Where can I find my vehicle registration bill in order to enter the deductible portion of my car registration fee?

You can probably log into your local department of motor vehicles and download a copy of your vehicle registration invoice. The portion that is calculated based on the value of your vehicle would be the amount you can deduct.

That would have to be in your own financial records if you paid to register your car.  And... car registration is only  deductible in a few states.

 

 

Federal>Deductions and Credits>Cars and Other Things You Own>Car Registration Fees

 

 

https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-credits-deductions/car-registration-fee-deductible/L0NkGtxYR_US_en_US?uid=ldkhmrss

 

https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-credits-deductions/car-registration-fee-deductible/L0NkGtxYR_US_en_US?uid=ltrwny3c

 

 

You are posting from the Free Edition.  Itemized deductions are not supported by the Free Edison--so be careful about entering something that can trigger an upgrade to a paid version.  Unless you have a LOT of other itemized deductions like mortgage interest and property tax, car registration will have no effect at all on your refund or tax due.