What Are Client Accounting Services (CAS)?

Client accounting services (CAS) is a bundled offering where an accounting firm handles a business’s day-to-day finances and provides ongoing strategic guidance. Some firms call it CAAS, or client accounting and advisory services. The scope goes beyond traditional bookkeeping to cover payroll, bill pay, financial reporting, and advisory work like budgeting and forecasting. 

For businesses, CAS can be a way to outsource the full finance function instead of hiring in-house. For accounting, CAS is 1 of the fastest-growing service lines in the profession. Firms offering CAS report a median growth rate of 17%. 

Learn more about what CAS looks like in practice, including the services included, what it costs, and what makes an engagement run well from both sides. 

Key Points

• Client accounting services goes beyond traditional accounting practices into ongoing client advisement and strategic support. 
• Client accounting services is also referred to as client advisory services, especially as firms expand from bookkeeping into higher-level financial guidance. 
• According to CPA.com, firms offering CAS report a 61% increase in median reportable annual revenue, according to CPA.com. 
• The CAS model lets accounting firms offer higher-value services to clients, though these services can scale up or down as needed. 
• CAS tiers range from simple bookkeeping and tax support all the way up to virtual controllership. The right tools, such as automation software, can support CAS across all tiers. 

Client Accounting Services: Definition and Scope

CAS is an ongoing engagement in which an accounting firm manages a business’s financial operations and provides advisory support. The specific work varies by firm. Some might include strategic advisory in their CAS offering, while others limit it to transactional accounting. 

Because of that variation, CAS is best understood as a set of tiered services rather than a single fixed package.  

A transactional tier might cover bookkeeping and payroll. A mid-tier might add monthly reporting and cash flow analysis. A more advisory tier might deliver executive-level guidance on budget forecasting and financial strategy.  

Bookkeeping and Transaction Processing

At this tier, a CAS firm handles the day-to-day recordkeeping that a business needs to operate: 

• Accounts payable: Outgoing payments and expenses, invoice processing, vendor payments 
• Accounts receivable: Incoming payments, payment tracking, payment collection 
• Bank reconciliations: Accurate recording of business transactions 

Clean books support compliance and keep a business’s cash flow steady and predictable throughout the year. 

Payroll Coordination

Payroll is another foundational service most CAS engagements cover. A firm typically handles tasks like: 

• Running payroll and issuing employee payments 
• Calculating and remitting payroll tax withholdings 
• Filing quarterly and annual payroll tax returns (Forms 941, 940, W-2s, and 1099s) 
• Tracking wage-and-hour compliance 

Outsourcing payroll reduces the risk of filing errors and late-payment penalties, which is where small businesses can run into trouble with the IRS. 

Tax Support and Compliance

Tax work is a core part of CAS. A firm prepares business tax returns and tracks filing deadlines, while staying current on changes to tax law and accounting standards that could affect a client’s finances. 

Because a CAS firm works with a business year-round, it can flag tax-saving opportunities as they come up. A firm at this tier can also provide audit-readiness support and work alongside external auditors if a business is audited. Independence rules prevent the same firm from both keeping the books and performing the audit itself. 

Financial Reporting and Analysis

The next tier in CAS is quarterly or monthly financial reporting and analysis. Financial reporting involves communicating financial info to internal and external stakeholders. It’s often done by analyzing such financial statements as: 

• Balance sheets 
• Income statements, including profit-and-loss (P&L) forms 
• Cash flow reports 
• Securities and Exchange Commission (SEC) forms 
• Statements of shareholder equity 

Regular reporting shows a business where it stands financially and helps owners spot problems or opportunities earlier than they would from an annual review. 

Controllership and Advisory 

This is perhaps the most advanced tier within client accounting and advisory services. Instead of processing transactions and producing statements, the firm helps a business use its financial data to make decisions. Typical services at this tier include: 

• Tax planning and strategy (beyond annual filing) 
• Budgeting and cash flow forecasting 
• Financial modeling and scenario analysis 
• Key performance indicator (KPI) tracking and management reporting 
• Financial risk management 

CAS firms at this tier act as a virtual controller or, in some cases, an outsourced chief financial officer (CFO). The main advantage for a small business is access to executive-level financial guidance without a full-time salary. 

What Client Accounting Services Look Like in Practice 

CAS is among the fastest-growing lines in the accounting profession. According to Accounting Today, 85% of “top 100” firms reported growth in CAS last year. Consulting and advisory services alone accounted for 41% of that group’s total revenue. 

Here’s what CAS in accounting looks like day to day. 

Daily and Weekly Tasks

On a daily basis, a CAS firm might handle a client’s: 

• Financial transaction recording and capturing 
• Invoice processing 
• Transaction categorization 

A CAS team might log into a client’s accounting system—such as QuickBooks Online Accountant—every morning to review incoming transactions and process invoices. Automation handles a lot of the volume. Bank feeds pull transactions in automatically, so the books stay current without manual entry.  

Ultimately, the team’s job is to catch anything unusual, code transactions correctly, and flag items that need the client’s input. 

Month-End Routines

At month’s end, the goal is to make sure all transactions are accurately recorded and that the financial statements reflect what happened during that period. This usually involves a combination of reconciling accounts (across all sources) and creating and analyzing financial statements. 

The CAS team reviews the month’s results and discusses any trends or concerns with their client. This might be an issue with accounting and regulatory compliance, which they’ll either flag or fix. Or it might be cash flow or other budgetary concerns. All of this helps keep the business running smoothly and efficiently throughout the year. 

Escalation and Exception Handling

CAS teams need clear processes to handle discrepancies or unusual transactions. The same goes for answering client questions in a way that builds trust and positive rapport. 

Strong CAS firms have a clear process for handling these. That might mean small issues get resolved within the team, and anything that needs a decision or clarification gets routed to the client through an agreed-on channel. The point is to keep the work moving without letting open questions stall the close. 

Cost Factors and Engagement Structures 

Client accounting services aren’t cheap, but they can be more cost-effective than hiring in-house. The median annual wage for a full-time accountant is $81,680, according to the Bureau of Labor Statistics (BLS). A CAS engagement might cost a fraction of that. 

What Drives CAS Costs

The main cost factors are: 

• Transaction volume: Higher volume (like with invoice processing) costs more per month. 
• Reporting complexity: Companies with multi-state payroll or complex workplace benefits usually require more in-depth reporting and analysis. This also means higher costs. 
• Number of entities: Businesses with multiple entities (like subsidiaries) usually have more complex operations and pay more for CAS. 
• Integration needs: Having to migrate data from 1 platform to another may cost more upfront. 

If a business needs more in-depth support or advisory services, it can typically expect to pay more. On the other hand, a client that only needs basic bookkeeping services will likely pay lower fees. 

Common Pricing Models

CAS firms typically use 1 of 4 pricing models: 

• Fixed-fee pricing: Many CAS firms charge a set fee or bundle price. It’s useful for steady businesses but can be difficult to scale. 
• Value-based pricing: This is pricing based on the perceived value of the services being received. The greater the expertise or potential outcome, the higher the service fees. 
• Hourly billing: This is for firms charging by the hour. It’s less common these days since efficiency can mean fewer billable hours and lower revenues for CAS firms. 
• Subscription pricing: Some firms charge a monthly retainer fee, which covers predetermined deliverables. 

You might also find hybrid pricing models that combine multiple options. These allow for a bit more flexibility and can be tailored to client needs. 

Budgeting for CAS Over Time 

CAS is a recurring monthly cost, so plan for it the way you’d plan for rent or software. In other words, treat it as a fixed line item in the operating budget. 

While budgeting, consider whether your business is experiencing rapid growth or is relatively steady. If it’s the latter but you expect growth in the coming months or years, be prepared to scale up your CAS spending.  

The upside of common CAS pricing models is flexibility in both directions. A business can scale services back during a slow period or add advisory work when a bigger decision is on the table, like a fundraise or an acquisition. It’s worth regularly reviewing the scope with your firm, so the fees stay in sync with what the business needs. 

Tools and Practice Management

The quality of a client accounting services engagement depends on the tools behind it. Firms often rely on a specific stack to keep client work consistent and accurate at scale. That stack includes accounting software, practice management, and integrations.  

For anyone considering CAS from either side, knowing what those tools do is worth the time. 

Bookkeeping and Accounting Software 

The foundation is cloud accounting software. QuickBooks Online is a common choice for serving small and mid-sized businesses. It supports the day-to-day work, including tasks like: 

• Tax prep and filing support 
• Reports and insights 
• Automated bank feeds 
• Transaction categorization 
• Full-service payroll 
• Invoicing 

Workflow and Project Management

Accounting workflows are recurring and deadline-driven, and general-purpose project tools aren’t always built for them. Modern platforms like QuickBooks Online Accountant can help CAS teams: 

• Manage recurring projects and tasks 
• Assign work and monitor deadlines 
• Track client requests, document collection, and team workflows 
• Keep accounting and compliance work organized in 1 place 
• Track billable time when used with QuickBooks’ time-tracking capabilities 
• Automate routine accounting workflows, such as recurring tasks, document requests, and transaction management 

Using standardized templates or all-in-1 systems helps keep work consistent across clients and channels. 

Choosing Tools that Scale 

It’s OK to start small, but the right tools grow with your clients’ needs. Ideally, your firm will also be software-agnostic, meaning you can adapt to your clients’ existing stacks rather than requiring them to switch platforms. 

Whichever tools you choose, aim for integration across accounting, payroll, and reporting. That way, you can avoid manual workarounds and unnecessary delays. 

For more on tools and practice management, see Intuit’s top CAS resources. 

Getting Started With Client Accounting Services

Client accounting and advisory services is how many firms now work with small and mid-sized clients. The tier structure means a business can start with basic bookkeeping and add reporting, tax, and advisory support as needs grow. 

For firms, CAS is a fast-growing service line and a chance to move from transactional work to ongoing client relationships.  

Where to start depends on which side of the engagement you’re on. If you’re a small business owner considering CAS, look at your current accounting setup first. A firm that works in your existing system can onboard quickly and start delivering value right away. 

If you’re an accounting student or early-career accountant thinking about CAS as a career path, the skill set combines technical accounting fundamentals with business advisory work. Building comfort with the numbers and the client conversations can set you up well. 

For free financial and accounting education resources, explore Intuit for Education. If you’re an aspiring accountant looking for hands-on career development, learn about Intuit’s Accounting Futures program and client advisory services curriculum.

FAQs