1. Cash Flow Issues: Delayed invoicing can lead to cash flow problems, making it difficult to meet your own financial obligations. 2. Damaged Reputation: Clients may perceive delayed invoicing as unprofessional, which can harm your reputation and affect future business opportunities. 3. Increased Errors: The longer you wait to send an invoice, the more likely you are to forget important details, leading to potential disputes and delays in payment. 4. Strained Client Relationships: Inconsistent invoicing can lead to confusion and frustration for your clients, potentially damaging your business relationship.