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June 29, 2026

Understand Top Defects to Help Strengthen Loan Quality

Strong loan quality protects more than your bottom line; it supports sustainable homeownership and builds borrower confidence. Our latest post-purchase file review insights reveal the most common defects and emerging trends impacting lenders today, giving you actionable opportunities to strengthen your quality control (QC) program, reduce risk, and improve loan quality. Explore the key trends to see where your organization may be vulnerable — and what you can do now to stay ahead. 

To maximize the benefits of this information, consider: 

  • Strengthen QC reviews by targeting the defects and patterns showing up most often across the industry.
  • Refine discretionary sampling and QC processes to better align with industry best practices.
  • Utilize tools, such as Desktop Underwriter® (DU®), DU validation service, or Income Calculator, to drive greater certainty and accuracy.
  • Leverage industry defect trends to inform your training programs and improve your controls to reduce the risk of future defects.
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Random Sample 

We perform randomly selected post-purchase file reviews on a regular cadence to effectively manage the quality risk of our acquisitions. Below are the top ten initial significant defects identified in our random sample of loans acquired during the third and fourth quarters of 2025:  

Top 10 initial significant defects Q3 and Q4 2025: random sample 

  1. Misrepresentation of primary occupancy
  2. Misrepresentation of income
  3. Incorrect income calculation – rental income/loss
  4. Undisclosed liability
  5. Omission of debts documentation missing
  6. Monthly payments not properly calculated
  7. Incorrect income calculation – base
  8. Income not documented – rental income/loss
  9. Borrower not employed
  10. Insufficient assets to close
Top Defect

Misrepresentation of primary occupancy 

  • The borrower’s intent, per the loan application, is for the subject property to be utilized as a primary residence. Upon review, data confirms the subject property was listed as a rental property after the closing date, or the insurance policy includes language – such as “rent loss coverage” – that is indicative of a rental property.
  • This defect has consistently been one of the most frequently cited over the last 12 months.
Best Practices
  • Loan officers, as the first line of defense against occupancy misrepresentation, should know their borrowers and ask situational questions. Be aware of common occupancy red flags and reinforce the commitments and legal representations that borrowers must make when they sign the loan application.
  • Assess whether the purchase of the property aligns with the borrowers’ current living situation. Are borrowers buying a 1,200 square foot house when they already own a 2,500 square foot house? Are they moving from a 5-bedroom house to a 2-bedroom house?
  • Evaluate the location of the subject property and its proximity to the borrower’s employment. Consider the type of position and if it supports remote employment. If a borrower is buying a primary residence in a different state from where they own a business, consider whether their income is likely to remain stable and whether the occupancy representation is plausible or likelihood of primary occupancy.
  • Underwriters should review the file holistically, including tax returns, bank statements for evidence of rental income, credit history for multiple mortgages, and the homeowner’s insurance declaration page for language that suggests the property may be a rental. If the borrowers own a home, confirm what its status will be after closing.
  • Consider implementing a separate borrower attestation process – distinct from the loan application – reinforced with pre-closing confirmation to document the borrower’s intent to occupy the subject property as a primary residence.
  • For additional best practices, review this Quality Insider from 2024.

 

 

Top Defect

Omission of debts documentation missing/insufficient

  • A financial obligation was listed on the loan application or is identified on bank statements, tax transcripts, title work, or other documents but it was not included in the debt-to-income (DTI). No documentation was included in the file to exclude the obligation from the DTI; and the inclusion of the obligation led to a DTI exceeding eligibility thresholds.
Best Practices
  • Lenders must review all file documents used to quality the borrower (per the Selling Guide B3-6-01) to ensure all required liabilities are included in the DTI.
  • Loan officers should review credit reports with borrowers and ask if there are any financial obligations that are not shown on the credit reports.
  • Underwriters should include property documents in the review; condo questionnaires and appraisals may note the existence of solar panel payments, special assessments, or liens.
  • If borrowers provide documentation to exclude a liability, confirm the documentation demonstrates that they are not responsible for the payment. Determine whether another party pays the obligation, or if it is paid in full.
  • Review the asset statements to identify any recurring payments to a creditor. Obtain information to confirm the terms of the obligation and the borrowers’ responsibility.

 

 

Top Defect

Incorrect income calculation – rental income/loss and
Income not documented – rental income/loss

  • Rental income calculations and documentation requirements differ depending on the property type, documentation available, and occupancy. As a result, these defects include multiple root causes, including missing lease agreements, which are often required to include rental income in the DTI calculation; missing tax returns, which are required to include a rental loss in the DTI calculation; and a lack of rental history, which is sometimes required to include both rental income and/or loss in the DTI calculation.
Best Practices
  • Establish rental income eligibility, and confirm that it can be documented properly, before calculating the income.
  • If Form 1007 is involved in the rental income calculation, compare the expected rent as stated to the lease provided by the borrowers.
  • Include your rental income calculation in the file documentation as support of your determination in case the file is reviewed after closing.
  • If you have tax returns, utilize Fannie Mae’s Income Calculator to calculate rental income and potentially receive rep and warrant relief on the calculation.
  • Review Fannie Mae’s best practices to calculate rental income.

 

Targeted and Discretionary Samples 

Discretionary or targeted reviews focus on loans with a higher likelihood of having defects in manufacturing quality.  

Below are the top ten initial significant defects identified in our discretionary sample of loan reviews completed last quarter of 2025 and first quarter of 2026 (October 2025 – March 2026).  

Top 10 initial significant defects Q4 2025 and Q1 2026: discretionary sample 

  1. Undisclosed liability
  2. Borrower not employed
  3. Interested party contributions exceed borrower costs
  4. Undisclosed mortgage(s)
  5. Employment validation – borrower not employed
  6. Misrepresentation of primary occupancy
  7. Monthly payments not properly calculated
  8. Inadequate comparable adjustment(s)
  9. Omission of debts documentation missing/insufficient
  10. Failure to adjust comparables

Findings 

Reviewing findings from a random sample can help you identify potential issues early. Although findings do not create eligibility defects, they can signal control gaps and help you reduce risk and improve loan quality. Below are the top ten findings identified in our random sample of loans acquired during the third and fourth quarters of 2025 (July 2025 to December 2025). 

 

Top 10 findings Q3 and Q4 2025: random sample 

  1. Inadequate comparable adjustments
  2. Failure to adjust comparables
  3. Insufficient assets to close
  4. Asset documentation missing/incomplete/ineligible
  5. Subject physical features reported inaccurately – condition/quality of construction
  6. Omission of debts - documentation missing/insufficient
  7. Income not documented - base
  8. Monthly payments not properly calculated
  9. Incorrect income calculation – rental income/loss
  10. Inappropriate comparable sale(s) selection - location

 

Key insight from the findings 

The findings data points to two notable themes. Appraisal-related issues made up four of the top ten findings, highlighting an opportunity to strengthen appraisal review and feedback loops. Share appraisal findings with appraisal management companies or appraisers to help them better understand our appraisal reviews.

Several other findings involved liabilities, assets, and income documentation or calculation issues that may not create immediate eligibility defects but can still signal control gaps that warrant closer attention. For example, consider: 

  • Check paystubs for garnishments, including child support and alimony.
  • Review bank statements for evidence of payments of obligations that do not appear on credit reports.
  • Ensure real estate obligations, including tax bills, insurance payments, and HOA dues, which were often excluded or miscalculated, are correctly included. 

By making the most of these insights on top defects and trends, you can strengthen your quality control, mitigate risk, and drive long-term success. Start enhancing your loan processing today and reap the rewards of improved certainty, reduced risk, and increased customer satisfaction.