable portfolios, realized gains, and enough volatility to produce harvestable losses.
Not ideal for
Investors whose assets are held entirely in tax-advantaged accounts or whose transaction and tracking burdens exceed the likely benefit.
From the transcript
“there should be an ongoing activity, not just a year end item.”
“so you sell those, you pick up tax losses, you invest in a similar company, so you keep the fidelity of the portfolio, and then…”
“We're going to realize capital gains so we can use them at the state level this year.”
From the episode
Year-End Tax Planning Moves