My company provides full charge bookkeeping for small businesses, mostly in service and SaaS. I'm also an experienced business owner and have handled my own taxes for S and C corps and closely held foreign companies.
However, I'm not a CPA and I don't have CPAs on staff. Our focus is on mangerial accounting vs. compliance. What I would like is to connect with CPAs who would offer a review and advisory letter (eg. with bulllet points, "do not increase owner equity, move that amount to retained earnings"; "meals and entertainment is abnormally high, please ensure it is accurate"). The tax filings are then signed by clients, who can agree to whatever release is needed.
This was how I did my own corporate filings and would like to offer this benefit to my clients. I prefer to work in Xero but also have some clients in Quickbooks. We could share spreadsheets but I'd prefer to just give review access.
If you're a CPA who can think a little outside the box and provide a high value...