For a loan of 500k (and it seems you need at least that), in my opinion, a payment of 1800 EUR should be made permanently. If it is now about short-term outages (2 years of parental leave without parental allowance), a buffer must be built up for this period in advance. If that is not possible, I would not feel comfortable with the financing and would feel too tight. According to your figures, you would have just under 5500 EUR monthly. Minus 1800 EUR payment, you have 3700 EUR left for living expenses + some buffer from your bonus. That should be enough for three people. One year of parental leave for the second child should look something like this: you 3k (+ possibly child allowance in public service?) + she about 1.5k parental allowance + 2x child benefit. Minus 1.8 EUR payment leaves about 3k + some buffer from your bonus. It only really gets critical if your wife stays at home longer than 1 year. Otherwise, I see it as doable if you are not excessively addicted to consumption. Permanently lowering the payment further I see as dangerous. A healthy initial repayment is about 3%. That also means a certain forced savings through the automatically deducted payment. But permanently I would not go with a smaller repayment. If that makes you feel more secure, you simply agree on at least 2 repayment change options with the loan. Then you could reduce the payment for a certain transition period and then increase it again.