Real Estate Terms for Rental Property Investors

NOI, cap rate, cash flow, cash-on-cash return, DSCR, vacancy and reserves - the vocabulary for analysing, financing and running long-term rentals.

Rental investing comes down to a few numbers - income, expenses, financing and risk - and the terms that define them. This hub collects the vocabulary for analysing, financing and operating long-term rentals.

The journey takes you from screening a listing to holding and eventually exiting, with the decision at each stage.

Start here

Net Operating Income
Net operating income (NOI) is a property's yearly income from rent and other sources minus its operating expenses, before mortgage payments, depreciation and income taxes. It is used when valuing and financing rental property, and matters because cap rate, DSCR and loan size are all calculated from it.
Cap Rate
Cap rate (capitalization rate) is a rental property's net operating income divided by its price or value, shown as a percentage. It is used when comparing income properties or estimating value, and matters because it shows the yield before financing on the same basis for every property.
Cash Flow
Cash flow is the money left over from a rental property's income after paying all operating expenses and debt service — positive cash flow means the property generates more than it costs to run and finance.
Cash-on-Cash Return
Cash-on-cash return is a rental property's annual pre-tax cash flow divided by the total cash invested, such as the down payment, closing costs and initial repairs. It is used when comparing financed investments, and matters because it shows what the investor's own money earns after mortgage payments.
DSCR
DSCR (debt service coverage ratio) is a property's net operating income divided by its annual loan payments. It is used when lenders size or approve rental and commercial loans, including DSCR loans that qualify on property income, and matters because a ratio below 1.0 means the income does not cover the mortgage.
Vacancy Rate
Vacancy rate is the share of time a rental property - or the share of units in a market - sits empty and earns no rent. Investors subtract an expected vacancy allowance from gross rent to estimate realistic income, because even well-run rentals lose some rent between tenants.

Starting rental property investing, step by step

Screen quickly, analyse carefully, and budget for what goes wrong.

  1. STEP 1

    Screen listings quickly

    Rules of thumb filter out deals that cannot work before you spend time on them.

    Your decision: Is this worth a full analysis?

  2. STEP 2

    Build the income statement

    Estimate market rent, vacancy and every operating expense to reach net operating income.

    Your decision: Is NOI based on real numbers or the seller's pro forma?

    Rental cash flow calculator →

  3. STEP 3

    Judge the price

    Cap rate compares the price with the income; compare with similar recent sales.

    Your decision: Is the price supported by the income and the market?

    Cap rate calculator →

  4. STEP 4

    Choose financing

    The loan determines cash flow, cash-on-cash return and how much cash you tie up.

    Your decision: How much leverage can the property carry safely?

  5. STEP 5

    Budget reserves

    Capital items and turnover are certain to come; only the timing is not.

    Your decision: How much will you set aside every month?

  6. STEP 6

    Operate and review

    Track actual income and expenses against the plan every year.

    Your decision: Raise rent, refinance, improve or hold?

  7. STEP 7

    Plan the exit

    Selling triggers taxes and costs; some investors defer gains through an exchange.

    Your decision: Sell, exchange or keep?

All 23 terms

  • 1% RuleIntermediate

    The 1% rule is a quick rental-investing screening test: a property's monthly rent should be at least 1% of its purchase price for the deal to be worth a closer look.

  • BRRRR (buy, rehab, rent, refinance, repeat) is a rental investing strategy: buy a property that needs work, renovate it, rent it out, then refinance at the higher value to recover cash for the next purchase. It matters because it can recycle capital, but only if the appraisal and the rent support the new loan.

  • Buy and HoldIntermediate

    Buy and hold is a long-term investment strategy where an investor purchases a rental property and holds it for years, earning income from rent and building wealth through appreciation and equity.

  • Cap rate (capitalization rate) is a rental property's net operating income divided by its price or value, shown as a percentage. It is used when comparing income properties or estimating value, and matters because it shows the yield before financing on the same basis for every property.

  • A CapEx reserve is money set aside from rental income to cover eventual big-ticket replacements — roof, HVAC, water heater — that don't happen every year but are certain to happen eventually.

  • Cash FlowIntermediate

    Cash flow is the money left over from a rental property's income after paying all operating expenses and debt service — positive cash flow means the property generates more than it costs to run and finance.

  • Cash-on-cash return is a rental property's annual pre-tax cash flow divided by the total cash invested, such as the down payment, closing costs and initial repairs. It is used when comparing financed investments, and matters because it shows what the investor's own money earns after mortgage payments.

  • Debt ServiceIntermediate

    Debt service is the total amount of principal and interest owed on a loan over a given period, most often expressed as an annual figure in real estate investment analysis.

  • DSCR (debt service coverage ratio) is a property's net operating income divided by its annual loan payments. It is used when lenders size or approve rental and commercial loans, including DSCR loans that qualify on property income, and matters because a ratio below 1.0 means the income does not cover the mortgage.

  • The Fair Housing Act is the federal law prohibiting discrimination in housing sales, rentals, and financing based on race, color, national origin, religion, sex, familial status, or disability.

  • The gross rent multiplier (GRM) is a quick screening ratio that divides a property's price by its gross annual rent, before any expenses. A lower GRM means more rent per dollar of price, but because it ignores vacancy and operating costs, it only ranks listings for a closer look.

  • Gross rental income is a property's total rental income before subtracting vacancy, operating expenses, or debt service — the starting point for calculating NOI.

  • House HackingIntermediate

    House hacking means buying a multi-unit or single-family property, living in part of it, and renting out the rest — using rental income to offset or fully cover the owner's own mortgage payment.

  • LeverageIntermediate

    Leverage means using borrowed money (a mortgage) to control a larger asset than an investor could afford with cash alone — it can amplify both returns and losses.

  • Net operating income (NOI) is a property's yearly income from rent and other sources minus its operating expenses, before mortgage payments, depreciation and income taxes. It is used when valuing and financing rental property, and matters because cap rate, DSCR and loan size are all calculated from it.

  • Operating ExpensesIntermediate

    Operating expenses are the recurring costs of running a rental property - property taxes, insurance, repairs and maintenance, management fees, owner-paid utilities and similar costs. They are subtracted from rental income to calculate net operating income and never include mortgage payments, depreciation or capital improvements.

  • A property management fee is what a landlord pays a property manager to handle leasing, rent collection, maintenance coordination, and tenant issues, typically 8-12% of monthly collected rent.

  • Rent ControlIntermediate

    Rent control refers to local laws limiting how much and how often a landlord can raise rent on existing tenants, and in some jurisdictions restricting eviction reasons.

  • Rental YieldIntermediate

    Rental yield measures a property's annual rental income as a percentage of its value or purchase price — similar to cap rate, but sometimes calculated using gross income rather than NOI.

  • Section 8 is a federal rental assistance program where the government pays a portion of a qualifying tenant's rent directly to a participating landlord.

  • A short-term rental is a property rented out for brief stays — typically under 30 days, as on Airbnb or Vrbo — as opposed to a traditional lease, often generating higher nightly income but with more variable occupancy and higher management effort.

  • Turnkey RentalIntermediate

    A turnkey rental is a fully renovated, already-tenanted (or rent-ready) investment property sold with the intent that a buyer can start collecting rent with minimal additional work — often paired with third-party property management.

  • Vacancy RateIntermediate

    Vacancy rate is the share of time a rental property - or the share of units in a market - sits empty and earns no rent. Investors subtract an expected vacancy allowance from gross rent to estimate realistic income, because even well-run rentals lose some rent between tenants.

Common mistakes

  • Using the seller's rent and expense figures without checking them.
  • Leaving out vacancy and capital reserves, which flatters every deal.
  • Comparing a cap rate with a cash-on-cash return.
  • Borrowing so much that a single vacancy turns cash flow negative.
  • Ignoring the tax reassessment that can follow a purchase.

Practical examples

Strong NOI, weak cash flow

A rental can show healthy net operating income and still lose money each month if the mortgage payment exceeds it. Check both numbers.

A higher cap rate is not free return

Two properties at the same price can show very different cap rates because one has higher vacancy and an old roof. The market is pricing that risk.

Comparisons and common questions

Calculators and guides

Frequently asked questions

What numbers matter most for a rental property?

Net operating income, cap rate, cash flow after reserves, cash-on-cash return and DSCR. Together they show whether the price, the financing and the operations work.

How much cash do I need to buy a rental?

Investment property loans usually need larger down payments than home loans, plus closing costs and cash reserves for vacancy and repairs. Ask lenders for their requirements.

Should I manage my rental myself?

It depends on your time, distance and skills. Budget a management fee even if you self-manage, so the numbers still work if you hire help later.

Explore more of the glossary

Definitions are provided for general educational purposes and are not financial, legal, tax, or real estate advice. Rules vary by transaction and location - verify important decisions with qualified professionals.