Mortgage overpayment Germany: how Sondertilgung works and what it saves

Most German mortgage contracts include a right most borrowers barely use: the Sondertilgungsrecht, the right to pay down extra principal beyond your regular monthly rate, without the prepayment penalty that would otherwise apply. Used well, it's one of the more direct ways to cut years and thousands of euros off a mortgage without refinancing anything.

What Sondertilgung actually gives you

Outside of this specific right, paying off a German mortgage faster than agreed generally triggers a Vorfälligkeitsentschädigung, a prepayment penalty compensating the bank for the interest income it loses. Sondertilgung is the contractual exception: an amount, agreed at signing, that you can pay toward your principal each year without triggering that penalty. It's a standard clause on the large majority of residential mortgage offers in Germany, but it's not automatic or unlimited, it's a specific figure negotiated into your contract, and it's worth checking exactly what yours allows before assuming you have it.

How much you can typically overpay penalty-free

The market default is an annual Sondertilgung allowance of around 5% of the original loan amount, though contracts commonly range from 5% up to 10%, and some lenders will negotiate higher still, occasionally in exchange for a small increase in your Sollzins. On a €300,000 loan, a 5% allowance means up to €15,000 a year in penalty-free extra repayment. Most banks limit this to once per calendar year rather than allowing ad hoc payments whenever you like, so timing your payment, and not exceeding your agreed cap, matters.

If your contract doesn't specify a Sondertilgung right at all, or caps it lower than you'd like, this is worth raising during the offer stage rather than after signing, it typically costs little or nothing to add a reasonable allowance upfront, but retrofitting one into an existing contract usually isn't possible.

What overpaying actually saves

The effect compounds, because every euro of extra principal stops accruing interest immediately, which is often a better guaranteed return than what the same money could earn parked elsewhere. Take the same illustrative loan used elsewhere on this site, €300,000 at a 3.5% Sollzins with a 2% initial Tilgung, which without any extra repayments pays off in roughly 29 years with total interest of around €178,000:

Consistently using even a moderate Sondertilgung allowance roughly halves both the payoff time and the total interest in this example. The earlier in the loan's life you start overpaying, the larger the effect, since you're reducing the balance interest accrues on for more remaining years.

When overpaying makes the most sense

Overpaying is most straightforwardly worthwhile when your mortgage rate is higher than what you'd reliably earn, after tax, on the same money invested elsewhere, which is common for most owner-occupiers comparing a mortgage Sollzins against safe alternatives. It's also a useful lever if you're aiming to reduce your Restschuld meaningfully before your Zinsbindung ends, entering Anschlussfinanzierung with a smaller balance reduces your exposure to whatever rate is available at that point. Our guide to choosing a fixed-rate period covers that timing decision in more detail.

When it might not be the best use of your money

Overpaying isn't automatically the optimal choice for everyone. If you don't yet have a solid cash reserve for emergencies, building that first generally comes before extra mortgage payments, since Sondertilgung payments aren't easily reversible. If you have meaningfully higher-interest debt elsewhere, that usually takes priority. And if you're disciplined about investing and your long-run expected returns elsewhere genuinely exceed your mortgage rate after tax and risk, the purely financial answer can favour investing instead, even though paying down the mortgage carries no market risk at all. This is ultimately a personal risk-and-priorities decision as much as a numerical one.

How to actually make an extra payment

Contact your bank directly, most handle Sondertilgung through a straightforward request ahead of your chosen payment date, some via online banking, others requiring written notice by a specific date each year. Confirm the payment is applied to principal and within your contractual allowance before sending it, and keep the confirmation, since it affects your amortization schedule and is worth having on record if any discrepancy comes up later.

For the mechanics of how your regular monthly payment splits between interest and principal in the first place, see our guide to how an annuity loan works. And for the broader financing picture as an international buyer, our guide to mortgages in Germany for expats covers the fundamentals.

As of September 2026. Figures are illustrative, based on a €300,000 loan at a 3.5% Sollzins and 2% initial Tilgung, and are not a substitute for your own amortization schedule. Sondertilgung terms vary by lender and contract; confirm your specific allowance with your bank before relying on it.