If it does not let you complete do you still get your stimulus into your banking account

What are you trying to do?   You cannot e-file a 2020 tax return yet if that is what you are trying to do.  The 2020 tax year is not over.  The IRS will not begin to accept 2020 tax returns until the end of January.  

If you are worried about the next stimulus check--which has not yet passed or been signed into law--you cannot change your banking information from this site at this time.

Your banking information cannot be changed after your tax return has been filed and accepted.

Banking information does not go from TT to the IRS until you file your 2020 tax return and it is accepted. The IRS will begin to accept  and process 2020 returns at the end of January 2021.

You enter/change banking information in the FILE section before you file your 2020 return. Changing it on the TurboTax site does not do any good until you file your return and the IRS processes your return.   If they manage to start sending  out stimulus checks before you can change your information, we hope the IRS provides a way for you to change it with the IRS. Right now there are no new guidelines.   If your check goes to a wrong or closed account, it will be sent back to the IRS and then the IRS will mail a check to the address on your tax return.