When setting up your monthly budget, you should always compare income and expenses, but calculate carefully. If you underestimate your budget, even a small unexpected financial burden, such as buying a new washing machine, can mess up your loan repayment. Larger purchases, such as a car, or unexpected events such as prolonged unemployment can jeopardize the entire financing. It is therefore advisable to calculate conservatively in order to use excess money for a special repayment.