How do I deduct the capital loss carryover from my 2020 return?

You should have a copy of your 2020 Capital Loss Carryover Form.  If you used TurboTax in 2020 it should have pre-populated.  If it did not you can post it manually.

1. Start at Wages & Income

2. Scroll to Investment income

3. Select Capital loss Carryover

4. Make your corrections

 You are allowed a maximum capital loss in any one year of $3,000, and any excess loss can be carried forward to future years to offset gains. Each subsequent year also has a maximum loss limitation of $3,000.

There is no limit to the number of years you can carry a capital loss forward. However, you are not allowed to carry a capital loss back to a year before the capital loss occurred.