I use Quicken/Quick Books for invoicing and a standard form with my letter head for field use. If I use a form in the field it's just to give the customer a receipt. I enter it into the computer at the end of the day.
For an invoice, I just use a generic NEBS form.
For service calls, I don't get a contract signed. Just issue a receipt/invoice when done, unless the "service call" really turns out to be a construction project. You get surprised sometimes when you show up at what the folks had in mind.
For a residential proposal/contract, I use another generic NEBS form.
For a comercial contract, I use a slightly modified version of this.
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