First of all you should not be testing in your real online return. Everything you do gets saved. It will overwrite your real return. You can set up a new account to test in. You don't have to pay unless you want to print it.
You can use the same email address for 5 accounts. How to start another return in the Online version
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
Or you should use the Desktop CD/Download program. It can do more than 1 return. It has a What-If worksheet. You can copy your return to test in and has many other features and advantages over the online version.
