A sales ledger control account summarises every credit transaction with customers in one general ledger account: opening balance plus credit sales, less receipts, credit notes, discounts, bad debts written off and contras. The purchase ledger control account does the same for suppliers. Reconciling means proving that each control account balance equals the total of the individual customer or supplier balances, then correcting whichever side contains the error.
What goes into the sales ledger control account?
The sales ledger control account (trade debtors control) records totals of transactions that change what customers owe. Amounts go in at the figure the customer is charged, so invoices are posted gross, including VAT.
| Debit side (increases debtors) | Credit side (reduces debtors) |
|---|---|
| Opening balance | Receipts from credit customers |
| Credit sales, including VAT | Credit notes and sales returns, including VAT |
| Payments returned unpaid by the bank | Discounts allowed |
| Refunds paid to customers who had overpaid | Irrecoverable debts written off |
| Contras with the purchase ledger | |
| Closing balance carried down |
Two things do not belong in it. Cash sales never create a debtor, so they bypass the control account. And the allowance for receivables is kept in its own account; ACCA’s material shows it held separately and deducted from trade receivables only when the balance sheet is prepared, so the control account still agrees to the customer balances.
What goes into the purchase ledger control account?
The purchase ledger control account (trade creditors control) is the mirror image.
| Debit side (reduces creditors) | Credit side (increases creditors) |
|---|---|
| Payments to suppliers | Opening balance |
| Credit notes and purchase returns, including VAT | Credit purchases and expenses, including VAT |
| Discounts received | Refunds received from suppliers |
| Contras with the sales ledger | |
| Closing balance carried down |
A contra arises when the same business is both a customer and a supplier and the two agree to set one balance against the other. It is debited to purchase ledger control, credited to sales ledger control, and posted to both individual accounts. ACCA’s Maintaining Financial Records syllabus specifically includes accounting for contras between trade receivables and payables, because a contra posted on one side only is a classic cause of a difference.
How do you reconcile a control account step by step?
- Balance the control account at the reconciliation date and confirm the opening balance agrees to last period’s reconciled figure.
- Total the list of balances from the subsidiary ledger at the same date, usually from an aged debtors or aged creditors report. Check that credit balances on the list have been deducted, not added.
- Compare the two. If they agree, file the reconciliation with the date and who prepared it.
- Investigate differences on both sides. Some errors affect only the control account, some only the list, so look in both directions.
- Correct the control account by journal for errors in the general ledger, and correct individual accounts for errors in the subsidiary ledger.
- Prepare the reconciliation statement showing the original figures, each adjustment, and the agreed corrected balance.
The corrected control account balance is the figure that goes into the trial balance and the accounts.
What does a worked reconciliation look like?
Illustration only. A business prepares its sales ledger control account for March.
| Item | £ |
|---|---|
| Opening balance 1 March | 18,400 |
| Add credit sales including VAT | 42,000 |
| Less receipts from customers | (39,500) |
| Less credit notes | (1,200) |
| Less irrecoverable debt written off | (600) |
| Less contra with purchase ledger | (300) |
| Closing balance 31 March | 18,800 |
The aged debtors list totals £18,350, a difference of £450. Investigation finds two errors:
- A credit note for £180 was entered on the customer’s account but never posted to the general ledger. The control account is overstated, so it is corrected to £18,620.
- A customer with a debit balance of £270 had been marked inactive and dropped off the report. The list is understated, so it is corrected to £18,620.
Both now show £18,620, which is the debtors figure carried into the trial balance. Together the two corrections explain the £450 difference, but one was in each record, which is why both sides must be checked.
Which errors affect which side?
| Error | Affects |
|---|---|
| Day book or batch total added up wrongly | Control account only |
| Manual journal posted to the control code without a customer or supplier | Control account only |
| Contra or bad debt journal posted in the general ledger only | Control account only |
| Invoice posted to the wrong customer | Neither total; individual balances wrong |
| Balance left off the list, or a credit balance added as a debit | List only |
| Individual invoice posted to the customer account at the wrong amount | List only, if the general ledger total was right |
| Invoice omitted from both records | Neither; the reconciliation will not find it |
The last two rows show the limits. A reconciliation proves the two records agree, not that they are complete or posted to the right customer. Customer queries, supplier statements and bank reconciliations catch what control accounts miss.
How does a supplier statement reconciliation fit in?
For the purchase ledger, the most useful outside evidence is the supplier’s own statement. ACCA’s syllabus includes reconciling a supplier’s statement to the supplier’s account in the payables ledger, and ACCA continues to examine it after moving its foundation papers to computerised systems. Typical reconciling items are payments in transit, invoices the supplier has issued but the business has not yet received or posted, and credit notes in dispute. Reconcile the largest suppliers monthly; a supplier balance that cannot be agreed is often the first sign of a missing invoice, which also means missing input VAT.
How do bad debts and VAT affect the control account?
Writing off a debt credits sales ledger control and the customer’s account and debits irrecoverable debts. To recover the VAT already paid on the original invoice, VAT Notice 700/18 sets conditions: the VAT must already have been accounted for and paid, the debt must be written off in the day to day VAT accounts and transferred to a separate bad debt account, and at least six months must have passed from the later of the date payment was due and the date of supply. The claim goes in box 4 of the VAT return, and the notice requires records supporting it to be kept for four years from the claim, in addition to the normal six year rule. See our guide to bad debts and, for debts that are doubtful rather than lost, impairment of debtors.
What mistakes cause unexplained differences?
- Reconciling at different dates, for example a control account at month end against an aged report run a week later.
- Posting opening balances twice after a software change, once as a journal and once as customer invoices.
- Forcing the difference into suspense or sundry expenses, which hides errors that may recur. Our page on the trial balance explains how suspense accounts should be cleared.
- Ignoring unallocated receipts, which leave the totals agreeing but the ageing wrong.
For how the control accounts sit within the wider ledger system, see the general ledger and subsidiary ledgers, and for the cash side, bank reconciliation.
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Related Accountapedia entries
- Reconciling supplier statements
- Contra entries between customers and suppliers
- Writing off a debt in the books
- The VAT control account
- Double entry bookkeeping explained
- Credit control and the aged debtors report
Sources
- ACCA: FA2%20syllabus%20and%20study%20guide%202020 21%20FINAL
- ACCA: Trade receivables and revenue
- ACCA: Computerised accounting system
- GOV.UK: Relief from vat on bad debts notice 70018
Reviewed by Christine Anderson, Broker, Solar Protect. Last reviewed 8 October 2026. Part of Accountapedia, the Solar Protect guide to UK tax and accounting. This page is general information, not personalised advice.