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Rental Income Calculator 2026 Free - Property Cash Flow & ROI

Analyze the real profitability of your real estate investment. Calculate NOI, cash flow, and key metrics like Cap Rate and Cash-on-Cash Return for informed decisions.

Fast estimateClear assumptionsNext step ready

Planning tip: Professional investors focus on NOI and Cash-on-Cash returns, not just gross rental yield. The 1% rule is outdated in today's market.

Quick answer: rental profit is rent minus all operating costs

Look beyond gross rent. Include vacancy, repairs, management, taxes, insurance, HOA, and debt service before judging cash flow.

NOI
Rent - operating expenses
Cash flow
NOI - mortgage payment
Risk buffer
Vacancy and repairs matter
Use the calculator

Financial Calculator

Free financial calculator to help you make informed decisions about your money.

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How to use this calculator: Enter your financial information in the fields above. Results update automatically as you type. All calculations are performed locally in your browser - we never store or share your personal financial data.

⚠️ For Planning Purposes Only

These calculations are estimates for educational and planning purposes. Always consult with qualified financial professionals before making investment decisions.

▼ View Full Disclaimers & Data Sources

Market Variability: Rental rates, vacancy rates, and operating expenses vary significantly by location, property type, and market conditions.

Hidden Costs: Calculator may not include all costs such as capital improvements, legal fees, eviction costs, or major repairs.

Tax Implications: Rental income is taxable. Consult tax professionals for depreciation, deductions, and tax strategy optimization.

Market Risk: Real estate values and rental demand can fluctuate. Past performance doesn't guarantee future results.

  1. 1

    Enter property details

    Number of units and rent per unit.

  2. 2

    Set vacancy rate

    Expected percentage of time units are vacant.

  3. 3

    Add operating expenses

    All costs to operate the property.

  4. 4

    Calculate net income

    See your gross and net operating income.

How the Math Works

  • The calculator converts your inputs into monthly and annual totals, then applies category-specific formulas for Rental Income.
  • Intermediate values are rounded for display, but calculations preserve precision until final totals are shown.
  • Scenario outputs compare baseline values against changed inputs so you can estimate tradeoffs quickly.

Assumptions

  • Inputs are treated as stable over the time period you select.
  • Rates and costs are assumed to remain constant unless you model a change manually.
  • Results are planning estimates, not a lender quote, tax filing output, or legal advice.

Worked Examples

Base scenario

Use your current numbers to establish a realistic rental income baseline.

This gives you a reference point for every change you test next.

Conservative scenario

Increase key costs by 10% and reduce expected upside by 10%.

If the result still works, your plan likely has a practical safety margin.

Optimized scenario

Adjust one or two controllable levers (rate, payment, timeline, or contribution).

Compare whether the gain is meaningful enough to justify the extra effort.

When This Estimate Breaks

  • Your actual numbers can differ when taxes, fees, policy rules, or market pricing change.
  • Large life changes (income shifts, relocation, new debt, job changes) can invalidate assumptions quickly.
  • Use this estimate with real quotes/statements before making a final financial decision.

Methodology and Editorial Review

  • The model computes a baseline from your entered inputs, then recalculates results for each scenario change.
  • Displayed values are rounded for readability while internal calculations keep precision until output formatting.
  • Editorial review validates formula consistency, assumptions, and user-facing interpretation text.

Author: Affordably Editorial Team

Financial review: Affordably Financial Review Team

Related Resources

Explore this topical cluster: Personal Finance Planning

How Rental Income Calculator Works

Calculate your net rental income after all expenses to understand the true profitability of a rental property. This calculator accounts for vacancy, maintenance, property management, taxes, insurance, and mortgage to show actual cash flow.

1

Enter Monthly Rent

Input the gross monthly rent you charge (or expect to charge). Research comparable rentals in the area to ensure your rent is competitive.

2

Factor in Vacancy Rate

Assume 5-10% vacancy for tenant turnover and finding new renters. Even great properties have gaps between tenants. 8.33% = 1 month vacant per year.

3

Add Operating Expenses

Include property taxes, insurance, HOA fees, property management (8-10% of rent if using one), and utilities you cover.

4

Include Maintenance Reserve

Budget 1-2% of property value annually for repairs and capital expenditures. Older properties need more. This is often underestimated by new investors.

5

Subtract Mortgage Payment

Include principal, interest, and any escrow for taxes/insurance. This is your largest expense if financed.

6

Calculate Net Cash Flow

Gross rent minus all expenses equals your actual monthly cash flow. Positive cash flow means the property pays you; negative means you subsidize it.

Key Factors Considered:

  • ✓Gross rental income potential
  • ✓Vacancy and collection loss
  • ✓Property taxes and insurance
  • ✓Property management fees
  • ✓Maintenance and capital expenditures
  • ✓Mortgage payment (if financed)
  • ✓HOA fees (if applicable)
  • ✓Utilities paid by owner vs tenant

Why Calculate Rental Income Accurately

  • Know true cash flow before buying a rental property
  • Avoid overpaying for properties that won't cash flow
  • Set rent at profitable levels
  • Budget accurately for expenses
  • Compare multiple property opportunities
  • Make data-driven investment decisions
  • Identify hidden costs that kill profitability
  • Plan for maintenance and capital expenditures

Key Terms to Know

Gross Rental Income
Total rent collected if property is 100% occupied all year. Starting point for cash flow analysis. Rarely actually achieved due to vacancy.
Net Operating Income (NOI)
Gross income minus operating expenses (not including mortgage). NOI divided by property price = cap rate. Key metric for comparing properties.
Cash Flow
Money remaining after all expenses including mortgage. Positive cash flow = property pays you. Goal: $100-300+ per door per month.
Cap Rate
Capitalization rate = NOI ÷ property price. Measures return if you paid cash. Higher cap rate = higher return but often higher risk. 5-10% is typical.
Vacancy Rate
Percentage of time property is unoccupied. National average ~6%. Budget 8-10% to be conservative. Location and property type affect this.
50% Rule
Quick estimate that 50% of gross rent goes to expenses (excluding mortgage). Useful for fast analysis but verify with actual numbers.

Pro Tips

  • →The 1% rule: monthly rent should be at least 1% of purchase price for cash flow
  • →Never rely on appreciation alone - buy for cash flow, appreciation is bonus
  • →Vacancy kills returns - budget 8-10% even in hot markets
  • →Maintenance reserve: 10% of rent minimum, more for older properties
  • →Property management: even if self-managing, calculate as if paying 10%
  • →Don't forget capex: roof, HVAC, water heater replacements come eventually
  • →Research actual rents in area (Zillow, Rentometer) before buying
  • →House hack (live in one unit) to reduce or eliminate housing costs
  • →Cash-on-cash return matters more than cap rate for leveraged purchases
  • →Build 6-month expense reserve before counting profits

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Last updated: May 31, 2026

Frequently Asked Questions - Rental-income

What is NOI in rental properties?

NOI (Net Operating Income) is total rental income minus all operating expenses. It does NOT include mortgage payments, depreciation, amortization, or income taxes. It's the most important metric for evaluating operational profitability of properties.

What operating expenses should I include exactly?

Operating expenses include: property taxes, property insurance, maintenance & repairs, property management (8-12% of income), HOA/condo fees, owner-paid utilities, advertising/marketing, accounting, legal fees, capital reserves (5-10% of income), and vacancy allowance.

What's a good vacancy rate by market?

Vacancy rates vary by market: A Markets (NYC, SF, LA): 3-7%. B Markets (Austin, Nashville): 5-10%. C Markets (smaller cities): 8-15%. Class A properties: 5-8%. Class B: 7-12%. Class C: 10-20%. Consider seasonality, tenant turnover, and local economic conditions.

How do I calculate after-tax cash flow?

After-tax cash flow = NOI - mortgage payments - capital reserves - income taxes + depreciation benefits. Residential depreciation is 27.5 years in US. Example: $275k property = $10k annual depreciation. In 24% tax bracket, you save $2,400 in taxes.

What is Cap Rate vs Cash-on-Cash Return?

Cap Rate = NOI ÷ Purchase price (no financing). Measures operational yield. Cash-on-Cash Return = Annual cash flow ÷ Cash invested (with financing). Example: $100k property, $8k NOI, $20k cash, $3k flow. Cap Rate = 8%. Cash-on-Cash = 15%. Leverage improves Cash-on-Cash but increases risk.

When is a rental property investment profitable?

Property is profitable when: 1) Positive cash flow after ALL expenses. 2) Cap Rate >6% in B/C markets, >3% in A markets. 3) Cash-on-Cash Return >8-12%. 4) 1% Rule: monthly rent ≥ 1% of purchase price. 5) Debt Service Coverage Ratio >1.25. Also consider appreciation, tax benefits, and portfolio diversification.

What is the BRRRR strategy?

BRRRR = Buy, Rehab, Rent, Refinance, Repeat. Buy property at discount, renovate to increase value, rent it out, refinance based on new value (pull out initial investment), repeat process. Allows rapid portfolio scaling but requires experience, capital, and markets with spread between purchase price and ARV (After Repair Value).

How do I analyze different real estate markets?

Analyze markets by: 1) Population and job growth. 2) Economic diversification (avoid single-industry cities). 3) Price-to-rent ratios and cap rates. 4) Tenant regulations (CA/NY more restrictive). 5) State and local taxes. 6) Barriers to entry (costs, regulations). A Markets: low yield, high appreciation. C Markets: high yield, low appreciation.

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How These Results Are Calculated

Each calculator uses standard financial formulas and explicit assumptions to generate educational estimates. Results are based on your inputs and may vary based on rates, taxes, fees, and local market conditions.

  • Public data sources include the IRS, BLS, Census, Federal Reserve, and state agencies.
  • Calculators are reviewed periodically to reflect market and tax-rule changes.
  • These results do not replace personalized professional advice.
GA
Reviewed by the Founder of GetAffordably

This content was created with AI assistance and reviewed by the founder of GetAffordably. Financial data is sourced from the U.S. Census Bureau, Federal Reserve, IRS, and other public records, and is verified periodically.

Last updated: May 2026
Rental Income Calculator | Calculate Property Cash Flow