Rent vs Buy Calculator
Remove the emotion from the decision. We use a long-term Wealth Accumulation Simulation to project your liquid net worth over time, comparing the true costs of renting versus homeownership in Madrid.
1. The Comparison
2. Capital & Financing
3. Property Upkeep
€208 /mo
€750 /yr
4. Market Assumptions
The Stock Return acts as your "opportunity cost"—the return you miss out on by tying your cash up in a down payment.
After 10 Years
Better to BUY
Day 1 Requirement
€151,784
Net Worth Projection (10 Years)
The Financial Breakdown
Liquidation at Year 10
- Home Sale Price
- €640,042
- Minus Remaining Mortgage
- -€304,079
- Minus Selling Fees & Taxes
- -€52,530
- Owner Final Net Worth
- €283,433
- Renter Stock Portfolio
- €259,576
- Minus Capital Gains Tax
- -€20,481
- Renter Final Net Worth
- €239,096
Want to build an exact strategy?
Calculators provide the math, but real estate is a relationship and execution game. We help you navigate the Madrid market, verify legalities, and secure your home safely.
Book a Free Strategy CallWant to dive deeper?
The numbers only tell half the story. If you want a full breakdown of the qualitative factors, read our comprehensive guide to navigating this decision in Madrid.
Read the Madrid Rent vs. Buy GuideUnderstanding the Simulation
When people compare renting to buying, they often mistakenly compare their rent directly to a mortgage payment. A mortgage payment is partially an unrecoverable cost (interest) and partially a forced savings account (principal).
To make an accurate comparison, our algorithm runs a Cash Flow Simulation:
- Year 0: The Owner pays the down payment and all Madrid closing costs (ITP tax, notary, etc.). The Renter takes that exact same amount of cash and invests it in the stock market.
- Every Month: We calculate the Owner's total cash outflow (mortgage + taxes + maintenance) vs the Renter's outflow (rent). Whoever pays less takes the monthly difference and invests it.
- The Exit: At the end of the timeline, both parties liquidate. The Owner sells the house (paying an agency fee and capital gains tax on the profit). The Renter pays capital gains tax on their stock portfolio. We then compare the final liquid Net Worth.
The Behavioral Gap (The Renter's Trap)
Mathematically, renting often wins in high-interest or high-tax environments. However, the simulation assumes the renter possesses extreme financial discipline.
If the model assumes the renter is saving €400 a month compared to the owner, the renter must actually invest that €400 into an index fund every single month. In reality, most people spend their surplus cash flow on lifestyle upgrades. A mortgage acts as a forced savings mechanism, which is why homeowners historically end up wealthier than renters, despite what pure math might suggest.
Furthermore, a stock portfolio might yield higher returns, but you cannot live inside an index fund. The emotional stability and tangible utility of owning the roof over your head holds immense value that a spreadsheet cannot calculate.
Caveats, Limitations & Assumptions
Leverage & Liquidity Risks
Reducing your downpayment (e.g., to 10%) increases your leverage, which makes the buying math look spectacular if property values rise. However, it also magnifies your losses if the market drops. Additionally, property is highly illiquid; selling takes months and costs roughly 5% in fees.
Hard Assumptions
- Rent is adjusted exactly to general inflation every single year.
- The mortgage interest rate is fixed for the entire duration of the loan.
- Stock returns compound monthly and are only taxed at final liquidation, mimicking a tax-advantaged holding strategy until the exit.
Lumpy Maintenance
We assume maintenance costs are spread evenly (e.g., 0.5% every year). In reality, maintenance is "lumpy." You might spend nothing for 5 years, and then face a €15,000 bill for a new roof or building assessment (derrama).
Rent Volatility
While the model inflates rent steadily, Madrid's rental market is subject to aggressive spikes. If a landlord forces you to move out after your 5-year LAU contract expires, your new rent might jump significantly higher than standard inflation.
Constant Rates
The simulation uses constant, annualized rates for stock returns, property appreciation, and inflation. In reality, markets are highly volatile. A 20% stock market drop in Year 1 severely impacts the renter's compounding trajectory.
Tax Nuances
Capital gains taxes vary wildly based on your tax residency. Spain has a tiered capital gains system (19% to 28%), while some expats may utilize foreign tax-advantaged accounts (like a US Roth IRA or UK ISA) which would drastically improve the renter's outcome.