Turbotx does not support 2016 through 2020. If you're due for any of those years, they've been forfeited due to late filing. If you owe, you should probably file first because penalties and interest are increasing every day.
For 2021-2023, you must purchase a desktop version because online preparation is closed. you won't be able to e-file. Any W-2s and other withholding forms need to be attached. You should still be able to get any refunds (2021 final due date is 4/15/2025). if you owe penalties and interest are increasing every day
https://turbotax.intuit.com/personal-taxes/past-years-products/2021/
2024 can be done either online or using a desktop version. Destop may be best because all the prior returns will have been done on desktop. you cannot download the xxxx.tax2023 file to your online account to aid in the preparation of 2024
https://turbotax.intuit.com/personal-taxes/cd-download/install-turbotax/
