End of month statements simply sum up what the customer owes. This extra administrative step costs time and money, so why not eliminate it if possible?
You can do this in many cases by stating at the bottom of all your invoices in bold: 'Please pay on this invoice as no statement will be sent'.
Some customers - again, typically larger ones who receive multiple invoices from you - will insist on end of month statements, but many others will happily pay against an invoice. More importantly, you'll get your money more quickly as people won't be waiting for a statement to arrive.
If you do have to send statements, avoid the layout common to many statements that shows how long payments have been outstanding: 30 days - 60 days - 90 days - Total.
This layout simply encourages habitually tardy payers by signaling that you are prepared to wait up to 90 days for payment - after all, it's on the statement! Remember that some businesses will be only too happy to use your business as a free source of finance if they feel they can get away with it.
Don't give them any encouragement in this regard whatsoever. A better layout omits the time spans, for example:
Current - Overdue - Total
If necessary, you can point out by how long the amount is overdue when you follow up such an overdue account.