I have a number of maintenance contracts, some residential and some commercial, all of which are billed monthly. These are substantial accounts that require weekly or bi-weekly appearances for mowing on some or just weeding/deadheading & general bed maints. No problems here. I just recently picked up two accounts where I have been hired to plant a number of annual plantings for $xxx and maintain them through the summer for $xxx additional. They won't take a great deal of time and we aren't talking about a lot of money for the maint. and billing monthly seems quite unreasonable. When should I bill for the maint. portion. Should I bill the whole thing together, wait half way through the summer or wait till its all over? Is there an "industry standard" here? For what its worth, I have no doubts about whether the client will pay, regardless of when I bill.