Will opening a Tally account affect my Credit score?

No. Opening a Tally account does not have any effect on your credit score, although as part of the account opening process we conduct a quick check (called a soft search) on the details you provided when setting up your account. 

More information about soft searches can be found at the following link:

https://www.equifax.co.uk/resources/loans_and_credit/soft-credit-searches-explained.html