Rent vs Buy Calculator
Compare the net cost of buying a home with a mortgage versus renting over the same period, taking into account costs, appreciation and rent increases.
Results
Net cost of buying
—
Net cost of renting
—
Difference (buy - rent)
—
Indicative recommendation
—
Monthly mortgage payment
—
Estimated home value at the end of the period
—
Outstanding debt at the end of the period
—
Cumulative cost comparison
Net worth evolution (buying)
Net cost of buying = down payment + purchase costs + payments made ∑’ (estimated home value ∑’ remaining debt) at the end of the horizon. Net cost of renting = sum of monthly rents, increased yearly, over the same period.
When should you use this calculator?
This calculator compares the net cost of buying a home with a mortgage versus renting an equivalent home over the same number of years, considering the down payment, purchase costs, mortgage payments, estimated property appreciation and rent evolution.
How it is calculated
The net cost of buying is calculated by adding the down payment, purchase costs and all mortgage payments made during the comparison horizon, then subtracting the equity generated: the estimated property value at the end of the period (applying the expected annual appreciation) minus the outstanding debt at that point. The net cost of renting is simply the sum of monthly rents paid over the same period, applying the estimated annual rent increase. The difference between the two costs determines which option is cheaper over the chosen horizon.
Practical example
A numeric example: a €250,000 home, with a 20% down payment (€50,000) and 10% purchase costs (€25,000), financed over 30 years at 3% interest, has a monthly payment of €843.21. Over a 10-year comparison horizon, €101,184.97 is paid in instalments, leaving an outstanding debt of €152,039.62. If the home appreciates 2% a year, its value after 10 years is €304,748.60, giving equity of €152,708.99. The net cost of buying is €23,475.98 (down payment + costs + payments ∑’ equity). Renting an equivalent home for €900/month with a 2% annual increase, the accumulated cost over 10 years is €118,256.99. In this scenario, buying works out €94,781.01 cheaper than renting over those 10 years.
Legal and tax context
Buying a home in Spain involves, in addition to the purchase price, extra costs of roughly 10% to 12%: Transfer Tax (ITP) or VAT plus Stamp Duty (AJD) depending on whether it is a resale or new-build property, notary, land registry and gestoría fees. These costs are paid once at signing, but they noticeably affect the total net cost, especially over short comparison horizons.
Renting offers more flexibility and less financial commitment in the short term, and doesn't expose the tenant to property price fluctuations, but it doesn't build equity. Buying involves a larger upfront outlay and less mobility, but allows you to build equity through loan repayment and potential property appreciation. This calculator also doesn't factor in tax deductions for primary residence or rent that may exist depending on the region, which can tip the balance in specific cases.
Common mistakes
A common mistake is not accounting for the opportunity cost of the down payment and purchase costs if you choose to rent instead: that money, invested in another asset rather than tied up in a home, would also generate a return that this calculator doesn't include. Another frequent mistake is assuming the home will always appreciate: 0% or negative annual appreciation radically changes the comparison, so it's worth testing several appreciation scenarios before deciding. It's also easy to forget that homeownership carries recurring costs (property tax, community fees, maintenance, home insurance) that this calculator doesn't include explicitly.
Practical tips
The longer the comparison horizon, the more it tends to favour buying over renting, because the weight of the initial purchase costs is spread over more years and loan repayment progresses further. Over short horizons (2-3 years), renting usually works out better, precisely because purchase costs are only recovered over time. It's worth repeating the comparison with your own numbers (the actual price of the home you're interested in, the actual rent in the area, your actual mortgage terms) rather than relying on a generic example, and consulting a financial advisor before making a decision of this size.
Other calculators you may find useful
If you found this calculator useful, you might also want to check out:
Frequently asked questions
What costs does buying a home in Spain involve besides the price?
Roughly an extra 10% to 12% of the price: Transfer Tax (resale) or VAT plus Stamp Duty (new-build), notary, land registry and gestoría fees, plus the appraisal if applying for a mortgage.
How much down payment do I need to buy a home?
Banks usually finance up to 80% of the appraisal value, so you need at least a 20% down payment plus 10-12% in costs, roughly 30-32% of the property price in savings.
What are the pros and cons of renting versus buying?
Renting offers flexibility, lower financial commitment and no exposure to property price fluctuations, but does not build equity. Buying builds equity and protects you from future rent increases, but involves a high upfront cost and less mobility.
How does home appreciation affect the decision to buy or rent?
The higher the expected home appreciation, the more favourable buying becomes over the long term, since the net equity generated (home value minus remaining debt) offsets the initial costs and payments made.
Why does the comparison horizon change the result so much?
Because purchase costs (10-12% of the price) are paid once and are spread over more years the longer the horizon, while the outstanding debt falls and equity grows over time. Over short horizons, those initial costs weigh more heavily and favour renting.
Does this calculator account for the opportunity cost of investing the down payment?
No. It's an indicative simplification that doesn't consider what return the down payment and purchase costs could generate if invested elsewhere instead of being spent on buying, while renting.
What happens if the home doesn't appreciate, or even loses value?
The result changes radically: with 0% or negative appreciation, the equity generated by buying is much lower (or can be negative if the outstanding debt exceeds the home's value), which usually tips the comparison towards renting.
Does this calculator include the maintenance costs of owning a home?
Not explicitly. Property tax, community fees, home insurance and maintenance are recurring ownership costs not included in the calculation, and it's worth adding them separately for a more complete comparison.
Are there tax deductions for buying or renting a home?
Some Spanish regions still offer regional deductions for renting your primary residence (based on age or income) or for buying in specific cases (such as the national primary-residence deduction, phased out except for acquired rights before 2013). They vary a lot by region and year, and aren't included in this calculator.
What mortgage interest rate should I use in the comparison?
Use the real rate you're offered (or expect to be offered) for your profile, not a generic figure. If you're unsure between fixed and variable, try the comparison with both to see how the result changes.