Hello, thank you for the question.
I'm not sure that I understand your question. You're away from your family home for 4 months and you have rented it out? And you want to know if you have to declare the rent as taxable income?
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Have you already rented out the home? Is there a lease? Do you know well the people staying there?
I see. How much money, approximately, do you think you'll earn from this? You'll have to assume that you're paying the utilities for the tenants.
Your tenants will want a receipt for rents paid so that they can get tax credit for it. You'll have to include it in your taxable income.
For only four months, I suspect that this isn't worth it to you. You'll need to make sure that your home complies with rental laws, including smoke/fire detectors, and perhaps a license depending on where you live.
You'll have to advise your insurance company and get additional insurance to guard against the damage which the renters might cause.
You can deduct from the income the expenses you've incurred but that will be little.
You're proposing to set up your home as a business, but only for four months. You'll be taking a lot of risks.
A better idea might be to have neighbours or a property management service check on the property regularly in your absence so that your home insurance policy remains in effect.
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If they pay by a cheque or be deposit to your account then they can still prove that they paid you and can claim it for the tax credit. If they claim it, and you don't claim rental income, there you're risking an audit by Canada Revenue Agency.
If you know and trust these people then this might work out. But you say that you don't, so I don't recommend that you take this risk just for a few months of rental income.
Anything else I can help with on this subject?