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Rental Property Cash Flow Calculator

Determine the potential monthly profitability of a real estate investment property by accounting for income, operating expenses, and mortgage obligations.

Monthly Income

(Laundry, parking fees, storage, etc.)

Fixed Monthly Expenses

Variable Expense Estimates (%)

These are calculated as a percentage of Gross Monthly Rent.

(Industry standard estimate: 5-8%)
(Typical range: 8-12%. Enter 0 if self-managed)
(Estimate for ongoing upkeep: 5-15%)
(Saving for big replacements like roofs/HVAC: 5-10%)

Understanding Rental Property Cash Flow

Cash flow is the lifeblood of any rental property investment. It represents the net amount of money that moves in or out of your real estate business purely related to property operations after all expenses and mortgage debts are paid. A positive cash flow means your assets are generating income, while negative cash flow means you are paying out of pocket to keep the property running.

How Income is Calculated in Real Estate

While Gross Monthly Rent is the primary source of income, shrewd investors also account for Other Monthly Income. This can include coin-operated laundry machines on-site, rented parking spaces, storage unit fees, or pet fees. The calculator combines these to find your Potential Gross Income.

The Importance of Accounting for "Hidden" Expenses

Many novice investors make the mistake of only subtracting their mortgage, taxes, and insurance from the rent to determine profit. This is dangerous because it ignores the inevitable variable costs of owning property.

This calculator accounts for these critical variable expenses as percentages of your gross rent:

  • Vacancy Rate: You will not collect rent 12 months out of the year, every year. Tenants move out, and it takes time to turn a unit over. A standard conservative estimate is 5% to 8% of gross rent.
  • Property Management: If you hire a professional company to handle tenants and repairs, they typically charge between 8% and 12% of collected rent. If you manage it yourself, you pay with your time, but the financial cost is 0%.
  • Maintenance & Repairs: Things break. To ensure an accurate cash flow projection, you must set aside a percentage of rent (usually 5-15% depending on property age) for ongoing fixes like leaky faucets or appliance repairs.
  • Capital Expenditures (CapEx): Unlike repairs, CapEx refers to major, infrequent replacements like a new roof, HVAC system, or repaving a driveway. Setting aside 5-10% monthly ensures the funds are available when these large bills inevitably arrive.

Interpreting Your Cash Flow Result

The Net Monthly Cash Flow is your "take-home" amount before income taxes. If you input a gross rent of $1,800, other income of $50, and your total fixed and variable expenses amount to $1,550, your positive cash flow is $300 per month. Conversely, if expenses exceed income, you have negative cash flow, indicating the property is currently a liability rather than an income-generating asset.

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