Getting Your Expense Estimates Right
The most common mistake new real estate investors make is underestimating expenses. A property that looks profitable on paper can turn into a cash drain if you miss key cost categories. Accurate expense forecasting is the difference between a deal that builds wealth and one that bleeds money.
This guide covers every expense category you should include when calculating rental property cash flow.
Fixed Operating Expenses
These costs are predictable and occur regardless of occupancy.
Property Taxes
Property taxes are typically the largest single operating expense. Check the county assessor’s website for the current assessed value and tax rate. Budget for annual increases of 1% to 3%.
Insurance
Landlord insurance (also called dwelling fire or DP-3 policy) covers the structure, liability, and loss of rental income. Expect $1,200 to $2,400/year for a single-family rental depending on location, age, and coverage limits. Flood or windstorm riders add cost in applicable zones.
HOA Dues
If the property is in a homeowner’s association, monthly dues are a fixed cost. These can range from $50/month for basic communities to $500+/month for condos with amenities. Always verify what the HOA covers, as some include exterior maintenance, water, or trash.
Variable Operating Expenses
These fluctuate based on occupancy, property condition, and management decisions.
Property Management
Professional management typically costs 8% to 10% of collected rent, plus a tenant placement fee (often 50% to 100% of one month’s rent). Even if you self-manage now, include this line item so your analysis holds if you scale or step back from day-to-day operations.
Maintenance and Repairs
Budget 5% to 10% of gross rent for ongoing maintenance. This covers plumbing repairs, appliance fixes, HVAC servicing, landscaping, and general upkeep. Older properties require a higher reserve.
Capital Expenditures (CapEx)
CapEx covers major replacements: roof ($8,000-$15,000 every 20-25 years), HVAC ($5,000-$10,000 every 15-20 years), water heater ($1,000-$2,000 every 10-12 years), flooring, and appliances. Budget $100-$200/month as a CapEx reserve.
Vacancy
No property stays occupied 100% of the time. Budget 5% to 8% of gross rent for vacancy and turnover costs (cleaning, minor repairs between tenants, re-listing).
Utilities Paid by Landlord
If you cover water, sewer, trash, gas, or electric, include these. Multi-unit properties where utilities cannot be separately metered often leave the landlord responsible for some or all utility costs.
Often-Overlooked Expenses
- Lawn care and snow removal: $50-$200/month depending on property size and climate.
- Pest control: $30-$50/month for regular service.
- Legal and accounting: Eviction costs, lease review, and tax preparation.
- Licensing and permits: Some cities require rental licenses or inspections.
- Advertising costs: Listing fees, photography, and signage for tenant placement.
What to NOT Include in Operating Expenses
When calculating NOI (Net Operating Income), exclude:
- Mortgage payments (principal and interest) — this is debt service, not an operating expense
- Depreciation — this is a tax deduction, not a cash expense
- Income taxes — these depend on your personal tax situation
- One-time capital improvements (use CapEx reserves instead)
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