A business sale, an RSU vest, a property closing - the gain you can already see coming has a tax bill attached. The investors who win that day started losing on purpose, years earlier. It is called a loss bank, and here is how it works.
Most people meet their biggest tax bill at the worst possible moment. The business sells. The RSUs vest. The rental property closes. A number that was theoretical for years becomes real all at once, and a large slice of it is now owed to the IRS in a single tax year. By the time the windfall lands, the planning window has mostly closed.
At that point there are usually two moves, and both are expensive: pay the full tax and move on, or scramble to manufacture deductions in a hurry, which rarely ends well. There is a third option, but it only exists if you started early. You walk into the windfall with a stockpile of losses already built, ready to absorb the gain. That stockpile is a loss bank.
The best time to start harvesting losses is years before the gain you are trying to offset. A loss bank is planning for a tax bill you can already see coming.
When you sell an investment below what you paid, you realize a capital loss. That loss offsets capital gains dollar for dollar. Offset every gain you have and any leftover loss does not disappear - it carries forward, year after year, with no expiration. A loss you realize in 2026 can still be sitting on your tax return waiting to offset a gain in 2032.
A loss bank is simply those carried-forward losses, accumulated on purpose. You harvest losses in the years when they are available, bank them, and let them wait. When a large gain finally arrives, the bank is there to meet it.
The engine for most loss banks is direct indexing: owning the individual stocks that make up an index rather than a fund that holds them for you. The market exposure is nearly identical. The tax treatment is not.
Because you own the individual names, you can harvest losses at the security level - even in a year the index finishes up. On any given day, some stocks are down while the index is flat or higher. You sell the ones below your cost basis, immediately replace them with similar exposure so your portfolio barely moves, and bank the loss. A fund cannot pass that through to you. You can capture it continuously.
Layer in a long/short approach and the opportunity set grows again, because losses can be generated regardless of which way the market moves. The earlier you start, the more the bank compounds - and the more there is to harvest, since fresh capital and market volatility are what create losses in the first place.
The value scales with your tax rate and your portfolio size. In a normal-volatility market, a well-run direct indexing strategy can realize losses worth several percent of the portfolio in its early years. On a $5M taxable account, harvesting in the range of 3% to 5% a year builds $150K to $250K of banked losses annually. Over a few years, that can grow into a seven-figure loss bank.
Now the exit arrives. Say the business sale throws off a $2M long-term capital gain. A $1M loss bank cuts the taxable gain in half. For a high-bracket California resident facing a combined long-term rate north of 30%, that is potentially more than $300K that stays invested instead of going to tax. Same gain. The only difference is that you prepared for it.
This only works under real conditions. A loss bank requires a taxable account; inside an IRA or 401(k) there are no gains to offset and nothing to harvest. The losses are most abundant early and when markets are choppy, which is exactly why waiting until the windfall is in sight is too late. The harvesting has to respect the wash sale rules, which means replacing a sold position with similar but not substantially identical exposure - done carelessly, the loss is disallowed.
And a loss bank is not a market bet. Your exposure stays intact the entire time; only the tax lots underneath it change. The bank does nothing for you until a gain shows up to absorb it. The point is to have it ready before that day, not to scramble for it after.
Most advisors treat tax-loss harvesting as a December chore - a once-a-year sweep, if it happens at all. Most index funds bury the opportunity inside the fund where you can never reach it. The result is that the single most useful tax asset a high earner can own is left unbuilt, year after year, until the gain that could have been offset is already taxed.
We run it the other way: a year-round engine, built on purpose, before the windfall is even visible. If you can see a liquidity event somewhere on your horizon, the time to start the bank is now - not the quarter it closes.
Have a liquidity event on the horizon - a business sale, an RSU vest, a property sale? Let's look at what a loss bank could offset for your specific situation.
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