How Is Rent to a Family Member or Common-Law Partner Taxed?

There are several tax and family-law considerations for your client, Hans. Below I explain how the Canada Revenue Agency (CRA) generally treats contributions toward household costs, when rent is taxable, how rental expenses and losses are handled, and when common‑law status affects tax filings. This overview focuses on Canada (Ontario examples are noted) and is intended to clarify likely tax outcomes rather than provide formal tax advice.

Rental income

If a homeowner receives payments that qualify as rental income, those amounts must be reported on the personal tax return using Form T776, Statement of Real Estate Rentals. Allowable deductions against rental income include ordinary expenses you incur to earn that income. Typical deductible expenses include:

• Advertising
• Insurance
• Mortgage interest
• Legal and accounting fees
• Management fees
• Condo fees
• Repairs and maintenance
• Property taxes
• Utilities

Some expenditures that improve or extend the life of a property are capital expenses rather than repairs; those must be treated differently (capital cost allowance/depreciation) and are not fully deductible in the year they are incurred. Whether an expense is current or capital depends on its nature and purpose.

Rental losses

When deductible rental expenses exceed rental income, a net rental loss may result. Net rental losses can generally be applied against other sources of income in the same year, reducing taxable income and potentially producing tax savings. However, consistently reporting rental losses, especially if the rent charged is substantially below market rate, can attract scrutiny from the CRA. The agency may question whether the arrangement is truly an income‑producing rental activity or instead a personal cost‑sharing situation.

Renting below fair market value and cost‑sharing

Charging below‑market rent can be acceptable in some circumstances, for example where provincial rent control rules limit increases for long‑standing tenants. But if the lower amount is the result of a non‑arm’s‑length relationship (family members or close personal relationships), the CRA may treat the payments differently.

The CRA distinguishes between bona fide rental arrangements and simple cost‑sharing. If someone living in the home contributes a small amount toward household upkeep or groceries, the CRA considers that a cost‑sharing arrangement. In those cases, the homeowner does not report the contribution as rental income and cannot claim rental expenses or a rental loss for that dwelling. Based on the details you provided, your client’s girlfriend contributing $1,000 per month toward household costs appears consistent with a cost‑sharing arrangement rather than taxable rental income.

Practical indicators of a rental relationship

Factors that suggest a payment is rental income include a formal lease, a specified rent amount paid for exclusive use of space, the tenant paying separate utilities or damage deposits, and the landlord actively treating the arrangement as a business (advertising, formal recordkeeping). By contrast, casual contributions for shared household expenses, no exclusive use of premises, or informal arrangements with family or close friends point toward cost sharing.

Common‑law status and tax implications

You mentioned a three‑year time horizon for common‑law status in Ontario. That three‑year measure is a family‑law concept used to determine spousal support rights in the event of a breakdown of the relationship; exceptions can apply, for example if the couple has a child together. Family law varies by province and can create property and support obligations that differ from tax rules.

For tax purposes in Canada, the rule is different: a couple is considered common‑law for income‑tax purposes after living together in a conjugal relationship for 12 months, or sooner in certain circumstances (for example, if they have a child together). Once common‑law status applies, both partners must report the change on their tax returns. Common‑law status can affect eligibility for certain income‑tested credits and benefits and may allow partners to combine or allocate certain claims—medical expenses and charitable donations, for example—to maximize non‑refundable tax credits.

What your client should do

Given these distinctions, here are practical steps your client should consider:

• Keep clear records of all payments received and their purpose (e.g., labeled as household contribution versus rent).
• If you intend the arrangement to be a formal rental, use a written lease, track rent payments, and treat expenses consistently with a rental business (report income and claim allowable expenses on Form T776).
• If payments are simply cost sharing, document that they cover joint household costs to support the non‑rental characterization if the CRA asks.
• Consult a tax professional if you expect significant payments, plan to claim rental expenses, or if status change (becoming common‑law) is imminent—professional advice can help avoid mistakes and unnecessary audits.

Summary

Payments from someone living in the home can be either taxable rental income or non‑taxable cost sharing depending on the facts. Rental expenses are deductible only when incurred to earn rental income. A casual contribution toward groceries or household bills is typically treated as cost sharing and is not reported as rental income, nor does it justify claiming rental losses. Treat rentals to non‑arm’s‑length occupants with the same documentation and reporting you would use for unrelated tenants if you intend those payments to be rental income. When in doubt, keep records and consult a tax advisor to ensure correct filing and to understand how common‑law status may affect your client’s tax situation.