Bookkeeping basics: start with the source document

What you will learn

• Recognize the difference between an invoice, a receipt, a bill, and a bank statement.
• Keep the business reason, date, amount, and supporting document together.
• Distinguish the event that creates a balance from the payment that clears it.

One sale can create two different events

Imagine a fictional parts business sends a customer a $600 invoice on Monday. The customer pays it on Friday. The invoice and the bank deposit relate to the same sale; they are not automatically two separate sales. The exact entries and timing depend on the accounting method your business uses.

Keep the invoice number with the payment evidence. That connection lets you investigate an open balance without guessing whether the customer paid. A bank statement shows that money moved, while the invoice explains what was sold.

A practical document checklist

1. Record who the transaction is with and the business purpose.
2. Keep the document date, payment date, currency, and amount distinct.
3. Save the original receipt, invoice, bill, or statement, using a reference you can find later.
4. Link credits, refunds, and partial payments to the original transaction.
5. Ask about missing or unclear details before treating a draft as complete.

Use fictional records while learning. Do not put customer bank details, card information, passwords, or private financial documents into a public demonstration.

Try this two-minute exercise

Fictional example: a supplier bill is $240. The business pays $100 now and $140 later. List the documents you would retain and explain why the remaining balance after the first payment is $140.

Suggested answer: retain the supplier bill and both payment confirmations. Connect the two payments to that bill, so the total paid is $240 and the final open balance is zero. Recording a payment should not create a second supplier purchase.

Continue when you are ready

The subscriber lesson adds the full video, study materials, and guided learning tools. Academy access is included with an active paid subscription. You can also read the inventory bookkeeping guide or explore the interactive product demo using fictional records.