How to use the NOL carryforward calculator
A net operating loss from an earlier year can reduce the taxable income of a profitable year, but usually not all of it. The deduction is capped at a share of taxable income, and older losses also had a deadline for using them up.
Choose when the loss arose to fill the limit with a default, then edit it if your situation differs. Add the loss year, the current year and a carryforward window to have the tool check whether the loss has expired; leave the window blank for losses that carry forward indefinitely.
| Feature | Loss arising before 2018 | Loss arising 2018 or later |
|---|---|---|
| Annual deduction limit | Generally full taxable income | Share of taxable income (80% baseline) |
| Carryforward period | Limited number of years | Indefinite |
The table is a general outline and the rules have been suspended and restored by later legislation, so confirm the treatment for your tax year. This tool models carryforwards only and does not calculate carryback refunds or state-level limits.
Frequently asked questions
For losses arising in 2018 and later, the Tax Cuts and Jobs Act capped the net operating loss deduction at a share of taxable income, so a large carryforward cannot wipe out a profitable year entirely. Older losses generally were not subject to that cap. The percentage is editable because the rule has been suspended and restored before.
Losses arising in 2018 and later generally carry forward indefinitely, so you can leave the carryforward years field blank. Older losses had a fixed carryforward window, and if you enter that window along with the loss year and the current year, the tool checks whether the loss has expired.
Carrybacks were broadly eliminated for most taxpayers, with temporary exceptions granted by later legislation, and some farming businesses still qualify. This calculator only models carryforwards and does not compute refunds from a carryback claim.