Capital Gains in Retirement: Harvesting, Losses, and Basis

Two schedules, one return

A capital gain is the difference between what you sell an asset for and your basis in it, which is usually what you paid plus reinvested dividends and certain adjustments. Nothing is taxed until you sell. An unrealized gain, however large, is not on your return.

Holding period decides which schedule applies. Assets held more than one year produce long-term gains, taxed at preferential federal rates. Assets held a year or less produce short-term gains, taxed as ordinary income at your regular bracket. For a retiree selling positions accumulated over decades, nearly everything is long-term, which is the favorable case.

The long-term schedule has three bands, and the lowest is zero percent. The thresholds that separate them are adjusted annually, so any figure printed in an article ages out. What does not change is the structure, and the structure is what you plan against.

The zero percent band

The zero band is governed by your total taxable income for the year, with the gain itself counted in. That has two consequences people find counterintuitive.

The first is that the gain does not have to be small. A household with little other income can realize a substantial long-term gain and have much of it fall inside the zero band, because what is being measured is total taxable income rather than the gain in isolation.

The second is that the band fills from the bottom. Ordinary income, including a traditional IRA withdrawal or a Roth conversion, occupies the lower part of the stack first, and long-term gains sit on top of it. Convert aggressively in a given year and the room available at zero percent shrinks or disappears. The two strategies compete for the same space.

Deliberately realizing a gain to use that room is sometimes called gain harvesting. Because there is no wash sale rule for gains, you can sell and immediately repurchase the same position, which resets your basis upward at no federal capital gains cost. A future sale then starts from the higher basis. The point is not the cash; it is the basis.

What else a gain touches

Here is where the arithmetic stops being about capital gains. A realized gain raises adjusted gross income, and several things in a retiree's return are tested against that figure.

• Social Security taxation. A gain increases provisional income, which can pull more of your benefit into taxable income. The mechanics are in the Social Security tax torpedo.
• Medicare premiums. Income from this year sets your premium tier two years from now, and the tiers are cliffs rather than ramps. Covered in coordinating income, Medicare, and investments.
• The senior deduction. It phases out above stated income levels, so a gain large enough to cross one reduces it. Covered in new federal deductions for retirees.
• Marketplace health coverage. If you retired before 65 and are buying coverage on an exchange, a realized gain can reduce a premium credit for that year.

None of that means gains should be avoided. It means a gain harvest is sized against the same model as a conversion, against the same thresholds, in the same conversation. Doing it in isolation is how people realize a gain at zero percent and pay for it twice over somewhere else on the return.

Losses, offsets, and carryforward

Realized losses are useful, and the order in which they apply is fixed by statute.

Losses first offset gains of the same type, short against short and long against long. Any excess then offsets gains of the other type. If losses still remain after all gains are absorbed, up to $3,000 can offset ordinary income in that year, a figure set in law and not adjusted for inflation. Anything still left carries forward indefinitely, keeping its character, and can be used in future years under the same ordering.

That carryforward is an asset worth tracking. A retiree who harvested losses during a bad market year may hold a reserve that can absorb gains for years afterward, which changes the calculus on rebalancing a concentrated position.

One rule constrains all of this. If you sell at a loss and buy the same or a substantially identical security within 30 days before or after the sale, the loss is disallowed and added to the basis of the replacement. The window runs both directions, and it includes purchases in other accounts you control, including an IRA. Automatic dividend reinvestment is a common way people trigger it without noticing.

Asset location

Asset allocation decides what you own. Asset location decides which account holds it, and it matters more once the accounts are being drawn down.

The general logic is that holdings generating regularly taxed income are often better placed in tax-deferred or tax-free accounts, while holdings expected to appreciate over long periods have an argument for sitting in the taxable account, where the gain is deferred until sale, taxed on the preferential schedule, and potentially reaches the basis adjustment described below.

Location is a secondary consideration to allocation and to your spending needs. It is also constrained by what is already where, and moving assets between account types is itself a taxable event in some directions.

The basis adjustment at death

This is the provision that argues against harvesting everything, and it is frequently the single largest tax factor in a taxable portfolio.

When an asset in a taxable account passes to heirs, its basis is generally adjusted to the value at the date of death. Decades of appreciation that were never realized are generally not taxed as capital gain to the heir, who starts from the new figure. An asset sold during life does not get that treatment.

The planning tension is direct. Spending from the taxable account realizes gains now. Spending from the IRA instead preserves those appreciated assets for the basis adjustment but accelerates ordinary income and may increase what heirs owe on the inherited retirement account. Which is better depends on the size of each bucket, your bracket, your heirs' brackets, and your actual intentions for the money.

Two cautions. Rules differ for jointly held property, community property, and certain trusts, and the estate itself may be exposed separately, which in this state begins well below the federal threshold. We cover that in the Illinois estate tax. Both questions belong with your CPA and your attorney rather than with a rule of thumb.

The Illinois exception

Illinois subtracts most qualified retirement income from state tax, which is why so little of the planning for an Illinois retiree happens at the state level. Capital gains are the exception.

A gain realized in a taxable brokerage account is not retirement income, so it is subject to the state's flat income tax along with interest, dividends, and any earned income. A withdrawal of the same size from a traditional IRA is not.

That does not override federal considerations, which remain much larger, but it does put a thumb on the scale in close cases and it surprises people who have been told Illinois does not tax retirees. The exemption is specific, and the brokerage account sits outside it.

Richard Casolari, Financial Advisor, Investment Advisor Representative, CFP®, has spent roughly fifty years in financial services. The practice is founder-led and based in Palos Heights, and the work coordinates tax-aware withdrawal sequencing and conversion analysis in coordination with your CPA, investment management, retirement income planning, and Medicare enrollment timing, into one written plan that is revisited on a schedule.