For 2018 the IRS description for business code 485300 has been updated to "Taxi, limousine, & ridesharing service." That clarifies that this is the correct code for an Uber or other ridesharing driver.
485310 is taxi and ridesharing services. 485320 is limousine service. You want the first.
Codes 485310 and 485320 are not in the IRS list of principal business codes in the instructions for Schedule C. The code on Schedule C is supposed to come from the list in the Schedule C instructions, not from other lists of business classification codes.
The IRS instructions for Schedule C say "Enter on line B the six-digit code from the Principal Business or Professional Activity Codes chart at the end of these instructions."
I need the code for my tax service discount as an Uber driver
Uber usually provides a link that leads you to the discount page to log into TurboTax. Please refer to the following FAQ for more information. How do I get my TurboTax affiliate partner discoun ...