Bill before the 'moneymoon' is over.
The Urban Dictionary's Word of the Day today is Moneymoon, defined as:
The time after your purchase of a good or service and before 'buyer's remorse' happens. "The moneymoon is over, I realzie now that buying that boat was a waste of money."
Made me think of the number one rule of small business cash flow: Bill your clients before the moneymoon is over.