The Bundesbank has published the “Bezugszins” (10-year zero-coupon euro swap rate) for March 2025. It amounts to 2.65 %.
The “Referenzzins” for the calculation of the “Zinszusatzreserve (ZZR)” as of 31.12.2024 amounts to 1.57 %.
Assuming that the “Bezugszins” remains constant, the “Referenzzins” as at 31.12.2025 would be 1.57 %.