Question 1

What client concentration percentage is considered risky?

Accepted Answer

Any single client above 30% of your total revenue is considered a yellow flag, and above 50% is a red flag. US tax courts have ruled freelancers with more than 70-80% of income from one client are effectively employees in disguise, risking IRS reclassification. The healthy target is no single client above 25-30% and at least 4-6 active clients per year. This spreads risk so that losing any single client costs you no more than a quarter of your revenue.

Question 2

What is the Herfindahl-Hirschman Index and why does it matter for freelancers?

Accepted Answer

The Herfindahl-Hirschman Index (HHI) is a mathematical measure of concentration used by the US Department of Justice for antitrust analysis and by investors for portfolio risk. For freelancers it translates directly: compute each client's share of your revenue, square each share, and add them up. HHI below 1,500 means you are well diversified. 1,500-2,500 is moderately concentrated. Above 2,500 is highly concentrated and risky. One client with 100% of revenue gives HHI = 10,000 (maximum risk). Ten equal clients give HHI = 1,000 (excellent diversification).

Question 3

Can I be reclassified as an employee by the IRS if I freelance for one big client?

Accepted Answer

Yes, it happens regularly. The IRS uses a 20-factor test that looks at control over work, financial arrangement, and type of relationship. High client concentration combined with long tenure and client-controlled working conditions is one of the strongest triggers. If reclassified, your client owes back payroll taxes and both of you may face penalties. You also lose your Schedule C deductions. To minimize risk, keep no single client above 30% of revenue, maintain multiple active clients, invoice by deliverable not hours, and work from your own equipment and office space.

Question 4

How do I reduce client concentration risk quickly?

Accepted Answer

Four proven tactics. First, raise your rates with smaller clients so they contribute more to the mix. Second, actively prospect for 2-3 new clients per quarter even when you are fully booked. Third, productize a service (a fixed-scope offering you can sell to multiple buyers) so each client engagement is smaller. Fourth, build a small retainer book of 3-5 clients at $500-2,000/month each for baseline income that makes the big client less critical. The fastest path is usually a combination of productization plus aggressive outbound prospecting over 2-3 quarters.

Question 5

Does this calculator count passing referrals through an agency as one client?

Accepted Answer

Yes. If an agency or staffing firm is your legal client (they invoice you, they pay you, they sign the contract), it counts as one client even if the work is for multiple end-customers. What matters for concentration risk is where your revenue comes from on paper. If the agency drops you, you lose that entire income stream regardless of how many end-customers were served. Track by invoicing entity, not by project.

Question 6

How often should I recalculate my concentration risk?

Accepted Answer

Quarterly at minimum, monthly if you are actively working to diversify. Pull rolling-12-month invoiced revenue per client (not just the current quarter, which can be distorted by billing timing). Set a target HHI of under 2,500 and a target top-client share under 30%. If either metric is trending the wrong way, make client acquisition your top priority until the metric recovers. Also recalculate before major financial commitments: mortgage applications, equipment loans, or hiring decisions, because your personal credit risk is tied to this portfolio risk.

Client Concentration Risk Calculator

What Is Client Concentration Risk?

The 30% Rule and IRS Reclassification Risk

How the Herfindahl-Hirschman Index Works

When to Use This Calculator