Key Takeaways
- The three pillars of underwriting—credit, capacity, collateral—must all be verified through documented evidence.
- Pricing optimization across multiple investors can add 25-50 basis points to per-loan profitability.
- QC programs costing $1,000-$3,000 monthly prevent repurchase demands that can exceed $100,000 per incident.
- Pull-through rate monitoring (70-85% target) is the critical metric connecting lock management to profitability.
This recap consolidates the underwriting, verification, valuation, pricing, and quality control frameworks that enable a lending company to make sound credit decisions while maintaining profitability and regulatory compliance.
Underwriting Framework Summary
Mortgage underwriting evaluates credit, capacity, and collateral through a combination of automated underwriting systems and human judgment. Income verification varies by employment type, with self-employed requiring the most documentation (2 years of tax returns). Asset verification demands sourcing of large deposits. DTI thresholds range from 43-50% (conventional) to 56.99% (FHA). One underwriter handles 40-60 loans monthly, with contract underwriting at $200-$400 per loan as a scalable alternative.
Valuation and Pricing Summary
Appraisals are ordered through AMCs to maintain independence, with alternative valuation methods (waivers, hybrids, desktop) reducing costs for eligible transactions. Loan pricing starts with secondary market prices, adjusted by LLPAs and lender margin (100-250 bps). Rate lock management protects against interest rate risk, with pull-through rates of 70-85% as the critical monitoring metric. Non-QM products offer 200-400 bps of additional margin incentivizing diversification.
Quality Control Summary
QC programs must include pre-funding reviews (10-15% of pipeline), post-closing reviews (10% of closed loans within 90 days), and targeted reviews (100% of high-risk loans). Defect rate targets are below 2% critical and below 8% total. Trend analysis by originator, underwriter, and product identifies systemic issues. QC independence from production is essential for credibility. The cost of a QC program ($1,000-$3,000/month) is trivial compared to the cost of investor repurchase demands.
Go / No-Go Decision Framework
Go Indicators
- ✓The three pillars of underwriting—credit, capacity, collateral—must all be verified through documented evidence.
- ✓Pricing optimization across multiple investors can add 25-50 basis points to per-loan profitability.
No-Go Indicators
- ✗Reviewing underwriting concepts without building a specific quality control implementation plan: Underwriting quality remains inconsistent without a systematic QC program, increasing investor repurchase risk and regulatory exposure.
- ✗Advancing to compliance topics (Track 3) before establishing underwriting discipline: Compliance requirements build on underwriting foundations; without sound underwriting, compliance becomes impossible to implement correctly.
Sources
Common Mistakes to Avoid
Reviewing underwriting concepts without building a specific quality control implementation plan
Consequence: Underwriting quality remains inconsistent without a systematic QC program, increasing investor repurchase risk and regulatory exposure.
Correction: Develop a detailed QC implementation plan with sampling methodology, review procedures, finding categories, and corrective action protocols before originating loans.
Advancing to compliance topics (Track 3) before establishing underwriting discipline
Consequence: Compliance requirements build on underwriting foundations; without sound underwriting, compliance becomes impossible to implement correctly.
Correction: Ensure underwriting procedures are documented, tested, and producing acceptable deficiency rates before progressing to regulatory compliance.
Test Your Knowledge
1.What is the minimum post-closing QC review sample required by Fannie Mae and Freddie Mac?
2.What is the maximum back-end DTI ratio for FHA loans with automated underwriting approval?
3.How many loans per month can one full-time underwriter typically process?