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Understanding HMDA Data: A Plain-English Guide
Published by: OpenFileData.com
Category: Educational Guides
Last Updated: September 2026
What is HMDA?
The Home Mortgage Disclosure Act (HMDA) is a federal law enacted by the United States Congress in 1975. Implemented by federal regulators through Regulation C, HMDA requires mortgage lenders across the country to maintain and publicly disclose detailed records about the home loan applications they receive each year.
Before HMDA was enacted, the public and community advocates had virtually no visibility into how banks and mortgage companies allocated credit across different neighborhoods. HMDA was designed to provide public transparency into three main questions: 1. Are lenders serving the housing credit needs of their local communities? 2. Are public and private investments reaching neighborhoods that need them? 3. Are lending patterns fair, equitable, and free from unlawful discrimination?
HMDA data is collected annually by federal regulatory agencies—including the Consumer Financial Protection Bureau (CFPB) and the Federal Financial Institutions Examination Council (FFIEC)—and is published as the largest, most comprehensive public dataset on residential mortgage lending in the world.
Who Reports HMDA Data?
Not every business that touches a mortgage reports HMDA data. Federal rules establish explicit criteria based on loan volume, asset size, and business structure.
Generally, HMDA reporting covers:
- Depository Institutions: Commercial banks, savings banks, and credit unions that have a physical branch or home office in a metropolitan area and meet minimum asset and loan volume thresholds.
- Non-Depository Lenders (Independent Mortgage Banks): Dedicated mortgage companies and online lenders that do not take customer deposits but originate at least 100 closed-end consumer mortgages in each of the two preceding calendar years.
Today, independent mortgage banks originate a significant share of all consumer residential mortgages in the United States, and both depository banks and independent lenders report their application activity under the same unified federal standard.
What Kinds of Loan Records Are Included?
Every time an individual or entity formally applies for a mortgage with a reporting lender, a detailed record is generated in the institution’s Loan Application Register (LAR).
These records encompass:
- Home Purchase Loans: Financing used to buy a residential property.
- Refinancing & Cash-Out Refinancing: Loans replacing an existing mortgage, either to change interest rates/terms or to extract accumulated home equity.
- Home Improvement Loans: Financing specifically taken to repair or renovate a home.
- Closed-End and Open-End Loans: Traditional fixed-term mortgages as well as revolving home equity lines of credit (HELOCs).
- Manufactured Housing: Site-built houses as well as factory-constructed manufactured homes.
- Multifamily Housing: Residential apartment complexes containing 5 or more units.
The records also document the formal outcome of every application—whether the loan was originated, approved but turned down by the borrower, denied by the lender, withdrawn by the applicant, or closed due to incomplete paperwork.
What the Public Data CAN Tell Us
When analyzed systematically, HMDA public records provide unmatched insights into regional and national housing finance:
- Local Market Activity: How many mortgage applications were submitted, and how many loans were funded in any state, metropolitan area, or county.
- Lender Footprint: Which financial institutions originate the highest volume of mortgages in a community, and what share of the local market they hold.
- General Approval and Denial Patterns: The overall percentage of applications that lenders approve or deny within specific geographies or market segments.
- Borrower Demographics: Factual distributions of lending activity across income levels, racial and ethnic categories, and applicant age groups.
- Typical Borrowing Amounts: The average and median loan amounts funded in a market, showing how borrowing sizes shift over time.
- Year-over-Year Trends: Whether credit activity in a market is expanding or contracting relative to the preceding year.
What the Public Data CANNOT Tell Us
While HMDA is an extraordinary transparency tool, it has fundamental limitations. Readers should understand what the data does not disclose:
1. Credit Scores Are Redacted
To protect consumer privacy under federal law, individual applicant credit scores (such as FICO or VantageScore numbers) are completely redacted from public loan registers. Because credit scores are a central factor in mortgage underwriting, public data cannot tell you whether an applicant had prime credit or severe credit delinquencies.
2. It Cannot Prove Why an Individual Was Approved or Denied
Public HMDA records do not contain the full underwriting file. They do not show bank statements, debt-to-income verification documents, employment tenure, appraisal reports, or title histories. Aggregate data cannot determine the specific underwriting reason an individual borrower was rejected.
3. Disparities Do Not Automatically Prove Legal Discrimination
In public reports, substantial differences in approval and denial rates often appear between income brackets and demographic groups. However, raw statistical disparities alone do not establish legal bias or discrimination under fair lending laws. Formal fair lending examinations conducted by federal regulators evaluate non-public data, controlling for credit scores, debt ratios, loan-to-value ratios, and other proprietary underwriting standards.
4. It Does Not Track Loan Performance After Origination
HMDA captures the moment of application and origination. It does not track whether a borrower made payments on time, defaulted, entered forbearance, or repaid the loan in full.
How OpenFileData Uses HMDA Data
Raw HMDA files contain tens of millions of lines and more than 100 technical fields per loan, making direct use challenging for everyday consumers.
OpenFileData applies a transparent, documented analytical framework: 1. Filtering for Everyday Consumers: We filter out commercial apartment complexes, corporate LLC transactions, junior second liens, reverse mortgages, and secondary market portfolio trades to focus specifically on retail, 1-to-4 family, owner-occupied homes. 2. Clear Mathematical Denominators: We strictly define our Actionable Application Universe (Actions 1, 2, and 3) so that approval and denial rates are calculated solely on applications that reached a definitive credit decision. 3. Transparent Procedural Tracking: We retain withdrawn applications (Action 4) and incomplete files (Action 5) in our broader Consumer Mortgage Universe so users can see full application volume without distorting underwriting rates. 4. Statistical Guardrails: We flag small sample groups (fewer than 30 applications) to prevent readers from drawing sweeping conclusions from volatile numbers.
Important Notice
OpenFileData.com is a public-interest data transparency project. This guide is provided strictly for informational and educational purposes and does not constitute financial, credit, mortgage, or legal advice. Loan decisions are made by licensed lenders based on individual underwriting factors not contained in public HMDA records.