Loss Carryforward

A loss carryforward—sometimes called a tax loss carryforward or capital loss carryforward—arises when a taxpayer realizes more losses than they can use in a single tax year. Rather than losing the benefit of those excess losses permanently, the tax code generally permits them to be carried forward and applied against gains or income in subsequent years. The rules governing how long losses may be carried, and what types of income they may offset, vary by loss category and are set by law.

For wealthy families with active investment portfolios, carryforwards can be a meaningful asset on the tax balance sheet. A family that realized large losses during a market downturn might carry those losses forward to offset future capital gains—effectively reducing or deferring the tax on profitable sales in later years. This is closely related to tax-loss harvesting, a strategy in which losses are deliberately realized to build a carryforward balance that can be deployed strategically.

Consider a hypothetical family office that sold a concentrated stock position at a large loss. Even if the family had no gains that year to absorb the loss, the unused amount carries forward—potentially sheltering gains on future sales of private-market investments or other assets. A common confusion is treating a carryforward as equivalent to cash; it is a tax attribute that has value only when future gains exist to absorb it. A CPA should track and verify carryforward balances, as they can be limited or lost in certain transactions.