What is one potential problem with variable expenses? Responses Because variable expenses can change monthly, a person may easily forget to save enough money for the fixed expenses, which must be paid every month. Because variable expenses can change monthly, a person may easily forget to save enough money for the fixed expenses, which must be paid every month. Because variable expenses stay the same, it is possible to not set aside enough money for necessary expenses and accrue debt. Because variable expenses stay the same, it is possible to not set aside enough money for necessary expenses and accrue debt. Because variable expenses stay the same, it is possible for a person to get so comfortable with their plan that they forget to check their account for unexpected expenses. Because variable expenses stay the same, it is possible for a person to get so comfortable with their plan that they forget to check their account for unexpected expenses. Because variable expenses can change monthly, they can add up to more than a person realizes they are spending, until there is no money left with payday a week away.