1 BioLab3 Ecology Concepts Lab report Student Name: Access Learning Systems 2 I. Pro
An invoice is a bill detailing services rendered or products purchased and their overall cost. As a legal document, an invoice can be used as evidence of an incurred debt. An invoice may cover the costs of newly purchased equipment.
Invoice is what one would bill for payment with. Voucher is an internal document or documents the Government uses as the evidence to pay a bill. You might try looking in your agencies finance regualtions, policies, handbooks etc. as I suspect 'voucher will be defined there somewhere.