The problem is: The bank evaluates your situation now. That your girlfriend will earn money someday or you will earn more money is also welcomed by the bank. But it is not relevant for the current offer.
The bank then only considers your income. That is also why your interest rate is so high. The bank factors in the currently visible additional risk – as of today. So it's unfortunate because you are now securing an interest rate at the current level, but in two years your personal situation (more net income) will look completely different.
I personally also find the remaining debt too high and the repayment too low. The term is 34 years. Phew. Overall, a risky finance
The problem is: The bank evaluates your situation now. That your girlfriend will earn money someday or you will earn more money is also welcomed by the bank. But it is not relevant for the current offer.
The bank then only considers your income. That is also why your interest rate is so high. The bank factors in the currently visible additional risk – as of today. So it's unfortunate because you are now securing an interest rate at the current level, but in two years your personal situation (more net income) will look completely different.
Very good explanation of why the interest rate in this case does not even come close to the advertised conditions on the internet! Since Thomas has done his calculations quite well, I would like to logically continue the cited thought:
Would it be an option for Thomas to go for only 5 years of fixed interest? 5 years with the "bad" interest rates and then, under new conditions (two incomes, some (special) repayments already made, house value increased, etc.), to finish financing in 5 years with top conditions? It doesn't look like interest rates will rise in the medium term (crisis is looming, continued expansive monetary policy has already been communicated, etc.) and if they do, one can take out a forward loan in two years.
: What do you think about this idea?