Rental-property cash flow is not simply rent minus the mortgage. A property can appear profitable until the owner includes the costs that occur irregularly or outside the monthly loan payment.
Start with gross scheduled rent
Use a rent assumption grounded in current comparable rentals and the property’s actual condition. Then apply a vacancy assumption rather than assuming twelve perfect months of collection every year.
Property taxes
Verify current taxes and consider how ownership changes, exemptions or reassessment may affect future bills. Do not assume the seller’s tax amount will remain identical.
Insurance
Quote insurance for the property’s intended rental use. A rental dwelling may require a different policy structure than an owner-occupied home.
Maintenance
Routine maintenance includes smaller repairs and recurring items such as plumbing fixes, HVAC servicing, landscaping, pest control or appliance work depending on the property.
Capital expenditures
Large systems do not fail every month, but they eventually need replacement. Roofs, HVAC systems, water heaters, exterior surfaces and major appliances should be reflected in a long-term capital reserve.
Vacancy
Vacancy is not only lost rent. It can also include utilities, cleaning, lawn care, advertising and time spent preparing the unit for the next tenant.
Property management
If you plan to use professional management, include management and leasing costs in the acquisition analysis from the beginning. Do not calculate a deal as self-managed and then expect the same return after adding management later.
Turnover and leasing
Tenant turnover can generate cleaning, paint, repair, lock-change, marketing and leasing expenses. A property with frequent turnover may perform differently from one with stable long-term occupancy.
Owner-paid utilities and HOA costs
Water, trash, lawn care, association dues and shared utilities can materially change cash flow. Read the HOA documents and lease structure carefully.
Stress-test the deal
Test lower rent, a month of vacancy, a large repair and a higher insurance premium. If one realistic surprise eliminates the annual return, the deal may be operating with too little margin.
Coso next step
Use the investor path together with property-management resources before relying on a projected cash-flow number.
Educational notice: This is general investment education, not tax, accounting, appraisal or investment advice.