A candidate, Maria, saw her client's portfolio had a $15,000 unrealized loss in an S&P 500 mutual fund. To offset a gain, she sold it. To maintain market exposure, she immediately bought an S&P 500 ETF from a different fund family. Maria felt confident she'd avoided the wash sale rule. On the exam, a similar question came up, but the "substantially identical" security was a different share class of the same mutual fund. She got it wrong. That single distinction is where points are won or lost.
Tax-loss harvesting is a strategy to sell an investment at a loss to offset capital gains taxes on other investments. On the CFP exam, you must apply the capital loss netting rules and the wash sale rule (IRC § 1091), which disallows a loss if a "substantially identical" security is purchased within 30 days before or after the sale.
Key facts
- Exam Section: Investment Planning (Principal Knowledge Topic 5)
- Section Weighting: 17% of the total CFP® exam
- Ordinary Income Offset: Up to $3,000 in net capital losses can be deducted against ordinary income per year.
- Wash Sale Window: 61 days (30 days before the sale, the day of the sale, and 30 days after).
- Loss Carryforward: Net capital losses exceeding the $3,000 limit can be carried forward indefinitely.
- Official Body: Certified Financial Planner Board of Standards, Inc. (CFP Board).
The CFP Board reports a historical pass rate between 60-65% for the CFP® exam, underscoring the need for strategic preparation on nuanced topics like this (CFP Board).
What is Tax-Loss Harvesting and Why It Matters for the CFP Exam
Tax-loss harvesting is the practice of selling a security that has experienced a loss to realize that loss for tax purposes. This allows an investor to offset capital gains that have been realized from selling other securities at a profit. It's a core component of tax-efficient portfolio management and a concept the CFP Board expects you to understand cold.
Studying for CFP CFP5? Benchmark your score in 5 minutes.
Get an instant weak-spot assessment and a custom 12-week study plan PDF generated for your exam window.
On the exam, this isn't just a definition you recall. It's a tool you apply. Questions will present a client's portfolio with a mix of realized gains and unrealized losses and ask you to determine the most tax-efficient course of action. They test your ability to navigate the complex rules that govern this strategy. The Investment Planning section makes up a significant 17% of the exam, and tax-loss harvesting is a frequently tested application within it. Try VoraPrep's free CFP practice questions to see how these concepts are framed.
The most common mistake candidates make is a superficial understanding of the wash sale rule. They memorize the "30-day" rule but fail to grasp the nuance of what constitutes a "substantially identical" security. The exam will exploit this by presenting securities that seem different but are treated as identical by the IRS, or vice-versa. Another critical error is misapplying the capital loss netting rules, which dictate the specific order in which short-term and long-term gains and losses must be offset.
Key Concepts and Rules You Must Know
To handle any tax-loss harvesting question, you need to master three specific areas: the wash sale rule, the capital loss netting hierarchy, and the rules for deducting and carrying forward losses. This isn't about rote memorization; it's about building a mental flowchart for how to process the information in a question stem.
The Wash Sale Rule (IRC § 1091)
The wash sale rule is the examiner's favorite trap. It states that if you sell a security at a loss, you cannot deduct that loss for tax purposes if you buy a "substantially identical" security within 30 days before or after the sale (a 61-day window).
- What is "Substantially Identical"? The IRS doesn't provide a perfect definition, which is what makes it a great exam topic.
- Clearly Identical: Stock in the same company (e.g., selling AAPL and buying AAPL). Different share classes of the same company (e.g., GOOG vs. GOOGL) are often considered substantially identical.
- Clearly Not Identical: Selling an ETF that tracks the S&P 500 (like SPY) and buying an ETF that tracks a total stock market index (like VTI). Even selling one S&P 500 ETF (SPY) and buying another (IVV) is generally accepted as not identical because they are issued by different firms and may have minor tracking differences.
- The Consequence: If the rule is triggered, the loss is disallowed for the current year. Instead, the disallowed loss is added to the cost basis of the new, replacement security. This defers the tax benefit, it doesn't eliminate it forever.
Capital Loss Netting Hierarchy
If you have multiple gains and losses, you can't just mix and match them. The IRS requires a specific netting process.
| Step | Action | Example |
|---|---|---|
| 1 | Net Short-Term | Offset short-term capital gains (STCG) with short-term capital losses (STCL). |
| 2 | Net Long-Term | Offset long-term capital gains (LTCG) with long-term capital losses (LTCL). |
| 3 | Net the Results | If one category has a gain and the other has a loss, net them against each other. |
This order is non-negotiable.
The $3,000 Ordinary Income Deduction and Carryforwards
After all netting is complete, if you have a net capital loss for the year, you can use it to offset other types of income.
- The Limit: You can deduct up to $3,000 of net capital loss against your ordinary income (like your salary) each year.
- The Carryforward: If your net capital loss is greater than $3,000, the excess amount is carried forward to future tax years. This carryforward amount retains its character as either short-term or long-term. There is no expiration date on this carryforward.
This is a critical point. A client with a $50,000 net capital loss doesn't lose the benefit. They deduct $3,000 this year and carry the remaining $47,000 forward to offset future gains or, if none, $3,000 of ordinary income per year until it's used up.
Worked Example with Step-by-Step Solution
Let's apply this. Exam questions are rarely straightforward; they weave in details to see if you can filter the noise and apply the correct framework.
> 💡 Worked example: > Your client, David, age 50, is in the 32% federal income tax bracket. In November 2026, he reviews his taxable brokerage account and notes the following: > - Realized Gain: Sold shares of TechCorp Inc. for a $20,000 short-term capital gain. > - Unrealized Loss: Holds 500 shares of EnergyFund (an ETF), currently valued at $50/share ($25,000 total). His cost basis is $80/share ($40,000 total), representing an unrealized loss of $15,000. > - Client Goal: David wants to reduce his tax bill for 2026 but wants to remain invested in the energy sector. He suggests selling EnergyFund and immediately buying a different energy sector ETF, GigaEnergy ETF. > > What is the tax impact of this strategy, and what is David's basis in the new GigaEnergy ETF shares if he reinvests the full $25,000 proceeds?
This question combines the netting rules and the wash sale concept.
Step 1: Identify the Taxable Event
First, identify the gain that needs to be offset. David has a realized $20,000 STCG. Without any action, this gain would be taxed at his ordinary income rate of 32%, resulting in a $6,400 tax liability.
Step 2: Analyze the Proposed Loss Harvest
David proposes selling EnergyFund to realize the $15,000 loss.
- Proceeds: 500 shares * $50/share = $25,000
- Cost Basis: 500 shares * $80/share = $40,000
- Realized Loss: $25,000 - $40,000 = ($15,000)
Since this holding was likely held for more than a year (the problem doesn't specify, but we'll assume it's LT for complexity, a common exam tactic), this is a long-term capital loss (LTCL).
Step 3: Apply the Netting Rules
Now, we net the realized gain and the harvested loss according to the hierarchy.
Predict Your CFP® Board Exam Score
Benchmark your knowledge across all 8 Principal Knowledge Domains including the Psychology of Financial Planning.
- STCG: +$20,000
- LTCL: -$15,000
- Net Result: $20,000 (STCG) - $15,000 (LTCL) = $5,000 net STCG.
The strategy successfully reduced his taxable capital gain from $20,000 to $5,000. His new tax liability on this gain is $5,000 * 32% = $1,600. Tax Savings: $6,400 - $1,600 = $4,800.
Step 4: Check for a Wash Sale
This is the critical judgment step. David sold EnergyFund and immediately bought GigaEnergy ETF. Are these "substantially identical"?
- The Judgment: Since these are two different ETFs from different issuers, even if they both track the energy sector, they are generally not considered substantially identical by the IRS. They track different underlying indexes and have different expense ratios and holdings. Therefore, the wash sale rule is not triggered.
- The Basis: Because the loss is allowed, David's basis in the new GigaEnergy ETF is simply what he paid for it: $25,000.
> ⚠️ Exam trap: > The tempting wrong answer is to assume the wash sale rule applies because both ETFs are in the "energy sector." If the rule had been triggered, the $15,000 loss would be disallowed. The basis in the new GigaEnergy ETF would become its purchase price ($25,000) plus the disallowed loss ($15,000), for a total basis of $40,000. The exam will absolutely have this as an answer choice to catch candidates who misinterpret "substantially identical."
Your ability to make this distinction is what separates a passing score from a failing one. The VoraPrep adaptive engine is designed to drill you on these judgment-based scenarios until they become second nature.
Practice Questions: Test Yourself on Tax-Loss Harvesting
Reading is one thing; applying it under pressure is another. Here are a few exam-style questions. VoraPrep's question bank has over 6,900 questions, including many more on tax-loss harvesting, to build your confidence.
Sample Question 1> Priya, age 45, has a taxable investment account. Earlier this year, she realized a $12,000 short-term capital gain. She also holds 200 shares of XYZ Corp, which she purchased on January 15, 2026, for $100 per share. On December 1, 2026, she sells all 200 shares for $70 per share. On December 20, 2026, she purchases 200 shares of XYZ Corp for $65 per share. What is Priya's net reportable capital gain or loss for 2026? > > A. $12,000 short-term capital gain > B. $6,000 short-term capital gain > C. $9,000 short-term capital gain > D. $12,000 short-term capital gain and a $6,000 short-term capital loss carryforward
Answer: A Explanation: Priya realized a loss of ($100 - $70) 200 = $6,000 on the sale of XYZ Corp. However, she purchased the same stock within 30 days of the sale, triggering the wash sale rule. The $6,000 loss is disallowed for 2026. Therefore, her only reportable event is the $12,000 short-term capital gain. The disallowed loss is added to the basis of her new shares ($65 200) + $6,000 = $13,000 + $6,000 = $19,000. Sample Question 2> Javier, a single filer with high ordinary income, realized a $15,000 long-term capital gain in his taxable brokerage account. He also realized a $25,000 short-term capital loss during the same year. After all netting, what is the impact on Javier's taxes for the year? > > A. A $3,000 deduction against ordinary income and a $7,000 short-term capital loss carryforward. > B. A $10,000 short-term capital loss deduction against ordinary income. > C. No tax impact, and a $10,000 short-term capital loss carryforward. > D. A $3,000 deduction against ordinary income and a $7,000 long-term capital loss carryforward.
Answer: A Explanation: The netting rules require offsetting the $15,000 LTCG against the $25,000 STCL. This leaves a net short-term capital loss of $10,000. Of this amount, Javier can deduct $3,000 against his ordinary income. The remaining $7,000 is carried forward to future years and retains its character as a short-term capital loss. Sample Question 3> Kenji, age 45, realized a $25,000 long-term capital gain in his taxable brokerage account during 2026. He also holds 100 shares of a Total Stock Market Index mutual fund with a $10,000 unrealized loss. To harvest the loss, which of the following actions could he take WITHOUT triggering the wash sale rule? > > A. Sell the mutual fund and buy an S&P 500 Index ETF the next day. > B. Sell the mutual fund and buy shares of the same fund in his wife's IRA account. > C. Sell the mutual fund and buy a different share class of the exact same fund. > D. Sell the mutual fund and repurchase it 25 days later.
Answer: A Explanation: A Total Stock Market Index fund and an S&P 500 Index fund track different benchmarks, making them not substantially identical. This allows the loss to be harvested while maintaining broad market exposure. Option B is a trap; the IRS wash sale rules extend to spouses and IRA accounts. Option C is incorrect as different share classes of the same fund are typically considered substantially identical. Option D is incorrect because repurchasing within 30 days triggers the rule.Ready for more? You can find more targeted practice questions in the full VoraPrep adaptive QBank.
Study Tips and Exam-Day Strategy
Success on this topic comes from active practice, not passive reading.
- Integrate, Don't Isolate: Study tax-loss harvesting in the context of overall portfolio management. It's not a standalone trick; it's a technique used during rebalancing or when shifting a client's asset allocation.
- Drill the Flowchart: Don't just read the netting rules. Create a simple flowchart and run every practice problem through it. (1) Net ST. (2) Net LT. (3) Net the results. (4) Apply the $3,000 rule. (5) Calculate carryforward. This builds muscle memory.
- Focus on "Substantially Identical": Create your own list of examples that are and are not substantially identical. This is a judgment-based area, and seeing multiple examples is key. Our AI tutor, Vory, can generate unlimited scenarios for you to test your understanding.
- Final Week Review: In the last week before your exam, don't re-read the entire chapter. Instead, do 10-15 practice questions focused solely on tax-loss harvesting. This will sharpen your application skills when you're fatigued. Pay close attention to the explanations for any you get wrong. This topic connects closely with other tax planning concepts, like those covered in our guide to Above-the-line deductions.
Frequently Asked Questions
How many questions on tax-loss harvesting appear on the CFP exam? There is no set number, but as a core competency within the Investment Planning section (17% of the exam), you should expect to see the concept tested in 2-4 questions, either directly or as part of a larger case study. What's the best way to study tax-loss harvesting for the CFP exam? The most effective method is active problem-solving. After understanding the core rules (wash sale, netting), immediately apply them to dozens of practice questions. Focus on the explanations for both right and wrong answers to understand the examiner's logic. Is tax-loss harvesting tested in case studies or only MCQs? It is primarily tested in standalone multiple-choice questions. However, the logic could easily be one component of a larger case study that requires you to analyze a client's complete financial picture and make a series of recommendations. How long should I spend studying tax-loss harvesting? Don't think of it in isolation. It should be an integrated part of your 250-300 hours of total study time. Dedicate a few focused sessions to mastering the mechanics, but the real learning comes from encountering it repeatedly in mixed practice sets.---
Ready to Pass Your CFP Exam?Tax-loss harvesting is just one of the dozens of critical topics you need to master. VoraPrep's adaptive learning engine identifies your weak spots and delivers targeted practice from our bank of over 6,900 questions. With our 24/7 Vory tutor and detailed explanations for every question, you'll learn to think like the examiner.
Visit voraprep.com to get started.
Start Your Free 14-Day Trial at voraprep.com →