Bookkeeping › Cash Book & Petty Cash

What is the difference between a single, two, and three-column cash book?

Beginner

Answer

A single-column cash book has one money column (cash or bank). A two-column cash book has separate cash and bank columns, handling both together. A three-column cash book adds discount columns (discounts allowed on the debit side, discounts received on the credit side) as memorandum totals posted to the discount accounts.
Three-column: Discount | Cash | Bank on each side.
Discount columns are memoranda, posted in total to the ledger.
Real-world example A business handling both cash and cheques and offering settlement discounts uses a three-column cash book.

Common follow-ups: What do the discount columns record? | Are discount columns part of double entry?