Mortgage vs Rent Lifetime Calculator

How the Buy vs Rent Math Really Works

Rent does not build equity, so each rent payment leaves permanently. A mortgage payment splits into interest (a cost) and principal (which builds equity as the loan is paid down). Home value appreciation adds further wealth that renters don't capture. Buying also carries upfront costs (deposit, transaction fees) and ongoing costs (maintenance, property taxes, insurance). The deposit could otherwise have been invested; this calculator captures that opportunity cost by growing the renter's invested deposit over time. The long-run comparison weighs these streams across decades.

What Tips the Balance

Low rent versus mortgage payment: renting wins short-term. High property appreciation: buying wins long-term. Short ownership periods (under 5-7 years): renting often wins due to transaction costs. Long ownership (20+ years): buying usually wins due to equity buildup and mortgage payoff. Rent inflation: high inflation favors buying since mortgage payments are fixed while rent grows. Low mortgage rates: buying wins. High rates: renting more competitive. The calculator handles all these variables.

Worked Example for Typical Decision

Property 300,000. Deposit 20% (60,000). Mortgage 5% over 25 years. Monthly rent 1,500. Compare 30 years. Appreciation 3%. Rent inflation 3%. Investment return 7%. The monthly mortgage is about 1,403, below the starting rent, and after year 25 the loan is repaid, so the buyer's housing cost drops to zero while rent keeps rising. The home is worth about 728,000 at year 30, all of it equity since the loan is gone. The renter invests the 60,000 deposit, which grows to about 457,000. Counting the surplus each side invests when its housing is cheaper, the buyer's net worth reaches roughly 1,627,000 against the renter's 457,000, so buying ends ahead by about 1,170,000 under these assumptions.

What the Calculator Does Not Model

Maintenance costs (typically 1-2% of property value annually). Property taxes, insurance, and service charges which rent typically includes. Transaction costs (property transfer taxes, legal fees, agent fees) typically 3-8% of purchase. Flexibility value of renting. Geographic variations in rent-to-buy ratios. Specific mortgage features (offset accounts, overpayments). The calculator shows core math; real decisions need adjustment for local conditions.

Patterns Commonly Observed in Buy vs Rent Comparison

Comparing monthly mortgage against monthly rent without accounting for the equity build (mortgage is partly saving). Ignoring maintenance and property costs that renters don't pay. Using current rent without inflating for 25-30 years of growth. Using optimistic property appreciation assumptions (historical average is 2-4% real). Forgetting opportunity cost on deposit. Assuming you'll stay in the home for 25+ years when most people move every 7-12 years. The calculator gives a principled comparison but real decisions involve many personal factors.