You can downgrade using the Clear and Start Over feature. In TurboTax Online, you can erase your return and start from scratch as long as you haven't submitted payment, deducted the TurboTax fee from your refund, or registered.
For additional information on how to switch to a lower-priced version of TurboTax Online please see the TurboTax FAQ below:
Taxes are due today and I could not clear and start over. That feature was not an option. I had to file and pay for self employed to avoid filing late. How do I get this resolved?