I forgot to include my registration fee on last year's taxes. Can I do it this year?

[robtm]

No, you cannot include registration fee paid last year on this years taxes. If it makes any difference then you must do an amended return for last year. 

[xmasbaby0]

And....if you did not itemize deductions for 2021, it is unlikely to make a bit of difference.   There are only a few states in which you can use the vehicle registration fees as an itemized deduction.

https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-credits-deductions/car-registration-...

If you need or want to amend:

See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...