Before signing a home loan contract, applicants should check that they could still pay the monthly instalment if the interest rate rose to 4% or 4.5%, or if their income fell for a while, says Tiaris, a real estate agency in Plovdiv. Rates on new loans are low now, but a mortgage runs for 30 years and there is no guarantee they will stay low.

The average rate on new home loans in Bulgaria was 2.41% in September 2026, the latest data from the Bulgarian National Bank (BNB) show. The annual percentage rate of charge (APR), which shows the full cost of a loan, was 2.76%. Both figures are slightly below August levels.

Tiaris worked out the monthly payment on a €150,000 loan over 30 years. At 2.41%, it is about €586. If the rate rises to 2.91%, half a percentage point higher, the payment goes up to about €625, or around €39 more a month. At 3.91%, 1.5 points above the current rate, it reaches about €708, around €123 more than the starting figure. The agency's experts warn that even a small rise in the rate can add hundreds of euros a year to a household's costs.

The figures assume equal monthly payments, with no fees or insurance, and are only an illustration. They show how a higher rate would strain a budget, not a forecast that loans will cost more. For a loan that is already being repaid, the effect of a rate change depends on the balance still owed, the term and the terms of the contract.

As a rule, the BNB allows a loan of up to 85% of the value of the property that secures it. Debt payments can be up to 50% of the borrower's monthly income. The longest term is 30 years. Limited exceptions are possible. These limits are set by the regulator and do not mean that the biggest loan allowed suits every family. Buyers should therefore judge whether their budget could cope with a higher rate, lower income or unexpected costs. If a tougher scenario leaves too little money for basic needs, the loan amount should be reviewed.

With a floating rate, buyers should find out which benchmark it follows, what the margin is, when the rate changes and whether the contract sets any limits. A change in the European Central Bank's key rates does not raise all payments equally or automatically. The effect depends on the mechanism in the contract. With a fixed rate, buyers should check whether it applies for the whole term or only for the first few years, and what happens after that. Offers should also be compared by APR, required insurance, fees and extra services.

If the bank values the property below the sale price, the buyer may have to put in more of their own money than planned. On top of the price of the home come the local tax, notary and registration fees, a possible agent's commission, financing costs, renovation, furnishing and a reserve for unforeseen costs. Consumer loans, instalment purchases, credit cards and overdrafts affect the bank's assessment, so applicants should find out before applying how the bank counts them.

A lower asking price should be weighed together with the finishing work needed, the quality of the build and the guarantees in the contract. For a property under construction, buyers should look at the building deadlines, the payment schedule and the conditions under which the bank releases the money. If there is a delay, the buyer pays rent for longer while also paying costs for the new home.