The best way of achieving more stable cashflow is to improve the way that you invoice your customer base.
For small businesses, any payment delay can cause serious trouble. Unfortunately, even large companies are always looking for ways to delay payment as long as possible.
Try to invoice customers immediately whenever possible. Many small business owners wait until the end of the week or month to do all their invoicing at once. This creates an even greater delay before you will receive payment. Get in the habit of always producing an invoice as soon as you finish a project or ship a product.
If you are working on large assignments for a client, try to divide the project into sections because this allows you to invoice as soon as each part is finished. This will help avoid cashflow problems you might face by not receiving any income until you complete a project, especially if you need to purchase materials or supplies. You will also be able to stop working if it becomes apparent that the client is unlikely to pay you.
Rather than sending a physical invoice, email invoicing is often a better option for small businesses. It is faster and much harder for your clients to ignore, although you could also send a physical invoice as a follow-up measure.