KARPATA INVESTOR ACADEMY · COURSE 1

Worked Example: Putting the Numbers Together

Understand how rental-property financing works, including DSCR, leverage, cash flow, reserves, refinancing, seasoning and lender underwriting.

45–60 minBeginner / Intermediate27 modules
MODULE 21 OF 27

Worked Example: Putting the Numbers Together

Rent Cushion; Sensitivity Analysis; Break-Even

Assume a $300,000 single-family rental purchase with a $240,000 loan, $2,650 qualifying rent, and $2,250 PITIA. LTV is 80%. DSCR is approximately 1.18, leaving a $400 rent-over-PITIA cushion. Add $200 management, $125 maintenance reserve, and $125 vacancy reserve, and the actual projected cash flow becomes negative $50. Qualification and investment quality are therefore different questions.

From the lender’s perspective, this topic can affect eligibility, pricing, leverage, documentation, or the amount of capital available. From the investor’s perspective, the same issue can affect cash flow, return on equity, liquidity, risk, and the timing of an eventual sale or refinance. The strongest financing decisions account for both perspectives rather than optimizing only one number.

When analyzing a real transaction, separate confirmed facts from assumptions. Use actual lease terms, current tax and insurance information, realistic property values, and conservative operating costs whenever possible. If a key number is uncertain, model more than one outcome. This makes it easier to see whether the deal remains viable when the appraisal, rent, interest rate, expenses, or closing timeline changes.

Before moving to the next module, connect this concept to the property you selected at the beginning of the course. Write down how this variable could change the loan structure and how it could change the property’s actual economics. That habit—linking underwriting mechanics to investment outcomes—is one of the most useful disciplines a real estate investor can develop.

Worked example

If the loan falls from $240,000 to $225,000 and PITIA drops by roughly $100, DSCR improves and the property may move from negative to positive monthly cash flow after reserves.

Mini glossary

Rent Cushion
The amount qualifying rent exceeds lender housing expense.
Sensitivity Analysis
Testing how results change when assumptions change.
Break-Even
The point where income equals expenses.

Put it into practice

Run base, 10%-lower-rent, and 10%-higher-expense cases for your sample property.

Recommended reading

Use these primary sources for context. Individual lender requirements can change; confirm the current program for your transaction.

Educational examples are illustrative, not actual loan offers or guaranteed outcomes. Program terms vary. Confirm current requirements, definitions and eligibility for your transaction.

Have a scenario? Ask Karpata to review it or call 480-846-1001.