Quotes - Defaulting the tax rate in tax rate select

Hi,

How can I default the tax rate for a quote? We have only 1 tax rate and want it displayed by default.

I've looked in studio and dropdowns, but cannot see an obvious way to default it - I thought 'Tax Rate' would have been a field in Studio that I could default, but this is not the case. So I'm suspecting that I need to look elsewhere or make a code-level change.

Could someone please point me in the right direction?

We're on SugarCRM 7.9.2.0

Thanks in advance,

Gary.