Their Details and Yours _ must be complete This is basic stuff, but you can't afford to forget it. In addition to the client's address, make sure to include the name of the client's contact person who handles your account! A company with three employees can figure out what you're doing; but in big companies, invoices get misplaced, especially if there's confusion over who belongs to which project. You'll also need your company name, your name, address, telephone number and email address. If they have any questions about the charges, contacting you should be as easy as possible.
Invoice example With GST & PST An invoice not only shows the customer or client how much money is due but provides tax information, in some countries multiple taxes may apply, for example in Canada it is required to put the Supplier's identification numbers for GST and QST taxes purposes. Whenever a taxable sale is made, the customer must be informed that GST and QST are added to the selling price. As there are no standard invoices required by law for this purpose, you must indicate the amount of the taxes on the cash register receipt; on the invoice or contract remitted to the customer. If you choose to indicate the GST and the QST, the amounts must be stated clearly.The European Union requires a VAT (value added tax) identification number on invoices between entities registered for VAT.