A debt has interest; a delayed bill doesn't. An interest-free loan is literally free money (the difference between net present value of future repayments and cu

A debt has interest; a delayed bill doesn't. An interest-free loan is literally free money (the difference between net present value of future repayments and current value, which will be higher); I always take 0% finance if it's on offer. (The only exception would be in a deflationary environment.)