Bookkeeper vs. CPA for a Consulting Firm: Who Does What

A bookkeeper for a solo consulting firm typically costs $300–$800 a month, or $25–$75/hour independently. Consulting firm owners tend to hire either a bookkeeper or a CPA and assume that covers their financial operations — it covers half of them. Both functions serve distinct purposes, and the failure to have both typically costs more than the combined cost of each.

What Does a Bookkeeper Do for a Consulting Firm?

A bookkeeper’s job is to record and organize financial transactions. For a consulting firm, this means:

• Categorizing income and expenses in QuickBooks or equivalent
• Reconciling bank and credit card accounts monthly
• Tracking accounts receivable — who owes you and how old each invoice is
• Tracking accounts payable — what bills you owe
• Running payroll entries (recording salary payments from your S-corp)
• Generating monthly financial statements: P&L, balance sheet, cash flow statement
• Keeping the chart of accounts organized and current

A competent bookkeeper produces the financial records that tell you what your consulting firm did financially. They are not licensed professionals, they don’t prepare tax returns, they don’t give tax advice, and they don’t make strategic recommendations.

Cost: $300–$800/month for a virtual bookkeeping service. $25–$75/hour for an independent bookkeeper. More for firms specializing in professional services.

What they can’t do: File tax returns, give tax advice, optimize your S-corp salary, model retirement contributions, represent you in an IRS audit, or tell you whether your current entity structure is costing you money.

What Does a CPA Do for a Consulting Firm?

A CPA is a licensed professional responsible for tax compliance and strategic financial advisory. For a consulting firm, that means:

• Preparing and filing the S-corp return (Form 1120-S) and personal return (Form 1040 with K-1)
• Advising on entity structure (should you be an S-corp? When? With what salary?)
• Optimizing your annual S-corp salary across payroll tax, QBI, and retirement dimensions
• Advising on retirement plan options and calculating contribution amounts
• Calculating quarterly estimated taxes and building a payment schedule
• Year-end tax projections with specific planning options surfaced
• Representing you in IRS audits or correspondence
• Proactive planning throughout the year — not just at filing time

A CPA works from the financial records the bookkeeper produces. Clean, current books are the prerequisite for CPA advisory to be effective.

Cost: $2,000–$12,000/year depending on entity complexity and service level.

What they shouldn’t be doing: Monthly transaction categorization and bank reconciliation. When a CPA firm handles bookkeeping, you’re paying $200–$400/hour for tasks that a bookkeeper does for $50–$75/hour.

What Are the Three Most Common Mistakes Consulting Firm Owners Make?

Mistake 1: Using a CPA as a Bookkeeper

This happens when a consulting firm owner goes directly to a CPA firm without a bookkeeper. The CPA firm handles the books — usually through a junior associate — at CPA billing rates.

The result: an annual fee of $8,000–$15,000 for work that should cost $5,000–$8,000 at most (if bookkeeping and CPA were properly separated). The consulting firm owner gets clean books and a filed return, but almost no proactive planning — because the CPA is too busy on bookkeeping tasks to think about tax strategy.

Mistake 2: Having a Bookkeeper Without CPA Oversight

The opposite problem. The bookkeeper produces monthly financials, but nobody with tax expertise reviews them. The S-corp salary may be set incorrectly. The chart of accounts may not be aligned with tax return categories. The retirement plan may not be established. QBI optimization may be an afterthought at filing time.

The books are “clean” — accounts reconcile, transactions are categorized — but they’re not generating any planning intelligence. By April, the year is over and the window for most meaningful planning has closed.

Mistake 3: Neither — DIY Books, CPA at Filing

Solo consultants often maintain their own books in QuickBooks, hand everything to a CPA in February, and receive a return in April. This works acceptably for very simple structures at lower income levels.

Above $150,000 in net consulting income, the planning opportunities that exist throughout the year — salary adjustment, retirement contribution timing, QBI optimization, deduction capture — require a financial picture that exists year-round, not just at filing. The return is accurate; the planning is absent.

What Does the Right Bookkeeper-CPA Structure Look Like?

Bookkeeper: Closes the books by the 5th of each month. Produces P&L, balance sheet, AR aging. Flags any unusual items. Cost: $300–$600/month for a solo consulting firm.

CPA: Reviews the financials quarterly. Reviews S-corp salary in Q3, recommends adjustments if needed. Sends year-end tax projection in October. Recommends retirement contribution amount before December 31. Files returns. Cost: $4,000–$8,000/year.

The bookkeeper and CPA should communicate. The chart of accounts the bookkeeper maintains should be structured to produce the categories the CPA needs for the return. The CPA should review the chart of accounts at the start of the engagement and annually thereafter.

What Questions Should You Ask When Evaluating a Bookkeeper or CPA?

For a bookkeeper:

• Do you have experience with S-corp consulting firms?
• What software do you use, and how do you handle payroll entries?
• Do you track accounts receivable and produce an aging report?
• What is your monthly close turnaround time?

For a CPA:

• Do you specialize in or have significant experience with consulting firm owners?
• Between January and October — outside of filing season — what will I hear from you?
• Will you review my S-corp salary annually?
• How do you handle quarterly estimated tax projections?
• Will you proactively tell me about planning opportunities, or do I need to ask?

The last question for the CPA separates compliance-only from advisory relationships. A compliance answer: “We’re available for questions.” An advisory answer: “We reach out in Q3 specifically to review your numbers and flag anything before year-end.”

What Does an Integrated Bookkeeping-Plus-CPA Model Look Like?

The gap between a bookkeeper who closes the books and a CPA who shows up in April is where tax planning value lives. Integrated bookkeeping + advisory engagements close that gap — the bookkeeper and CPA are on the same team, the books are structured for tax strategy from the start, and the CPA engages monthly rather than annually.

For consulting firms at $200K–$800K in net income, the integrated model typically costs $8,000–$15,000/year and produces meaningfully better outcomes on tax minimization, cash flow visibility, and planning responsiveness than two separate relationships at the same combined cost.

The question isn’t bookkeeper or CPA. It’s whether you have both functions covered, coordinated, and pointed in the same direction.

See what a CPA engagement costs for a consulting firm for a full breakdown of pricing at each service tier.

This article is educational. Consult a licensed CPA for advice specific to your situation.