Reconcile control accounts to personal ledgers
Compare control-account totals with individual ledger balances, identify supported differences and assess what this check can reveal.
Cambridge International AS & A Level Accounting 9706, 2026–2028 syllabus, Version 2. These lessons cover Topic 1.4 only. Practice is self-checked, not an official Cambridge grade; the separately published 2029 syllabus, timed papers and human subject-teacher review remain outstanding.
Before you begin
- Use double-entry, ledger and trial-balance knowledge from Topic 1.2. Reconciliations compare records with independent or separately maintained evidence; an unexplained difference needs investigation.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
The control account is $200 higher than the personal ledger total. Does this alone identify which record is wrong?
What you will learn
- Reconcile a control-account balance with the total of personal ledger balances
- Locate errors using reconciliation statements
- Evaluate the benefits and limitations of control accounts
Prepare a reconciliation of the two totals
The sales ledger control balance should equal the total of customer debit balances, after considering any customer credit balances. The purchases ledger control balance should equal total supplier credit balances, with debit balances considered separately. Use balances from the same date and the same set of accounts.
List each known difference with its cause and amount, such as a total posted to the control account but not the personal accounts, an item entered on one side only, a transposition, or an incorrect control total. Recalculate the accounts and trace entries to the source records.
Corrections must follow the error
Correct an error in the control account, the personal account or both according to what was wrongly recorded. A difference between totals does not by itself tell you which account is correct. Do not post the net difference to an arbitrary customer or supplier.
Control accounts provide a check on posting, help divide duties and can make a ledger summary available without listing every personal balance. They do not detect every error: a transaction omitted from both sets of records, duplicated consistently or posted to the wrong personal account may still leave the totals equal.
The benefits and limitations depend on accurate book totals, independent comparison and follow-up. A control-account reconciliation cannot detect an error repeated consistently in both the summary and personal ledgers.
Pause and explain
Both a control account and a personal account omit the same credit sale. Will comparing their totals necessarily detect it?
Worked example
The sales ledger control account is $6,240 debit. The customer balances total $5,940 debit because one $300 receipt was posted to the control account but not to the customer's account. Explain the correction.
Show the worked solution
- The control account already includes the receipt and is $300 lower than it would otherwise be.
- The customer's account still overstates the amount owed by $300.
- Credit that customer's account $300; do not post the receipt again to the control account.
Answer Credit the relevant customer's account $300. The personal ledger total then agrees with the $6,240 control balance, assuming there are no other differences.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Purchases ledger control balance is $7,500 credit. Supplier balances total $7,950 credit because a $450 payment was credited to the control account but omitted from the supplier's personal account. What correction is needed?
Give me a hint
The control account already shows the payment; the supplier balance is still too high.
Compare my reasoning
- The supplier's personal account should be debited $450 to record the payment.
- Do not credit bank or debit the control account again; those sides are already recorded.
- The supplier total then falls to $7,500 credit.
Debit the supplier's personal account $450. Do not repeat the general-ledger entry.
Look for these in your work
- Correct account identified
- No duplicate double entry
- Reconciled balance checked
A sales ledger control account is $4,100 debit and customer balances total $4,000 debit. A $100 discount allowed appears in customer accounts but not in the control account. State the correction and its effect.
Give me a hint
A discount allowed reduces receivables and should be reflected in both places.
Compare my reasoning
- The control account has not been credited for the $100 reduction.
- Credit the sales ledger control account $100 with the corresponding debit to discount allowed if that side is also missing.
- After correction, the control balance becomes $4,000 debit.
The control account is $100 too high. Record the missing discount entry in the control account, with the corresponding expense entry if it too is absent; then reconcile to $4,000.
Look for these in your work
- Difference explained
- Entry direction correct
- Other side verified
A control account agrees with the total of personal balances. The accountant concludes every customer transaction was recorded correctly. Evaluate the conclusion and suggest further checks.
Give me a hint
Reconciliation tests whether two totals agree, not whether each total is complete or correctly classified.
Compare my reasoning
- Matching omissions or duplications can preserve agreement.
- A transaction can be posted to the wrong customer while total receivables stay unchanged.
- Trace selected invoices and receipts to source documents and confirm customer balances with statements or remittances.
The conclusion is too strong. Reconcile totals, but also trace samples to evidence and review customer statements, aged balances and unusual entries.
Look for these in your work
- Limit identified
- Wrong-account risk stated
- Further evidence recommended
Common mistakes
- Posting the reconciliation difference to a random personal account
- Mixing balances from different dates
- Assuming equal totals prove each customer and supplier account is correct
What can you explain now?
What is the key comparison in a sales ledger control-account reconciliation?
Compare with the explanation
The control balance against the total of customer account balances
Both totals should represent the same receivables at the same date.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Name one error a control-account reconciliation can detect and one it may not detect.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.