What is the difference between a bill and an expense?

• A. A bill records a liability until paid; an expense records a payment at the time of purchase.
• B. A bill is paid immediately; an expense is recorded as debt.
• C. Bills are for payroll; expenses are for purchases.
• D. Bills are customer invoices; expenses are vendor invoices.

Answer: (A)

Think of it as timing and where the impact shows up in financials. A bill is a promise to pay a vendor, so recording a bill creates a liability on the balance sheet (you now owe money) and that liability stays until you make the payment. An expense, meanwhile, is the cost recognized in your income statement for goods or services you’ve used in the period. It reflects the actual consumption of resources, affecting net income, and is recorded in the period when the cost is incurred or when you pay it, depending on how you enter the transaction.

The option you chose describes this distinction clearly: a bill records a liability until paid, and an expense records a payment at the time of purchase. That captures the essential difference between promising to pay later and recognizing the cost in your books. The other statements mix up who’s paying, when payroll versus purchases occur, or what a bill versus an expense represents, which doesn’t align with how bills (liabilities) and expenses (costs recognized in the period) function in accounting.