Rent vs Buy. The Real Math.

What each option actually costs

Start with the monthly outflow on each side.

Renting costs, per month:

• Rent — the whole bill, one line.
• Renter's insurance — ~$15/month for typical coverage.
• Utilities — varies, but same on either side.

Buying costs, per month:

• Mortgage P&I — principal + interest on the loan.
• Property tax — 0.5–2.5% of home value annually, divided by 12.
• Homeowner's insurance — usually $100–200/month.
• HOA — $0 to $1,000+/month depending on the property.
• Maintenance reserve — budget 1% of home value per year over long periods.
• PMI (if down payment < 20%) — ~0.5–1.5% of loan value annually.
• Utilities — same as renting, but often higher in a bigger house.

For most markets, the all-in monthly cost of owning the equivalent home is 30–60% higher than renting it. The difference is what the spreadsheet needs to capture.

The two costs most charts skip

Transaction costs. Buying costs 2–5% of the purchase price at closing. Selling costs 6% in real-estate commission, plus a few thousand in miscellaneous fees. Round-trip, that's 8–11% of the home's value — paid out of your equity. On a $500k house, that's $40k–55k gone just for the privilege of buying and later selling.

Opportunity cost on the down payment. A 20% down payment on a $500k house is $100k locked in equity. That $100k could otherwise be invested in index funds returning ~7% real over long horizons. Over 10 years, that $100k could have doubled. Honest rent-vs-buy comparisons include this forgone return — that's what "invest the difference" modeling captures.

The 5-year break-even

Here's why short stays usually lose to renting. In year 1, almost all your mortgage payment is interest (not equity). You've just paid 2–5% in closing costs. If you sell after 2 years, you eat another 6% commission — and interest + transaction costs dwarf any equity you've built.

Around year 5–7, a few things shift:

• More of each payment is going to principal.
• Home appreciation has accumulated to offset transaction costs.
• You've amortized the initial closing costs over a useful number of years.

For most US markets, the break-even horizon is 5–7 years. Below that, renting almost always wins financially. Above that, buying starts pulling ahead — and the gap widens with time.

When renting wins even long-term

There are markets and scenarios where renting keeps winning even past the 5-year mark:

• Very high price-to-rent ratios (NYC, SF, coastal metros) where rent is 1/30th or less of purchase price. Annual cost of owning dramatically exceeds rent.
• Low home appreciation. If your metro appreciates at 2% and your opportunity cost is 7%, the gap swamps principal accumulation.
• High mortgage rates. At 7–8%, the interest portion compounds against you for a decade before the curve flips.
• High career mobility. If there's any chance you'll move in 3–5 years, renting's optionality has real monetary value.

The honest summary

Buying is right when: you'll stay 7+ years, your metro has sensible price-to-rent ratios, rates are reasonable, and you want the stability. Renting is right when: you value optionality, you're in a high-cost metro, rates are elevated, or your horizon is short. Neither is "throwing money away". They're different products with different costs.

Run your specific numbers before committing. The difference between a spreadsheet and a real decision is whether you plug in your metro, your rate, and your horizon. National averages don't own your house.