How Much Does a CPA Cost for a Contractor Business?

CPA costs for contractor businesses generally fall into three tiers: $1,200–$4,000/year for tax preparation only, $4,000–$10,000/year for tax prep plus advisory, and $8,000–$18,000/year for full-service including monthly bookkeeping — with entity structure, revenue, and how much proactive planning is included driving where you land. Most contractors either overpay for a CPA relationship that delivers minimal advisory value, or underpay for a compliance-only service that leaves significant planning value on the table. Understanding what’s in each tier helps you evaluate whether your current arrangement is right.

What Are the CPA Cost Tiers for a Contractor Business?

Tier 1: Tax Preparation Only — $1,200 to $4,000/year

A CPA or enrolled agent prepares and files your returns. Nothing else.

For a sole-proprietor contractor on Schedule C, this means:

• Form 1040 with Schedule C: $1,200–$2,500
• State return: $200–$500

For a contractor S-corp:

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

What you get: Accurate filed returns. No planning, no proactive contact, no advisory.

Who this fits: Contractors generating under $100,000 in net income with simple structures and no significant assets or planning needs.

Who this does NOT fit: Any contractor with an S-corp, significant vehicle and equipment deductions, a retirement plan, or income above $100,000. The planning opportunities at that level far exceed the cost of a higher-tier engagement.

Tier 2: Tax Preparation + Advisory — $4,000 to $10,000/year

Mid-tier engagements include returns plus some level of advisory contact. But “advisory” varies significantly between firms:

Compliance-forward advisory ($3,500–$6,000/year): Returns plus one or two calls — typically in January when gathering documents and in October around estimated taxes. The CPA answers questions but doesn’t proactively surface issues. Most contractors in this tier are not getting retirement contribution recommendations, S-corp salary reviews, or year-end projections.

Genuine advisory ($6,000–$10,000/year): Quarterly engagement, proactive review of your financials, S-corp salary reviewed annually, year-end projection in Q4, retirement contribution recommendation before December 31, vehicle and equipment deduction review. You hear from your CPA between January and October — not just at filing time.

The diagnostic question: “Between January and October, how often will you initiate contact with me?” A compliance answer: “We’re available for questions.” An advisory answer names specific things they’ll reach out about and when.

Tier 3: Full-Service including Bookkeeping — $8,000 to $18,000/year

Some firms or platforms bundle monthly bookkeeping with CPA-level advisory and tax preparation into a single engagement.

The bookkeeping component for contractors includes: job cost tracking, accounts receivable management, subcontractor 1099 tracking, W-2 payroll reconciliation, monthly P&L and balance sheet, and bank reconciliations.

For contractors doing $500,000–$2,000,000 in annual revenue with 3–10 employees or regular subcontractors, the integrated model is often more cost-effective than separate bookkeeper + CPA relationships — and produces better outcomes because the bookkeeping is structured for tax strategy from the start.

What Drives CPA Cost for a Contractor Business?

S-corp vs. sole prop: S-corps require a separate return (Form 1120-S), which adds $1,200–$2,500 to preparation cost. The S-corp overhead typically pays for itself in tax savings at $100,000+ in net income.

Number of vehicles: Each vehicle with significant business use adds documentation work. If you have 3 vehicles, the deduction analysis takes longer and costs more than 1 vehicle.

Subcontractors and 1099s: If you have 10 regular subs who need 1099-NECs, that’s additional preparation work. Many firms charge $15–$30 per 1099. If you have 20 subs, add $300–$600 to your annual fee.

Job cost complexity: Contractors with complex job costing (multiple WIP projects, retainage tracking) have more complex books and consequently more complex returns.

State filings: Every state where you earn income may require a return. Multi-state contractors add $200–$600 per state per year.

Bookkeeping quality: Clean, monthly-closed books reduce the time a CPA spends organizing records. Contractors who bring a folder of receipts in February pay more in CPA time than contractors who deliver a clean QuickBooks file.

What Should You Be Getting for $5,000–$8,000 a Year in CPA Fees?

For a contractor paying $5,000–$8,000/year for a CPA relationship:

• Federal and state returns filed accurately and on time
• S-corp salary reviewed and documented annually
• Vehicle and equipment deductions correctly calculated and documented
• Quarterly estimated taxes calculated and communicated in advance
• Retirement contribution recommendation by October
• Year-end tax projection — not just at filing time
• At least one mid-year proactive contact to identify planning opportunities

If you’re paying $5,000–$8,000 and not getting the last three items, you have a compliance-forward relationship — returns are accurate, planning is absent.

How Do You Test Whether Your CPA Fees Are Delivering Value?

The question isn’t “is $7,000 a lot to pay a CPA?” The question is “what is my CPA’s planning delivering relative to what’s available?”

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

• S-corp salary optimization: saves $10,000–$18,000 in SE tax
• Solo 401(k) maximized: saves $12,000–$17,000 in income tax
• Vehicle deductions correctly structured: saves $3,000–$8,000
• QBI deduction correctly claimed: saves $5,000–$12,000

Total available planning savings: $30,000–$55,000/year. A CPA delivering that planning at $7,000–$10,000 is an excellent return. A CPA charging $3,500 but not surfacing any of those items is undercharging for compliance and overcharging for the value you’re actually receiving.

Bookkeeper vs. CPA for contractors — how the two functions divide and why you need both.

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