How much should buyers trust rental projections?

Rental projections are useful, but they are not promises.

That is the first thing every buyer should understand.

A projection is an estimate based on assumptions. Some assumptions may be reasonable. Some may be optimistic. Some may be built more for selling than for operating.

The problem is not that projections exist. Investors need some way to think about future income. The problem is when buyers treat a projection like a guarantee.

Short-term rental income depends on many variables. Occupancy, nightly rate, seasonality, reviews, location, design, furniture, competition, building rules, platform visibility, management quality, cleaning quality, guest communication, maintenance, and pricing strategy all matter.

A spreadsheet cannot control those things.

The first question to ask is whether the projection is gross or net. Gross income is total rental revenue before expenses. Net income is what remains after expenses. Many buyers get excited by gross numbers and then discover how much it costs to operate the property.

Expenses can include property management, cleaning, laundry, utilities, internet, HOA fees, repairs, platform fees, replacement items, taxes, insurance, accounting, and vacancy. If the property is used personally, that also reduces rental availability.

A projection that ignores expenses is not an investment analysis. It is a sales tool.

The second question is what data supports the projection. Is it based on actual performance from similar units in the same building? Similar units nearby? A hotel market report? Platform data? Broker opinion? Developer assumptions?

The closer the data is to the actual unit, the more useful it becomes. A one-bedroom in the same building with similar views, furniture, and management is more relevant than a luxury penthouse two neighborhoods away.

The third question is whether the projection accounts for seasonality. Playa del Carmen does not perform the same every month. High season, low season, holidays, weather, travel patterns, flight availability, exchange rates, and broader economic conditions all influence demand. A good projection should show monthly variation, not one smooth average that makes the year look easy.

The fourth question is whether the projection includes competition. Your unit does not operate alone. It competes against other condos, hotels, aparthotels, branded residences, and new supply coming to market. If many similar units are delivered at the same time, nightly rates may face pressure.

A projection based only on past performance may not reflect future competition.

The fifth question is who will manage the property. Operations can make a big difference. Two similar units can produce different results because one manager is better at pricing, photos, guest service, maintenance, and reviews. A strong operator can improve performance, but even the best manager cannot make a weak product unbeatable.

Management helps. It does not perform miracles.

The sixth question is whether the unit is designed for rental. Some units photograph well but do not operate well. Is there storage? Is the furniture durable? Are there enough outlets? Is the air conditioning efficient? Is check-in easy? Is there noise? Can guests sleep comfortably? Is the kitchen useful? Are the common areas reliable?

Guests leave reviews based on experience, not renderings.

The seventh question is what happens in a downside case. What if occupancy is 15% lower? What if nightly rates are lower? What if management costs more? What if repairs are higher? What if the building has restrictions? What if a nearby project adds supply?

A good investment should still make sense if the projection is not perfect.

Buyers should also be careful with guaranteed returns. A guarantee can be legitimate, but it depends on who is making it, how it is funded, what conditions apply, and whether it is written into a clear contract. Sometimes a guaranteed return is really just part of the purchase price being returned to the buyer over time.

Always ask where the money comes from.

The best way to use a rental projection is as a starting point. It helps frame the opportunity. Then you stress test it. Reduce revenue. Increase expenses. Add vacancy. Add replacement reserves. Ask what the net result looks like.

If the investment still works under conservative assumptions, that is more meaningful.

Real operators do not ask, “What is the highest return we can show?”

They ask, “What is the return we can reasonably defend?”

That difference matters.