Key Takeaways
- Mortgage instruments range from fully amortizing fixed-rate to IO and balloon structures.
- The P&I formula, LTV, DTI, and DSCR are the four essential calculations in financing analysis.
- Instrument selection must match investor strategy, holding period, and risk tolerance.
- In high-rate environments, total return analysis is more relevant than year-one cash flow.
This recap consolidates the key financing instruments, formulas, and decision frameworks covered in Track 1. Use the review questions to test your command of the material before advancing to underwriting and decisioning.
Instrument Summary
Traditional mortgage financing spans a spectrum from fixed-rate to adjustable-rate to interest-only products, each with distinct risk-return profiles. Fixed-rate instruments (30-year at 6.72%, 15-year at 5.99%) provide payment certainty. The 5/1 ARM at 6.12% offers initial savings with adjustment risk. Commercial loans, bridge loans, and DSCR products serve investors whose needs exceed conventional residential guidelines.
Critical Formulas
Three formulas define financing analysis: the P&I payment formula determines monthly obligations, the LTV ratio determines borrowing capacity, and DTI/DSCR ratios determine qualification. These calculations are interconnected—a higher LTV means a larger loan, which increases P&I, which increases DTI, which may disqualify the borrower. Effective financing strategy requires optimizing all three simultaneously.
Key Takeaways
- ✓Mortgage instruments range from fully amortizing fixed-rate to IO and balloon structures.
- ✓The P&I formula, LTV, DTI, and DSCR are the four essential calculations in financing analysis.
- ✓Instrument selection must match investor strategy, holding period, and risk tolerance.
- ✓In high-rate environments, total return analysis is more relevant than year-one cash flow.
Sources
- Freddie Mac — Primary Mortgage Market Survey (PMMS)(2025-01-15)
- CFPB — Consumer Mortgage Resources(2025-01-15)
- Federal Reserve — Mortgage Debt Outstanding(2025-01-15)
Common Mistakes to Avoid
Treating all mortgage products as interchangeable and selecting based solely on rate
Consequence: Mismatched product selection leads to payment shock, prepayment penalties, or inability to exit
Correction: Match the loan structure to your investment strategy: holding period, exit plan, and cash flow requirements should drive product selection
Memorizing formulas without understanding how LTV, DTI, and DSCR interact
Consequence: Inability to diagnose why a deal fails underwriting or to restructure it for approval
Correction: Practice working backwards from qualification thresholds to determine maximum loan amounts and minimum required income or NOI
Test Your Knowledge
1.What is the approximate monthly P&I payment on a $300,000 loan at 6.72% for 30 years?
2.What does a DSCR of 1.25 indicate?
3.At what LTV threshold can conventional PMI be removed?
4.Which financing structure creates the highest refinance risk?