There may be such a thing as contracting a prospective debt, giving your obligation to become due at a certain time. But then you do not properly owe, because you are under no obligation to pay till it becomes due. But whenever it becomes due you are bound immediately to pay it.

It is unjust to be in debt [past it's due date]. If your creditor has a right to demand payment, you certainly have no right to withhold it. If it is due it is unjust for you not to pay ... It is as much injustice as stealing, and involves the same principle. The sin of stealing consists in the appropriating to ourselves that which properly belongs to another. Therefore whenever you withhold from any man his due, you are guilty of as absolute an injustice, as if you stole his property.