Hi Julianna,
Thanks for your question - If you want to be 1.5C committed then you can use the BA1.5 C letter, but if you just want a regular SBT commitment then you can do our standard letter.
We are currently developing a foundations paper for Financial Institutions’ net zero targets and you can find more information here How does the Net Zero Standard road test for companies intersects with the SBTi-FI work? Is it useful for the FI to participate in the road-test and will the net-zero for financial institutions be addressed?