Arenja & Raj Finanz
Comparing rent against a mortgage payment tells you almost nothing. This follows both households year by year and shows when the owner's net worth overtakes the renter's — including the purchase costs that never come back.
If you rent
The Kaltmiete — compare like with like, since an owner pays the service charges either way.
If you buy
Property tax, building insurance, the non-allocable part of the Hausgeld and a maintenance reserve.
The renter is assumed to invest both their own funds and any month where renting costs less than owning. These three numbers drive the answer more than anything else — try moving them.
Buying pulls ahead after
–
The break-even year is arithmetic. Whether you will still want to live there is not — and that is usually the more important half of the decision.