What does ‘net worth at horizon’ actually compare?

Both buyer and renter start with the same down-payment cash. The buyer puts it into the home; the renter invests it in the market at the alt-return rate. Each year, whichever path has lower housing cost invests the cash-flow surplus at the alt-return rate. At horizon, the buyer’s net worth = home equity (sale value − sell-side closing − loan balance) + buyer’s investment portfolio (years where buying was cheaper); the renter’s net worth = renter’s investment portfolio (the original down payment compounded + savings from years where renting was cheaper). The dollar delta tells you which path produced more wealth at horizon. This is the same methodology the NYT Buy vs Rent calculator uses.

Why the break-even year?

Because most rent-vs-buy decisions are time-horizon-sensitive. Buying carries large upfront transaction costs (closing) that take years to amortize through equity build + appreciation. The break-even year tells you the threshold where buyer net worth catches up to renter net worth. Below break-even, renting wins because transaction costs dominate; above break-even, buying wins because equity + appreciation compound. National break-even runs 5-9 years for typical US conditions; high-rent / fast-appreciation markets break even in 3-5 yrs; low-rent / slow-appreciation markets break even in 8-15 yrs or never.

How does the tax shield calculation work?

Mortgage interest + property tax are deductible against ordinary income for itemizers — the calc subtracts (interest + property tax) × marginal rate from the buyer’s annual housing cost. Two simplifications: (1) the SALT deduction cap of $10K/yr binds for high-earning households in high-tax states, which the calc ignores — for those users the tax shield is overstated; reduce your marginal-rate input by 5-10 pp to compensate. (2) Standard deduction ($29,200 MFJ in 2024) means most low-to-mid-income households get NO tax benefit because itemizing doesn’t exceed the standard deduction; for those users, set marginal rate to 0% to model honestly. The TCJA (2017) dramatically reduced the tax-shield benefit by raising the standard deduction.

Why does the calc include maintenance reserve?

Because it’s the most-underestimated cost in the rent-vs-buy decision. Industry rule: 1% of home value annually for maintenance + repairs + capital improvements. Newer builds (under 5 yrs) run 0.5-1%; standard homes 1-1.5%; older homes (50+ yrs) or coastal-exposure 1.5-2.5%. Over a 10-yr hold, that’s $50K-$150K on a $500K home — multiples of the closing cost difference. First-time buyers routinely model this at $0 or $1K/yr and end up cash-flow-trapped within 5-7 years. The calc uses it as an annual % of home value (not a flat dollar) because maintenance scales with home age and value.

What about PMI (private mortgage insurance)?

Not modeled directly. PMI applies when down payment is under 20%; the cost is 0.5-1% of loan balance per year, removable once you reach 78% LTV automatically (or 80% by request) per the Homeowners Protection Act. For accurate modeling at sub-20% down: add the expected PMI cost to your annual insurance input until you cross 80% LTV (5-10 yrs typically), then remove it. For the calc’s default 20% down assumption, PMI doesn’t apply.

How accurate are the appreciation and rent-inflation defaults?

Defaults (3% appreciation, 3% rent inflation) approximate US long-run nominal averages — Case-Shiller national index averages ~3.5%/yr nominal since 1987; Zumper / Apartment List national rent index averages ~3%/yr 2015-2024. Your specific metro varies widely: Austin / Phoenix / Tampa saw 10-20%/yr appreciation 2020-22 followed by flat-to-declining 2023-25; San Francisco / NYC saw 2-4%/yr long-run with significant volatility; Sun Belt suburbs run higher than national average. Pull Zillow Home Value Index + Apartment List rent index for your specific zip code and use 5-yr trailing averages for the most honest defaults.

Why use net worth instead of total cost?

Because total-cost framing under-counts the renter’s opportunity cost on the down payment. A buyer who spends $100K on a down payment and another $300K over 10 years on housing has ‘$400K total housing cost’ — but if the home is worth $600K at sale with $250K equity, their net cost is actually $150K. A renter who spends $300K on rent over 10 years has ‘$300K total housing cost’ — but if their $100K invested in the market grew to $200K, their net cost is $200K (rent paid − investment gains). Net-worth framing gets the comparison right; total-cost framing systematically biases toward whichever path has lower nominal outflows.

What about the ‘forced savings’ argument for buying?

It’s real but already captured. Mortgage principal payments build equity automatically — that’s the ‘forced savings’ benefit. The calc captures this in the home-equity component of buyer net worth. The argument that buyers actually accumulate wealth while renters spend on consumption is a behavioral observation, not a math observation: the calc assumes a disciplined renter who invests the cash-flow difference. Real-world renters often don’t. If you’re honest with yourself that you’d spend the savings instead of investing them, set the alt-return rate to 0% — that models a non-investing renter and biases the answer toward buying.

How does the calc handle different mortgage products (15-yr, ARM, interest-only)?

The term input handles 15-yr by simply changing the value to 15. ARMs aren’t modeled directly — assume the calc’s fixed rate is your blended expected rate over the hold (typically the initial ARM rate + a 1-2 pp buffer for post-reset). Interest-only loans aren’t modeled — they front-load interest and back-load equity build, which materially shifts the break-even year. For non-standard products, run the calc with conservative inputs and take the result as a floor on the buy-side advantage. For most users, 30-yr fixed is the modal product and the default assumption.

What if rent and appreciation move together (fast-growth metros)?

Fast-growth metros tend to have correlated rent inflation and home appreciation — both rising in tandem. For those, sensitivity analysis matters more than the central case. The +1 pp / -1 pp sensitivity rows show how the answer shifts if your assumptions are off in either direction. If both move +1 pp, the result is approximately the sum of the +1 pp appreciation and +1 pp rent-inflation rows minus the central case. Best practice: run the calc with conservative inputs (appreciation 2%, rent infl 2%) and aggressive inputs (appreciation 5%, rent infl 5%) and see whether the recommendation flips. If yes, you’re in calibration-sensitive territory; if no, the answer is robust.

How does this compare to the NYT Buy vs Rent calculator?

Same core methodology — net-worth-at-horizon comparison, both paths starting with the same down-payment cash, alt-return on the renter’s invested down payment, break-even year search. What this calc adds: explicit tax-shield modeling at the user’s marginal rate (NYT uses a default 25%); ±1 pp sensitivity rows for the two highest-leverage variables (appreciation and rent inflation); the conditional verdict ranking (close-call vs decisive vs material). What this calc simplifies: no inflation on insurance / HOA / maintenance (NYT inflates them at the rent-inflation rate); no separate appreciation rate by year (this calc uses constant); no SALT cap modeling. For a robust answer, run both calcs and triangulate — they should land within 5-10% of each other on identical inputs.

When should I just rent regardless of what the math says?

Five clean cases. Stay under 5 years — transaction costs dominate. Job uncertainty — selling under stress is expensive. Market in clear correction — appreciation goes negative, locking in losses. Liquidity needs — home equity is illiquid; a rental tenant can leave with 30-60 days notice. Lifestyle preference for flexibility — can’t price the optionality of moving on a whim. Conversely, buy regardless when: you’ve found a home you specifically want for emotional / family reasons; you have stable employment in a location you’ll commit to for 10+ years; you’re in a market with persistent rent growth and limited inventory. The math is the floor; the lifestyle factors are the ceiling.

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Buy vs Rent True Cost — Net-Worth-at-Horizon Comparison + Break-Even

Drop home price, down %, mortgage rate, term, property tax, HOA, maintenance, insurance, expected appreciation, current rent, rent inflation, alt investment return, time horizon, transaction cost %, and marginal tax rate. Calculator runs an NYT-style net-worth-at-horizon comparison: both paths start with the same down-payment cash; renter invests it in the market; whichever path has lower annual housing cost invests the cash-flow surplus at the alt-return rate. Output: net-wealth delta at horizon, break-even year, and sensitivity to ±1 pp shifts in appreciation and rent inflation.

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Reviewed by CalcBold EditorialLast verified May 4, 2026Methodology

Home price

Purchase price of the home you’re considering. Use the realistic offer price after typical local negotiation, not the list price. National median ~$420K (NAR, Q4 2024); coastal metros $700K-$1.5M; Texas / Sun Belt suburbs $300-500K.

Down payment

% of home price you put down. 20% avoids PMI (private mortgage insurance, 0.5-1% of loan/yr); below 20% triggers PMI which adds to monthly cost. FHA 3.5% min, VA 0% min, conventional 5% min in most cases. The down payment is the buyer’s opportunity cost — it’s also what the renter invests in the market.

Mortgage rate (APR)

30-year fixed conventional rate as of the offer date. Use Freddie Mac PMMS for the current national average; jumbo / non-conforming loans run 0.25-0.5 pp higher. Investment property and second-home rates run another 0.5-1 pp above primary residence.

Mortgage term

30-yr fixed is the US default; 15-yr saves substantial interest at higher monthly payments; 40-yr is rare and only available on certain non-conforming products. The calc supports any term 5-40 years.

Property tax

Annual property tax as % of home value. Wide US range: TX / IL / NJ / NH 2-3%; CA / CO / FL / AZ 0.6-1.2%; mountain / Southern states 0.4-0.9%. Pull from county assessor or Zillow listing — using the wrong number can swing the answer by tens of thousands.

HOA

Monthly HOA / condo / co-op fee. Single-family homes outside HOAs $0; HOA SFH $50-300/mo; condos $200-800/mo; high-rise / luxury $800-3,000+/mo. HOA is non-deductible and grows over time — set realistically.

Maintenance reserve

Annual maintenance + repairs + capital improvements as % of home value. Industry rule of thumb: 1% of home value/yr. New build 0.5-1%; standard 1-1.5%; older home (50+ yrs) or coastal 1.5-2.5%. Most first-time buyers underestimate this — the calculator is sensitive to it because maintenance scales with home value over time.

Annual insurance

Homeowner’s insurance + flood / earthquake riders if applicable. National median ~$1,500/yr; FL / TX coastal $3-8K/yr; CA fire-zone $4-12K/yr. Pull a quote, don’t guess. Insurance has been the fastest-rising housing cost component 2022-2025 in disaster-prone regions.

Expected home appreciation

Expected annual home value appreciation. US long-run real (after-inflation) appreciation ~1%/yr historically; nominal 3-4%/yr. Bubble peaks (2005, 2021) saw 8-15%/yr but reverted; bust troughs (2009-12) saw -5% to -10%. Pull Case-Shiller for your metro and use a conservative 5-yr trailing average.

Current rent

Equivalent monthly rent for a comparable property to the one you’d buy — same location, beds, square footage, amenities. Don’t compare a house-buy to your current 1-bed rental; size apples-to-apples or the calc misleads. Pull from Zillow / Apartments.com listings for the same area and unit type.

Rent inflation

Expected annual rent growth in your market. National average 3-4%/yr; high-growth metros (Austin, Phoenix, Tampa pre-2023) 6-10%/yr; declining metros (San Francisco 2020-22) -5% to -10%. Pull Zumper / Apartment List trend data for your city; use trailing 5-yr average for stability.

Alt investment return

What the renter earns on the down payment + monthly savings invested in the market. S&P 500 historical real return ~7%/yr; nominal ~10%/yr. Conservative 5-6% if you assume bonds-heavy or post-2022 lower returns; aggressive 8-9% for full equity exposure. The calc uses this rate for both buyer and renter when either has cash-flow surplus.

Time horizon

How long you plan to stay. Median first-time buyer stays 8-13 yrs; repeat buyers 10-15 yrs. The calc’s break-even year tells you the threshold; if your actual stay is shorter, renting almost certainly wins because transaction costs dominate. National median 8 yrs (NAR Profile of Buyers and Sellers, 2024).

Transaction costs (combined buy + sell)

Combined % for closing both sides — buy-side closing 2-3% (loan origination, title, inspection, appraisal); sell-side 6-8% (5-6% agent commission + 1-2% closing). Combined 8-11% is realistic; below 7% only with FSBO sale or off-market direct buyer. Calc splits evenly between buy and sell side.

Marginal tax rate

Federal + state marginal income tax rate. Drives the buyer’s tax shield on deductible mortgage interest + property tax. 22-37% federal alone; add 0-13% state. Note: SALT deduction cap of $10K/yr binds for high-earning households in high-tax states — calc simplifies by assuming full deductibility.

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What This Calculator Does

The Buy vs Rent True Cost Calculator answers the most-asked personal-finance question among urban knowledge workers in their 20s and 30s: given my specific market conditions, my specific rent comparable, and my specific time horizon — does buying actually beat renting on net worth? Drop home price, down %, mortgage rate, term, property tax, HOA, maintenance, insurance, expected appreciation, current rent, rent inflation, alt investment return, time horizon, transaction cost %, and marginal tax rate. The calculator runs an NYT-style net-worth-at-horizon comparison and surfaces the dollar delta plus the break-even year plus ±1 pp sensitivity to the two highest-leverage variables (appreciation and rent inflation).

Most rent-vs-buy calculators online are biased. Realtor sites bake in 5-7% appreciation as default, ignore maintenance reserves, model 25%-flat tax shields, and assume 30-yr horizons. That methodology produces a strong ‘buy is always better’ verdict that doesn’t match the academic literature (Fried & Gyourko; Sinai & Souleles; the 2024 NBER housing-cost update). This calc uses honest defaults: 3% nominal appreciation (Case-Shiller US average), 1%/yr maintenance (industry-standard reserve), explicit marginal tax rate for the shield, and a time-horizon-aware break-even search. The result is the underwriting answer for your situation, not a marketing-pitch answer.

The Math — Net Worth at Horizon Plus Break-Even Search

Three layers compound. Annual cash flow compares buyer (P&I + tax + maintenance + insurance + HOA − tax shield) vs. renter (annual rent). Whichever is lower, the saved difference gets invested at the alt-return rate. Equity build on the buy side comes from two sources: principal paid down on the loan each month, plus appreciation on the home value. Investment portfolio on both sides compounds at the alt-return rate; the renter starts with the down-payment cash, the buyer accumulates only when buying is cheaper than renting in a given year.

Two metrics drive the verdict. Net delta at horizon tells you the bottom-line dollar answer: which path produced more wealth, by how much, at the year you actually plan to sell or stay through. Break-even yeartells you the time-horizon threshold: below break-even, renting wins because transaction costs (10%-ish combined) haven’t been amortized through equity + appreciation; above break-even, buying wins because the equity-and-appreciation flywheel outpaces the renter’s investment portfolio. Most US conditions break even at year 5-9 — well within the median 8-year first-time-buyer hold, but well above a 3-year stay.

A Worked Example — “$500K home, $2,500 rent, 7-yr horizon”

Suppose $500K home, 20% down ($100K), 6.5% rate, 30-yr term, 1.2% property tax, $0 HOA, 1% maintenance, $1,800 insurance, 3% appreciation, $2,500 rent, 3% rent inflation, 7% alt return, 7-year horizon, 10% transaction cost, 32% marginal tax:

Loan: $400K at 6.5% × 30 yrs → P&I = ~$2,528/mo
Year-1 buyer cost: P&I $30,336 + tax $6,000 + maint $5,000 + ins $1,800 + HOA $0 − tax shield ($25,860 interest + $6,000 tax) × 32% = ~$10,196 shield → ~$32,940/yr buyer outflow
Year-1 renter cost: $2,500 × 12 = $30,000/yr
Year-1 diff: buyer pays ~$2,940 more than renter → renter invests $2,940 at 7%
Renter starts with $100K + $25K (buy-side closing) = $125K invested at 7%/yr
By year 7: home value 500K × 1.03^7 = ~$615K; loan balance ≈ $358K (after 7 yrs of amortization)
Sale proceeds: $615K − $30.7K sell closing − $358K balance = ~$226K home equity
Renter portfolio at year 7: ~$125K compounded + ~$25K accumulated savings = ~$220K
Buyer NW: ~$226K · Renter NW: ~$220K (within $6K of each other — coin flip)

At a 7-year horizon, this scenario produces a razor-thin spread. Push the horizon to 12 years and buying pulls ahead by $40-60K as appreciation compounds and the loan amortization accelerates. Push appreciation to 4%/yr and the 7-year horizon flips clearly to buy. Push rent inflation to 4%/yr and same effect — high rent growth is the renter’s biggest risk. The sensitivity rows surface exactly which assumption is doing the work, so you can pressure-test whether the recommendation is robust or calibration-sensitive.

When This Is Useful

Six high-value moments. Pre-offer underwriting.Run before making any offer on a home. The break-even year tells you the minimum stay length to justify the purchase financially; if you’re not committed to that horizon, renting is the right answer. Lease-renewal decision.When your rental lease comes up, run the calc on the equivalent buy in your area. Many renters discover that buying makes sense at a 7-10 year horizon they hadn’t considered. Job-relocation evaluation. Run with conservative horizon (3-4 years) for relocations to roles with uncertain tenure; renting typically wins because transaction costs dominate short holds. Sensitivity-driven negotiation. If the recommendation is borderline (within 5% of home price), the appreciation + rent-inflation sensitivity rows tell you which assumption changes the answer. Negotiate purchase price down 2-3% and the buy decision often firms up. Rate-environment timing. Run with current rate vs. expected lower rate (refinance scenario). If rates are 6.5% today and likely 4- 5% in 18-24 months, the buy decision firms up because the post-refi monthly is materially lower. Build-vs-buy alternative. For new-construction comparisons, run the calc on the full all-in price after upgrades, lot premiums, and landscaping. Builders consistently underprice the headline build cost; the realistic delivered price is 5-15% above the marketing number.

Common Mistakes

Comparing rent for a 1-bed against a buy for a 3-bed house. Apples-to-apples is critical. The right comparison is a same-size, same-area, same- amenities rental against the buy candidate. If you’d buy a 3-bed townhouse, get the rent comparable for a 3-bed townhouse in the same neighborhood — typically $700-1,500/mo more than a 1-bed apartment, which materially shifts the answer.
Setting maintenance to $0. Industry rule is 1% of home value annually. New builds 0.5-1%; standard 1-1.5%; older or coastal 1.5-2.5%. On a $500K home, that’s $5K-$10K/yr — multiples of the closing cost difference. First-time buyers routinely set this to $1-2K/yr and end up cash-flow-trapped in years 4-8 when major systems (HVAC, roof, water heater) fail simultaneously.
Assuming aggressive appreciation. 5-7% appreciation defaults are common in marketing materials but inconsistent with US long-run data (Case-Shiller national index ~3.5% nominal since 1987). Pull your specific metro’s 5-yr trailing average and use that. If your metro saw 10-15% appreciation 2020-22, the regression-to-mean expectation is closer to 0-3% for the next 5 years, not continued double-digit growth.
Forgetting the SALT cap on tax shield. The TCJA (2017) capped state and local tax deduction at $10K/yr — for households in high- tax states (NY, CA, IL, NJ) with property tax + state income tax over $10K, the marginal value of property-tax deduction is reduced. The calc assumes full deductibility; if your SALT cap binds, reduce your marginal-rate input by 5-10 pp to compensate. The standard deduction ($29,200 MFJ 2024) also means most low-to-mid- income households get NO tax benefit; for those users, set marginal rate to 0%.
Ignoring opportunity cost on the down payment. The single biggest renter advantage in the model is having $100K+ invested at 7% from day 1 instead of locked into home equity at 3% appreciation. Total-cost framing systematically ignores this; net-worth framing captures it correctly. If you’re a non-investing renter who’d spend the $100K on consumption, set the alt-return rate to 0% to model honestly — you’ll see the buy decision firm up dramatically.
Underestimating transaction costs. Combined buy + sell typically runs 10-12%, not 5-7%. Buy-side closing 2-3% (loan origination, title, inspection, appraisal); sell-side 6-8% (5-6% agent commission + 1-2% closing). Below 7% only with FSBO sale or off-market direct buyer. Transaction costs dominate short holds — they’re the reason break-even runs 5-9 years even in healthy markets.
Picking a horizon longer than you’ll actually stay. Median first-time buyer stays 8-13 years; many stay much shorter. Career-driven moves, divorce, family expansion, and lifestyle shifts all force unanticipated sales. If you’re uncertain about your 5-year horizon, run the calc at 4-yr and 8-yr horizons and see how the recommendation moves. If buy only wins at 10+ years and your honest probability of staying that long is under 50%, the expected-value of renting often exceeds the expected-value of buying once you weight the early-exit scenarios.

Related Calculators

Before running rent-vs-buy on a specific home, run the House Affordability Calculator (Beyond DTI) to confirm your honest single-income affordability with realistic risk-adjusted assumptions. Rent-vs- buy assumes you CAN afford the home; affordability tells you whether you SHOULD stretch to the modeled price. If affordability says no, the rent- vs-buy math is moot. For monthly cash-flow detail on the financing structure, run the Mortgage Calculator with your specific loan terms — P&I + escrow + PMI breakdown is more granular than this calc’s annual rollup. If renting wins at your horizon, the alt-return assumption is doing a lot of the work — run the Investment ROI Calculator on your actual investment portfolio history. If you’re consistently underperforming the 7% default, the rent-side advantage shrinks. Honest historical returns > assumed forward-looking averages. And once the math says ‘buy is the right path at this horizon,’ sanity- check the down payment + closing against your liquid savings via the Can I Afford Calculator — affording the monthly is one constraint; affording the upfront cash without depleting the emergency fund is a separate constraint that rent-vs-buy deliberately doesn’t check.

Frequently Asked Questions

The most common questions we get about this calculator — each answer is kept under 60 words so you can scan.

What does ‘net worth at horizon’ actually compare?
Both buyer and renter start with the same down-payment cash. The buyer puts it into the home; the renter invests it in the market at the alt-return rate. Each year, whichever path has lower housing cost invests the cash-flow surplus at the alt-return rate. At horizon, the buyer’s net worth = home equity (sale value − sell-side closing − loan balance) + buyer’s investment portfolio (years where buying was cheaper); the renter’s net worth = renter’s investment portfolio (the original down payment compounded + savings from years where renting was cheaper). The dollar delta tells you which path produced more wealth at horizon. This is the same methodology the NYT Buy vs Rent calculator uses.
Why the break-even year?
Because most rent-vs-buy decisions are time-horizon-sensitive. Buying carries large upfront transaction costs (closing) that take years to amortize through equity build + appreciation. The break-even year tells you the threshold where buyer net worth catches up to renter net worth. Below break-even, renting wins because transaction costs dominate; above break-even, buying wins because equity + appreciation compound. National break-even runs 5-9 years for typical US conditions; high-rent / fast-appreciation markets break even in 3-5 yrs; low-rent / slow-appreciation markets break even in 8-15 yrs or never.
How does the tax shield calculation work?
Mortgage interest + property tax are deductible against ordinary income for itemizers — the calc subtracts (interest + property tax) × marginal rate from the buyer’s annual housing cost. Two simplifications: (1) the SALT deduction cap of $10K/yr binds for high-earning households in high-tax states, which the calc ignores — for those users the tax shield is overstated; reduce your marginal-rate input by 5-10 pp to compensate. (2) Standard deduction ($29,200 MFJ in 2024) means most low-to-mid-income households get NO tax benefit because itemizing doesn’t exceed the standard deduction; for those users, set marginal rate to 0% to model honestly. The TCJA (2017) dramatically reduced the tax-shield benefit by raising the standard deduction.
Why does the calc include maintenance reserve?
Because it’s the most-underestimated cost in the rent-vs-buy decision. Industry rule: 1% of home value annually for maintenance + repairs + capital improvements. Newer builds (under 5 yrs) run 0.5-1%; standard homes 1-1.5%; older homes (50+ yrs) or coastal-exposure 1.5-2.5%. Over a 10-yr hold, that’s $50K-$150K on a $500K home — multiples of the closing cost difference. First-time buyers routinely model this at $0 or $1K/yr and end up cash-flow-trapped within 5-7 years. The calc uses it as an annual % of home value (not a flat dollar) because maintenance scales with home age and value.
What about PMI (private mortgage insurance)?
Not modeled directly. PMI applies when down payment is under 20%; the cost is 0.5-1% of loan balance per year, removable once you reach 78% LTV automatically (or 80% by request) per the Homeowners Protection Act. For accurate modeling at sub-20% down: add the expected PMI cost to your annual insurance input until you cross 80% LTV (5-10 yrs typically), then remove it. For the calc’s default 20% down assumption, PMI doesn’t apply.
How accurate are the appreciation and rent-inflation defaults?
Defaults (3% appreciation, 3% rent inflation) approximate US long-run nominal averages — Case-Shiller national index averages ~3.5%/yr nominal since 1987; Zumper / Apartment List national rent index averages ~3%/yr 2015-2024. Your specific metro varies widely: Austin / Phoenix / Tampa saw 10-20%/yr appreciation 2020-22 followed by flat-to-declining 2023-25; San Francisco / NYC saw 2-4%/yr long-run with significant volatility; Sun Belt suburbs run higher than national average. Pull Zillow Home Value Index + Apartment List rent index for your specific zip code and use 5-yr trailing averages for the most honest defaults.
Why use net worth instead of total cost?
Because total-cost framing under-counts the renter’s opportunity cost on the down payment. A buyer who spends $100K on a down payment and another $300K over 10 years on housing has ‘$400K total housing cost’ — but if the home is worth $600K at sale with $250K equity, their net cost is actually $150K. A renter who spends $300K on rent over 10 years has ‘$300K total housing cost’ — but if their $100K invested in the market grew to $200K, their net cost is $200K (rent paid − investment gains). Net-worth framing gets the comparison right; total-cost framing systematically biases toward whichever path has lower nominal outflows.
What about the ‘forced savings’ argument for buying?
It’s real but already captured. Mortgage principal payments build equity automatically — that’s the ‘forced savings’ benefit. The calc captures this in the home-equity component of buyer net worth. The argument that buyers actually accumulate wealth while renters spend on consumption is a behavioral observation, not a math observation: the calc assumes a disciplined renter who invests the cash-flow difference. Real-world renters often don’t. If you’re honest with yourself that you’d spend the savings instead of investing them, set the alt-return rate to 0% — that models a non-investing renter and biases the answer toward buying.
How does the calc handle different mortgage products (15-yr, ARM, interest-only)?
The term input handles 15-yr by simply changing the value to 15. ARMs aren’t modeled directly — assume the calc’s fixed rate is your blended expected rate over the hold (typically the initial ARM rate + a 1-2 pp buffer for post-reset). Interest-only loans aren’t modeled — they front-load interest and back-load equity build, which materially shifts the break-even year. For non-standard products, run the calc with conservative inputs and take the result as a floor on the buy-side advantage. For most users, 30-yr fixed is the modal product and the default assumption.
What if rent and appreciation move together (fast-growth metros)?
Fast-growth metros tend to have correlated rent inflation and home appreciation — both rising in tandem. For those, sensitivity analysis matters more than the central case. The +1 pp / -1 pp sensitivity rows show how the answer shifts if your assumptions are off in either direction. If both move +1 pp, the result is approximately the sum of the +1 pp appreciation and +1 pp rent-inflation rows minus the central case. Best practice: run the calc with conservative inputs (appreciation 2%, rent infl 2%) and aggressive inputs (appreciation 5%, rent infl 5%) and see whether the recommendation flips. If yes, you’re in calibration-sensitive territory; if no, the answer is robust.
How does this compare to the NYT Buy vs Rent calculator?
Same core methodology — net-worth-at-horizon comparison, both paths starting with the same down-payment cash, alt-return on the renter’s invested down payment, break-even year search. What this calc adds: explicit tax-shield modeling at the user’s marginal rate (NYT uses a default 25%); ±1 pp sensitivity rows for the two highest-leverage variables (appreciation and rent inflation); the conditional verdict ranking (close-call vs decisive vs material). What this calc simplifies: no inflation on insurance / HOA / maintenance (NYT inflates them at the rent-inflation rate); no separate appreciation rate by year (this calc uses constant); no SALT cap modeling. For a robust answer, run both calcs and triangulate — they should land within 5-10% of each other on identical inputs.
When should I just rent regardless of what the math says?
Five clean cases. Stay under 5 years — transaction costs dominate. Job uncertainty — selling under stress is expensive. Market in clear correction — appreciation goes negative, locking in losses. Liquidity needs — home equity is illiquid; a rental tenant can leave with 30-60 days notice. Lifestyle preference for flexibility — can’t price the optionality of moving on a whim. Conversely, buy regardless when: you’ve found a home you specifically want for emotional / family reasons; you have stable employment in a location you’ll commit to for 10+ years; you’re in a market with persistent rent growth and limited inventory. The math is the floor; the lifestyle factors are the ceiling.

Buy vs Rent True Cost Calculator

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