Rent vs Buy Assumptions That Change the Result

Start with amounts you can verify

Record the actual asking price and rent quote, down payment cash, mortgage note rate and term, renter deposit, buyer closing costs, and any known move-in fees. A loan quote or Loan Estimate is more useful than a generic rate or closing-cost average. The buyer's initial cash includes the down payment and cash-paid closing costs; the renter's initial cash includes the deposit and non-refundable fees. A refundable deposit belongs in exit assets, subject to any stated deduction.

For a financed purchase, do not enter both a closing-cost percentage and the equivalent cash amount as separate costs. They are alternative ways to express one input. In the initial model, closing costs are cash-paid and do not enlarge the loan principal.

Keep recurring costs on the right path

Buyers may pay property tax, homeowners insurance, maintenance, association fees and user-entered mortgage insurance in addition to principal and interest. Renters may pay utilities, insurance or other recurring expenses not included in rent. Do not count escrow and the same tax or insurance item again. If a cost is entered as a percent of property value, note that it changes when the modeled value changes; a fixed annual amount instead follows the separate cost-growth assumption.

Use the ownership-cost guide to check tax, insurance, HOA and PMI categories. Neither it nor the comparison tool should infer local tax law from a currency label.

An input register you can reuse

Document the source date beside each number. For a long holding period, revisit the register when a lease, rate quote, insurance premium or expected move date changes.

Worked input worksheet

Illustrative, not a local market estimate: home price 120,000; down payment 20,000; zero-percent note rate over 100 months; starting rent 1,000 per month; a 12-month stay; no other costs, growth or investment return. Monthly loan principal payment is 1,000. After 12 payments, remaining principal is 88,000 and home equity before selling costs is 32,000. Under the equal-resource comparison, the renter starts with 20,000 available to invest. Their modeled exit assets are 20,000, so the buyer-minus-renter difference is 12,000. The zero rate and zero costs are deliberately unrealistic; they make the arithmetic visible.

Now change one assumption: add 6,000 cash-paid closing costs and a 10% sale-cost rate. At month 12, the buyer's modeled exit assets fall to 20,000 and the renter's rise to 26,000 because the renter could invest the extra upfront cash. The difference becomes -6,000. Compare your own assumptions, then test at least one shorter stay and one adverse return or home-price scenario.

What this comparison cannot establish

A currency selector does not add UK, India, US or other tax rules. The initial model does not automatically calculate mortgage deductions, transfer taxes, capital-gains tax or investment taxes; only include a cost where a labeled input supports it. It also does not price maintenance shocks, lease restrictions, loan refinancing or a forced sale. Keep a separate emergency reserve and a decision log, and obtain local professional advice when a transaction depends on legal or tax treatment.

Return to the housing-cost guide hub for the right next task.

Frequently asked questions

Sources and scope

The CFPB home-budget guide lists monthly ownership and upfront costs. CFPB closing-cost guidance explains why charges vary by transaction. Sources checked October 2, 2026. This guide's hypothetical numbers demonstrate the CalculatorGeek model, not a lender quote or market return.