Putting too much reliance on a single customer
You are more of an independent contractor than a business owner if a single customer accounts for more than half of your revenue. Diversifying your customer base is essential for company growth, but it may be tough, particularly when the client in issue pays well and on schedule. For many small companies, having a client who is prepared to pay on time for a product or service is a blessing.
Unfortunately, this might be a long-term disadvantage because, even if you have workers and so on, you may still be functioning as a subcontractor for a larger company. This arrangement helps the client to avoid the risks associated with expanding payroll in an area where activity may dry up at any time, and all of that risk is passed from the larger firm to you and your staff. If your major client has a regular demand for your product or service, this arrangement may work.
if your main client has a consistent need for your product or service.