Landlord Expense Calculator

Last updated July 2, 2026

Rental property ownership involves ongoing expenses that most first-time landlords underestimate because they focus on visible costs — mortgage, taxes, and insurance — while underweighting the variable and irregular costs that accumulate over time. The major expense categories that require systematic budgeting are: property taxes, landlord insurance, property management fees (typically 8 to 12 percent of monthly rent for full-service management), maintenance and repairs, capital expenditures (roof, HVAC, water heater replacements), vacancy allowance, and advertising and tenant acquisition costs.

The capital expenditure reserve is the most commonly neglected item in rental property budgeting. Every major building system has a finite lifespan and an eventual replacement cost: roofs last 20 to 30 years and cost $8,000 to $20,000 to replace; HVAC systems last 15 to 20 years and cost $5,000 to $12,000; water heaters last 8 to 12 years at $800 to $1,500. Allocating a monthly CapEx reserve — typically 5 to 10 percent of gross rent, or $100 to $200 per month on most single-family rentals — prevents the shock of major unexpected expenses from turning a profitable investment into a cash crisis. The 50 percent rule already accounts for this at a high level, but explicit line-item budgeting for each category produces more accurate projections and identifies when the CapEx reserve is inadequate for the property's age and system condition.

Budgeting landlord expenses by category — not by the 50 percent rule alone — and include an explicit capital expenditure reserve based on the age and remaining lifespan of major building systems. For a property with systems approaching end of life, the monthly CapEx reserve may need to exceed 15 percent of gross rent to adequately fund replacement cycles. Underestimating these costs is the primary reason that rental properties that look profitable on a gross rent basis are not profitable in practice.