I live with my parents and run a business online and was wondering if I can deduct my phone bill, internet, and utilities. These bills are under their name, not mine. I do have proof of checks written to my dad but I'm not sure if since it's not in my name if I can deduct it from my business expense since I don't own the house and I just live here.
Also I can deduct the full price of a brand new iPhone right? I bought it for my business and do have a receipt.
Yes, you may deduct the portion of the bill as business expense on your Schedule C. The cancelled checks were proof of payments and should be attached to the completed Form 1040. You don't need to owned a home to claim those expenses.
Correct, you do not have to attach proof of payment for business expenses to your tax return - just report the amounts paid in the Business Income and Expenses interview of TurboTax Self-employed (or Home & Business).
A "cancelled check" is a copy of the check you wrote your Dad that has been processed for payment by the bank. In many cases, these can be accessed (or printed) by logging in to your bank account online.