Rent vs Buy Break-Even: The Simple 20-Minute Math

One person says, “Renting is throwing money away.”

The other person says, “Buying is a trap, you’re just paying interest and repairs.”

Then somebody posts a calculator screenshot and everyone pretends it settled the debate.

It usually doesn’t. Because the real question is smaller and way more useful:

When does buying break even for me, in my city, with my numbers?

Not in theory. Not in a 30 year horizon. Just, when do the dollars start to tilt in favor of owning. And what do I have to assume for that to be true.

This is the simplest way I know to do that math in about 20 minutes. You can do it in a notes app. Spreadsheet if you want to feel fancy. Same result.

This is not financial advice, obviously. It’s just a clean way to think.

The point of break even (and what it actually means)

Break even is not “owning is better forever.”

Break even is:

The total cost of renting for N years equals the total cost of owning for N years (after you account for what you can sell the home for).

So you’re comparing two paths:

Path A: Rent

• You pay rent.
• Your rent probably rises over time.
• You keep your down payment money invested (or at least not locked into a house).

Path B: Buy

• You pay a mortgage (interest + principal).
• You pay property tax, insurance, maintenance, maybe HOA.
• You get equity as you pay down principal.
• Your home value may rise (or not).
• You pay selling costs if/when you leave.

And the “break even year” is where those two paths cross.

That’s it.

The 20-minute method (high level)

Here’s the method we’re going to use:

1. Write down your rent situation and expected rent growth.
2. Write down the home purchase details.
3. Calculate your annual owner costs (the stuff you don’t get back).
4. Estimate how much equity you build (principal paydown).
5. Estimate resale value (with appreciation) and subtract selling costs.
6. Compare total cost of renting vs owning year by year until they match.

If you can do basic multiplication, you’re good.

I’ll show a simple example with round numbers, and you can swap yours in.

Step 1: Gather your inputs (don’t overthink this)

Renting inputs

• Current monthly rent: R
• Annual rent increase: g_rent (use 3% if you have no idea)
• Renter’s insurance (optional, usually small)

Example:

• Rent = $2,400/mo
• Rent growth = 3%/yr

Buying inputs

• Home price: P
• Down payment: DP (as % or dollars)
• Interest rate: i
• Loan term: 30 years (or 15)
• Closing costs to buy: CC_buy (2% to 4% is common)
• Property tax rate: t_tax
• Homeowners insurance: ins
• HOA: hoa (if any)
• Maintenance rate: m (1% of home value per year is a common starting point)
• Home appreciation rate: g_home (use 3% if you want “meh” conservative)
• Selling costs: CC_sell (agent fees + closing, often 6% to 8%)

Example:

• Price P = $450,000
• Down payment = 10% ($45,000)
• Rate = 6.75%
• Term = 30 years
• Buy closing costs = 3% ($13,500)
• Property tax = 1.2%/yr
• Insurance = $1,800/yr
• HOA = $0
• Maintenance = 1%/yr
• Appreciation = 3%/yr
• Sell costs = 7%

If you don’t know your tax rate, just Google “property tax rate [your county]”. Don’t get paralyzed. Use a decent guess.

Step 2: Calculate the monthly mortgage payment (you can use any calculator)

You don’t need to hand calculate amortization formulas unless you enjoy pain.

Use a mortgage calculator and grab the principal + interest payment (P&I). Then you’ll add taxes/insurance/maintenance.

In our example:

• Loan amount = $450,000 minus $45,000 = $405,000
• Rate = 6.75%
• Term = 30 years

A rough P&I payment is around $2,625/mo (ballpark).

Write down:

• PI = $2,625/mo
• Annual PI = $2,625 × 12 = $31,500/yr

Good.

Step 3: Separate “money you don’t get back” vs “money you keep”

This is where most people mess it up.

When you rent, basically all rent is gone. When you buy, part of your payment is interest (gone), part is principal (you keep as equity).

So in owning, the big “gone” buckets are:

• Mortgage interest (not the full payment)
• Property taxes
• Insurance
• Maintenance/repairs
• HOA
• Opportunity cost of down payment (more on that soon)
• Buying and selling transaction costs

The “not gone” part:

• Principal paydown (equity)
• Any home price appreciation (maybe)

A simple break even model treats principal as savings, not a cost.

So for yearly comparisons, you’ll compute:

Owner unrecoverable cost (year N)

= interest paid (year N) + property tax + insurance + maintenance + HOA

Then later you account for resale value.

Step 4: Estimate interest paid in the first few years (quick approximation)

You can get exact interest paid by year from an amortization schedule. But in a 20 minute model, you can be approximate.

Rule of thumb:

• In year 1 of a 30-year mortgage, most of P&I is interest.
• So interest paid year 1 is close to: loan amount × interest rate

Not perfect, but close enough for a sanity check.

Example:

• Loan = $405,000
• Rate = 6.75%
• Year 1 interest rough = 405,000 × 0.0675 = $27,338

That’s your “gone” interest cost in year 1. In later years it drops gradually.

If you want a slightly better approach without spreadsheets:

• Use an amortization schedule online, copy interest paid for year 1 through year 7 or so. Done. Still 20 minutes.

Let’s do semi-simple and assume interest declines slowly:

• Year 1 interest: $27,300
• Year 2: $26,900
• Year 3: $26,400
• Year 4: $25,900
• Year 5: $25,300

Again, you can pull the real numbers if you want.

Now the rest of annual owner costs:

Property tax

Tax rate 1.2% of value:

• Year 1 tax = 450,000 × 0.012 = $5,400

(Yes taxes rise if value rises. We’ll keep it simple for now. If you want, grow it with appreciation.)

Insurance

• Year 1 insurance = $1,800

Maintenance

1% of home value:

• Year 1 maintenance = 450,000 × 0.01 = $4,500

Total unrecoverable owner costs (Year 1)

• Interest: 27,300
• Tax: 5,400
• Insurance: 1,800
• Maintenance: 4,500
• Total = $39,000/yr

Monthly equivalent: $39,000/12 = $3,250/mo

That number is weirdly important. Because it’s the real “rent-like” cost of owning in year 1, ignoring principal which you keep.

If your rent is $2,400 and the rent-like cost of owning is $3,250, then owning is more expensive in the early years unless appreciation and equity catch up.

Which is normal.

Step 5: Add transaction costs (buying and selling are not free)

Upfront costs (year 0)

• Down payment: $45,000 (not a cost, it becomes equity, but it’s cash tied up)
• Buy closing costs: $13,500 (this is a cost)
• Moving/furnishing: optional, but real. Keep it out if you want clean math.

So “gone” cash at purchase:

• $13,500

Selling costs (when you sell)

• Assume 7% of sale price

If you sell for S, selling costs = 0.07 × S

This matters a lot for break even. Selling costs punish short time horizons.

Step 6: Estimate your home value in year N

Home value after N years with appreciation:

Value(N) = P × (1 + g_home)^N

Example with 3% appreciation:

• Year 5 value: 450,000 × 1.03^5
• 1.03^5 ≈ 1.159
• Value ≈ $521,550

Selling costs at 7%:

• 0.07 × 521,550 ≈ $36,509

Net sale proceeds (before mortgage payoff) is value minus selling costs.

But you still have to pay off the remaining mortgage balance. Which is why equity matters.

Again, easiest way: use a mortgage balance calculator to get remaining balance after N years.

For rough math, in 5 years you might pay down, say, $20k to $30k of principal on a 30 year loan early on. Depends on rate. Let’s assume $22,000 principal paid by year 5.

So mortgage balance at year 5:

• 405,000 minus 22,000 = $383,000

Then your equity at sale:

• Home value: 521,550
• Minus selling costs: 36,509
• Net: 485,041
• Minus mortgage payoff: 383,000
• = $102,041 equity cash-out

But remember, you put $45,000 down. So the “growth” in your equity is about $57k in this rough example, from appreciation plus principal paydown, after selling costs.

This is why people like real estate. Leverage. It can work.

And also why it can hurt if prices drop or you move too soon. Selling costs alone can wipe out a lot.

Step 7: Compute total cost of renting over N years

Rent cost over N years with rent growth is basically a growing annuity. But you don’t need formulas. Just do it year by year.

Example rent = $2,400/mo = $28,800/yr.

With 3% annual growth:

• Year 1: 28,800
• Year 2: 29,664
• Year 3: 30,554
• Year 4: 31,471
• Year 5: 32,415

Total 5-year rent paid: = 28,800 + 29,664 + 30,554 + 31,471 + 32,415

= $152,904

That’s the rent path cost. (Ignoring renter’s insurance, small.)

Step 8: Compute total cost of owning over N years (simple version)

Owning cost over N years can be thought of as:

Total Owner Cost(N)

= (sum of unrecoverable owner costs each year)

• buy closing costs
• (opportunity cost of cash tied up, optional)
• minus (net equity proceeds when you sell minus original down payment, depending on how you treat it)

This is where different calculators differ.

Here’s the clean approach I like for break even:

Approach: Compare “net worth change” under each option

Rent scenario after N years:

• You spent rent (gone)
• You invested your down payment and closing costs instead (maybe)
• Net: investment value minus rent spent

Buy scenario after N years:

• You spent unrecoverable owner costs (interest, tax, etc.)
• You end with net equity after sale (after selling costs and mortgage payoff)
• Net: equity minus unrecoverable costs minus buy closing costs

That comparison feels more real.

But if you want the fastest break even number, you can do this:

Quick break even formula (practical)

Compute:

Rent Total(N)

vs

Owner Unrecoverable Total(N) + Buy Closing + Sell Costs - Home Price Gain - Principal Paydown

Because:

• Appreciation and principal paydown benefit you, reducing effective cost.
• Selling costs and interest/tax/maintenance hurt you.

Let's do a 5-year rough comparison with our numbers.

Rent total (5 years)

• $152,904

Owner unrecoverable total (5 years)

We'll estimate unrecoverable costs average about $39,000 year 1 and maybe $38,000 by year 5 as interest slowly falls but taxes/maintenance may rise. Keep it simple:

• Assume $39,000 each year × 5 = $195,000
• Add buy closing costs: $13,500
• Total before benefits: $208,500

Benefits from owning

• Principal paydown (assume $22,000)
• Home price gain (value increase): 521,550 minus 450,000 = $71,550

Selling costs

• Selling costs ≈ $36,509

Net benefit calculation

• Principal: $22,000
• Appreciation: $71,550
• Minus selling costs: $36,509
• Net benefit: $57,041

Final comparison

Effective owner cost over 5 years:

• $208,500 minus $57,041 = $151,459

Rent cost over 5 years:

• $152,904

That's basically a break even around year 5 in this example.

Key sensitivity factors

Notice how sensitive this is to:

• appreciation rate
• selling costs
• interest rate
• maintenance assumptions

If appreciation were 1% instead of 3%, the price gain is much smaller and break even pushes out. If you sell in year 3, selling costs punch you in the face. If rent is higher, owning looks better sooner.

Still. This is the core math.

A very quick "sanity check" shortcut (for people who hate math)

If you want a blunt quick check before you build anything:

1. Calculate your rent per month.
2. Calculate owner unrecoverable cost per month in year 1: interest (rough) + taxes + insurance + maintenance + HOA, divided by 12.
3. Compare.

If unrecoverable owner cost is way higher than rent, you probably need either a longer time horizon, or meaningful appreciation, or a cheaper home, or a better rate, or higher rent growth.

If unrecoverable owner cost is near your rent, break even is usually not that far out, maybe 3 to 6 years, depending on transaction costs.

Not always. But it's a good gut check.

The three assumptions that move break even the most

1. How long you'll stay

If you might move in 2 years, buying has to overcome buy closing costs, selling costs, and front-loaded mortgage interest. That is a lot. Break even often doesn't happen that fast unless the market is ripping upward.

2. Appreciation (and you can't control it)

People casually plug in 5% appreciation and suddenly buying "wins" in year 2.

Sure. But you're basically betting on the market.

Try 0%, 2%, 3%, and see how the break even year changes. That range tells you the real story.

3. Maintenance and “house stuff”

New roof. Plumbing surprise. Old HVAC. Even if you do everything right, homes cost money.

Using 1% of home value per year is not crazy. In some places it’s low.

And if you’re buying a condo with a high HOA, that changes everything, but sometimes your maintenance drops. You have to be honest with your assumptions.

What about the down payment investment return (opportunity cost)?

This is the one people argue about endlessly, because it’s real.

If you rent, you keep the down payment cash. You could invest it. If you buy, it’s locked into the house.

The simple way to include it:

• Pick an annual return rate (say 5% to 7% nominal).
• Grow your down payment money in the rent scenario.
• In the buy scenario, your “investment” is basically your home equity growth.

If you include opportunity cost, buying usually breaks even later, especially when mortgage rates are high.

But even then, some people still buy because they want stability, control, school district, whatever. Which is valid. Just separate lifestyle reasons from math reasons.

The “life” factors the calculator can’t price correctly

This part is messy. But it matters.

• You want to paint walls, remodel, garden, have a dog door. Ownership scratches that itch.
• You hate surprise expenses. Renting is calmer.
• Your job might move you. Renting keeps you flexible.
• You want predictable payments. Fixed-rate mortgage helps, but taxes and insurance still rise.
• You’re not sure you’ll even like that neighborhood. Renting buys time.

So I’m not going to pretend break even is the only variable. It’s just the one people avoid because it forces clarity.

A simple spreadsheet layout (copy this)

If you want to build this fast, set your sheet like:

Inputs

• Rent0, rentGrowth
• HomePrice, downPayment, rate, term
• taxRate, insurance, hoa, maintenanceRate
• appreciation, buyClosingRate, sellCostRate

Year table columns

• Year
• RentPaidThatYear
• RentTotalToDate
• InterestPaidThatYear
• Taxes
• Insurance
• Maintenance
• OwnerUnrecoverableThatYear
• OwnerUnrecoverableTotalToDate
• HomeValue
• MortgageBalance
• SellingCosts
• NetEquityIfSold
• OwnerNetCostIfSold = OwnerUnrecoverableTotal + BuyClosing - (NetEquity - DownPayment)
• RentNetCost = RentTotal (and optionally subtract investment growth if you model it)

Then find the first year where OwnerNetCostIfSold <= RentNetCost.

That’s your break even.

Where HomeShow.ai fits (because the “real” numbers live in your house)

Here’s something that sounds small but actually helps.

A lot of the owning-side math is just… home data you end up needing anyway. Receipts, warranties, what you replaced, when you replaced it, what it cost, which contractor did it, whether you have an HOA doc, all of that.

If you do buy, that’s the part people are terrible at tracking. Then 3 years later you’re trying to remember:

• when was the water heater installed?
• is the roof under warranty?
• what paint did we use in the living room?
• what model is that dishwasher?

That’s one reason a home hub like HomeShow.ai is actually practical. You can keep your home inventory and records in one place with HomeVault, and if you need a local pro you can book it, chat, schedule, keep everything tied to the home. It’s not a “rent vs buy” calculator. It’s the after-you-buy reality. The paper trail, but not a shoebox.

And if you’re renting, it still helps for managing the stuff you own, especially higher value items you might resell or move.

Anyway. Back to the math.

Wrap up (what to do next)

If you’re deciding rent vs buy, don’t start with opinions. Start with a break even year.

Do this:

1. Pull your rent and a reasonable rent growth rate.
2. Pull a real mortgage quote and property tax estimate.
3. Estimate maintenance honestly.
4. Run the 5-year and 7-year scenarios.
5. Test appreciation at 0%, 2%, 3%.
6. See where break even lands.

If break even is year 9 and you’re likely moving in year 4, that’s your answer.

If break even is year 4 and you want to stay 7 years, also your answer.

And if the math is close, like within a few thousand over 5 years, then it’s a lifestyle decision. Which is fine. That’s normal.

Either way, you’ll be making it with your eyes open. That’s the whole point.

FAQs (Frequently Asked Questions)

What does 'break even' mean in the rent vs buy decision?

Break even is the point where the total cost of renting for N years equals the total cost of owning for N years, after accounting for what you can sell the home for. It's not about owning being better forever, but when the costs of both paths cross.

How do I calculate when buying a home breaks even compared to renting?

You gather your renting inputs (current rent, expected rent growth) and buying inputs (home price, down payment, interest rate, taxes, insurance, maintenance, appreciation, selling costs). Then calculate annual owner costs and equity built each year. Compare total costs year by year until they match to find your break even year.

What are the main costs considered when comparing renting versus buying?

For renting: monthly rent and expected rent increases. For buying: mortgage principal and interest payments, property tax, homeowners insurance, maintenance costs, HOA fees if any, closing costs when buying and selling, and opportunity cost of down payment.

Why is it important to separate 'money you don't get back' from 'money you keep' in this calculation?

Because when owning a home part of your mortgage payment goes toward principal which builds equity (money you keep), while interest, taxes, insurance, maintenance are unrecoverable costs. This distinction helps accurately compare true costs between renting and owning.

Can I do this rent vs buy break even analysis without complex tools?

Yes! You can do this math in about 20 minutes using a simple notes app or spreadsheet. Basic multiplication suffices. Just input your numbers and follow the steps to estimate when owning becomes financially favorable for you.

What assumptions should I use if I don’t know exact rates like property tax or home appreciation?

Use reasonable estimates such as 3% annual rent increase and 3% home appreciation rate if unsure. For property tax rate, you can Google your county’s rate or use a typical value around 1% to 1.5%. The goal is to avoid paralysis by analysis and get a useful rough estimate tailored to your situation.