Annuities are really easy to compare. You should consider how long you want the fixed interest period, otherwise the bank advisors will also calculate indefinitely. With "only" 2-2.5% repayment, I personally would definitely not stay under 15 years of fixed interest. Otherwise, it could possibly become expensive in 10 years. Whoever repays 4% (just as an example) is not affected as much by the interest increase from 2 to 3%, but those who repay two percent currently pay almost as much interest as repayment. This can be reversed in 10 years; then you pay for 5 years longer. You can do that, but you have to be aware of the risk. With the same repayment rate and term from different providers, you can see who is cheaper and who is more expensive by looking at the remaining debt. If you want more than 15 years of fixed interest, it gets quite difficult. The rates for pure annuity loans are currently quite high (compared to 15 years). A building savings contract [Bausparer] might be interesting. But in order for you to qualify for allocation in 15 years, you may have to pay higher rates.