Glossary of Rent-vs-Buy Terms

Every term you need to understand the rent-vs-buy calculator and the guides on this site, explained in plain language.

Amortization

The process of gradually paying off a loan through regular payments. With a standard 30-year mortgage, each monthly payment covers both interest and a portion of the principal. In the early years, most of the payment goes toward interest; over time, the balance shifts toward principal. An amortization schedule shows exactly how much of each payment goes to interest vs. principal.

Appreciation

The increase in a home's market value over time, typically expressed as an annual percentage. U.S. home prices have appreciated roughly 3–4% per year in nominal terms historically (per the Case-Shiller index tracked on FRED), though individual markets vary dramatically. After accounting for inflation, real appreciation has been closer to 1–2% annually.

Break-Even Point

In the rent-vs-buy context, the year at which the buyer's cumulative net wealth first exceeds the renter-who-invests's cumulative net wealth. Before the break-even year, renting-and-investing has the edge; after it, buying does. See our full guide: The Break-Even Point Explained.

Capital Gains Exclusion (Section 121)

A federal tax provision allowing homeowners to exclude up to $250,000 (single filers) or $500,000 (married filing jointly) of capital gains from the sale of their primary residence, provided they've lived in the home for at least 2 of the last 5 years. This is a significant tax benefit of homeownership that has no equivalent for renters. For details, see IRS Topic 701.

Closing Costs

Fees and expenses paid at the time of purchasing a home, typically 2–5% of the purchase price. Includes lender fees, appraisal, title insurance, attorney fees, transfer taxes, and prepaid escrow amounts. These costs are largely non-recoverable upfront and must be recouped through appreciation or principal paydown before the buyer comes out ahead.

Down Payment

The portion of the home's purchase price paid in cash upfront, with the remainder financed through a mortgage. A 20% down payment ($100,000 on a $500,000 home) avoids PMI and reduces monthly payments. Lower down payments (3–10%) allow earlier entry into the market but increase monthly costs.

Equity

Your ownership stake in the home: home value minus remaining mortgage balance. Equity builds through principal paydown and appreciation. It's real wealth but illiquid — you must sell the home, refinance, or take out a home equity loan to access it.

HOA (Homeowners Association)

An organization in a condo, townhouse, or planned community that manages shared spaces and enforces community rules. Members pay monthly or annual dues covering maintenance of common areas, insurance on shared structures, and sometimes utilities. HOA fees range from $100 to over $1,000/month depending on the community and its amenities.

Itemized Deduction vs. Standard Deduction

When filing federal taxes, you can either take a flat "standard deduction" or "itemize" by listing specific deductible expenses (mortgage interest, state and local taxes up to $10,000, charitable contributions, etc.). Since the 2017 Tax Cuts and Jobs Act, most households take the standard deduction because it exceeds the sum of their itemizable expenses. If you don't itemize, the mortgage interest deduction provides no tax benefit.

Opportunity Cost

The return you give up by choosing one investment over another. In rent-vs-buy, the opportunity cost of buying is the return you could have earned by investing your down payment (and the monthly savings from renting a cheaper place) in the stock market or other assets instead.

PMI (Private Mortgage Insurance)

Insurance required by conventional lenders when the buyer puts less than 20% down. It protects the lender — not the buyer — against default. PMI typically costs 0.5–1.5% of the loan amount per year. It can be canceled once the buyer reaches 20% equity.

Price-to-Rent Ratio

Home price divided by annual rent for a comparable property. A ratio of 20 means you pay 20 times the annual rent to buy. Ratios below 15 tend to favor buying; above 20 tend to favor renting; in between is market- and situation-dependent.

Principal

The outstanding balance on a mortgage loan — the amount you actually borrowed, excluding interest. Each mortgage payment reduces the principal by a small amount (with amortization, the reduction is small at first and grows over time). Your equity increases as principal decreases.

Property Tax

An annual tax assessed by local governments on real property value, typically 0.3–2.2% of the assessed value per year depending on location. Property taxes are paid by homeowners (usually via an escrow account held by the lender) and are generally deductible up to the $10,000 SALT cap when itemizing federal taxes.

Selling Costs

Costs incurred when selling a home, typically 5–8% of the sale price. Includes real estate agent commissions (often 5–6%), repairs, staging, transfer taxes, and legal fees. These must be factored into break-even calculations — the appreciation on your home must cover both what you paid to buy and what you'll pay to sell before you net a profit.

Time Horizon

How long you plan to stay in the home. The most important single variable in the rent-vs-buy decision. Short time horizons favor renting (transaction costs don't get amortized over enough years); long time horizons favor buying (fixed mortgage costs become increasingly attractive as rents rise).

Wealth Delta

The difference in projected net wealth between the buyer and the renter-who-invests at a given point in time. A positive wealth delta means buying has built more wealth; a negative delta means renting-and-investing has. The calculator plots this over your time horizon so you can see how the advantage evolves year by year.