Client accounting services (CAS) are ongoing, year-round accounting services that a CPA firm provides to its clients, covering bookkeeping, monthly close, financial reporting, and advisory support. Instead of only filing taxes once a year, the firm becomes a continuous financial partner. Many firms deliver CAS through an outsourced, white-label team.
If you run a business, CAS means a CPA firm handles your accounting all year, not just at tax time. If you run a CPA firm, CAS is one of the most dependable ways to build recurring revenue, provided you can staff it. This guide explains what CAS includes, why firms are adding it, and how outsourcing lets you scale it without building a department from scratch.
What Are Client Accounting Services?
Traditional accounting centers on periodic compliance work: tax returns, year-end financial statements, and filing deadlines. CAS extends that into continuous support. The firm keeps the books each month, closes the period, produces reports, and meets with the client to explain what the numbers mean.
For a business owner, that means clear answers to questions like why profit changed this month, whether cash flow is improving, and whether you can afford to hire. For a CPA firm, it means a service line that earns fees every month instead of only in busy season.
Naming varies. CPA.com and the AICPA often say “client advisory services,” and many firms use CAAS for client accounting and advisory services. The terms overlap heavily in practice.
What Do Client Accounting Services Include?
Most CAS offerings fall into three tiers:
| Tier | What it covers |
|---|---|
| Tier 1: Bookkeeping | Transaction coding, bank and credit card reconciliations, AP/AR upkeep, payroll support |
| Tier 2: Accounting and controller | Month-end close, accruals, financial statements, supporting schedules (fixed assets, prepaids, loans), accounting software administration |
| Tier 3: CFO-level advisory | Budgeting and forecasting, cash flow projections, KPI dashboards, variance analysis, lender or board reporting |
Most firms start at Tier 1 or 2 and move clients up as trust grows. That move pays off. In CPA.com’s 2024 benchmark survey, the small set of firms earning significant revenue from CFO or business-insights services reported more than 30% higher monthly recurring revenue than their peers.
CAS vs. bookkeeping
Bookkeeping records and reconciles transactions. CAS includes bookkeeping but adds the monthly close, reporting, analysis, and advisory conversations built on those numbers.
Why CPA Firms Are Adding CAS
Clients want timely numbers they can act on, and the data shows firms are responding. The 2024 CPA.com and AICPA CAS Benchmark Survey, based on 206 responses, found:
- Strong growth: CAS practices reported median revenue growth of 17%, continuing a double-digit trend seen in earlier surveys.
- Healthy margins: median CAS margin was 50% before partner salaries or draws.
- A shift in pricing: 84% of respondents are moving to fixed-fee billing, and only 10% price purely on time and charges incurred.
For the firm, the benefits are practical:
- Recurring revenue that smooths out tax-season peaks and valleys.
- Higher client lifetime value, since you earn more per client than from tax work alone.
- Better retention, because clients who rely on you monthly rarely leave.
- A stronger advisory position, because year-round numbers make timely advice possible.
The Problem With Building CAS In-House
The same survey lists staffing first among the obstacles firms cite, and the reasons are easy to see. A CAS team needs experienced bookkeepers, CAS managers, quality control processes, accounting technology, training systems, and client communication workflows.
Every hire also carries recruiting fees, benefits, payroll taxes, software, training, and management time before that person generates billable revenue. CPA.com recommends dedicated CAS staff rather than borrowing from tax or audit teams, and 78% of surveyed practices say they are committed to it. That means adding headcount, not stretching the people you have.
The result is a ceiling. When every new client requires another hire, growth slows, and many firms end up turning away CAS work they would gladly take.
How Outsourced Client Accounting Services Work
With outsourced CAS, your firm hands delivery work to an external, white-label accounting team. Your firm’s name stays on every deliverable. The outsourced team works inside your accounting software under your logins and permissions, follows your checklists, and passes work to your reviewer before anything reaches the client.
| Stays with your firm | Outsourced |
|---|---|
| Client relationship | Transaction processing and categorization |
| Scoping and pricing | Bank and credit card reconciliations |
| Final review and sign-off | Month-end close preparation |
| Advisory conversations | Draft reporting packages, AP/AR processing |
This is already common practice. In the CPA.com survey, about 41% of firms said they use outsourced or offshore staff to support CAS. Through CPA outsourcing services, firms add capacity for accounting and bookkeeping, financial reporting, and CFO-level advisory support without carrying permanent overhead. For a closer look at in-house costs, see our guide to outsourced bookkeeping for CPA firms.
How to Price CAS and Protect Your Margin
Hourly billing works against CAS. Clients do not want to watch the clock on routine monthly work, and fixed scopes are easier to sell.
| Pricing model | How it works | Best for |
|---|---|---|
| Fixed monthly fee by package | Set fee for a defined scope and volume | Bookkeeping and monthly close |
| Subscription tiers | Basic, Growth, and Advisory packages | Many similar clients |
| Value pricing | Fee reflects outcome, not hours | CFO-level advisory |
In the survey, the median typical monthly CAS fee was $3,000. To protect your margin when delivery is outsourced:
- Write the scope down: bank accounts, monthly transaction volume, entities, and reporting deliverables.
- Use a change-order process for work outside the package.
- Price on the value you provide and your review time, not only delivery cost.
- Track hours per client per tier to see which packages are profitable.
What to Look for in a CAS Outsourcing Partner
A good partner should feel like an extension of your firm. Check these areas before you commit:
- Accounting experience: familiarity with bookkeeping standards, month-end close, financial reporting, and client communication.
- Security: multi-factor authentication, role-based permissions, encryption in transit and at rest, confidentiality agreements, and clear data return terms. Ask to see a SOC 2 report.
- Scalability: capacity for busy seasons and new clients.
- Technology fit: comfort working in QuickBooks Online, Xero, Sage Intacct, NetSuite, and Bill.com.
- Quality control: documented review procedures, accuracy checks, and training.
Our guide on how to choose the right CPA outsourcing partner walks through the questions to ask, and you can compare leading CPA outsourcing providers side by side.
How to Get Started With CAS Under Your Own Brand
You do not need to rebuild your firm. Start small:
- Identify existing opportunities. Look for clients already asking for monthly bookkeeping, cash flow reporting, or financial insights.
- Define your packages. For example, Basic (bookkeeping, reconciliations, financial statements), Growth (adds budgeting and monthly review meetings), and Advisory (adds analysis, forecasting, and strategic guidance).
- Build delivery capacity. Partner with an outsourcing provider before you promote CAS, so you can deliver consistently.
- Stay focused on relationships. Spend your time on client goals, advice, and trust.
- Pilot, measure, then scale. Start with a small group of clients, track hours, turnaround, and margin per package, adjust scope and pricing, then open CAS to your wider client base. Standardized processes, as covered in our 12 best accounting practices for CPA firms, make this step far easier.
Ready to offer more accounting services without the hiring hassle?
Schedule a Consultation and see how Corient can support your CAS growth.
People Also Ask:
What are client accounting services?
Client accounting services (CAS) are ongoing accounting services, including bookkeeping, monthly reporting, and advisory, that a CPA firm provides throughout the year rather than only at tax time.
What is the difference between CAS and CAAS?
CAAS (client accounting and advisory services) is CAS with a stronger advisory layer, such as forecasting, budgeting, and KPI reviews. The terms are often used interchangeably.
How much do client accounting services cost?
Yes, outsourcing CAS can be secure when firms choose providers with strong data protection practices, secure technology systems, and clear confidentiality procedures.
How much do client accounting services cost?
Pricing depends on scope, transaction volume, number of entities, and service tier. Most firms charge a fixed monthly fee per package, and the CPA.com survey reported a median typical monthly fee of $3,000. If you outsource delivery, your cost is typically a monthly fee based on the hours or volume your partner handles.
Is outsourcing CAS secure for CPA firms?
It can be, when the provider has strong data protection practices, secure access controls, confidentiality agreements, and independent assurance such as a SOC 2 report.
Conclusion:
Client accounting services let CPA firms move beyond compliance work and become year-round financial partners. You do not need a large internal team to get there. A flexible model built on strong processes, modern technology, and the right outsourcing partner lets you add clients without adding unsustainable overhead.
Ready to offer more accounting services without the hiring hassle? Contact Corient to see how outsourced accounting support can help your firm add capacity, improve efficiency, and grow with confidence.
