What is Client Accounting Services (CAS)? A firm guide

Client Accounting Services is the product name firms use when they stop selling hours and start selling a finance function. The client does not want a stack of transactions. They want to know the books are current, the bills are real, and someone will catch the weird ACH before it becomes a tax-season surprise.

CAS is sold as a growth engine. The close is the monthly proof. Both are right. CAS only scales if the work is packaged, the close is repeatable, and leftovers are visible — not buried in a chart of accounts.

A plain definition

CAS is recurring accounting work a firm does inside the client’s books. Typical scope: capture bank and card activity, code it, match receipts, pay or record bills, send invoices, close the month, and send a short report. Advisory sits on top of that only if the close actually finished.

The four layers buyers actually pay for

1. Capture — banks, receipts, bills, and invoices land in one place.
2. Post — obvious activity hits the ledger with a reason you can open later.
3. Exception — humans only see what the system cannot finish.
4. Advise — cash, margin, and tax posture after the books are closed.

Most software in this market covers layer four’s calendar (jobs, emails, due dates) and almost none of layers one through three. That is why a CAS team can be “fully utilized” and still miss the close.

How firms price CAS without lying to themselves

Hourly billing punishes you for getting faster. Flat fees punish you if scope is fuzzy. Value pricing only works when the client can see a leftover list and a close date. A workable starter menu:

• Core close — bank feed, receipts, monthly P&L and balance sheet, leftover review.
• Payables add-on — bills, vendors, and payment runs.
• Receivables add-on — invoices, reminders, and deposits.
• Controller hour — one scheduled review after close, not a vague “we’re available.”

Publish what is in and out. “Unlimited questions” is how CAS practices drown. Put questions that change the books in the leftover inbox. Put strategy on a calendar.

The stack problem

A common CAS stack is QuickBooks or Xero for the ledger, a practice tool for email and jobs, a portal for documents, and a close checklist in a spreadsheet. Each tool is defensible. Together they hide the only number that matters: how many client-months are actually closed.

ficary’s live product is the ledger and leftover inbox for the business owner, with an accountant seat to review the same books. The firm platform — jobs, email, portal, isolated data — is the build now underway. We will not pretend those modules are shipping today. We will keep writing about the close because that is the part CAS cannot fake.

First 90 days of a CAS line

1. Pick one niche so the chart of accounts and leftover reasons repeat.
2. Write a one-page engagement: systems you will live in, close day, and what the client must still do.
3. Move every “where is this receipt?” out of email and onto the transaction.
4. Measure closed months, not hours. If a client is open two months, pause new work.
5. Only then sell advisory. Advice on an open month is a liability.

If you want the longer buying lens, read How to choose accounting practice management software and Practice management vs ledger software.