Mandeep Dhesi, Broker and Team Lead | Aura Key Realty | RECO Registration #5016355
Last updated: July 16, 2026 | Brampton · Mississauga · Caledon · Vaughan · GTA
Quick Answer
The 15 most expensive mistakes first-time home buyers make in Ontario are: treating pre-approval as approval, getting only one mortgage quote, budgeting only for the down payment, using unseasoned down payment funds, skipping the FHSA, buying at maximum approval, budgeting only the mortgage payment, not having deposit funds liquid, skipping the home inspection, ignoring the neighbourhood, assuming pre-construction costs more than resale, signing a pre-construction agreement without capped adjustments, calling the listing agent directly, having no walk-away number, and changing your finances before closing.
Combined cost of these mistakes: typically $5,000 to $50,000 each. The most expensive one in 2026 — misunderstanding the new HST rebate on pre-construction — can cost over $100,000.
Key Numbers at a Glance (Ontario, July 2026)
| Item | Amount |
| Ontario Land Transfer Tax on an $800,000 home | $12,475 |
| Ontario first-time buyer LTT rebate (maximum) | $4,000 |
| Net LTT payable on $800,000 | $8,475 |
| Typical legal fees + title insurance + adjustments | $2,500–$4,000 |
| Recommended closing cost budget | 1.5% of price |
| FHSA annual contribution limit | $8,000 |
| FHSA lifetime limit | $40,000 |
| Federal FTHB GST Rebate (new homes ≤ $1M) | Up to $50,000 |
| Ontario enhanced HST relief (new homes ≤ $1M, APS Apr 1 2026 – Mar 31 2027) | Up to $130,000 |
| Old maximum HST rebate (APS before Apr 1, 2026) | $24,000 |
| Uncapped pre-construction adjustments, freehold townhome | $30,000–$60,000 |
| Down payment seasoning period lenders require | 90 days |
| Pre-construction cooling-off period (Ontario) | 10 days |
Mistake 1: Treating Pre-Approval Like Approval
Pre-approval is not approval. It is a lender’s estimate based on information you provided, not a commitment to fund.
Before your mortgage funds, the lender must still approve the property itself, review the appraisal, and re-verify that your financial position has not changed.
| What to do: Ask your lender one question before you write an offer — “Are all my documents verified, and is my rate held?”If either answer is no, you are not approved. You are browsing. |
Mistake 2: Getting a Mortgage Quote From Only One Lender
Your everyday bank is a starting point, not a decision. Interest rate is the least important part of a mortgage. The expensive terms are:
- Prepayment privileges — how much extra principal you can pay annually without penalty
- Break penalty — Interest Rate Differential (IRD) versus three months’ interest can differ by more than $20,000 on a five-year term
- Portability — whether you can transfer the mortgage to a new property mid-term
| What to do: Get three quotes minimum — one bank, one mortgage broker, one credit union. Compare the penalty clause, not the rate. |
Mistake 3: Saving Only for the Down Payment
Your down payment is not the cost of buying. Closing costs are separate, due on closing day, in certified funds.
Example — $800,000 home in Brampton or Mississauga:
- Ontario Land Transfer Tax: $12,475
- Ontario first-time buyer rebate: –$4,000
- Net land transfer tax: $8,475
- Legal fees, title insurance, tax adjustments: $2,500–$4,000
- Total: roughly $12,000, separate from your down payment
Note: Brampton, Mississauga, Caledon and Vaughan buyers pay only the provincial land transfer tax. Toronto buyers pay a municipal land transfer tax on top, roughly doubling this figure.
| What to do: Budget 1.5% of the purchase price for closing costs. Keep it in a separate account. |
Mistake 4: Down Payment Money That Isn’t “Seasoned”
Lenders must trace the source of your down payment — typically 90 days of bank statements. These get flagged and cause delays or dead deals:
- Cash from family with no paper trail
- Funds wired from overseas within 90 days of closing
- Cryptocurrency proceeds without exchange records
- Large e-transfers with no documented explanation
| What to do: Money sits in your Canadian account for 90 days before you offer. Gifts require a signed gift letter. Overseas transfers get documented at the source, not at closing. |
Mistake 5: Not Using the FHSA
The First Home Savings Account allows $8,000 per year, $40,000 lifetime. Contributions are tax-deductible going in, and withdrawals for a qualifying home purchase are tax-free coming out.
It is the only registered account in Canada that does both. If you are eligible and not contributing, you are choosing to pay more tax.
| What to do: Open an FHSA the moment you decide to buy, even if you contribute nothing at first — opening it starts the contribution room clock. |
Mistake 6: Buying at Your Maximum Approval Amount
The bank’s number is a lending limit, not a budget. Lenders do not model your family plans, your support obligations, or your savings goals.
| What to do: Decide your comfortable all-in monthly payment — mortgage, property tax, utilities, insurance, maintenance —before you look at a single listing. Work backwards to a purchase price. Give your agent that number and hold it. |
Mistake 7: Budgeting the Mortgage Payment Only
A $3,500 mortgage payment is not a $3,500 monthly housing cost.
Real cost on an $800,000 Brampton freehold home:
| Component | Monthly |
| Mortgage payment | ~$3,500 |
| Property tax | ~$400 |
| Home insurance | ~$120 |
| Hydro, gas, water | ~$300 |
| Maintenance reserve (1% of value annually) | ~$650 |
| Actual monthly cost | $4,300–$4,600 |
That $1,000 gap is the difference between comfortable and house-poor.
| What to do: Request the actual property tax bill and utility history before you offer. Budget 1% of the home’s value per year for maintenance. |
Mistake 8: Not Having Your Deposit Ready
A deposit is not a down payment. The deposit is due on the timeline written into your offer — commonly within 24 hours of acceptance, by bank draft or wire.
On an $800,000 home with a 5% deposit, that is $40,000, liquid, tomorrow.
If those funds are in a mutual fund, an RRSP, or an overseas account, you cannot deliver. Losing a deal after winning it is the worst possible outcome.
| What to do: Deposit funds sit liquid in a Canadian chequing account before you write your first offer. |
Mistake 9: Skipping the Home Inspection Because It “Looks New”
A showing shows you finishes. An inspector shows you the house.
At a recent inspection our team attended, the inspector identified a disconnected gas line plus damage across multiple areas of the property. None of it was visible during a normal showing. All of it would have become the buyer’s cost after closing.
An inspection will not find everything. It reliably covers roof, plumbing, electrical, HVAC and foundation — the five systems that fail in five figures.
Watch This Video to Understand the Pre-Delivery Inspection (PDI) Process
| What to do: If an inspection condition isn’t possible in a competitive offer, book a pre-offer inspection. $500 before, or$15,000 after. |
Mistake 10: Buying the House and Ignoring the Street
You can renovate a kitchen. You cannot relocate the house. What to check before offering:
- Commute at actual rush hour, not on a Sunday
- Zoning and approved development applications behind and around the property
- The street at 10pm, not just at 2pm
- School catchment, transit access, noise
| What to do: Visit twice — once in daylight, once after dark. |
Mistake 11: Assuming Pre-Construction Costs More Than Resale
| This is the most expensive assumption on this list in 2026, and the rebate landscape changed three times in the last twelve months. Most published guides are still quoting the old $24,000 figure. |
Buyers see a pre-construction townhome at $899,000 and a resale one at $859,000 and conclude pre-construction is more expensive. That is the wrong comparison — because it ignores tax relief that does not exist on resale at all.
What actually changed in 2026
The federal First-Time Home Buyers’ GST Rebate (Bill C-4) received Royal Assent on March 12, 2026, eliminating 100% of the federal GST on a new home valued up to $1 million, with a straight-line phase-out between $1 million and $1.5 million. The maximum is $50,000. It applies to agreements entered into with a builder on or after March 20, 2025 and before 2031.
Then Ontario went further. Ontario’s Bill 114 received Royal Assent on May 12, 2026, federal Bill C-26 followed on June 18, 2026, and Ontario Regulation 196/26 delivered the provincial 8% top-up on June 22, 2026 — with the combined relief in force retroactive to April 1, 2026. The result: up to $130,000, the full 13% HST, on a qualifying new home priced up to $1 million (approximately $50,000 federal plus $80,000 provincial). Unlike the first-time buyer rebate, this expanded Ontario relief is not limited to first-time buyers.
Refer : First Time Home Buyer Guide
The deadline that matters
Your Agreement of Purchase and Sale must be signed on or after April 1, 2026 and on or before March 31, 2027. That is the APS signing date — not your closing date, not your occupancy date, not the date you waived a condition. An agreement dated March 30, 2026 — by a single day — falls under the old rules, with a maximum rebate of $24,000.
| New home price | Maximum combined rebate |
| Up to $1,000,000 | Up to $130,000 (full 13% HST) |
| $1,000,000 – $1,500,000 | $130,000 maximum |
| $1,500,000 – $1,850,000 | Declines proportionally to $24,000 |
| Above $1,850,000 | $24,000 (existing maximum) |
| Important: These programs do not all automatically stack — some relief is calculated as the greater of two amounts rather than the sum. As of mid-2026, federal regulations and CRA rebate forms for the Ontario enhancement were still being finalized, so in many cases the rebate is claimed from the CRA after closing rather than credited by the builder. Confirm the mechanism with your builder and a tax professional before you sign. |
The rest of the comparison
| Factor | Pre-Construction | Resale |
| HST relief available | Up to $130,000 (in window) | $0 |
| Deposit structure | Staged over 12–24 months | 5% within 24 hours |
| Day-one renovation | $0 | Often $40,000+ kitchen, $12,000 roof by year 3 |
| Structural warranty | Tarion, 7 years | None |
| Price lock | Today’s price, close in 18–24 months | Today’s price, close in 60 days |
| What to do: Compare all-in cost over five years, not sticker versus sticker. Confirm your rebate eligibility and the APS window with a real estate lawyer before you sign — not after. |
Mistake 12: Signing a Pre-Construction Agreement Without Capping the Adjustments
Pre-construction has one serious trap, and this is it.
The builder’s price is not the builder’s price. Development charges, levies, meter and utility installations, Tarion enrolment fees and the builder’s lawyer’s admin fees are all added on closing day. In an uncapped agreement, these land between $30,000 and $60,000 on a freehold townhome. You discover the number three weeks before closing, with no leverage and no exit.
Capped, it’s a known figure. Uncapped, it’s whatever the municipality decides between signing and closing.
| What to do: During your 10-day cooling-off period, have a real estate lawyer: (1) cap development charges and levies in writing; (2) add or confirm an assignment clause; (3) confirm the deposit structure and dates; (4) confirm HST rebate assignment and eligibility language. That is what the 10 days are for. Most buyers spend them celebrating. |
Mistake 13: Calling the Listing Agent to “Cut Out the Middleman”
You believe you are saving commission. You are negotiating against a licensed professional whose legal fiduciary duty runs to the seller, with no one representing you.
In most GTA transactions the commission is paid by the seller regardless. You are not saving money. You are surrendering representation for free.
| What to do: Retain your own agent. It costs you nothing and it is the only person in the room obligated to your number. |
Mistake 14: Not Setting a Walk-Away Number
You will find a house you love, and your brain will start negotiating with you. “It’s only $20,000 more” becomes “that’s only
$120 a month” becomes “fine.”
$20,000 amortized over 25 years at 4.5% costs approximately $33,000 in total.
| What to do: Write your maximum on paper before offer night. Give it to your agent. The buyer who can walk away gets the better price. |
Mistake 15: Changing Your Finances Before Closing
This is the mistake that kills deals at the finish line.
Between offer acceptance and closing, your lender re-verifies employment, income and debt obligations before releasing funds. Any of the following can delay or void financing:
- Financing or leasing a vehicle
- Opening a new credit card or line of credit
- Buying furniture or appliances on a payment plan
- Changing jobs — including for higher pay
- Large unexplained deposits or withdrawals
| What to do: From accepted offer to keys, your financial life is frozen. Buy nothing, sign nothing, quit nothing. |
Frequently Asked Questions
What is the biggest mistake first-time home buyers make in Ontario?
How much are closing costs for a first-time home buyer in Ontario?
Is pre-construction cheaper than resale in Ontario in 2026?
How much is the HST rebate on a new home in Ontario?
$24,000.
Does the Ontario 2026 HST rebate only apply to first-time buyers?
How long does down payment money need to be in my account?
What is the difference between a deposit and a down payment?
Should I get a home inspection on a new-looking home?
Can I lose my mortgage after my offer is accepted?
What is the pre-construction cooling-off period in Ontario?
Get Your Numbers Before You Shop
Fourteen of these fifteen mistakes are free to avoid. The fifteenth just requires sitting still for 60 days.
If you’re buying your first home in Brampton, Mississauga, Caledon, Vaughan or anywhere in the GTA, contact Mandeep Dhesi at Aura Key Realty. We’ll build your complete cost picture — down payment, closing costs, deposit timing, HST rebate eligibility and your real monthly carrying cost — before you look at a single listing.
Sources
- Ontario: Calculating Land Transfer Tax
- Ontario: Land Transfer Tax Refunds for First-Time Homebuyers
- Canada Revenue Agency: First Home Savings Account (FHSA)
- Canada Revenue Agency: First-time home buyers' GST/HST rebate
- Canada Revenue Agency: Ontario enhanced new housing rebate
- Ontario: Condominium Act, 1998
- Tarion: How does deposit protection work on new homes?
This article is general information, not legal, tax or financial advice. HST rebate rules, thresholds and application processes are changing and CRA forms were still being finalized as of July 2026. Confirm your eligibility with a real estate lawyer and a tax professional before signing any agreement. Mandeep Dhesi, Broker, RECO Registration #5016355, Aura Key Realty.
