Cash Flow Calculator

What Rental Property Cash Flow Means

Cash flow is the money left over each month after collecting rent and paying all expenses and the mortgage. Positive cash flow means the property generates income beyond its costs. Negative cash flow means you are paying out of pocket each month to hold the property. For most buy-and-hold rental investors, consistent positive cash flow is the primary goal because it provides income, builds reserves for repairs, and reduces dependence on appreciation for returns.

Cash flow is calculated by starting with effective rental income (gross rent minus vacancy), subtracting all operating expenses, and then subtracting the mortgage payment. The result is the amount deposited into or withdrawn from your bank account each month as a direct result of owning the property.

How This Calculator Works

This calculator walks through cash flow in three steps. First, enter your rental income: monthly rent per unit, number of units, any other income, and the expected vacancy rate. The calculator subtracts vacancy loss from gross income to produce effective income. Second, enter monthly operating expenses: property tax, insurance, maintenance, management fees, HOA, and other costs. The total is subtracted from effective income to produce net operating income. Third, enter your mortgage payment. Subtracting the mortgage from NOI gives your monthly cash flow.

The cash-on-cash return divides annual cash flow by total cash invested, giving you the percentage return on the actual dollars you put into the deal. This is the most practical return metric for leveraged investors because it measures the yield on your out-of-pocket investment rather than the full property value.

Understanding Cash-on-Cash Return

Cash-on-cash return answers the question: what annual percentage return am I earning on the cash I invested? If you invested $60,000 in down payment, closing costs, and initial repairs, and the property generates $3,600 per year in cash flow, your cash-on-cash return is 6%. This metric is specific to leveraged purchases and differs from cap rate, which measures returns on the full property value without regard to financing.

Most buy-and-hold investors target 6% to 10% cash-on-cash return as a minimum. Returns above 10% are considered strong. Returns below 6% suggest the property is generating modest income relative to the capital tied up in it. Negative cash-on-cash returns indicate the property is losing money on a cash basis, though the investor may still benefit from principal paydown, tax advantages, and appreciation.

DSCR and Why Lenders Care About It

Debt service coverage ratio divides net operating income by the mortgage payment. A DSCR of 1.25x means the property generates 25% more income than needed to cover the mortgage. Most investment property lenders require a minimum DSCR of 1.20x to 1.25x. A DSCR below 1.0x means the property cannot cover its own mortgage from operating income, which is a red flag for lenders and indicates negative cash flow for the investor.

DSCR is particularly important for investors using DSCR loans, which qualify borrowers based on the property's income rather than personal income. These loans typically require a minimum 1.0x to 1.25x DSCR and offer higher rates in exchange for simpler qualification. This calculator shows DSCR alongside cash flow so you can evaluate both your personal cash flow and the property's qualification for investment financing.

Building in a Cash Flow Cushion

Experienced investors target at least $200 per month per unit in cash flow as a minimum cushion. Properties with less than $200 per month leave little room for unexpected repairs, insurance increases, property tax reassessments, or extended vacancies. A single major repair like a water heater or HVAC unit can wipe out an entire year of thin cash flow.

To improve cash flow on a deal, focus on the largest expense line items: mortgage payment, property taxes, and vacancy rate. Negotiating a lower purchase price directly reduces the mortgage payment. Challenging a property tax assessment can lower the monthly tax burden. Reducing turnover through tenant retention strategies decreases effective vacancy and the cost of re-leasing.

Frequently Asked Questions

What is good cash flow on a rental property?

At least $200 per month per unit after all expenses and mortgage is a common target. This provides a cushion for unexpected costs. Less than $100 per month is considered thin and leaves minimal margin for error.

What is cash-on-cash return?

Annual cash flow divided by total cash invested (down payment, closing costs, initial repairs). If you invest $60,000 and earn $3,600 per year in cash flow, the cash-on-cash return is 6%. Most investors target 6 to 10 percent or higher.

What is included in operating expenses?

Property taxes, insurance, maintenance and repairs, property management fees, HOA dues, utilities paid by the owner, and any other recurring costs. Mortgage payments are not operating expenses because they are debt service, not operating costs.

What is DSCR and why does it matter?

Debt service coverage ratio divides NOI by the mortgage payment. Lenders typically require 1.20 to 1.25x minimum. DSCR below 1.0x means the property does not generate enough income to cover its mortgage from operations alone.

Should I include a management fee if I self-manage?

Including a management fee even when self-managing gives a more conservative analysis. If you ever stop self-managing, the fee becomes a real expense. Using 0% shows your actual current cash flow, while 8 to 10 percent shows what cash flow would look like with professional management.

How does vacancy rate affect cash flow?

Each percentage point of vacancy reduces your effective income. At $1,800 per month rent, a 5% vacancy rate costs $90 per month or $1,080 per year. Higher vacancy directly reduces cash flow, NOI, DSCR, and cash-on-cash return.