Rental Property Income: Realistic Numbers After Expenses
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Start With Gross Rent, Then Subtract Everything
The most common mistake in early rental analysis is treating gross monthly rent as the residual income figure. A realistic model subtracts the mortgage principal and interest, property taxes, insurance, a maintenance reserve, a vacancy allowance (rarely is a unit rented 100% of the year, every year), and any property management fee.
Vacancy and Turnover Are Not Edge Cases
Even well-run rentals experience tenant turnover, and each vacancy period costs both lost rent and turnover expenses (cleaning, repairs, re-listing). Modeling a vacancy allowance — even a conservative one — keeps projections honest rather than best-case.
Cash Flow vs Appreciation
Some investors accept thin or even negative monthly cash flow in exchange for property appreciation and mortgage paydown over time. That can be a valid long-term wealth strategy, but it is a different goal from building spendable residual income today — it's important to be clear about which one you're actually optimizing for.
Frequently Asked Questions
What is the '1% rule' in real estate?
A rough screening heuristic suggesting monthly rent should be at least 1% of the purchase price before deeper analysis — it's a filter for further research, not a guarantee of profitability.
How much should I budget for maintenance?
Many investors budget a percentage of the property's value annually (commonly cited figures range from 1–2%) as a reserve, though older properties or those with major systems (roof, HVAC) nearing end-of-life may need more.
Is rental income truly passive?
It varies. Self-managed rentals require real time for tenant screening, repairs, and turnover; hiring a property manager (commonly 8–12% of rent) shifts more of that burden off the owner at the cost of reduced margin.