A cap rate can help you compare rental properties, but it will not tell you what lands in your bank account after the mortgage. IRR answers a different question: how might the investment perform over the full time you own it?
I use both. Before either number helps, though, the rent and expense assumptions need to hold up.
What cap rate tells you
Cap rate is annual net operating income divided by the property price or value. Operating expenses include items such as taxes, insurance, management, maintenance, and vacancy. Loan payments and income taxes are not part of NOI. Major capital work is usually budgeted separately, so check how a listing’s advertised number treats it.
Use the same expense definitions when comparing two properties. A listing based on projected rents and an owner-managed budget is not directly comparable with one using actual collected rent and paid management.
What is a good cap rate in Tampa Bay?
There is no single number that makes a Tampa Bay rental a good purchase. A small duplex with a roof expense coming up is different from a stabilized apartment building. An advertised cap rate also says little about flood exposure, insurability, deferred work, or whether the rents can be supported.
I would rather check a property’s rent roll, expenses, condition, and nearby sales than apply a broad market average to the wrong building. Do not treat older market statistics as a current quote.
Cap rate vs. cash-on-cash return vs. IRR
- Cap rate: compares property-level operating income with price, before financing.
- Cash-on-cash return: compares annual cash flow after debt payments with your cash invested. Be clear about whether reserves and capital work are included.
- IRR: is the discount rate that makes the net present value of the investment’s dated cash flows equal zero. It can include the initial investment, later contributions, distributions, and sale proceeds.
With IRR, be explicit about whether you are modeling the property without debt or your equity after financing. Those are different returns.
Where an IRR projection can mislead you
A spreadsheet can show an attractive IRR because it assumes higher rents or a generous sale price. Neither is guaranteed. Run another version with less rent growth, higher expenses, a longer hold, and a weaker exit. Check the cash you may need along the way, not just the final percentage.
IRR is also not the same as a guaranteed compound return on every dollar you receive. Cash-flow timing matters, and unusual cash-flow patterns can produce multiple IRRs or none. CFA Institute’s discussion of IRR’s limitations explains why the headline percentage needs context.
Check the actual deal
Start with the Tampa Bay rental deal analyzer to estimate the payment and monthly cash flow. If you are comparing room rentals, use the PadSplit feasibility screener, then verify zoning, occupancy, insurance, and any HOA restrictions for the exact address.
For financing and strategy comparisons, DealCooker is free. If you want me to review the property with you, send me the address and your rental plan. You can also read about how I work with Tampa Bay investors.
