Hey @anon84167843 and welcome to the Asana Community Forum 
One option could be creating a separate project where you just add your accountant. Then you set up a rule in the other project and depending on a specific trigger those tasks (or form submissions) are multi-homed in the specific project that the accountant has access to.
Another option would be working with tools such as Zapier to set up rules that would email information to the accountant.
Alternatively you can also have a look at Flowsana