When people assess whether they can afford to buy a home, the question they almost always ask is: can I afford the mortgage payment? That is the wrong question. Or, more precisely, it is only half the question. The monthly payment is the most visible part — the one that appears in bank simulators and interest rate comparisons. But owning a property generates a steady stream of costs that appear in no simulator and that, if not anticipated, can turn a sound financial decision into an unsustainable burden.
This article is not meant to discourage anyone from buying. It is meant to do the numbers properly before making that commitment.
Why the mortgage is just the beginning
The mortgage payment covers the loan principal plus interest. That is all. It does not cover the cost of holding a property in your name, keeping it habitable, or handling the problems that any building generates over time.
The most common mistake when evaluating a purchase is comparing the mortgage payment with the equivalent rent. That comparison is a useful starting point, but it ignores everything that comes afterward. A tenant pays a fixed amount and the landlord handles the problems. When the boiler breaks down, the owner pays to fix it. When the homeowners’ association levies a special assessment, the owner pays it. When the roof leaks, the owner pays for the repair.
Economists call this the “total cost of ownership.” In residential real estate, it can be structured in three layers: acquisition costs, recurring annual expenses, and unexpected costs. Each has its own logic and its own impact on personal finances.
A widely used rule of thumb estimates that the total ongoing cost of owning a home — excluding the mortgage — falls between 1.5% and 3% of the property’s value each year. On a home worth €250,000, that represents between €3,750 and €7,500 per year — between €312 and €625 per month — in costs that are entirely separate from the mortgage payment.
Purchase costs: before you move in
Buying a property involves one-time acquisition costs that represent a significant percentage of the purchase price. Leaving them out of the financial plan is one of the most common errors, especially among first-time buyers.
Transfer taxes. For resale properties in Spain, the Property Transfer Tax (ITP) ranges from 6% to 10% of the purchase price depending on the region. For new construction, the reduced VAT rate of 10% applies, plus the Documented Legal Acts Tax (AJD), which ranges from 0.5% to 1.5% depending on the region. On a €250,000 home, the tax alone can amount to between €15,000 and €25,000.
Notary and land registry fees. The purchase deed and its registration with the Land Registry generate notarial and registry fees. The amount depends on the property price, but typically falls between €1,000 and €2,500 in total.
Property valuation and mortgage costs. A professional valuation of the property is required to formalize the mortgage. This costs between €250 and €600. Since Spain’s 2019 mortgage law reform, banks bear most of the loan origination costs — but the valuation remains the buyer’s expense.
Real estate agency commission. If the transaction is handled through an agency, the commission typically ranges from 3% to 5% of the sale price, though it may be included in the listed price or negotiated separately.
Together, acquisition costs typically represent 10% to 15% of the purchase price. A €250,000 property can generate between €25,000 and €37,500 in additional costs. This means that a buyer needs not only the down payment — typically the 20% that banks do not finance — but also an additional fund for these costs. Without it, the transaction cannot be completed.
The annual cost of maintaining a home
Once the purchase deed is signed, the cycle of recurring costs begins. These are paid every year and, while many are predictable, they are frequently omitted from initial calculations.
Property tax (IBI). This is the municipal tax on real estate ownership. It is calculated by applying the tax rate set by each local authority to the property’s cadastral value. The amount varies considerably by municipality and cadastral value, but in medium and large cities it typically ranges from €400 to €1,500 per year.
Home insurance. Financial institutions require home insurance as a condition of the mortgage. The cost depends on the coverage and the property’s characteristics, but a basic buildings-and-contents policy typically costs between €200 and €600 per year. Comparing offers annually can meaningfully reduce this expense.
Homeowners’ association fees. These cover the maintenance of common areas: cleaning, concierge services, gardens, elevators, lighting, and building insurance. In a building without special amenities, the monthly fee may be between €50 and €100. If the building has a pool, gym, or full concierge service, it can exceed €200 per month.
Routine maintenance. This includes the small repairs that accumulate over time: a leaking tap, deteriorating paint, failing appliances, broken blinds. No single item is a large expense, but added together over the year they represent a real budget line that deserves a dedicated allocation.
Unexpected expenses: the item nobody budgets
There is a category of expenses that are not strictly unforeseeable — every property generates them at some point — but that are impossible to time or size with precision in advance. These are the costs that separate those who planned their purchase well from those who did not.
System failures. A gas boiler has a useful life of 15 to 20 years. An electric water heater lasts 10 to 15 years. An air conditioning unit, 10 to 15 years. When they fail, replacement can cost between €1,500 and €4,000 depending on the system. Anyone without a dedicated reserve fund for these expenses must either take on credit or disrupt other parts of the budget.
Structural repairs. Damp, roof leaks, cracks in the facade, or problems with the building envelope are more significant works that can exceed €5,000 or €10,000. In older properties, the probability of encountering this type of problem over the life of a mortgage is high.
Homeowners’ association special assessments. These are one-off costs that the homeowners’ association agrees in a general meeting to fund works not covered by the building’s reserve fund. They may be called to replace the elevator, waterproof the terrace, renovate the facade, or update the building’s electrical installations. The amount each owner must contribute can range from a few hundred euros to several thousand, depending on the scope of the work and their share of ownership.
Renovation and adaptation. While not a mandatory cost, many buyers undertake some degree of renovation when they acquire a property: replacing floors, updating the kitchen or bathrooms, repainting, or upgrading the installations. The cost of a basic renovation can range from €10,000 to €40,000 depending on scope and material quality.
The rule of thumb of budgeting 1% to 2% of the property’s value annually for maintenance and unexpected costs is widely used in personal financial planning. It does not guarantee that this amount will cover every expense in every year, but it provides a reasonable foundation for building a home-specific emergency fund.
How to calculate the true cost before deciding
Before signing a mortgage, it is worth building a total cost of ownership table that includes every layer of expense — not just the monthly payment.
The exercise is straightforward. For a €250,000 home with a 25-year mortgage at 3.5% interest, the monthly payment might be approximately €900. But the true monthly cost of ownership would also include:
- Property tax (IBI): between €50 and €125 per month
- Home insurance: between €20 and €50 per month
- Homeowners’ association fees: between €60 and €150 per month
- Provision for maintenance and unexpected costs: between €200 and €400 per month
Adding all of these, the true monthly cost could range from €1,230 to €1,625, compared with the €900 mortgage payment alone. This does not mean that buying is the wrong decision. It means that the decision should be made with complete numbers.
The opportunity cost of the capital tied up in the down payment and acquisition costs is another factor that rarely enters the analysis. That money, invested in a diversified portfolio over the long term, could generate returns that also belong in the calculation.
Knowing the full cost does not discourage homeownership. Quite the opposite: someone who buys with clear numbers can plan their finances without surprises, build a dedicated home fund, and make renovation or improvement decisions in a structured way. Property ownership can be a sound financial and personal decision — but only when it is made with complete information.
