Rental Cashflow Calculator
Analyze monthly and annual cashflow for any rental property. Enter income, expenses, mortgage, and reserves to see net operating income, cashflow per unit, operating expense ratio, and a full expense breakdown — free, private, and instant.
This rental cashflow calculator is a free, browser-based tool that shows landlords the monthly and annual cash a rental property actually produces after every expense. Enter rent, taxes, insurance, management, reserves and mortgage — it returns net operating income, cashflow per unit and the operating expense ratio in one pass.
How Rental Property Cashflow Works
Rental property cashflow is the money left over each month after collecting rent and paying every expense tied to the property. A positive cashflow means the property generates income beyond its costs, while negative cashflow means the landlord subsidizes the investment from other income sources. According to the U.S. Census Bureau's American Housing Survey, the national rental vacancy rate hovers around 6-7%, making vacancy reserves a critical part of any cashflow projection.
To calculate monthly cashflow, start with gross rental income plus any ancillary revenue (parking, laundry, pet fees). Subtract operating expenses — property taxes, insurance, HOA, property management fees, maintenance reserves, vacancy reserves, utilities, and miscellaneous costs. The result before mortgage payments is your Net Operating Income (NOI). Subtract the monthly mortgage principal and interest payment from NOI to arrive at your monthly cashflow.
Key Metrics for Cashflow Analysis
Beyond the raw monthly cashflow number, experienced investors track several ratios. The Operating Expense Ratio (OER) measures total operating expenses divided by effective gross income — a ratio below 40% is considered efficient for most single-family rentals, while multifamily properties typically run 45-55% according to the National Apartment Association. Net Operating Income (NOI) excludes debt service and shows property-level profitability independent of financing. Cashflow per unit normalizes results across different property sizes — investors often target at least $100-200 per unit per month as a minimum threshold.
The Consumer Financial Protection Bureau (cfpb.gov) recommends that landlords maintain reserves equal to at least 3-6 months of operating expenses to handle unexpected vacancies or major repairs without financial distress.
Common Expense Ratios for Landlords
Property management fees typically range from 8-12% of collected rent for residential properties. Maintenance reserves of 5-10% of gross rent cover routine repairs, while capital expenditure reserves (1-2% of property value annually) handle major replacements like roofing, HVAC systems, and appliances. Vacancy reserves of 5-8% account for turnover periods between tenants. Insurance costs vary significantly by location — flood zones and hurricane-prone areas may see premiums 3-5x higher than inland properties.
Property taxes represent the largest fixed expense for most landlords. Rates range from under 0.5% of assessed value in Hawaii to over 2% in New Jersey and Illinois. Investors should verify current mill rates with the local assessor's office rather than relying on listing estimates, which may reflect previous owner exemptions (homestead, senior, veteran) that do not transfer to investment properties.
Rental Cashflow Calculator: Quick 5-Field Workflow
This rental cashflow calculator runs entirely in your browser — no sign-up, no data stored on a server. Enter monthly rent, mortgage payment (principal + interest only), and three percentages (property management %, maintenance reserve %, vacancy reserve %). The calculator auto-applies fixed costs (taxes, insurance, HOA) and returns monthly cashflow, annual cashflow, and operating expense ratio in under a second. The Consumer Financial Protection Bureau (CFPB) recommends running cashflow analysis on EVERY rental — pre-purchase, at refinance, and annually — to catch drift in expenses before a property turns negative. Bookmark the page; auto-save restores your last numbers next visit.
The 1% Rule and 50% Rule: Quick Cashflow Screens
Before you run a full cashflow calculator on a property, two back-of-napkin rules tell you whether the deal is even worth modeling. The 1% Rule says monthly gross rent should equal at least 1% of purchase price (a $200,000 house should rent for $2,000/month). Properties that hit 1% almost always cash-flow positively after expenses; properties that miss it usually rely on appreciation. The 50% Rule assumes long-run operating expenses (excluding mortgage) will consume roughly 50% of gross rent — so monthly cashflow ≈ (gross rent ÷ 2) − mortgage payment. Both rules are pessimistic by design: they bake in vacancy, maintenance, capex, management, and the surprises landlords learn about year three. Use them to triage listings, then run this rental cashflow calculator on the survivors. Per IRS Publication 527, capital expenditures (roof, HVAC, appliances) are depreciated separately from operating expenses on Schedule E, which is why our calculator and the 50% Rule both keep capex out of OER and into a reserve line.
Rental Cashflow Calculator vs DSCR: What Lenders Actually Score
A rental cashflow calculator answers "does this property pay me every month?" but investment lenders answer a different question: "does it pay the loan?" That is the Debt Service Coverage Ratio (DSCR) — Net Operating Income divided by annual mortgage payments (P+I). Most DSCR loan programs require ≥ 1.25 to fund, meaning the property must generate at least $1.25 of NOI for every $1 of debt payment. A property with $18,000 NOI and $14,400 annual mortgage payments has a DSCR of 1.25 — right at the line. Two takeaways for cashflow modeling: (1) enter your mortgage P&I above and the calculator now returns your DSCR as a result card next to NOI, flagged against the 1.25 lender minimum, so you can preview how an underwriter will score the deal before you apply; (2) if DSCR is below 1.25, either raise rent to market, refinance to a lower rate, or move on — no amount of "management efficiency" fixes a debt-service gap. Per the CFPB's ability-to-repay framework, DSCR-based underwriting on investment property is standard and the 1.25 minimum has held since 2015. Updated 2026-07-31.
Frequently Asked Questions
What is a good monthly cashflow for a rental property?
Most real estate investors target at least $100-200 per unit per month in positive cashflow. Properties in high-appreciation markets (coastal cities) may cash-flow less but gain equity faster, while Midwest and Southern markets often yield $200-400+ per unit. The right target depends on your investment strategy — cashflow-focused or appreciation-focused.
What is Net Operating Income (NOI)?
NOI is your total rental income minus all operating expenses, but before mortgage payments. It measures the property's profitability independent of how you financed it. Lenders use NOI to calculate the Debt Service Coverage Ratio (DSCR). A higher NOI means the property can support more debt or generate more cashflow.
What operating expense ratio is normal for rental properties?
Single-family rentals typically have operating expense ratios of 35-45% of effective gross income. Multifamily properties run 45-55% due to common area maintenance, on-site staff, and higher insurance costs. An OER above 60% signals potential management inefficiency or deferred maintenance issues that need investigation.
Should I include vacancy reserves even if my property is occupied?
Yes. Vacancy reserves account for the statistical certainty that tenants will eventually move out. The U.S. Census Bureau reports a national vacancy rate of approximately 6-7%. Prudent investors budget 5-8% of gross rent for vacancy, even during periods of full occupancy, to build reserves for turnover costs and lost rent between tenants.
How does property management percentage affect cashflow?
Property management fees typically range from 8-12% of collected rent. On a $2,000/month rental, a 10% management fee costs $200/month or $2,400/year. Self-managing eliminates this cost but requires your time for tenant screening, maintenance coordination, rent collection, and legal compliance. Many investors self-manage their first 1-4 units before hiring a manager.
What expenses are NOT included in operating expenses?
Operating expenses exclude mortgage principal and interest (debt service), capital expenditures (roof replacement, major HVAC), income taxes, and depreciation. These items affect your total return but are separated from NOI to allow apples-to-apples property comparison regardless of financing structure or tax situation.
Is this rental cashflow calculator free?
Yes — fully free, no sign-up, no email needed, no usage cap. The tool runs entirely in your browser, so the numbers you enter never leave your device. You can re-run scenarios as many times as you want, share a link with your business partner or lender, and bookmark for next year's update. There is no premium tier.
How accurate is a rental cashflow estimate before buying?
It is as accurate as the inputs. For pre-purchase analysis, use conservative numbers: assume the listing rent is 10% above true market rent, vacancy at 8% (not 5%), maintenance at 8-10% (not 5%) for properties over 20 years old, and verify property taxes with the county assessor — listings often show the previous owner's rate after homestead exemption, which does not transfer to investors. The CFPB recommends a margin-of-safety stress test where rent drops 10% and expenses rise 10%.
What is the 1% Rule in rental cashflow analysis?
The 1% Rule says monthly gross rent should be at least 1% of the all-in purchase price. A $200,000 property should rent for $2,000/month or more to pass. It is a triage screen, not a full analysis — properties that hit 1% usually cash-flow positively, but you still need to run a calculator with real taxes, insurance, and HOA before buying. In high-appreciation coastal markets, very few properties hit 1% and investors accept this in exchange for equity growth.
What is the 50% Rule for rental properties?
The 50% Rule assumes long-run operating expenses (excluding mortgage) will consume roughly 50% of gross monthly rent. So monthly cashflow ≈ (gross rent ÷ 2) − mortgage payment. It bakes in vacancy, maintenance, management, capex reserves, and the surprises landlords meet by year three. It is intentionally pessimistic — real numbers may be 40-45% on newer single-family rentals — but it stops investors from buying based on an unrealistically lean expense projection.
How is a rental cashflow calculator different from a DSCR calculator?
A rental cashflow calculator shows what YOU take home each month after every expense including mortgage. A DSCR calculator shows what the LENDER cares about: NOI divided by annual mortgage payment. You can have a property with strong DSCR (1.5+) but weak cashflow if you put down too little, or a property with excellent cashflow but poor DSCR if there is a personal loan on top of the mortgage. Investors need both — cashflow for lifestyle, DSCR for refinancing and portfolio growth.
What DSCR does a rental cashflow calculator help you target?
Most non-QM investment loan programs require DSCR ≥ 1.25 to fund, with 1.30–1.40 required for lower interest tiers. Some programs will fund at 1.00 with a rate premium but that leaves zero margin for vacancy or repairs. Practical target: run this calculator, take the annual NOI (cashflow before mortgage), divide by planned annual P+I payments. If the result is below 1.25 you will either not get the loan or pay a higher rate — either raise rent, lower purchase price, or increase down payment before applying.