Interest Adjustment Date
What is Interest Adjustment Date in British Columbia?

Key Points
- What is the Interest Adjustment Date (IAD) in a BC residential mortgage transaction?
- Is the Interest Adjustment Date set by BC law or by the lender?
- How is the interest adjustment charge calculated between completion and the IAD?
- When is the interest adjustment charge paid in a BC real estate transaction?
- Does the Interest Adjustment Date affect my first regular mortgage payment date?
The Interest Adjustment Date (IAD) is the date from which a mortgage lender begins calculating the first full payment period. Because BC completion dates do not always fall on the first day of a month, a short-period interest-only charge — commonly called the interest adjustment — bridges the gap between the completion date and the IAD. This one-time charge covers only the interest accruing during that partial period and is separate from regular mortgage payments. Borrowers should confirm the exact IAD and any associated costs with their lender before completion; verify current details with a BC lawyer, notary, or licensed mortgage professional.
General information only — not legal, financial, tax, or real-estate advice. For your situation consult a licensed BC REALTOR®, lawyer, notary, or accountant.
Frequently Asked Questions
What is the Interest Adjustment Date (IAD) in a BC residential mortgage transaction?
The Interest Adjustment Date is the date on which the borrower's regular monthly mortgage payment cycle officially begins, typically the first day of the month following the completion date. If the completion date does not fall on the first of the month, the borrower pays a one-time interest-only charge covering the period from completion to the IAD. This is a standard commercial mortgage practice and is not governed by a specific BC statute; verify the calculation method and rate with your lender and BC lawyer or notary before closing.
Is the Interest Adjustment Date set by BC law or by the lender?
The IAD is not mandated by a specific provision in BC legislation; it is a contractual matter set by the lender in the mortgage agreement and disclosed in your mortgage commitment letter. The borrower and lender agree to the IAD as part of the terms of financing. Verify all IAD terms, including the interest calculation method, with your lender and BC lawyer or notary before you complete the purchase.
How is the interest adjustment charge calculated between completion and the IAD?
The interest adjustment charge is typically calculated as daily interest (annual mortgage rate divided by 365, multiplied by the principal amount advanced, multiplied by the number of days from completion to the day before the IAD). The exact calculation method, rounding conventions, and whether the lender uses a 365-day or 360-day year are contractual matters not prescribed by BC statute. Verify the calculation in your mortgage commitment letter and statement of adjustments with your lender, mortgage broker, BC lawyer, or notary before closing.
When is the interest adjustment charge paid in a BC real estate transaction?
The interest adjustment charge is typically paid on the completion date and appears as a debit to the buyer on the statement of adjustments prepared by the buyer's lawyer or notary. This is a one-time payment separate from the first regular monthly mortgage payment, which begins on the IAD. Verify the exact payment timing and amount on your statement of adjustments with your BC lawyer or notary before closing.
Does the Interest Adjustment Date affect my first regular mortgage payment date?
Yes. The IAD determines when your first regular monthly mortgage payment is due; it is typically the first day of the month following the completion date. The interest adjustment charge covers interest only from completion to the day before the IAD, and your first full payment (principal and interest) is due on the IAD. Verify your payment schedule in your mortgage commitment letter with your lender and BC lawyer or notary.
Can I choose my own Interest Adjustment Date in BC?
In most cases, the IAD is set by the lender's policy and is the first day of the month following your completion date; however, some lenders may allow negotiation if closing occurs early in a month. This is a contractual matter between borrower and lender, not governed by a specific BC statute. Discuss any desired IAD with your mortgage broker or lender before finalizing your mortgage commitment, and verify all terms with your BC lawyer or notary.
Is the interest adjustment charge tax-deductible in BC?
Mortgage interest deductibility is governed by the federal Income Tax Act, SC 1985, c. 1 (5th Supp.), and generally interest on a loan to purchase a principal residence is not deductible for an individual taxpayer. The interest adjustment charge is considered prepaid mortgage interest. Verify the current federal tax treatment of the interest adjustment charge and your specific circumstances with a licensed tax professional (CPA or tax lawyer) before claiming any deduction.
Does the IAD appear on my BC Land Title registration documents?
No. The Interest Adjustment Date is a term in your mortgage agreement and commitment letter, not a matter registered on title under the BC Land Title Act, RSBC 1996, c. 250. The registered mortgage instrument typically states the principal amount, interest rate, and payment terms, but the IAD and interest adjustment charge are disclosed in your mortgage documents and statement of adjustments. Verify all mortgage terms with your BC lawyer or notary at closing.
If I complete on the 15th of the month, how many days of interest adjustment do I typically pay?
If you complete on the 15th and your IAD is the 1st of the following month, you would typically pay interest for the number of days from the 15th to the end of that month (e.g., 16 days in a 30-day month). The exact number of days and calculation method are set by your lender in the mortgage commitment. Verify the precise calculation, including whether the completion day itself is included, with your lender and on your statement of adjustments prepared by your BC lawyer or notary.
Are there any BC consumer protection rules that regulate how lenders disclose the IAD?
Federally regulated lenders (banks, federal credit unions) must comply with disclosure requirements under regulations made under the Bank Act, SC 1991, c. 46, and oversight by the Financial Consumer Agency of Canada (FCAC). BC credit unions are supervised by the BC Financial Services Authority (BCFSA) under the Financial Institutions Act, RSBC 1996, c. 141. There is no single BC statute that prescribes the exact format or timing for IAD disclosure; it is typically provided in the mortgage commitment letter. Verify that you have received and understand all IAD terms in writing from your lender, and review them with your BC lawyer, notary, or mortgage broker before closing.
Verify the specific statutory language, thresholds, deadlines and current guidance directly with the governing authority:
- Financial Consumer Agency of Canada ↗Financial Consumer Agency of Canada
- OSFI Guideline B-20 — Residential Mortgage Underwriting Practices and Procedures ↗Office of the Superintendent of Financial Institutions (OSFI)
- Bank of Canada ↗Bank of Canada
- Canada Mortgage and Housing Corporation (CMHC) ↗CMHC — Government of Canada
- Canada Deposit Insurance Corporation (CDIC) ↗CDIC — Government of Canada
- Financial Consumer Agency of Canada (FCAC) ↗Government of Canada
- BC Financial Services Authority (BCFSA) ↗BC Financial Services Authority