How Risky Is It If One Client Drives Most of Your Revenue?
A business where a single client makes up a large share of total revenue is exposed to a serious risk: if that relationship ends, revenue can drop sharply overnight. It also weakens your negotiating position — a large client who cuts an order or changes payment terms can disrupt your entire cash flow. This calculator takes your total annual revenue along with your largest and top-3 clients' revenue, and instantly shows your concentration ratios, a risk grade, and how much new revenue you'd need to bring your top client's share down to a safer level (commonly cited as 30% or below). It's a useful reference point when building out a new-business development plan.
Finding out your concentration is high doesn't mean you should cut ties with that client — it's a signal to build a contingency plan for if they ever leave, alongside a real target for landing new accounts. Recalculating this ratio every quarter is a simple habit that lets you check whether your diversification efforts are actually moving the number in the right direction.
Frequently Asked Questions
When a single client accounts for 30% or more of total revenue, your business becomes vulnerable if that relationship changes. 40-60% is generally considered high risk, and above 60% is considered severe risk.
It's risky from a revenue-stability standpoint, but it's often unavoidable in an early-stage business. What matters is recognizing the exposure and building a plan to win new accounts and diversify over time.
It isn't a legal requirement — it's a commonly cited rule of thumb in business finance and lending circles. The right target for your business depends on your industry and customer base.
※ Risk thresholds reflect common industry convention, not an absolute standard. This is an estimate for reference only.