Tax-Loss Harvesting: A Practical Guide for Investors

This page explains how the federal tax code treats losses you realize in a taxable investment account. It is a tax explainer, not investment advice. The Reed Corporation is a certified public accounting and tax firm. We do not recommend which securities to buy or sell, and we do not manage portfolios. Nothing here tells you to trade. What we describe is how a realized loss is reported and used after you or your own licensed advisor decide to sell. Harvesting is a timing tool. It changes when tax is paid, and sometimes how much, but it does not erase the eventual tax on an investment you later sell at a gain. Losses are listed on Form 8949 and summarized on Schedule D, and the governing rules sit in Publication 550.

Selling an investment that has fallen below its cost basis turns a paper loss into a realized loss that can offset gains you have already taken. A loss that exists only on a statement does nothing for your tax until you sell. Once realized, a capital loss first offsets capital gains of the same holding period, then gains of the other period, and any remainder can offset up to 3,000 dollars of ordinary income for the year. Whatever is still unused carries forward to later years. This tax loss harvesting guide walks through each of those steps in the answers that follow.

Suppose you hold a fund now worth 12,000 dollars that you bought for 20,000 dollars, and separately you already realized an 8,000 dollar gain earlier in the year. Selling the fund locks in an 8,000 dollar loss that cancels the 8,000 dollar gain, dropping the taxable gain to zero. If you had taken no gain at all, that same 8,000 dollar loss would offset 3,000 dollars of ordinary income this year and carry 5,000 dollars forward. A common mistake is believing a paper loss lowers your tax on its own. It does not. The loss has to be realized through a sale and reported before it counts for anything.

One more framing point helps before the details. A realized loss is only useful if you have gains to offset or ordinary income to reduce, so the value of harvesting depends on the rest of your return. A loss taken in a year with large short-term gains is worth more than the same loss in a year with only a small long-term gain, because short-term gains are taxed at higher ordinary rates. We look at the whole projected return before deciding whether a loss does much for you this year or is better saved through the carryforward.

One boundary matters before anything else. Harvesting only works in a taxable brokerage account. Losses inside an individual retirement account or a 401(k) have no current tax effect, because gains and losses inside those accounts are not reported year to year. So the same fund that produces a useful loss in your taxable account produces nothing if it is held in your retirement account. This is why the account location of a position, not only the position itself, decides whether a loss is available to you at all.

Going forward, treat this as a set of tax mechanics that your investment decisions feed into, rather than a reason to trade. The answers below cover the 3,000 dollar limit and the carryforward, the short-term and long-term netting order, the wash sale rule, and how lot selection changes the result. Our tax strategy consulting team and our individual tax return preparers apply these same rules when they build your Schedule D.

The offset happens in a set order on Schedule D. First you net your capital losses against your capital gains for the year. If losses exceed gains, the leftover net capital loss can reduce other income, but only up to 3,000 dollars in a single year, or 1,500 dollars if you file married separately. Any net loss beyond that limit does not vanish. It carries forward to the next year and keeps going until it is used. This ordering is not optional, and tax software follows it automatically once the trades are entered correctly. Publication 550 and the instructions behind Form 1040 spell out the same ordering.

The carryforward has no expiration during your lifetime. A large loss can shelter gains and shave 3,000 dollars off ordinary income year after year until the balance runs out. The carried loss keeps its character, so a long-term loss carried forward stays long-term and a short-term loss stays short-term, which affects how it nets in future years. One limit to remember is that capital losses generally do not pass to your heirs, so an unused carryforward can be lost at death if it was never applied.

Say you realize 25,000 dollars of capital losses in a year when you also took 6,000 dollars of capital gains. The losses first wipe out the 6,000 dollars of gains, leaving a 19,000 dollar net loss. Of that, 3,000 dollars reduces your ordinary income this year, and the remaining 16,000 dollars carries forward. Next year, if you have no gains, another 3,000 dollars comes off ordinary income, leaving 13,000 dollars to carry again. At 3,000 dollars a year, a purely carried loss like this takes more than five years to use up unless future gains absorb it faster.

A common mistake is expecting the whole 19,000 dollar loss to hit ordinary income in the first year. The annual cap is 3,000 dollars against ordinary income, no more, regardless of how large the loss is. Another frequent error is failing to carry the balance forward on the next return, which can strand thousands of dollars of deductions that were fully available. This tax loss harvesting guide keeps returning to one point. The 3,000 dollar cap is annual, but the carryforward itself does not expire while you are alive.

The 3,000 dollar figure has not changed in decades, so it does not keep pace with inflation, and a large loss can take many years to absorb through ordinary income alone. That is why offsetting gains is the faster path. Consider a couple filing jointly with a 40,000 dollar carryforward who then realize a 30,000 dollar gain the next year. The carryforward first cancels the entire 30,000 dollar gain, then 3,000 dollars of the remaining 10,000 dollars reduces ordinary income, leaving 7,000 dollars to carry again. The gain was covered at no current tax cost, which is worth far more than the slow annual 3,000 dollar reduction against wages.

Our individual tax return preparers track the carryforward from year to year so nothing is left behind, and our tax strategy consulting team estimates how quickly future gains might absorb it. The number sits on the Schedule D carryover worksheet, which is easy to overlook when you switch preparers or software. Going forward, keep your own record of the unused balance, because a carryforward is only as good as the return that remembers to claim it.

Every capital gain and loss carries a holding period. An asset held for one year or less is short-term, and its gain is taxed at your ordinary income rate. An asset held for more than one year is long-term, and its gain gets a lower long-term rate that reaches 20 percent at the top, with 15 percent and 0 percent brackets below it. On Schedule D, short-term losses first offset short-term gains, and long-term losses first offset long-term gains. Only after that within-group netting do you cross the two groups, applying any net loss in one group against a net gain in the other. Getting the sequence right is what makes the final number on Schedule D correct. Publication 550 and Form 8949 follow this same sequence.

The order matters because a short-term loss used against a short-term gain saves tax at the higher ordinary rate, while the same loss used against a long-term gain saves only at the lower long-term rate. If you have both kinds of gain, the holding period of the loss you harvest changes how much you actually save. A short-term loss is the more valuable tool when short-term gains are on the table. The reverse is also true. A long-term loss works fine against a long-term gain, and it only reaches a short-term gain after the within-group netting is done, which can still be an efficient result when you have no long-term gains to absorb it.

Imagine 10,000 dollars of short-term gain taxed at a 32 percent ordinary rate and 10,000 dollars of long-term gain taxed at 15 percent. A 10,000 dollar short-term loss, netted first against the short-term gain, saves 3,200 dollars. That same 10,000 dollar loss applied against the long-term gain would save only 1,500 dollars. The dollar amount of the loss is identical. The tax saved is more than twice as large when the holding periods are matched with intent rather than by default.

A common mistake is harvesting without checking holding periods, which can waste a valuable short-term loss against a low-rate long-term gain. Selling one lot instead of another can change a gain into a loss or shift a short-term result into a long-term one. Brokerage software nets by the statutory rules, but it does not decide which lots you sell, so the choice of what to harvest is still yours. This tax loss harvesting guide treats holding period as the first thing to check before you act, because the same loss is worth more against short-term income.

Timing around the one-year mark also matters. A position sold at day 364 produces a short-term result, while the same position sold two days later is long-term, and for a gain that difference can be the gap between the ordinary rate and the long-term rate. For a loss you are harvesting, a short-term loss is often the more useful one, so selling just before a lot crosses into long-term status can be the better tax move even though the economic position is identical. Consider a 9,000 dollar loss that is short-term. Against a short-term gain taxed at 35 percent it saves 3,150 dollars, while the same loss gone long-term and used against a long-term gain at 15 percent would save only 1,350 dollars.

Our tax strategy consulting team reviews the holding-period mix before year end, and our bookkeeping team keeps the purchase dates that decide short-term versus long-term status. The purchase confirmations and reinvestment records are what prove a holding period if a return is ever questioned. Going forward, sort your positions by holding period before you harvest, so each loss is aimed at the income it shelters best.

The wash sale rule is the trap that catches the most harvesters. If you sell a security at a loss and buy the same security, or one that is substantially identical, within 30 days before or 30 days after the sale, the loss is disallowed for the moment. That is a 61-day window centered on the sale date. The rule exists so a taxpayer cannot claim a loss while keeping the very same economic position. It is described in Publication 550, and a wash sale is flagged with a code on Form 8949 before it flows to Schedule D.

A disallowed loss is not gone. It is added to the cost basis of the replacement shares, and the holding period of the old shares tacks onto the new ones. When you finally sell the replacement shares without repurchasing, the deferred loss comes through. The rule reaches across all of your accounts, including your spouse’s accounts and your own individual retirement account. A repurchase inside an individual retirement account is the harsh case, because the basis add-back does not apply there, so the loss is permanently disallowed rather than deferred. Substantially identical is a facts question. Two share classes of the very same fund are usually treated as identical, while two different funds that merely track similar markets often are not, though the line can be close.

Say you sell 100 shares at a 5,000 dollar loss and buy 100 shares of the same fund ten days later in the same taxable account. The 5,000 dollar loss is disallowed for now and added to the basis of the new shares, so a later clean sale captures it. The deferred loss is still valuable, but only when you eventually let the position go without a quick repurchase. Now change one fact. If that repurchase happened inside your individual retirement account, the 5,000 dollar loss is lost for good, with no basis add-back to recover it. Same trade, very different outcome, driven only by which account did the buying.

A common mistake is harvesting in a taxable account while an automatic dividend reinvestment, a payroll retirement contribution, a robo-advisor rebalance, or a spouse’s separate purchase quietly buys the same fund inside the 61-day window. The wash sale section of this tax loss harvesting guide is where people slip most often, usually through automatic buying they forgot was switched on. Turning off reinvestment on a position you plan to harvest removes most of the risk.

There is a legitimate way to stay invested without a wash sale, and it is a tax point rather than a trading tip. If the replacement security is not substantially identical to the one you sold, the loss is allowed even though you bought back into the market. Where the line falls between merely similar and substantially identical is a facts question that turns on the specific holdings, and it is one to review carefully with your advisor before you act. Consider a taxpayer who harvests a 7,000 dollar loss and waits the full 31 days before repurchasing the identical fund. The wait sidesteps the rule entirely, and the 7,000 dollar loss is allowed in full this year.

Our bookkeeping team watches the trade dates across accounts so a reinvestment does not undo a harvest, and our tax strategy consulting team checks the 61-day window before and after any planned sale. Going forward, pause automatic reinvestment on any position you intend to harvest, and review every account you and your spouse hold, not only the one where the sale happens.

When you own several lots of the same security bought at different prices, the lot you choose to sell decides your gain or loss. Specific identification lets you name the exact shares to sell, usually the highest-cost lots, to produce the largest loss or the smallest gain. To use it, you tell the broker which lots to sell at or before the trade and keep the confirmation. If you say nothing, most brokers default to first-in first-out, which sells your oldest, often lowest-cost, shares first. Mutual funds may also offer an average-cost method. Keeping clear records is what makes specific identification hold up, because the method you claim has to match what the broker reported to the government. The basis rules behind all of this are in Publication 551, and the sale is reported on Schedule D.

Harvesting also reaches the 3.8 percent net investment income tax. A realized capital loss reduces your net capital gain, and net capital gain is part of the net investment income base on Form 8960. So a well-placed loss can save regular capital-gains tax and the extra 3.8 percent at the same time, which raises the real value of the loss for higher-income households. For a household already over the income threshold, that combined saving can approach a quarter of the loss in tax terms, depending on the bracket. The disposition rules that support all of this appear in Publication 544.

Suppose you hold two lots of one stock, one bought for 8,000 dollars and one bought for 15,000 dollars, and each lot is now worth 10,000 dollars. Selling the 15,000 dollar lot with specific identification realizes a 5,000 dollar loss. Selling the 8,000 dollar lot instead would realize a 2,000 dollar gain. Same stock, same sale-day price, opposite tax results, decided entirely by which lot you identify. A common mistake is letting the account default to first-in first-out, which can hand you a gain in the exact moment you were trying to harvest a loss. Over several lots and several years, that default can quietly convert intended losses into unwanted gains and push net investment income higher than needed.

Two habits separate the taxpayers who get real value from harvesting from those who leave money behind. The first is looking across the whole year rather than only in late December, because a sharp market dip in the spring can offer losses that have recovered by year end. The second is keeping the cost-basis records that let you prove which lots you sold, since the tax benefit rests on documentation the broker and the government can match. Consider a filer who harvests a 6,000 dollar loss in a March dip, then sees the position recover by December. The loss is locked in for the year even though the holding bounced back, as long as a wash sale did not undo it.

Use this tax loss harvesting guide as a starting point for the tax mechanics, not as a recommendation to buy or sell any security. Clients who want the numbers run against their own brokerage records can request a consultation with our team, and we will coordinate with your own investment advisor rather than direct your trades. Our bookkeeping team keeps the cost-basis and lot records that make specific identification possible. Our tax strategy consulting team plans the timing, and our individual tax return preparers report the result correctly on Schedule D. Going forward, confirm your broker’s default cost-basis method now, before your next sale, so the lot you sell is the lot you actually meant to sell.