# What documentation is necessary for a mortgage application?

> Comprehensive loan documentation ensures transparency and accountability during mortgage approval.

Category: Investor
Last verified: 2026-02-18
Source: https://ratellow.com/faqs/investor/what-documentation-is-necessary-for-a-mortgage-application

## Answer
If an independent third-party reviews a mortgage loan file, they should be able to replicate the underwriting criteria and arrive at the same credit decision based on the documented evidence. Below are common documentation requests:

| Document Type | Description |
|---|---| 
| Loan Purpose | An outline of the loan's intended use. | 
| Income Verification | Proof of employment status and income details. | 
| Debt Service Ratios | Calculations of debt service ratios, validating heating costs, taxes, and other debt obligations. | 
| LTV Ratio | The loan-to-value ratio, property valuation, and associated appraisal documents. | 
| Credit Enquiries | Credit bureau reports and records of any other credit inquiries. | 
| Down Payment Source | Evidence confirming the origin of the down payment. | 
| Purchase Agreement | The purchase and sale agreement, alongside other relevant collateral documents. | 
| Rationale for Decision | A well-articulated rationale supporting the lending decision, including any exceptions made. | 
| Property Insurance | The borrower's agreement and proof of active property insurance. | 
| Mortgage Insurance | Validation of the mortgage insurer's commitment to insuring the mortgage (if applicable).

## Institutional highlights
- Tell your lender why you need the mortgage.
- Show proof of your job and income.
- Your lender will calculate if you can afford your mortgage payments, property taxes, heating, and other debts.
- The lender needs to know the value of the property compared to the mortgage amount, which may require an appraisal.
- Your credit history will be reviewed.
- You'll need to prove where your down payment is coming from.
- Provide the signed purchase agreement and any other paperwork related to the property.
- Your lender needs to explain why they approved your mortgage application.
- You'll need to show you have home insurance.
- If your mortgage needs to be insured, there needs to be proof that the mortgage insurance company has agreed to insure your mortgage.

## Related guide
- https://ratellow.com/guides/brrrr-mortgage-financing

## Sources
- I. Purpose and scope of the guideline — https://www.osfi-bsif.gc.ca/en/guidance/guidance-library/residential-mortgage-underwriting-practices-procedures-guideline-2017#1.0
- IV. Other guidance — https://www.osfi-bsif.gc.ca/en/guidance/guidance-library/residential-mortgage-underwriting-practices-procedures-guideline-2017#4.0
- Mortgage insurance — https://www.osfi-bsif.gc.ca/en/guidance/guidance-library/residential-mortgage-underwriting-practices-procedures-guideline-2017#2.5.1