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How do I claim HST compensation on my personal Ontario income taxes?
Your income and expenses for the business should be independent of HST. That is, if you charged somebody 100 + 13 HST, you have revenue of 100. You're going to send the 13 to the government later, it's not part of your revenue. If you go out and buy something for 10 + 1.30 HST, you record 10 as an expense. You're going to take the 1.3 off the 13 you would have sent the government, it's not part of your expenses. And so on.  I am not sure what you mean by "HST compensation" but if it came from the government, and it needs to be declared as income, there will be information to that end in the letter that comes with the cheque. (For example, if they pay you interest on your refund, the letter reminds you to include that money in next year's income.)