Checking the final interest rate against a documented rate lock
Guidance on validating your final mortgage interest rate against your signed rate lock agreement for a transparent Illinois home financing experience.
The short answer
Your interest rate is a primary driver of your long-term mortgage costs. You must compare the rate on your Closing Disclosure to your original rate lock agreement. If you paid 'points' to lower your rate, ensure those fees appear correctly, as lenders cannot change your locked rate unless specific, documented circumstances occur.
Verifying the Rate Lock
A rate lock limits the lender's ability to change your interest rate. Check the Closing Disclosure to ensure the rate matches the specific percentage guaranteed in your written lock agreement.
Planning Example: If your agreement states 6.5% but the disclosure shows 6.75%, request that the lender verify your lock expiration date and provide documentation explaining the discrepancy.
Assessing Upfront Points
Points are upfront fees paid to secure a lower rate. If you paid for these, the Closing Disclosure should explicitly list them under the 'Origination Charges' section.
Planning Example: Create a comparison table: 'Expected Rate (6.5%)' vs. 'Actual Rate (6.5%)'. If the 'Points' fee is missing, clarify if the rate was achieved without them or if there was a calculation error.
Adjustable Rate Risks
Verify that your loan is a fixed-rate product if that is what you requested. If your disclosure indicates an adjustable rate, the document must state this clearly in the 'Loan Terms' section.
Planning Example: Check the column for 'Adjustable Interest Rate'—it should be marked 'NO' if you are securing a traditional fixed-rate mortgage.
Clarifying Rate Changes
If your rate has changed without a clear reason, ask your loan officer if it was due to a lock expiration or a change in your loan program. If you are unsatisfied, consult a real estate professional regarding your rights under the loan agreement.
Checklist
- Locate your signed rate lock agreement
- Compare lock percentage to Closing Disclosure rate
- Verify 'Points' are listed if applicable
- Check for 'Adjustable Rate' indicators
- Request explanation for any rate increases
Common questions
Can a lender change my rate after I lock it?
Generally, no, provided the lock period has not expired and your loan application details remain unchanged. If a change occurs, the lender must justify it based on the lock agreement terms.
What is the difference between APR and interest rate?
The interest rate is the base cost of borrowing, while the APR includes the interest plus other fees, providing a more accurate metric for comparing total loan costs.
Sources
- CFPB — Loan Estimate explainerChecked October 12, 2026
- CFPB — Closing Disclosure explainerChecked October 12, 2026
- Illinois Department of Revenue — Property tax overviewChecked October 12, 2026
- IRS Publication 523 — Selling Your HomeChecked October 12, 2026
This guide is general educational content from SQFT IO, prepared with AI assistance. It is not legal, tax or loan advice. Talk with a licensed attorney, tax professional or lender about your situation. SQFT IO Illinois license 478.027617.
