Mortgage rates above four percent raise residential financing costs

Residential property financing became more expensive again in September. According to an ARD financial news report dated September 23, 2026, Interhyp currently quotes just under 4.2 percent for ten-year loans, while Dr. Klein reports an effective annual rate of around 4.1 percent. A year earlier, the corresponding comparison figure at Dr. Klein was 3.4 percent. The increase therefore amounts to approximately 0.7 percentage points.¹

Capital market rates determine financing costs

Individual policy rate decisions alone do not explain this development. Capital market expectations and long-term bond yields are particularly important for longer-term property loans. According to a Haufe report, higher energy prices had intensified concerns about persistent inflation. This pushed up yields on long-term government bonds. Mortgage rates had therefore already risen before the European Central Bank’s latest meeting.²

On September 10, the ECB decided to raise each of its three policy rates by 0.25 percentage points. Since September 16, the deposit facility rate has stood at 2.50 percent and the main refinancing rate at 2.65 percent. The central bank cited continuing inflationary pressure from the Middle East conflict. Its September projection forecasts average euro area inflation of 3.0 percent in 2026 and 2.5 percent in 2027. It did not commit to a fixed path for future interest rates.³

Higher costs coincide with tighter lending standards

The Bundesbank’s bank lending survey published in July had already shown tighter standards for household housing loans in the second quarter. The net share of banks tightening their requirements was seven percent, compared with four percent in the previous quarter. Demand for these loans also recorded its steepest decline in three years. Banks cited factors including higher risks, weaker consumer confidence and increased interest rates. These findings describe the second quarter, not current September demand.⁴

An original, simplified calculation illustrates how sensitive financing is to interest rate changes: for a €300,000 loan with an unchanged initial annual repayment rate of two percent, the initial monthly payment rises from €1,350 to €1,525 when the assumed nominal interest rate increases from 3.4 to 4.1 percent. That represents an additional €175 per month or €2,100 per year. The calculation uses hypothetical nominal rates, not specific loan offers. Fees and individual contractual terms are excluded; effective rates from market comparisons cannot simply be used as nominal rates.

Refinancing moves into focus

Existing loans approaching the end of their fixed-rate period are also affected. Finanztip reports that many households borrowed at around 1.5 to two percent during the low-interest-rate period. Refinancing above four percent significantly changes the balance between interest payments and principal repayments. If monthly payments remain unchanged, repayment can take longer. The extent of the burden depends substantially on the outstanding loan balance. Comparing old and new interest rates alone is therefore insufficient to describe the monthly burden.⁵

There is currently no consensus forecast: in the Interhyp banking panel reported by Haufe, roughly one-third each expected mortgage rates to rise, remain unchanged or fall by year-end. These assessments are forecasts, not established developments.²