Applying for a home mortgage in Canada is one of the most significant financial steps you will ever take. Even a small misstep during the process can cost you thousands of dollars, delay your closing, or even result in a declined application. Here are the most common mistakes Canadian home buyers make — and how to avoid them.

1. Not Getting Pre-Approved Before You Shop

Many buyers start searching for homes before they know how much they can actually borrow. Without a mortgage pre-approval, you risk falling in love with a home that is outside your budget, or worse, making an offer and then being unable to secure financing.

A pre-approval locks in your interest rate for 90–120 days and shows sellers you are a serious buyer. In competitive GTA markets, this can make the difference between winning and losing a bidding situation.

2. Taking on New Debt Before Closing

One of the most damaging mistakes buyers make is taking on new debt — financing a car, opening a new credit card, or co-signing a loan — between mortgage approval and closing. Lenders do a final credit check before funding. Any new debt that increases your debt service ratios (GDS/TDS) can cause your approval to be rescinded at the last minute.

Rule of thumb: Do not make any significant financial changes between pre-approval and the day you receive your keys.

3. Changing Jobs or Going Self-Employed Mid-Process

Employment stability is a key factor lenders assess. If you change jobs — even to a higher-paying role — during the mortgage process, your application may need to be re-underwritten. If you transition from salaried employment to self-employment, many lenders will require two full years of self-employment income before they will consider your application.

If a career move is unavoidable, talk to your mortgage agent before making the change so you can plan around it.

4. Underestimating Closing Costs

Many first-time buyers in Ontario budget only for their down payment and are surprised by the additional costs at closing. These typically include:

• Ontario Land Transfer Tax (and Toronto Municipal Land Transfer Tax if buying in Toronto)
• Legal fees (typically $1,500–$2,500)
• Home inspection ($400–$600)
• Title insurance ($200–$400)
• CMHC mortgage insurance premium (if your down payment is less than 20%)
• Adjustment costs (prepaid property taxes or condo fees)

Budget for 1.5%–4% of the purchase price in closing costs on top of your down payment. First-time buyers in Ontario may be eligible for a Land Transfer Tax rebate of up to $4,000 — make sure your lawyer applies for it.

5. Only Speaking to Your Bank

Many Canadians go directly to their own bank when they need a mortgage, assuming that loyalty will get them the best rate. In reality, banks offer their own products only. A licensed mortgage agent has access to dozens of lenders — including banks, credit unions, trust companies, and alternative lenders — and can shop the market on your behalf to find the best rate and terms for your specific situation.

This matters especially if you are self-employed, new to Canada, or have had past credit challenges.

6. Focusing Only on the Interest Rate

The lowest rate is not always the best mortgage. A deeply discounted “no frills” mortgage may come with restrictive prepayment privileges, a large penalty for breaking the mortgage early, or a collateral charge that makes it difficult to switch lenders at renewal. Always look at the full cost of the mortgage, including:

• Prepayment options (can you pay 10–20% extra per year?)
• Portability (can you take the mortgage with you if you move?)
• Penalty structure (IRD vs. 3-month interest)

7. Skipping the Home Inspection

In hot markets, some buyers waive the home inspection to make their offer more competitive. While this can strengthen an offer, it carries real financial risk. Hidden issues like a failing roof, foundation problems, or outdated electrical can cost tens of thousands of dollars after closing.

If you must waive a formal inspection to compete, consider hiring an inspector for a quick pre-offer walkthrough instead.

8. Not Disclosing All Debts and Liabilities

Lenders pull your full credit bureau during underwriting. If you have debts you forgot to mention — a student loan, a car lease, a spousal support obligation — the lender will find them, and it can throw off your debt service ratios. Always be fully transparent with your mortgage agent so they can structure your application correctly from the start.

Work With an Experienced Mortgage Agent

Avoiding these mistakes starts with having the right guidance. As a Licensed Mortgage Agent Level 2 serving Toronto, Mississauga, and the Greater Toronto Area, I help buyers navigate every stage of the mortgage process — from pre-approval to closing — so nothing catches you off guard.

Book a free consultation to discuss your situation and get the process started on the right foot.