As a rule of thumb, the monthly loan installment should not be more than 35-40% of the monthly net income. With an income of €3,000, the installment should therefore be a maximum of between €1,050 and €1,200 and at the same time there should be no other liabilities . Some credit institutions have requirements for a minimum income. Furthermore, the overall creditworthiness and your age must be taken into account. The financing framework calculator can provide you with information.