By Priya Patel | January 7, 2026
One unexpected major repair can wipe out a year of profit. Here's the formula for calculating your emergency reserve and the smartest way to hold it.
The Repair That Ruins Everything
Every landlord has a horror story. The HVAC unit that dies in August. The water heater that floods the basement. The roof that needs full replacement. These events are not if — they're when.
Landlords without reserves face a brutal choice: put it on a credit card at 24% interest, defer the repair (creating habitability issues), or liquidate investments at a bad time. The reserve fund eliminates this choice.
How Much Do You Need?
The 50% Rule of Thumb
A commonly cited rule: budget 50% of gross rent for operating expenses — taxes, insurance, maintenance, vacancy, and management. What's left is your actual net income.
The Reserve Calculation Formula
For each property, maintain:
Maintenance Reserve: 1% of the property's value per year, set aside monthly.
Vacancy Reserve: 1 month of rent per year
Capital Expenditure Reserve: Systems have expected lifespans:
Total monthly reserve for a $1,500 rent property: ~$443/month
Minimum Starting Point
If you're just starting out, build to 3 months of gross rent per property as your immediate target. That's your base