How Much Does It Cost to Run a Consulting Business?

The Real Cost of Running a Consulting Practice

Consulting businesses are often started with the assumption that low overhead is guaranteed. In practice, overhead builds quickly once you factor in technology, marketing, professional services, taxes, and business administration.

Sustainable consulting businesses plan for costs before they become cash flow problems.

Startup Cost Breakdown

The Tax Cost Most Consultants Overlook

Self-employed individuals pay both the employee and employer share of Social Security and Medicare taxes — 15.3% on net profit before deductions. For a consultant earning $100,000 net, that is over $15,000 in self-employment taxes alone — before federal or state income taxes.

Estimated quarterly tax payments are required if you expect to owe $1,000 or more annually. Missing these creates penalties on top of the tax bill.

Software Expenses for Modern Consultants

• CRM and client management
• Project and task management
• Accounting and bookkeeping
• Video conferencing and communication
• Proposal and contract tools
• Scheduling and calendar management
• Cloud storage and file sharing

A fully equipped consultant typically budgets $300–$700 per month in software alone. Annual subscription reviews are important — unused tools remain active and billed.

Insurance and Professional Liability

Professional liability insurance (errors and omissions coverage) is often overlooked but critical for consultants. Depending on industry and contract scope, annual premiums range from $800 to $3,000 or more. General liability is often required for client contracts or office leasing.

Marketing and Business Development Costs

Many consultants launch without a formal marketing budget, relying on referrals. While referrals are valuable, sustainable growth typically requires dedicated marketing investment — digital presence, content, paid outreach, or networking. A reasonable starting range is 10–15% of revenue for service-based businesses in growth stages.

Contractor and Subcontractor Expenses

As workload grows, many consultants bring in subcontractors or specialists. Contractor expenses should be treated as a direct cost of revenue rather than overhead — but they must be tracked, documented, and properly reported on 1099-NEC forms at year-end.