1. Compare More Than Advertised Rent
Rental A earns $2,800 per month; Rental B earns $2,400. With the same 5% vacancy allowance, effective income is $2,660 and $2,280, respectively.
These are fictional properties. A fair comparison uses consistent assumptions and verified rents, while still recognizing differences in location, condition, and tenant demand.
2. Deduct Costs, Reserves, And Financing
Rental A has $900 in operating costs, $140 in reserves, and a $1,450 principal-and-interest payment. Its projected monthly cash flow is $170.
Rental B has $700 in operating costs, $120 in reserves, and a $1,264 principal-and-interest payment. Its projected monthly cash flow is $196. The lower-rent property leaves $26 more each month under these assumptions.
3. Include Cash Needed To Begin
Suppose Rental A needs $100,000 upfront and Rental B needs $70,000. Annual projected cash flow is $2,040 and $2,352, respectively. Dividing by upfront cash gives illustrative cash-on-cash returns of 2.04% and 3.36%.
This measure is before income tax and excludes appreciation, principal paydown, and sale proceeds. It does not capture every risk, and it cannot establish that either property is a good investment.
4. Keep The Assumptions Beside The Results
Save reviewed versions of both properties, then use Compare Saved Properties to view their inputs and results together. Each saved version uses one Analysis Save.
Test vacancy, repairs, and financing changes. Confirm leases, inspections, permits, insurance, and lender terms before deciding which property deserves further investigation.
Higher Rent Does Not Always Leave More Cash
Fictional monthly figures before income tax. Loan payments and upfront cash are stated assumptions, not lender quotes. Cash-on-cash return excludes equity gains and sale proceeds.
- Scheduled Rent · A / B
- $2,800 / $2,400
- Income After 5% Vacancy
- $2,660 / $2,280
- Operating Costs
- $900 / $700
- Capital Reserves
- $140 / $120
- Principal And Interest
- $1,450 / $1,264
- Monthly Cash Flow
- $170 / $196
- Cash Needed To Begin
- $100,000 / $70,000
- Annual Cash-On-Cash Return
- 2.04% / 3.36%
Keep These In Mind
- Higher rent does not automatically mean higher cash flow.
- Use consistent assumptions and compare starting cash.
- Results help organize research; they do not replace verification.
Further Reading: CFPB: Principal And Interest Vs. Total Mortgage Payment. Separate principal and interest from escrowed taxes and insurance. Confirm actual financing and costs with your lender; the examples here are fictional.









