Mortgage Financing 2026: The Complete Guide

For many people, buying a property is the biggest financial step of their lives. But between purchase price, interest, repayment, and additional costs, it's easy to lose track. This guide shines a light on the details, with zero bank-advisor-speak, just concrete numbers you can follow right away.

The Basics: Purchase Price, Equity, Loan

The golden rule of mortgage lending: 20% equity. That means you should bring at least a fifth of the purchase price from your own pocket. For a €400,000 property, that's €80,000. Why? The more equity you put in, the lower the risk for the bank. And the better the interest rate you get.

But the purchase price isn't everything. Purchase-related costs add another 8–12% on top, and you usually have to cover them entirely from your equity. The property transfer tax ranges from 3.5% to 6.5% depending on the federal state, the notary costs about 1.5–2%, and the agent (if involved) charges up to 3.57% including VAT. So on a €400,000 purchase price, you're quickly looking at €40,000 in additional costs on top.

Interest & Repayment: How the Monthly Payment Works

The standard model in Germany is the annuity loan. Your monthly payment stays the same for the entire fixed-interest period. It consists of an interest portion and a repayment portion. The clever bit: the interest portion shrinks with every payment, while the repayment portion grows, because your remaining debt gets smaller.

With the fixed-interest period, you decide how long the interest rate is guaranteed. Typically 10, 15, or 20 years. Longer fixed periods give you protection against rising rates but usually cost a small premium. When the fixed period ends, you'll need follow-up financing. Your monthly payment depends on three levers: loan amount, interest rate, and initial repayment rate.

Example Calculation: €400,000 Property

Let's take a typical property for €400,000. You bring €80,000 in equity (20%) and finance €320,000 through an annuity loan:

• Loan amount: €320,000
• Interest rate: 3.8% (10-year fixed)
• Initial repayment: 2.0%
• Monthly payment: €1,547 (approx. €1,013 interest, €533 repayment in the first month)
• Remaining debt after 10 years: approx. €247,000

In 10 years, you've repaid around €73,000 and paid about €112,000 in interest. The payment has stayed constant, but by the final year, roughly €750 of that €1,547 is going toward repayment. Nearly half more than at the start. That's how the principle works.

5 Things That Matter in Mortgage Financing

Equity is king. Every extra euro reduces your payment and lowers your risk. Try not just to hit the 20% but also to have the purchase costs as an additional buffer. Building society savings plans, savings plans, or family support can help close the gap. I saved for two years longer than planned back then. Worth it.

Choose your fixed-interest period wisely. 10 years is the classic and a good compromise. In low-interest phases, a 15- or 20-year fix can make sense. Run through different scenarios: what happens if rates rise by 2% after 10 years? Better to crunch the numbers once than be surprised later.

Get the special repayment option. Negotiate a free special repayment option with the bank, usually 5% of the loan amount per year. Even €1,000 extra annually shortens the term by several years and saves thousands in interest. Bonuses, tax refunds, pay rises. Whatever comes in, straight into repayment.

Don't blindly trust the first offer. Interest rate differences between banks can amount to tens of thousands over the term. Get offers from your local bank, a direct bank, and an independent broker. Then negotiate. Banks move when you bring equity and good credit. My sister got 0.3% knocked off by renegotiating. Sounded small at first, turned out to be nearly €9,000 over 15 years.

Grab subsidy programs. The KfW offers low-interest loans for energy-efficient construction and renovation. Some federal states also have their own programs. Get informed early: many subsidies must be applied for before signing the contract. Afterward, it's too late.

Our Mortgage Calculator

Before you go to the bank, you should know what you can afford. Our mortgage calculator instantly shows you your monthly payment, the interest and repayment breakdown, and the remaining debt after the fixed-interest period. Clear and free.