Same lender ratios, very different max purchase prices
Stress test on, 30-year amortization, 4.75% rate. Numbers indicative, not a quote.
| Scenario | Income | Down | Other debt | Max purchase | Typical FV product |
|---|---|---|---|---|---|
| Single first-time buyer | $90K | $50K | $150/mo (credit card) | ~$420K–$500K | Condo in Langley City, Surrey Whalley/Newton, Abbotsford East |
| Dual first-time couple | $160K combined | $90K | $450/mo (car) | ~$750K–$900K | Townhouse in Willoughby, Walnut Grove, Sardis, Cottonwood, Albion |
| Move-up couple | $200K combined | $300K (condo sale) | $600/mo (car) | ~$1.1M–$1.4M | Detached starter in Langley, Maple Ridge, Mission, larger Surrey townhouse |
The two definitions of "afford"
There is the lender's definition of affordability and there is yours. The lender's number comes out of a ratio test: housing costs as a percentage of gross income (the Gross Debt Service ratio, or GDS), and total debt payments as a percentage of gross income (the Total Debt Service ratio, or TDS). CMHC caps the insured-mortgage versions of these ratios at 39% GDS and 44% TDS for a buyer with a 600-plus credit score (CMHC GDS/TDS calculation guide).
Your definition of affordability is whatever lets you keep eating well, contributing to an RRSP, taking a real vacation once a year, and saving for the next thing. Those two definitions almost never match. We've watched too many first-time buyers stretch to the lender's ceiling and spend the next five years quietly broke. The calculator above gives you the lender's number. The rest of this page is about how to set your own.
The four numbers a lender plugs in
A mortgage broker or bank underwriter starts with four numbers and runs both ratios. The calculator above does the same thing in real time so you can stress-test scenarios.
- Qualifying income. T4 income at your current job. Both partners' if applicable. Self-employed income gets a haircut and a two-year look-back. Overtime and bonus pay need a two-year history before a lender will use it.
- Down payment. Every dollar of down payment moves the max-purchase number up by more than a dollar, because it reduces the loan amount and (above 20%) removes the CMHC insurance premium that would otherwise be added to the loan balance.
- Existing monthly debt service. Car loans, student loans, credit card minimums (lenders typically use 3% of balance), HELOC payments. Anything you'd still owe if you bought the house. These cut into your TDS room directly. Our debt impact calculator shows exactly how much.
- Property carrying costs. Property tax, half of any strata fee, and a standard heating cost are added to your housing line. The default heating figure most lenders use is around $100 per month for a typical Fraser Valley home, but the bigger input is the strata fee. Half of a $400 monthly strata reads as $200 against your qualifying income, which can shave 5% to 10% off your max purchase price on a condo.
The qualifying rate, not the contract rate
The interest rate the lender uses to approve you is not the rate you pay. Under OSFI Guideline B-20, every federally regulated lender qualifies borrowers at the higher of their contract rate plus 2% or the published qualifying rate of 5.25%, whichever is higher. The calculator above lets you toggle the stress test on so you can see both: the maximum purchase price the lender will approve, and the lower max you'd hit if your rate was the qualifying rate. The two numbers should look uncomfortably different. That gap is the whole point of the stress test.
Three buyer scenarios we see every week
The same lender ratios produce very different max purchase prices depending on income mix and existing debts. Three scenarios that match the FRIVE team's first-time and move-up buyers most weeks of the year:
Single first-time buyer, $90K income, $50K saved. One income, no partner income to lean on, and a credit card with a $5K balance. The TDS ceiling is usually what limits this buyer in the Fraser Valley, not the GDS. Even with no other debt, this profile typically lands in the $400K–$500K range, which means condos in Langley City, Surrey Whalley/Newton, or Abbotsford East. Townhouses are usually out of reach without family support or a co-buyer.
Dual first-time buyer couple, $160K combined, $90K saved. Two incomes, one car loan ($450/month), no credit card debt. This is the classic Fraser Valley first-time buyer profile. Max purchase typically lands somewhere between $750K and $900K depending on rate and amortization choice. That's three-bedroom townhouse territory in Willoughby Heights, Walnut Grove, Sardis, Cottonwood, or Albion. Many couples in this band can also stretch into entry-level detached in Abbotsford or Chilliwack.
Move-up couple, $200K combined, $300K equity from a condo sale. Two incomes, one car loan ($600/month), $150K mortgage paid down on a condo they're selling. The TDS room is usually wider here because the existing monthly housing cost goes away when the condo sells. Max purchase usually lands in the $1.1M to $1.4M range, which opens up detached starter homes in Langley, Maple Ridge, Mission, or larger Surrey townhouses.
The Fraser Valley reality check
Lender math says you can afford one number. The market often says something different. As of early 2026, a typical first-time buyer in Surrey, Langley, or Abbotsford is choosing between a $600K condo, a $750K to $900K townhouse, and a $1M-plus detached. The lender's ratios let many dual-income couples stretch to all three. The lived experience of carrying a $1.1M Langley detached on $160K combined income is rougher than the ratios suggest. Our recommendation: take the max purchase number the calculator produces, subtract $50K, and shop there. That's where the buyers we work with end up the happiest a year after closing.
What the 2026 first-time buyer programs add
For first-time buyers in BC, three programs stack with the lender's affordability math: the First Home Savings Account (deposit limit of $8,000 per year up to $40,000 lifetime), the RRSP Home Buyers' Plan (withdraw up to $60,000 from your RRSP for a down payment), and the BC first-time buyer Property Transfer Tax exemption (full exemption on the first $500,000 of fair market value when total price is $835,000 or less, with a phase-out to $860,000). The newest addition is the federal First-Time Home Buyers' GST/HST rebate, which received Royal Assent on March 12, 2026 and offers up to $50,000 back on GST paid for a newly built or substantially renovated home priced up to $1 million, with a phase-out to $1.5 million. None of these change your monthly mortgage payment; they all reduce the up-front cash you need at the notary, which means a bigger down payment is possible, which means the affordability calculator can produce a higher max purchase price.
How to use this calculator with a Fraser Valley listing
Three runs we usually do with a buyer. First, plug in your real numbers and read the max purchase price with the stress test on. Second, lower the rate by 0.5% and see what an ideal-market scenario produces. Third, raise existing debt by $300 to simulate a car purchase mid-process. The third run is the most useful for buyers planning to upgrade their car or take on debt before closing: in our experience, that single decision is the most common reason a pre-approval falls through. Book a 20-minute chat with the FRIVE team if you want a second opinion on what your specific numbers say.
Frequently asked questions
What's the difference between GDS and TDS?
GDS (Gross Debt Service ratio) is housing costs alone (mortgage payment, property tax, half of strata, and heating) divided by gross monthly income. TDS (Total Debt Service ratio) is GDS plus every other monthly debt payment. CMHC caps insured-mortgage applicants at 39% GDS and 44% TDS (CMHC official thresholds). Both ratios are run; whichever you hit first becomes your ceiling.
Does a higher credit score increase what I can afford?
Indirectly. CMHC accepts scores down to 600 for high-ratio insured mortgages, but lenders often want 680+ for their best rates, and some lenders require 720+ for the best uninsured rates. Lower rates mean lower monthly payments at the same purchase price, which lets you qualify for a slightly higher price. The calculator does not factor credit score directly; adjust the rate down if your credit is strong.
What if my income is irregular or commission-based?
Lenders typically use a two-year average for commission, bonus, and self-employed income. T4 base salary is used at face value. If you're newly self-employed or your income jumped recently, your qualifying income may be lower than you expect. A mortgage broker can pull the actual qualifying number from your last two T1 generals (Line 15000) before you start shopping.
How does my down payment change the max purchase?
Every extra dollar of down payment moves the max purchase up by roughly $1.20 to $1.30 depending on whether the loan is insured. Above 20%, you also remove the CMHC premium and gain access to the uninsured rate menu. The down payment calculator walks through the federal minimum tiers.
What if I'm self-employed?
Self-employed buyers typically need two years of T1 generals and Notice of Assessments, and lenders often use the lower of the two years or a discount on Line 15000. CMHC also offers a Self-Employed product with looser documentation but the premium is higher. Ask your broker about Alternative-A or stated-income programs if your tax returns understate your real cash flow.
Why does my pre-approval number differ from this calculator?
Pre-approvals factor in lender-specific overlays: minimum down payment rules for the property type, specific qualifying-income haircuts, regional adjustments, and the lender's view of your credit. The calculator uses the federal baseline (CMHC ratios, OSFI stress test) and is good for planning. A pre-approval is the lender's specific number for you on a specific day.
Do I qualify as a first-time home buyer?
The federal definition uses a four-year look-back. Neither you nor your spouse or common-law partner can have lived in a home either of you owned during the current calendar year or any of the four preceding years. That definition applies to the First-Time Home Buyers' GST/HST rebate, the RRSP Home Buyers' Plan, and the federal first-time buyer 30-year amortization. BC's Property Transfer Tax exemption uses a slightly different definition.
How much should I leave for closing costs?
Plan for 2% to 4% of the purchase price on top of the down payment. That covers BC Property Transfer Tax (if not exempt), legal fees, inspection, title insurance, strata documents (if applicable), and adjustments. The closing costs calculator breaks down each line.
Should I use a co-signer to qualify for more?
A co-signer (often a parent) takes on legal responsibility for the mortgage. It can lift the qualifying income meaningfully, but the co-signer's debt-to-income picture is now tied to your mortgage. We have hard conversations with parents who didn't realize the mortgage shows up on their credit. Useful tool. Real consequences for both sides.
What's the safest amount to actually buy?
Take the calculator's max purchase number with the stress test on. Subtract $50K. Shop in that band. In our experience, that's where the first-time buyers we work with feel solid a year later. Stretching to the ceiling almost always shows up as stress about smaller things: a broken appliance, a special levy, a job change.
Sources
- CMHC. Calculating GDS and TDS ratios. cmhc-schl.gc.ca
- OSFI Guideline B-20. Residential Mortgage Underwriting Practices and Procedures (stress test). osfi-bsif.gc.ca
- Canada Revenue Agency. First-Time Home Buyers' GST/HST rebate. Royal Assent March 12, 2026. canada.ca
- Government of BC. First-time home buyers' Property Transfer Tax exemption. gov.bc.ca
- FRIVE journal. How Much House Can You Afford in the Fraser Valley (2026). how-much-house-can-you-afford-fraser-valley-2026
