For accounting purposes, we need an invoice for accounts receivables, but when you get a payment from Apple for iAd revenue and app sales, how do you issue an invoice ?
Are there any specific regulations for this in Canada?
You won't issue invoices to Apple for your app revenue or iAd revenue. Rather, Apple will pay you (or your corporation, depending on your relationship with them) as part of an ongoing arrangement. The payment amounts are determined by Apple, not by you, since sales and ad revenue originate with Apple.
However, Apple must provide to you a statement of earnings / sales report with sufficient detail. Read your contract with Apple — you should find it says something to that effect.
In practical terms, you should be able to find what you need in iTunes Connect. Look under Payments and Financial Reports, then under the Earnings tab. Download & print whatever reports contain the relevant information about payments received, to support the deposits shown on your bank statements (which you'll recognize as revenue.)
As far as the Canada Revenue Agency is concerned, they want you to keep records and supporting documents, which can include invoices, as well as other kinds of documents:
Supporting documents include, but are not limited to the following:
- sales invoices;
- purchase receipts, contracts;
- bank deposit slips, cancelled cheques;
- cash register slips, credit card receipts; purchase orders;
- work orders;
- delivery slips;
- emails; and
- general correspondence in support of the transaction.
Disclaimer: I'm not an accountant, so consider talking to one. You could also call the CRA and ask.