The Actual Value of Tax-Loss Harvesting

This past year was not kind to the financial markets. The S&P 500, the most quoted index of US stocks, was down 4.4%. The MSCI emerging market index was down 14.2%, and small cap US stocks were down 8.5%.

The good news for Wealthfront clients is that tax-loss harvesting could yield tax savings to help offset some of this market downturn. As a matter of fact, we did more harvesting in the last year than at any time in our six years of offering the capability. Based on the methodology described below, new clients who joined in 2018 with a portfolio risk score of 8 (our most common risk score) on average received a pre-tax benefit equal to 12.47% of their portfolio value, which exceeded the markets’ decline. This was due primarily to our ability to take advantage of daily volatility (one of the many advantages of our software-based approach to tax-loss harvesting over the classic manual year-end approach).

Depending on our clients’ tax rates and ability to use the losses, this would have provided them an after-tax benefit of 3.12% to 6.24% of their portfolio values, which is an enormous multiple of our 0.25% annual advisory fee. There is the possibility that some of the benefit of our tax-loss harvesting could have been lost due to wash sales, but our past experience is that wash sales only affected 2.3% of our transactions.

How does tax-loss harvesting work?

As a refresher, tax-loss harvesting works by taking advantage of investments that have declined in value, which is a common occurrence in broadly diversified investment portfolios. By selling investments that have declined below their purchase price, a tax loss is generated, and that loss can be used to offset other taxable gains, thus lowering your taxes.

Investments sold in this manner can be replaced with alternate investments so that the risk and return profile of your portfolio remains unchanged, even as tax savings are created and reinvested to further grow the value of your portfolio. The more frequently you deposit, the more opportunities to do tax loss harvesting and therefore benefit from this strategy.

The value of tax-loss harvesting

Tax-loss harvesting creates value from tax rate arbitrage (trading that takes advantage of a difference in tax rates as the basis for profit) and compounding (letting your money grow over time). The vast majority of the losses we harvest are short-term, meaning the securities sold have been held for less than one year. These losses can be credited against your short-term capital gains and up to $3,000 of ordinary income each year (both of which are taxed at ordinary income rates).

The lower cost basis that results from the tax-loss harvesting transaction will ultimately increase your gains when you liquidate your portfolio, but if held for more than a year those gains will be taxed at long-term capital gains rates. Taxes paid in the future are not nearly as costly as those paid today due to the time value of money. Therefore, the ultimate value generated from tax-loss harvesting is the difference between the ordinary income taxes saved and the lower long-term taxes paid in the future. As mentioned before, the tax-loss harvesting benefit generated can be reinvested and compounded over time — the longer you invest, the greater the benefit.

Our tax-loss harvesting results over the past six years

We quantify the effectiveness of our ETF level daily tax-loss harvesting service by calculating its annual “harvesting yield.” Harvesting yield measures the quantity of harvested losses (short- or long-term) during a given period, divided by the value of the portfolio at the beginning of the period. The ultimate benefit each client will receive will depend on the riskiness of their portfolio and their particular tax rate.

The table below displays the actual average annual harvesting yield for the year in which clients first started using our tax-loss harvesting, known as the “client vintage,” and their portfolio risk score. The vintage is a fixed client characteristic, but clients can actually move across risk score groupings based on their risk score on a given day in the sample. The data includes all tax losses harvested through December 31, 2018.

The Actual Value of Tax-Loss Harvesting

On each day, we compute the aggregate losses harvested within portfolios of clients belonging to a given cohort, sum these losses across clients in the cohort, and divide them by the aggregate portfolio balance of clients belonging to the cohort, to obtain that day’s harvesting yield.

We then compute an annualized “since inception” harvesting yield for each cohort, by summing the daily harvesting yield figures, dividing by the number of trading days since inception, and multiplying by 252 (the number of trading days in a year).

Clients who started with us in 2012 with risk score 8 portfolios benefited from an average annual harvesting yield equal to 2.41% of their portfolio values. As you can see, harvesting yield generally increases as risk score increases (there are some aberrations due to small sample sizes). That’s because portfolios with higher risk scores should have higher volatility, which in turn creates more tax-loss harvesting opportunities. However, you should not increase your risk score to get more harvested losses, because it can lead to a portfolio with more volatility than you might be comfortable with. In that scenario, you could be compelled to withdraw at the worst possible time. (We explain why increasing your risk beyond what is appropriate can lead to very bad outcomes in The Right and Wrong Reasons to Change Your Risk Tolerance).

Average annual harvesting yield also decreases over time because, on average, your holdings should grow in value over time, which means it gets harder to generate losses other than with new deposits and dividend reinvestments. However, we were able to generate significant losses over time despite the market rising significantly (31%) over the past seven years. Large losses were harvested even in years in which the S&P 500 didn’t decline very much (2012, 2013, and 2017). This again speaks to the power of looking for losses daily rather than the traditional approach of only looking to harvest losses at year-end, because we can harvest losses during short-term downdrafts in years when the market rises.

Final thoughts

We publish our tax-loss harvesting results because we believe in being transparent and providing context. You might be surprised to learn that no other automated financial advisor publishes its tax-loss harvesting results. Based on our past experience with observing the rate at which our competitors harvest losses, we believe that is because they generate inferior results.

Unfortunately the process of harvesting of losses for all clients on a daily basis is far too complex for a human being to optimize. It’s just another example, along with automated financial planning, of why software can do a much better job of managing your money than people can.

*These calculations assume you could use all of the harvesting yield benefit, which is not the case for all our clients, although any unused benefit can be carried forward to future years.


This blog is powered by Wealthfront Advisers LLC (“Wealthfront Advisers,” and the successor investment adviser to Wealthfront Inc.). The information contained in this blog is provided for general informational purposes, and should not be construed as investment advice. Any links provided to other server sites are offered as a matter of convenience and are not intended to imply that Wealthfront Advisers or its affiliates endorses, sponsors, promotes and/or is affiliated with the owners of or participants in those sites, or endorses any information contained on those sites, unless expressly stated otherwise.

Nothing in this communication should be construed as an offer, recommendation, or solicitation to buy or sell any security. Wealthfront Adviser does not represent in any manner that the tax consequences described herein will be obtained or that Wealthfront Adviser’s tax-loss harvesting strategies, or any of its products and/or services, will result in any particular tax consequence for clients.

Wealthfront Adviser and its affiliates do not provide legal or tax advice and do not assume any liability for the tax consequences of any client transaction.  Clients should consult with their personal tax advisors regarding the tax consequences of investing with Wealthfront Advisers and engaging in these tax strategies, based on their particular circumstances. Clients and their personal tax advisors are responsible for how the transactions conducted in an account are reported to the IRS or any other taxing authority on the investor’s personal tax returns. Wealthfront assumes no responsibility for the tax consequences to any investor of any transaction.

Past performance is not indicative of future results. Expected returns and risk characteristics are no guarantee of actual performance. The table showing the Harvesting Yield for daily tax-loss harvesting clients is based on Wealthfront Advisers’ estimates from existing client data for accounts opened between October 1, 2012 (the launch of asset-class tax loss harvesting) and December 31, 2018. The table was based on the subset of our clients with tax-loss harvesting enabled in their accounts. When Wealthfront says it replaces investments with “alternate” investments as part of the tax-loss harvesting strategy, it is a reference to investments that are expected, but are not guaranteed, to perform similarly and that might lower an investor’s tax bill while maintaining a similar expected risk and return on the investor’s portfolio.

The effectiveness of the tax-loss harvesting strategy to reduce the tax liability of the client will depend on the client’s entire tax and investment profile, including purchases and dispositions in a client’s (or client’s spouse’s) accounts outside of Wealthfront and type of investments (e.g., taxable or nontaxable) or holding period (e.g., short- term or long-term).

Wealthfront Advisers’ investment strategies, including portfolio rebalancing and tax loss harvesting, can lead to high levels of trading. High levels of trading could result in (a) bid-ask spread expense; (b) trade executions that may occur at prices beyond the bid ask spread (if quantity demanded exceeds quantity available at the bid or ask); (c) trading that may adversely move prices, such that subsequent transactions occur at worse prices; (d) trading that may disqualify some dividends from qualified dividend treatment; (e) unfulfilled orders or portfolio drift, in the event that markets are disorderly or trading halts altogether; and (f) unforeseen trading errors. The performance of the new securities purchased through the tax-loss harvesting service may be better or worse than the performance of the securities that are sold for tax-loss harvesting purposes.

Tax loss harvesting may generate a higher number of trades due to attempts to capture losses. There is a chance that trading attributed to tax loss harvesting may create capital gains and wash sales and could be subject to higher transaction costs and market impacts. In addition, tax loss harvesting strategies may produce losses, which may not be offset by sufficient gains in the account and may be limited to a $3,000 deduction against income. The utilization of losses harvested through the strategy will depend upon the recognition of capital gains in the same or a future tax period, and in addition may be subject to limitations under applicable tax laws, e.g., if there are insufficient realized gains in the tax period, the use of harvested losses may be limited to a $3,000 deduction against income and distributions. Losses harvested through the strategy that are not utilized in the tax period when recognized (e.g., because of insufficient capital gains and/or significant capital loss carryforwards), generally may be carried forward to offset future capital gains, if any.

Wealthfront Advisers may from time to time publish content in this blog and/or on this site that has been created by affiliated or unaffiliated contributors. These contributors may include Wealthfront Advisers employees, other financial advisors, third-party authors who are paid a fee by Wealthfront Advisers, or other parties. Unless otherwise noted, the content of such posts does not necessarily represent the actual views or opinions of Wealthfront or any of its officers, directors, or employees. The opinions expressed by guest bloggers and/or blog interviewees are strictly their own and do not necessarily represent those of Wealthfront Advisers or any of its affiliates.  Wealthfront Advisers is a SEC registered investment adviser, and a wholly owned subsidiary of Wealthfront Corporation.

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