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How a rent vs buy calculator decides which is cheaper
Rent vs buy is one of the most common personal finance questions in the United States, and the answer changes constantly with mortgage rates, home prices, rent trends, and expected investment returns. A rent vs buy calculator resolves the question by building two parallel scenarios over the same time horizon and comparing the household\u2019s ending net position under each.
On the buying side, the calculator amortizes a standard fixed-rate mortgage and adds annual property tax, homeowners insurance, ongoing maintenance (a common rule of thumb is 1% of home value per year), and HOA fees. Home value grows each year at the appreciation rate you set. At the end of the horizon, the buyer\u2019s wealth is the current home value minus remaining loan balance (their equity) minus estimated selling costs — usually 6% to 8% for realtor commissions plus closing fees.
On the renting side, the calculator assumes the renter invests the money they would have used as a down payment. It grows at the investment return rate. If buying costs more per month than renting, the renter also invests that monthly difference. Rent itself increases each year at the rent inflation rate. Total rent paid is a cash outflow; the ending investment balance is the renter\u2019s wealth.
Break-even is the first year the buyer\u2019s wealth catches up to the renter\u2019s. Buying tends to win on longer horizons because mortgage principal payments and home appreciation compound while transaction costs are amortized over more years. Renting tends to win on shorter horizons and in high-price / low-rent markets. To dig deeper, use our Mortgage Affordability Calculator to size your budget, our Mortgage Calculator to model monthly payments, and our Debt-to-Income Calculator to check lender-ready DTI.
Important: This calculator is for educational estimates only and is not financial, tax, real-estate, or investment advice. Local markets, taxes, insurance, and personal circumstances vary widely. Consult licensed professionals before making property decisions.