How Much Does a CPA Cost for a Consulting Firm?

A single-state, single-entity consulting S-corp typically pays $2,200–$4,500 a year for combined tax preparation alone, with the range rising to $4,000–$12,000 once advisory services are added. The cost of a CPA for a consulting firm depends almost entirely on what you need them to do — “getting a CPA” can mean anything from a $1,500 tax return to a $2,000/month advisory relationship. Understanding what’s in each service tier is necessary before you can evaluate whether a price is reasonable.

What Are the CPA Cost Tiers for a Consulting Firm?

Tier 1: Tax Preparation Only — $1,500 to $5,000/year

The bottom of the market: a CPA files your returns and does nothing else. For a solo consulting firm S-corp, this typically means:

• Form 1120-S (S-corp return) — $1,200–$2,500
• Form 1040 with Schedule E and K-1 — $800–$2,000
• State returns — $200–$500 each
• Combined for a single-state, single-entity consulting S-corp: $2,200–$4,500/year

Sole proprietors with no S-corp election pay less: a Schedule C adds $500–$1,000 to a personal return. Combined: $1,500–$2,500/year.

What you get: An accurate, filed return. Nothing else. No proactive advice, no mid-year contact, no review of your estimated payments, no guidance on retirement contributions or salary optimization.

Who this fits: Consulting firms generating under $100,000 in annual net income with simple structures. Once you’re above that threshold, the tax savings from proactive planning routinely exceed the cost of the next tier.

Tier 2: Tax Preparation + Advisory — $4,000 to $12,000/year

Mid-tier engagements include the returns plus some level of proactive advisory contact. What “advisory” actually means varies significantly between firms:

Compliance-forward advisory: Returns plus one or two calls per year — typically before year-end and around estimated tax payments. The CPA responds to your questions but doesn’t proactively surface issues. Fee range: $3,000–$7,000/year.

Genuine advisory: Quarterly touchpoints, proactive review of your financials, salary optimization analysis, retirement contribution recommendations, year-end tax projections with planning options presented, and audit support if needed. Fee range: $6,000–$12,000/year.

The gap between these two is significant. Most consulting firm owners in the $200,000–$500,000 net income range who are paying $4,000–$6,000 for “tax and advisory” are getting compliance-forward service — returns plus reactive Q&A — not proactive planning.

The tell: if your CPA doesn’t reach out between January and October of their own accord, you have a compliance-forward relationship regardless of what the engagement letter says.

Tier 3: CFO-Level / Fractional Controller — $1,500 to $5,000/month

For consulting firms growing rapidly, managing multiple entities, or requiring real-time financial oversight, ongoing fractional CFO or controller services include:

• Monthly financial reporting and analysis
• Ongoing cash flow management
• Budget vs. actual variance analysis
• Capital allocation support
• Entity structure management as the firm scales
• Banking relationships and credit facility management

This tier is appropriate for consulting firms above $2M in annual revenue with employees and operational complexity that justifies a dedicated financial management function.

What Variables Drive Up CPA Cost for a Consulting Firm?

Entity complexity: A sole prop is simpler than an S-corp. An S-corp that also has a separate LLC holding an asset is more complex. Each additional entity adds $800–$2,000 to annual CPA fees.

State filing requirements: Every state where you earn income may require a state tax filing. Each state return adds $200–$600. A consultant working with clients in five states could add $1,000–$3,000 in state return preparation alone.

Bookkeeping quality: A CPA working from well-organized monthly books charges less than a CPA who has to reconstruct your financial records from bank statements in February. Messy books that require cleanup at tax time add $1,000–$3,000 to a typical engagement.

Payroll complexity: If you run payroll through your S-corp (which you must), a CPA who also manages payroll charges for it. Alternatively, you use a payroll service (Gusto, ADP) and your CPA just reviews the entries — which is usually less expensive.

Specialty knowledge: A CPA who specializes in consulting firm owners and understands S-corp salary optimization, QBI analysis, and consulting-specific deductions charges more than a generalist — and typically delivers meaningfully better outcomes. The premium is usually $500–$2,000/year; the tax savings from correct planning routinely exceed that difference.

What Should You Be Getting for Your Money?

At $4,000–$8,000/year for a consulting firm CPA relationship, you should receive:

• Accurate, timely federal and state returns
• S-corp salary reviewed and set correctly before year-end
• Quarterly estimated tax amounts calculated and communicated (not just “use prior-year safe harbor”)
• Retirement contribution recommendation made by October
• Year-end tax projection sent to you in Q4 — not at filing time
• At minimum one proactive mid-year contact where the CPA reviews your numbers and identifies planning opportunities

If you’re not getting the last three items, you’re paying for compliance and getting filed-but-not-planned taxes.

What Don’t CPAs Typically Include?

Bookkeeping: Most CPA firms quote tax preparation fees separately from bookkeeping. If you don’t have a bookkeeper, ask whether your CPA offers it or refers it — and be aware that many CPA firms charge $150–$300/hour for bookkeeping work that a dedicated bookkeeper would do for $50–$75/hour.

Payroll: Usually handled through a payroll provider (Gusto, ADP) that you pay directly, not through your CPA.

Business formation: Usually billed separately, typically $500–$2,000 depending on state and complexity.

Audit representation: Usually not included in base fees. If you’re audited, representation time is typically billed at $300–$500/hour.

Is Your Current CPA Delivering Value?

The right question is not “is $8,000/year too much for a CPA?” It’s “what is my CPA’s planning delivering relative to what a different approach would produce?”

For a consulting firm at $250,000 in annual net income:

• Correct S-corp salary: saves $8,000–$12,000/year in SE tax
• Maximized Solo 401(k): saves $10,000–$18,000 in income tax
• QBI analysis and optimization: potentially saves $5,000–$15,000 in income tax
• Home office and health insurance correctly structured: saves $2,000–$5,000

Total annual tax savings from correct planning: $25,000–$50,000. A CPA charging $6,000–$10,000 for the above is a very good return on investment. A CPA charging $3,000 but not surfacing any of those items is a poor return — you’re paying $3,000 for an accurate filing and leaving $25,000–$50,000 in planning value on the table.

Bookkeeper vs. CPA for a consulting firm covers how the two functions should work together and what questions to ask to evaluate each.

This article is educational. RTW.ai publishes its prices at rtwadvisors.ai/pricing. Consult a licensed CPA for advice specific to your situation.