Journal entries: three entries an owner should understand before approving automation
Follow a supplier bill, its payment, and a correction through the ledger without losing the source or approval trail.
Bottom line
Owners do not need to post every journal entry, but they should recognize the path from a supplier bill to accounts payable, from payment to cash, and from an error to a documented correction. Automation is safer when it preserves that path and sends exceptions to a named reviewer.
Is it right for you?
- Require a source document and business explanation
- Separate preparation, approval, posting, and reconciliation where practical
- Use the correct entity, period, account, and amount
- Reverse or correct entries without erasing the original trail
Entry one: record the supplier bill
| Account | Debit | Credit |
|---|---|---|
| Expense, inventory, asset, or prepaid account | $2,450 | |
| Accounts payable | $2,450 |
The debit depends on what the business received. Coding a laptop, one year of insurance, and a repair to the same expense account would produce a balanced entry but unreliable reports. The $2,450 amount is illustrative.
Entry two: pay the approved liability
| Account | Debit | Credit |
|---|---|---|
| Accounts payable | $2,450 | |
| Cash | $2,450 |
The payment should match the open bill. Posting a second expense at payment would count the cost twice. A partial payment should reduce only the amount paid and leave the remaining payable visible.
Entry three: correct without deleting history
If the bill used the wrong expense account, move the amount with a dated correcting entry that names the original transaction and reason. If the entire bill was entered twice, reverse the duplicate and leave the legitimate bill untouched until both records look identical.
A reviewer should be able to answer who prepared the correction, who approved it, which period changed, and whether a bank, tax, management, or vendor report must also be updated.
Controls to test before enabling automatic posting
- Duplicate invoice detection uses vendor, amount, date, and invoice number.
- Closed-period entries require explicit approval.
- Entity and department rules fail visibly, not by guessing.
- Attachments and approvals remain linked after export.
- The subledger still reconciles to the general ledger.
Frequently asked questions
Does every entry need an invoice? No, but every entry needs appropriate support and a clear reason for it.
Why use a reversing entry? It preserves what happened and offsets it in a controlled way.
Can software choose the account? It can suggest one, but the company remains responsible for the rule, review, and exception handling.
What is the clearest warning sign? An entry with no source, owner, explanation, or link to the process that created it.
What are the three golden rules of journal entries? The traditional rule set sorts every account into personal, real, or nominal, then applies one rule to each: debit the receiver and credit the giver for personal accounts, debit what comes in and credit what goes out for real accounts such as cash or equipment, and debit expenses and losses while crediting income and gains for nominal accounts. The three supplier-bill entries above follow this same logic even without naming it: accounts payable behaves like a personal account, cash is a real account, and the expense or asset account is nominal or real depending on what was purchased.
Related reading on this: COGS formula.
If your team fits that profile instead, check Depreciation.