Most rent-vs-buy calculators ask you to plug in numbers and trust the verdict — few show the math underneath. This guide walks through a complete, transparent comparison with 2026 numbers: a $2,000/month rental versus a $350,000 home, so you can rerun the same steps on your own situation.
Note: this is educational content, not financial advice. Every scenario below states its assumptions — change them to match your market and your finances.
How a rent vs buy calculator actually works
A good comparison isn’t just “monthly rent vs. monthly mortgage.” Buying has five cost layers that renting doesn’t:
- PITI: Principal + Interest + property Taxes + homeowner’s Insurance — the true monthly cost of the mortgage.
- Upfront costs: down payment plus closing costs (typically 2–5% of the purchase price).
- Opportunity cost: the down payment could have been invested elsewhere — most calculators assume a 4–7% annual return.
- Equity gained: each mortgage payment builds ownership (principal paid down), which offsets the cost.
- Home price changes: appreciation or depreciation shifts the math; responsible calculators show a range, not a promise.
The breakeven point is the year buying’s total cost drops below renting’s — usually around 5–7 years in US markets, which is why how long you’ll stay is the single biggest variable in the decision.
Worked example: renting $2,000/mo vs buying a $350,000 home
Assumptions (stated, not hidden): 30-year fixed mortgage at 6.5% (illustrative 2026 rate), 20% down ($70,000), closing costs 3% ($10,500), property tax 1.1% of the home price per year, homeowner’s insurance $1,500/year, rent rising 3% per year, down-payment funds assumed to earn 5% per year if not used.
Step 1 — the mortgage payment. Loan amount: $280,000. At 6.5% over 30 years the monthly payment factor is about $6.32 per $1,000 borrowed (that’s the standard amortization formula), so principal and interest come to 280 × $6.32 = $1,769.79/month.
Step 2 — add taxes and insurance (PITI). Property tax: 1.1% × $350,000 = $3,850/year, or $320.83/month. Insurance: $1,500/year = $125/month. Total PITI = $1,769.79 + $320.83 + $125 = $2,215.62/month — about $216 more per month than the $2,000 rent.
Step 3 — equity built in 5 years. After 60 payments on a $280,000 loan at 6.5%, the remaining balance is roughly $262,131 — meaning about $17,869 of principal paid down.
Step 4 — the 5-year comparison. Renting: $2,000/month with 3% annual increases totals about $127,800 over 5 years, with zero equity at the end. Buying: PITI of $2,215.62/month totals about $132,900 over 5 years, plus the $80,500 upfront ($70,000 down + $10,500 closing) — but you end with ~$17,900 in loan principal paid down and ownership of the home.
Takeaway: buying costs more per month here, but equity build-up closes most of the gap by year 5–6. Stay 7+ years and buying typically pulls ahead; move in 2–3 years and renting usually wins on upfront costs alone.
The price-to-rent rule: a 30-second shortcut
Divide the home’s price by the annual rent of an equivalent place. Our example: $350,000 ÷ ($2,000 × 12) = 14.6. The traditional guideline: below ~15, buying tends to be favorable; above ~20, renting tends to win; 15–20 is a gray zone where the details decide. It is a rough filter, not a verdict — use the full comparison above for the real answer.
When buying usually makes sense (and when it doesn’t)
Buying leans favorable: a 5+ year stay, PITI near or below equivalent rent, an emergency fund beyond the down payment, and stable income. Renting leans favorable: a likely move within 3 years, a need for flexibility, maintenance surprises that would strain the budget, or a preference for investing the down payment elsewhere.
Frequently asked questions
Is it better to rent or buy in 2026?
It depends on your timeline and market. The honest rule of thumb: stay less than about 5 years and renting usually wins, because closing costs and the slow start of equity build-up eat buying’s early advantage.
What is the 5% rule for rent vs buy?
A simplified screen: multiply the home price by 5% and divide by 12 — if the result is above your rent, renting may be cheaper. It’s a rough filter from the NYT-style model; the full multi-year comparison is more accurate.
Does a rent vs buy calculator include property taxes and insurance?
A good one does — PITI, not just principal and interest. Our worked example shows taxes and insurance adding about $446/month to the base mortgage payment, which is exactly the kind of line item that flips naive comparisons.
How much do I need to stay to make buying worth it?
In most US markets the breakeven falls around 5–7 years, driven mainly by closing costs (2–5% of the price) and the fact that early mortgage payments are mostly interest. The longer you stay past breakeven, the further buying pulls ahead.
Should I count home appreciation in the comparison?
Only conservatively, if at all. Appreciation is a bonus, not a plan — the example above holds together on costs and equity alone. Never let assumed appreciation be the reason the math works.
Run your own numbers
Plug your rent, home price, down payment, and planned stay into our free mortgage calculator — it includes PITI and PMI so you get the true monthly cost of buying to compare against your rent.