You would claim the part of the expense you used during the year, and claim the rest when you use it in future years.

So do I found out how much that maintenance would have been if I didn't have prepaid maintenance and claim that amount?

The answer to this question would be best asked from the Canada Revenue Agency (CRA) at 1-800-959-8281. They will be able to clarify exactly how they like this to be claimed.

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