Why rent growth matters
A property with a thin 4% cash-on-cash return in year one may look very different in year 10 if rents have grown 30-40% while the mortgage payment stays fixed. Modeling that trajectory — even conservatively — gives a more accurate picture of the investment's long-run return. Net operating income (NOI) grows with rents, which also drives the eventual sale price (via cap rate math).
Building a simple projection
Start with current gross rent. Apply an assumed annual growth rate compounded forward: Year 2 rent = Year 1 x 1.03, and so on. Historical US multifamily rent growth has averaged roughly 3-4% per year over the long run, but local markets vary significantly — always check recent local data. Apply a separate growth rate for operating expenses (often tracking inflation). Recalculate NOI for each year of the projected hold period.
Stress-testing your assumptions
Run at least three scenarios: 0% rent growth (flat), a base case (e.g., 3%), and an optimistic case (e.g., 5%). The spread between outcomes shows how sensitive the investment is to rent assumptions. A deal that only pencils under aggressive rent growth carries real risk. Conversely, a property that already breaks even with 0% growth has a much larger margin of safety. Share your model assumptions explicitly when presenting a deal to lenders or partners.
Frequently asked questions
What rent growth rate should I use in projections?
Use historical data for your specific market as a base. Long-run national averages around 3-4% are a reasonable starting point, but local supply and demand conditions matter most. Always run a 0% growth stress case.
How does rent growth affect the internal rate of return (IRR)?
Significantly — even 1-2% additional annual rent growth materially improves IRR by lifting NOI each year and driving a higher exit valuation at sale.
Sources
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.