You submitted your mortgage application. Now what? Behind the scenes, a mortgage underwriter is reviewing every detail of your financial life and the property you want to buy. The underwriting process determines whether your mortgage is approved, approved with conditions, or declined. Understanding this process helps you avoid delays and surprises.
The Mortgage Underwriting Timeline
| Stage | What Happens | Typical Timeline |
|---|---|---|
| 1. Application submitted | Mortgage broker or bank submits your file to the lender | Day 0 |
| 2. Initial file review | Underwriter confirms all required documents are included | Day 1–2 |
| 3. Income verification | Employment confirmed; income documents reviewed against application | Day 2–5 |
| 4. Credit assessment | Full credit bureau pull; analysis of score, history, and outstanding debts | Day 2–3 |
| 5. Property appraisal ordered | Lender orders appraisal to confirm property value | Day 2–5 |
| 6. Appraisal completed | Appraiser visits property and submits report to lender | Day 5–10 |
| 7. Debt ratio calculation | GDS and TDS calculated using qualifying rate (stress test) | Day 5–7 |
| 8. Down payment verification | Source of funds confirmed (bank statements, gift letter, RRSP, FHSA) | Day 5–7 |
| 9. Default insurance (if applicable) | File sent to CMHC, Sagen, or Canada Guaranty for approval | Day 6–10 |
| 10. Final decision | Approved, approved with conditions, or declined | Day 7–14 |
| 11. Commitment letter issued | Formal mortgage approval with all terms and conditions | Day 7–14 |
| 12. Conditions fulfilled | Borrower satisfies any remaining conditions (e.g., provide updated documents) | Before closing |
What the Underwriter Evaluates
Income Verification
| Income Type | What’s Required | How It’s Verified |
|---|---|---|
| Salaried employee | Letter of employment, recent pay stub, T4, Notice of Assessment (NOA) | Underwriter calls employer to confirm employment is active |
| Hourly / part-time | Same as salaried + 2-year history of consistent hours | Average of 2 years of T4 income; NOAs confirm |
| Self-employed (sole prop) | 2 years of T1 Generals, financial statements, NOAs, business licence | 2-year average of net income (line 15000) used for qualifying |
| Self-employed (incorporated) | 2 years T2 corporate returns, T4/T5 slips, NOAs, articles of incorporation | Salary + dividends from corporate returns; retained earnings may be considered |
| Commission income | 2 years of T1 Generals, T4s showing commission, employer confirmation | 2-year average; must show stability or growth |
| Rental income | Lease agreements, T776 (Statement of Real Estate Rentals), NOA | Lenders use 50–80% of gross rental income for qualifying |
| Pension / government benefits | Pension statement, CPP/OAS statement, T4A(OAS), T4A(P) | Confirmed via NOA; considered stable income |
| Child support / alimony | Court order or separation agreement, proof of consistent receipt | Must show 12+ months of consistent receipt via bank statements |
| Investment income | T3/T5 slips, portfolio statements, NOA | 2-year average; must be consistent |
Credit Assessment
| Factor | What Underwriters Look For | Impact |
|---|---|---|
| Credit score | Minimum 600–680 depending on lender; insured mortgages typically require 680+ | Below threshold = decline or higher rate |
| Payment history | Late payments, collections, judgments, consumer proposals, bankruptcy | Any delinquency in last 12 months is a red flag |
| Credit utilization | How much of available credit is being used | Over 75% utilization = concern |
| Length of credit history | How long accounts have been open | At least 2 active trade lines open for 2+ years |
| Recent inquiries | Multiple hard pulls in a short period | Mortgage-related pulls within 14 days count as one |
| Outstanding debts | Credit cards, car loans, student loans, lines of credit | All minimum payments included in TDS calculation |
Property Assessment (Appraisal)
| Appraisal Component | What’s Evaluated |
|---|---|
| Market value | Comparable sales analysis (3–5 recent sales of similar properties nearby) |
| Property condition | Structural integrity, health and safety hazards, major needed repairs |
| Location | Neighbourhood, marketability, proximity to amenities, urban/suburban/rural |
| Property type | Detached, semi, townhome, condo — each has different lending criteria |
| Zoning and legal use | Confirms the property is residential; identifies illegal units or non-conforming uses |
| Environmental risks | Flood zone, proximity to gas stations, dry cleaners, or other contamination sources |
| Appraisal Outcome | What Happens |
|---|---|
| Appraised at or above purchase price | Proceeds normally; no issue |
| Appraised below purchase price | Lender bases mortgage on the lower appraised value; you must cover the shortfall with additional cash or renegotiate the price |
| Appraisal identifies condition issues | Lender may require repairs before closing or holdback funds until repairs are completed |
| Property doesn’t meet insurer guidelines | CMHC / Sagen / Canada Guaranty may decline the file (e.g., certain condo projects, rural properties, mixed-use) |
Debt Service Ratios
| Ratio | Formula | Maximum |
|---|---|---|
| GDS (Gross Debt Service) | (Mortgage payment + property tax + heating + 50% condo fees) ÷ Gross income | 39% (some lenders allow 44% for strong files) |
| TDS (Total Debt Service) | GDS costs + all other debt payments (car loan, credit cards, student loans, LOC) ÷ Gross income | 44% (some lenders allow 49% for strong files) |
Important: All ratios use the stress test qualifying rate — the higher of the Bank of Canada benchmark rate or your contract rate + 2%. As of 2026, the qualifying rate is typically 1.5–2% higher than what you actually pay.
| Example | Calculation |
|---|---|
| Gross household income | $120,000/year = $10,000/month |
| Mortgage payment (at qualifying rate) | $2,400/month |
| Property tax | $400/month |
| Heating | $150/month |
| Condo fees (50%) | $250/month |
| GDS | ($2,400 + $400 + $150 + $250) ÷ $10,000 = 32% ✅ |
| Car loan payment | $450/month |
| Credit card minimum | $100/month |
| TDS | ($3,200 + $450 + $100) ÷ $10,000 = 37.5% ✅ |
Down Payment Verification
| Source | Documentation Required | Notes |
|---|---|---|
| Personal savings | 90 days of bank statements showing accumulation | Must show the money is yours; no unexplained large deposits |
| Gift from immediate family | Gift letter + donor’s bank statement showing transfer | Must be a true gift, not a loan; family member must confirm in writing |
| RRSP (Home Buyers’ Plan) | RRSP statements, HBP withdrawal confirmation | Max $60,000 per person; must be first-time buyer or qualifying again |
| FHSA withdrawal | FHSA account statements | Max contribution $8,000/year, $40,000 lifetime; must be first-time buyer |
| Sale of existing property | Signed APS for sale, MLS listing, or closing statement | Net proceeds used; bridge financing if sale closes after purchase |
| Equity from another property | Recent appraisal, mortgage statement | HELOC or refinance proceeds |
| Non-traditional sources | Varies by lender | Borrowed down payment (e.g., LOC) — included as debt in TDS; some lenders don’t allow |
Anti-money laundering note: Lenders must comply with FINTRAC regulations. All down payment funds must have a clear, documented trail. Large cash deposits or transfers from unknown third parties will be flagged and may delay or prevent approval.
Default Insurance Underwriting
If your down payment is less than 20%, your mortgage must be default-insured through CMHC, Sagen, or Canada Guaranty. The insurer conducts its own underwriting review.
| Insurer Requirement | Details |
|---|---|
| Minimum credit score | Typically 680+ (one applicant); some flexibility for co-borrowers |
| Maximum purchase price | $1,499,999 (insured mortgages not available at $1.5M+) |
| Maximum amortization | 25 years (standard); 30 years for first-time buyers on new builds |
| Maximum GDS / TDS | 39% / 44% (stricter than some lenders) |
| Property requirements | Must be owner-occupied; no investment properties; maximum 4 units |
| Insurance premium | 1.7%–4.0% of mortgage amount, added to the mortgage |
Approved with Conditions
Most approvals come with conditions that must be satisfied before the lender funds the mortgage.
| Common Condition | What You Need to Provide |
|---|---|
| Updated employment letter | Dated within 30 days of closing; confirms active employment |
| Proof of down payment | Bank statement showing funds available for closing |
| Property insurance | Confirmation of home insurance with lender named as loss payee |
| Lawyer’s contact information | Name and contact for your real estate lawyer |
| Signed commitment letter | You sign and return the lender’s formal mortgage offer |
| Explanation letter | If there are credit issues, gaps in employment, or large deposits — a written explanation |
| Updated credit check | Lender may re-pull credit before closing to confirm no new debts |
| Title insurance | Arranged through your lawyer; protects lender against title defects |
Common Reasons for Decline
| Reason | What Went Wrong | How to Prevent |
|---|---|---|
| GDS / TDS over limits | Too much debt relative to income | Pay down debts before applying; avoid new credit |
| Credit score too low | Below lender or insurer minimum | Check your score before applying; dispute errors; build credit for 6+ months |
| Income not verifiable | Stated income doesn’t match documents | Ensure all income is reported on tax returns; provide complete documentation |
| Property appraisal low | Home appraised below purchase price | Research comparable sales before bidding; negotiate price down if low appraisal |
| Property doesn’t qualify | Condo fails insurer review, rural property, condition issues | Research property eligibility before making an offer |
| Down payment source unclear | Cannot document the source of funds | Keep 90 days of bank statements; document all transfers |
| Employment changed | Job loss or change between pre-approval and closing | Do not change jobs during the mortgage process |
| New debt taken on | Bought a car or opened new credit after pre-approval | Do not take on any new debt between pre-approval and closing |
How to Speed Up Underwriting
| Action | Why It Helps |
|---|---|
| Provide all documents upfront | Incomplete files sit in a queue; complete files get processed faster |
| Respond to conditions quickly | Every day you delay extends the timeline |
| Get a pre-approval first | Pre-approval means the lender has already reviewed your credit and income |
| Use a mortgage broker | Brokers submit to lenders that are best fit for your profile — fewer declines, faster processing |
| Keep your financial situation stable | No new debts, no job changes, no large purchases |
| Have your lawyer and insurance ready | Lender conditions include both — have them staged before the commitment letter arrives |
The Commitment Letter
The commitment letter (also called a mortgage approval letter or formal approval) is the final document confirming your mortgage.
| Component | What It Contains |
|---|---|
| Mortgage amount | The approved loan amount |
| Interest rate | Your contracted rate (locked in from rate hold or new quote) |
| Term | Length of the mortgage term (typically 5 years) |
| Amortization | Repayment period (25 or 30 years) |
| Payment frequency and amount | Monthly, bi-weekly, or accelerated bi-weekly — and exact payment |
| Prepayment privileges | How much extra you can pay per year without penalty |
| Conditions to fund | Any remaining items you must provide before closing |
| Expiry date | The commitment letter is valid until this date |
| Penalty terms | Early termination costs (IRD or 3-months’ interest) |
From Commitment to Closing
| Step | Who Does It | When |
|---|---|---|
| Sign and return commitment letter | You | Within 1–3 days of receiving it |
| Satisfy remaining conditions | You | Before closing |
| Lender sends mortgage instructions to lawyer | Lender | 5–10 days before closing |
| Lawyer prepares documents | Your lawyer | 3–5 days before closing |
| You sign mortgage documents | You + lawyer | 1–5 days before closing |
| Lender funds the mortgage | Lender → lawyer’s trust account | Closing day |
| Lawyer registers title transfer | Lawyer | Closing day |
| You receive the keys | Real estate agent or lawyer | Closing day |