If you use your bike exclusively for work, you can deduct all of the maintenance expenses.
If not, you should prorate your expense for business miles.
To enter your bike maintenance fees in TurboTax Self Employed:
Type in schedule c in the search box, top right of your screen
Click on the first category Jump to
schedule c link
Follow the prompts and online instructions
Arrive at the Your Business page
Scroll down to the Business
Expense category
Click start or update next to Other
Common Business Expenses category
Arrive
at the
Let's write off some business expenses page
Scroll down to the Repairs and Maintenance category
Click
Start or Update to make your entry