Can you get a rent receipt from landlord?
https://accountor.ca/blog/taxation/claiming-rent-on-taxes-and-rent-tax-return-in-canada.html
Claiming Rent on Taxes in Ontario
If you live in Ontario, you may be eligible for the Ontario Energy and Property Tax Credit (OEPTC), which is part of the Ontario Trillium Benefit (OTB). Using this tax credit is how to claim rent on taxes in Ontario.
This tax credit is based on your adjusted net family income and is reduced when your salary or wages exceeds certain amounts. You may qualify for the energy portion, the property tax portion, or both.
Though not explicitly claiming rent on taxes in Ontario as an expense, your rent paid throughout the year is one aspect used to help calculate this benefit.
Certain rules do apply to claiming rent on taxes in Ontario as part of the Ontario Trillium Benefit:
Rent payments that are not declared by your landlord on their income tax are not eligible
Only one spouse or common-law partner living together can apply for the OTB
You are eligible if you are sharing accommodations with roommates. You must only declare the rent you pay as your portion, but all roommates are eligible to apply.