# The 3-3-3 Rule for Buying a House: Does It Work in BC?

**Source:** https://soldbycraig.ca/blog/3-3-3-rule-buying-a-house-bc/
**Author:** Craig Johnston, REALTOR® (BCFSA Licence #187645) · Royal LePage Elite West

---

November 7, 2026 · For Buyers

# What Is the 3-3-3 Rule for Buying a House? And Does It Work in Coquitlam?

The 3-3-3 rule shows up all over social media as a quick test of whether you can afford a home. Here is what it actually says, why it comes in more than one version, and what happens when you run it against real Coquitlam prices and Canada's mortgage rules.

By **Craig Johnston, REALTOR® (BCFSA Licence #187645)** · 47+ year Tri-Cities resident · Helping Tri-Cities families move up

Royal LePage Elite West

Quick Answer

The most common version of the 3-3-3 rule (also called the 30/30/3 rule) says: **keep housing costs at or below 30% of your gross income, have 30% of the price saved, and buy a home worth no more than 3 times your gross annual income.** It is a rule of thumb from US personal-finance writing, not a Canadian lending rule. At September 2026 Coquitlam benchmark prices, the "3 times income" part would require about $213,000 of household income for a typical condo and about $326,000 for a typical townhome. Canadian lenders instead use debt-service ratios and the federal stress test. **Use the rule as a gut check, then get a written pre-approval for your real number.**

[Try the 3-3-3 calculator with your numbers ↓](#calculator)

**Up front:** Every dollar figure below is an illustration built from public benchmark prices and published lending rules, checked by calculation. It is not a mortgage quote, an approval or financial advice. Lenders apply their own policies, and your income, debts and credit change the answer. Confirm your numbers with a mortgage broker or lender. Craig Johnston is a REALTOR®, not a mortgage broker or financial advisor.

## What the 3-3-3 rule actually says

There is no official 3-3-3 rule. No regulator, lender or government publishes it. It is a budgeting shortcut that circulates on real estate blogs and social media, and it comes in at least two different versions.

**Version 1: the 30/30/3 rule.** This is the one most people mean. US real estate and banking sites describe it in three parts:

- **30% of income:** monthly housing costs (mortgage, property tax, insurance and any HOA or strata fee) at or below 30% of gross monthly income.

- **30% saved:** cash equal to 30% of the purchase price, meant to cover a 20% down payment plus about 10% for closing costs and an emergency buffer.

- **3 times income:** a purchase price no higher than 3 times gross annual household income.

**Version 2: the "three threes" of preparation.** Other writers use 3-3-3 to mean three months of living expenses in emergency savings, about three months of mortgage payments held in reserve, and looking at at least three properties before you decide.

Both versions point at a real risk: buying a home you can get approved for but can't comfortably carry. The trouble is that the numbers were built for markets where prices are much lower relative to incomes than they are in Metro Vancouver.

## Running the 30/30/3 rule on Coquitlam prices

Here is the rule applied to the Greater Vancouver REALTORS® MLS® Home Price Index benchmark prices for Coquitlam in September 2026. A benchmark is a "typical" home in the index, not an average sale or any specific listing; I explain how it works in [what the MLS® HPI benchmark price means](/blog/what-is-mls-hpi-benchmark-price-coquitlam-buyers-guide/).
| Coquitlam benchmark (Sept 2026) | Price | Income the "3×" rule needs | Cash the "30% saved" rule needs |
|---|---|---|---|
| Apartment (condo) | $640,100 | $213,367 | $192,030 |
| Townhouse | $976,600 | $325,533 | $292,980 |
| Detached | $1,584,400 | $528,133 | $475,320 |

Based on September 2026 benchmarks. Price ÷ 3 and price × 30%, rounded to the dollar.

Very few first-time buyers in the Tri-Cities, or anywhere in Metro Vancouver, would pass that test, and many people who buy here successfully don't. That doesn't mean they are being reckless. It means the 3× figure doesn't describe how Canadian lending works or what this market costs.

## How Canadian lenders actually decide what you can borrow

A Canadian lender doesn't multiply your income by three. It looks at two ratios and runs them at a stress-tested interest rate.

- **Gross Debt Service (GDS):** housing costs as a share of gross monthly income. CMHC's limit is 39%. Housing costs include mortgage principal and interest, property tax, heating, and strata fees (lenders commonly count half of the strata fee).

- **Total Debt Service (TDS):** housing costs plus every other debt payment (car loans and leases, credit cards, lines of credit). CMHC's limit is 44%.

- **The stress test:** for uninsured mortgages, OSFI's minimum qualifying rate is the greater of your contract rate plus 2% or 5.25%. Insured mortgages (less than 20% down) are qualified the same way. The ratios are calculated at that higher rate, even though you pay your actual contract rate.

The 39% ceiling on GDS is higher than the rule's 30%, and the stress test is stricter than it sounds. In my [stress test guide](/blog/mortgage-stress-test-coquitlam-buyers-2026/) I walk through why TDS, not GDS, is where most files actually get stuck.

Down payments work differently too. Canada's minimum is 5% on the first $500,000 and 10% on the portion above, up to $1,499,999. At $1.5 million and above, mortgage insurance isn't available and 20% is the minimum. The full tiers are in [how much down payment you need in BC](/blog/how-much-down-payment-do-you-need-bc-2026/).

## The same three homes, run the way a lender would

Here is a worked comparison for a buyer with no other debts, putting down the minimum, at the 4.44% lowest advertised 5-year fixed rate as of October 29, 2026 (Ratehub). The lowest advertised rates are often for insured mortgages. An uninsured mortgage, like the detached example, may be priced higher, which would raise the income needed.
|  | Condo $640,100 | Townhouse $976,600 | Detached $1,584,400 |
|---|---|---|---|
| Minimum down payment | $39,010 (6.1%) | $72,660 (7.4%) | $316,880 (20%) |
| Mortgage insurance premium (added to loan) | $24,044 (4.0%) | $36,158 (4.0%) | None (not insurable) |
| Mortgage amount | $625,134 | $940,098 | $1,267,520 |
| Monthly payment at 4.44% | $3,439 | $5,172 | $6,973 |
| Payment used for qualifying (6.44%) | $4,165 | $6,263 | $8,444 |
| GDS housing cost at the qualifying rate | $4,700 | $6,876 | $9,043 |
| **Household income to reach 39% GDS** | **$144,617** | **$211,579** | **$278,237** |
| Price as a multiple of that income | 4.4× | 4.6× | 5.7× |
| **Income to keep actual costs at 30%** | **$168,584** | **$239,815** | **$302,870** |

Based on September 2026 benchmarks. Illustrative only. 25-year amortization, Canadian semi-annual compounding, qualifying rate 4.44% + 2% = 6.44% (above the 5.25% floor). Property tax at Coquitlam's 2026 rate of $3.852 per $1,000 with assessed value assumed equal to price ($205, $313 and $509 a month). Heat $90 a month. Strata fees assumed at $480 (condo) and $420 (townhouse) a month, with half counted for GDS and all of it counted in the 30% row. Premium rate 4.0% for less than 10% down. The 30% row uses the actual 4.44% payment plus tax, heat and full strata, and leaves out insurance, utilities and maintenance.

Three things stand out. First, the lender's minimum income is well below what the 3× rule implies, because the rule assumes a much lower price-to-income ratio than Coquitlam has. Second, the "30% of income" part of the rule is actually stricter than the lender: keeping real carrying costs to 30% takes noticeably more income than qualifying does. Third, the detached column crosses $1.5 million, so the down payment jumps to 20% and the cash requirement changes completely.

That second point is the useful part of the rule. Being approved at 39% GDS means a lender will lend to you; it doesn't mean the payment leaves room for childcare, savings or a furnace replacement. I lay out every monthly line, including insurance, utilities and a maintenance reserve, in [what a Coquitlam home really costs each month](/monthly-cost-coquitlam-home/).

## What about "30% saved"?

The rule's 30% assumes a 20% down payment. Most first-time buyers in Canada put down less and pay a mortgage insurance premium instead. What you actually need in cash on closing day is the down payment plus closing costs, and closing costs are mostly BC Property Transfer Tax.
| Cash at closing (minimum down) | Condo $640,100 | Townhouse $976,600 | Detached $1,584,400 |
|---|---|---|---|
| Minimum down payment | $39,010 | $72,660 | $316,880 |
| Property Transfer Tax (standard) | $10,802 | $17,532 | $29,688 |
| PTT if eligible for the first-time buyer exemption | $2,802 | Not eligible (over $860,000) | Not eligible |
| **Subtotal before legal, inspection and adjustments** | **$49,812** ($41,812 with the exemption) | **$90,192** | **$346,568** |
| "30% saved" rule, for comparison | $192,030 | $292,980 | $475,320 |

Based on September 2026 benchmarks. PTT at BC's residential rates: 1% on the first $200,000 and 2% from $200,000 to $2 million. The first-time buyer exemption removes PTT on the first $500,000 (worth up to $8,000) on homes up to $835,000, with a partial exemption up to $860,000, if you meet the Province's eligibility rules. Legal, inspection, title insurance and adjustment costs are extra; see the closing costs guide.

So the 30% target is more than you strictly need to buy. But the minimum is also exactly that: a minimum. Buying with no cash left after closing is how the first year of ownership gets stressful. That is where the second version of the rule, the emergency and mortgage reserves, earns its place.

## Run the 3-3-3 rule on your own numbers

Enter your household income, the cash you have and a price you are considering. The calculator shows what the 3-3-3 rule says, what a Canadian lender's stress test is likely to allow, and what the home would actually cost you each month, then gives the price a green, yellow or red light. It uses the same assumptions as the tables above, and nothing you type leaves your browser.

## A BC version of the 3-3-3 check

If you like the idea of three simple tests, here is the version I find more useful for Tri-Cities buyers. It is a planning checklist to take into a conversation with your mortgage broker, not a lending rule or financial advice.

- **Three numbers from your lender, in writing.** A pre-approval for your maximum price at the stress-tested rate, the actual monthly payment at your contract rate, and the payment if your rate were 2% higher at renewal. The gap between "approved" and "comfortable" is your real budget. Here is [why a pre-approval beats a pre-qualification](/blog/pre-approval-vs-pre-qualification-coquitlam-buyers-2026/).

- **Three buckets of cash, kept separate.** Your down payment, your closing costs (CMHC suggests planning for 1.5% to 4% of the price; in BC most of it is PTT), and a reserve after closing. The second version of the 3-3-3 rule suggests about three months of living expenses plus three months of mortgage payments, which is a reasonable starting point to discuss with your advisor.

- **Three recent comparable sales.** Before you write an offer, look at at least three recent sales of genuinely similar homes nearby. The original rule's "look at three properties" is good advice, but comparing what similar homes actually sold for is what protects you from overpaying. I go through how in [how to tell if a Coquitlam home is overpriced](/blog/how-to-tell-if-a-coquitlam-home-is-overpriced/).

When I work with first-time buyers, the numbers come before the home tours, not after. I'll connect you with a Tri-Cities mortgage broker who can run your exact file, and I'll pull the comparable sales for any home you're serious about.

## Where the 3-3-3 rule is still worth listening to

- **If your price is above about 5 times your household income,** look hard at the monthly carry and your other goals, even if a lender says yes.

- **If your full monthly housing cost is above 30% of gross income,** make sure you're choosing that on purpose: for a better location, a school catchment or room to grow, and with a reserve behind it.

- **If closing would leave you with no savings,** slow down. A delayed purchase is cheaper than a forced sale.

Use the [3-3-3 calculator above](#calculator) to compare the rule with the stress test on your own numbers, or the [Coquitlam home affordability calculator](/coquitlam-home-affordability-calculator/) for a fuller lender-style estimate with every debt type, and see [how much home you can afford in Coquitlam](/how-much-home-can-you-afford-in-coquitlam/) for what different budgets buy.

## Frequently asked questions

### What is the 3-3-3 rule for buying a house?

It is an informal budgeting rule of thumb, not an official lending rule. The most common version, also called the 30/30/3 rule, says to keep housing costs at or below 30% of gross income, have 30% of the purchase price saved, and buy a home worth no more than 3 times your gross annual household income. Another version means three months of emergency savings, three months of mortgage payments in reserve, and viewing at least three properties.

### Is the 3-3-3 rule used by Canadian banks?

No. Canadian lenders use debt-service ratios instead. CMHC's limits are 39% for Gross Debt Service (housing costs) and 44% for Total Debt Service (housing plus other debts), calculated at the stress-test qualifying rate rather than your actual mortgage rate.

### How much income would the 3-times rule need for a Coquitlam condo?

Based on the September 2026 MLS® HPI benchmark of $640,100 for a Coquitlam apartment, the 3-times rule implies about $213,367 of gross household income. In this article's illustration, a buyer with no other debts, the minimum down payment and a 4.44% rate would reach the 39% GDS limit at about $144,617 of income.

### How much income do I need to buy a townhouse in Coquitlam?

In this article's illustration, a September 2026 benchmark Coquitlam townhouse at $976,600 with the minimum down payment, no other debts and a 4.44% contract rate (qualified at 6.44%) needs about $211,579 of household income to stay within 39% GDS. Keeping actual carrying costs at 30% of income would take about $239,815. Your own figure depends on your debts, down payment, strata fee and rate.

### Do I really need 30% of the price saved?

Not to buy. The 30% figure assumes a 20% down payment plus closing costs and a buffer. Canada allows as little as 5% down on the first $500,000 and 10% on the portion above, up to $1,499,999, with mortgage insurance. You do need the down payment plus closing costs in cash, and having savings left after closing is strongly worth planning for.

### What is the stress test rate in Canada?

For uninsured mortgages, OSFI's minimum qualifying rate is the greater of your contract rate plus 2% or 5.25%. Insured mortgages are qualified the same way. At a 4.44% contract rate, you would be qualified at 6.44%.

### Is spending more than 30% of income on housing a mistake?

Not automatically. Lenders allow up to 39% for housing costs at the stress-tested rate. But 30% is a sensible comfort check. If your full monthly carry goes above it, make sure that is a deliberate choice and that you still have an emergency reserve.

### What happens to the 3-3-3 rule at $1.5 million?

At $1,500,000 and above, mortgage default insurance is not available in Canada, so the minimum down payment becomes 20% of the full price. For a September 2026 benchmark Coquitlam detached home at $1,584,400, that is $316,880, before Property Transfer Tax of about $29,688 and other closing costs.

### Does the first-time buyer PTT exemption change the math?

It can. In BC, eligible first-time buyers pay no Property Transfer Tax on the first $500,000 of a home priced up to $835,000, worth up to $8,000, with a partial exemption up to $860,000. On a $640,100 condo that cuts PTT from $10,802 to $2,802. A home above $860,000 gets no exemption.

### What is a better rule than 3-3-3 for BC buyers?

One practical approach is to get three numbers in writing from your lender (maximum approval, your actual payment and the payment at a rate 2% higher), keep three separate buckets of cash (down payment, closing costs and a post-closing reserve), and compare at least three recent comparable sales before you offer. Treat it as a checklist for a conversation with your mortgage broker, not financial advice.

## Sources & Methodology

The rule's definitions come from the published articles below; it has no official source. Lending ratios and qualifying rates come from CMHC and OSFI, down payment and insured-mortgage limits from the Department of Finance, and PTT rules from the Province of BC. Prices are Greater Vancouver REALTORS® MLS® HPI benchmarks for Coquitlam, September 2026. All other figures are Craig Johnston's own illustrative arithmetic, checked by calculation.

- **Yavapai Realty — The 3-3-3 rule (30/30/3).** [yavapairealty.com/blog/3-3-3-rule](https://www.yavapairealty.com/blog/3-3-3-rule) — the 30/30/3 definition and the "three months / three months / three properties" variant. Checked October 31, 2026.

- **MIDFLORIDA Credit Union — What is the rule of 3 when buying a house?** [midflorida.com](https://midflorida.com/resources/insights-and-blogs/insights/mortgage/first-time-homebuyer/what-is-the-rule-of-3-when-buying-a-house) — the 30/30/3 rule as a readiness guideline. Checked October 31, 2026.

- **CMHC — Debt service calculator.** [cmhc-schl.gc.ca](https://www.cmhc-schl.gc.ca/en/finance-and-investing/mortgage-loan-insurance/homebuying-calculators/debt-service-calculator) — GDS limit 39%, TDS limit 44%, and what each includes. Checked October 31, 2026.

- **OSFI — Minimum qualifying rate for uninsured mortgages.** [osfi-bsif.gc.ca](https://www.osfi-bsif.gc.ca/en/supervision/financial-institutions/banks/minimum-qualifying-rate-uninsured-mortgages) — the greater of the contract rate plus 2% or 5.25%. Checked October 31, 2026.

- **Ratehub — Best 5-year fixed mortgage rates.** [ratehub.ca/best-mortgage-rates/5-year/fixed](https://www.ratehub.ca/best-mortgage-rates/5-year/fixed) — lowest advertised 5-year fixed rate, 4.44%, October 29, 2026.

- **CMHC — Mortgage loan insurance cost.** [cmhc-schl.gc.ca](https://www.cmhc-schl.gc.ca/consumers/home-buying/mortgage-loan-insurance-for-consumers/cmhc-mortgage-loan-insurance-cost) — premium rates; provincial sales tax on premiums applies only in Quebec, Ontario and Saskatchewan. Checked October 31, 2026.

- **Department of Finance Canada — Mortgage reforms (September 2024).** [canada.ca](https://www.canada.ca/en/department-finance/news/2024/09/government-announces-boldest-mortgage-reforms-in-decades-to-unlock-homeownership-for-more-canadians.html) — insured mortgage price cap raised to $1.5 million and 30-year amortizations for first-time buyers and new builds, effective December 15, 2024. Checked October 31, 2026.

- **Province of BC — First Time Home Buyers' Program.** [gov.bc.ca](https://www2.gov.bc.ca/gov/content/taxes/property-taxes/property-transfer-tax/exemptions/first-time-home-buyers) — exemption on the first $500,000 for homes up to $835,000, partial to $860,000, since April 1, 2024. Checked October 31, 2026.

- **Greater Vancouver REALTORS® — Coquitlam REALTOR® Report, September 2026.** MLS® HPI benchmark prices for Coquitlam apartments, townhouses and detached homes.

- **Craig Johnston, REALTOR® (BCFSA Licence #187645).** 47+ year Tri-Cities resident, Member of a Top 1% Team at Greater Vancouver REALTORS®, 2023–2025, working with first-time and move-up buyers across the Tri-Cities.

Methodology: payments use Canadian semi-annual compounding over 25 years at the 4.44% lowest advertised 5-year fixed rate as of October 29, 2026, and are qualified at 6.44%. Property tax uses Coquitlam's 2026 residential rate with assessed value set equal to price. Heat and strata fees are assumptions; use the Form B and real bills for any specific home. Last reviewed October 31, 2026. General information only; not mortgage, legal, tax or financial advice.

Signed: Craig Johnston, REALTOR® (BCFSA Licence #187645) · Royal LePage Elite West · Helping Tri-Cities families move up

## Want your real number, not a rule of thumb?

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## Related reading

- [Coquitlam home affordability calculator Your own numbers, stress-tested the way a lender does](https://soldbycraig.ca/coquitlam-home-affordability-calculator/)

- [What the stress test actually qualifies you for GDS, TDS and the qualifying rate, with Coquitlam examples](https://soldbycraig.ca/blog/mortgage-stress-test-coquitlam-buyers-2026/)

- [How much down payment you need in BC The 5%, 10% and 20% tiers and the $1.5 million line](https://soldbycraig.ca/blog/how-much-down-payment-do-you-need-bc-2026/)

- [What a Coquitlam home really costs each month Every line after the mortgage payment](https://soldbycraig.ca/monthly-cost-coquitlam-home/)

- [Coquitlam closing costs guide PTT, legal, adjustments and the first-time buyer exemption](https://soldbycraig.ca/coquitlam-closing-costs-guide/)

- [Coquitlam first-time buyer guide The full step-by-step from savings to keys](https://soldbycraig.ca/coquitlam-first-time-buyer-guide/)

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About the author

### [Craig Johnston, REALTOR®](/coquitlam-realtor-craig-johnston/)

47+ year Tri-Cities native, 9+ year Burke Mountain resident, Member of a Top 1% Team — Greater Vancouver REALTORS®, 2023–2025, Member of a Top 2% Team nationwide, 2023–2025 — Royal LePage, Member of a Medallion Club Team, 2021–2025, with Royal LePage Elite West. Helping Tri-Cities families move up. BCFSA Licence #187645, regulated by the BC Financial Services Authority (BCFSA).

Specializes in Coquitlam, Burke Mountain, Westwood Plateau, Heritage Mountain, Port Moody, Anmore acreage, and Belcarra Indian Arm waterfront. Move-up family representation, first-time buyer guidance, $2M+ luxury.

[Full bio + credentials →](/coquitlam-realtor-craig-johnston/)

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