Control Accounts

Functions and Information Sources of Control Accounts

As a business expands, tracking hundreds of individual credit customers and suppliers in a single ledger becomes unmanageable. To keep records organised, the business sets up subsidiary ledgers: the Sales Ledger (containing individual debtor accounts) and the Purchases Ledger (containing individual creditor accounts). The General Ledger retains two summary accounts: the Debtors Control Account (or Debtors Ledger Control Account) and the Creditors Control Account (or Creditors Ledger Control Account).

Five Functions of Control Accounts

• Arithmetical check: They provide an independent check on the arithmetical accuracy of the subsidiary ledgers by comparing the control account closing balance against the total of the schedule of debtors or schedule of creditors.
• Locating errors: When a trial balance fails to balance, control accounts narrow the search by showing whether the error sits in the Sales Ledger, Purchases Ledger, or General Ledger.
• Quick summary for final accounts: They supply instant year-end figures for total debtors and total creditors, removing the need to extract and total hundreds of individual ledger balances manually.
• Finding missing figures: In incomplete records questions, the control account can be used to calculate total credit sales or credit purchases as a balancing figure.
• Deterrence of fraud: Separating duties (having one clerk maintain personal ledgers while another writes up the control account) acts as a deterrent to fraud, because one person alone cannot falsify personal accounts without causing a discrepancy with the control account.

Books of Prime Entry and Information Flow

Control accounts receive periodic summary totals from books of prime entry, not from individual invoices:

• Sales Day Book: Total credit sales posted to the debit of Debtors Control.
• Purchases Day Book: Total credit purchases posted to the credit of Creditors Control.
• Sales Returns Book: Total goods returned by customers posted to the credit of Debtors Control.
• Purchases Returns Book: Total goods returned to suppliers posted to the debit of Creditors Control.
• Cash Book: Receipts from debtors, payments to creditors, discounts allowed and received, dishonoured cheques, and customer/supplier refunds.
• General Journal: Bad debts written off, interest charged on overdue accounts, contra entries, and corrections of errors.

All entries in day books and control accounts are recorded gross, meaning they include VAT where applicable. Cash sales and cash purchases are recorded in the Cash Book and posted directly to the Sales Account and Purchases Account. They never go through a control account because they do not involve credit trade.

Standard Ledger Structure and Split Balances

Trade debtors are current assets with a normal debit balance. Credit sales, dishonoured cheques, interest charged on late payments, and customer refunds increase what is owed and are debited. Receipts, discounts allowed, returns inwards, bad debts written off, and contra settlements reduce what is owed and are credited.

Trade creditors are current liabilities with a normal credit balance. Credit purchases, interest charged by suppliers, and refunds received from suppliers increase the liability and are credited. Payments, discounts received, returns outwards, and contra settlements reduce the liability and are debited.

Why Split Opening and Closing Balances Arise

A control account can have both debit and credit opening and closing balances at the same time. Never net these into a single figure; both balances must be carried down and brought down separately.

• Credit balance on Debtors Control: Occurs when a customer accidentally overpays their account, returns goods for credit after paying their account in full, or pays an advance deposit before goods are dispatched.
• Debit balance on Creditors Control: Occurs when the business overpays a supplier by mistake, returns goods for credit after settling an account in full, or pays an advance deposit to secure raw materials.

Treatment of Bad Debts and Provisions

Only bad debts written off are credited to the Debtors Control Account. The provision for bad debts is never entered in the control account. It is an end-of-year accounting estimate, not an agreed deduction with any specific customer.

Contra Entries and Restocking Charges

1. Contra Entries (Set-Offs)

A contra entry arises when the same person or firm is both your customer and your supplier. Instead of each side paying the other, the smaller amount owed is set off against the larger one.

A contra entry reduces both total debtors and total creditors by the agreed offset figure:

In reconciliation adjustments, an omitted contra must also be deducted from the customer's account in the schedule of debtors and from the supplier's account in the schedule of creditors.

2. Restocking Charges

A restocking charge is a fee charged by a supplier when goods are returned. It covers the cost of repackaging and handling the goods.

• Supplier imposes a fee on our returns: If we return goods costing €500 and the supplier charges a €40 restocking fee, the net credit note received is €460. If the full €500 was entered in the Purchases Returns Book, creditors were reduced by €40 too much. The €40 fee must be credited to Creditors Control (and added back to the supplier's account in the schedule) to reinstate the liability.
• We impose a fee on a customer's returns: If a customer returns €300 worth of goods and we charge a €30 restocking fee, our net credit note is €270. If the gross €300 was entered in the Sales Returns Book, Debtors Control was credited by €30 too much. The €30 charge must be debited back to Debtors Control (and added to the customer's account in the schedule) to reinstate the customer's debt.

Finding Missing Figures in Incomplete Records

In incomplete records questions, control accounts are used to deduce credit sales or credit purchases as a balancing figure.

Finding Credit Sales

To find credit sales, write up the Debtors Control Account. Enter the opening balance (Dr), bank receipts (Cr), discounts allowed (Cr), sales returns (Cr), bad debts written off (Cr), contra entries (Cr), and closing debtors (Cr balance c/d).

Always ensure any other debit-side items are entered before calculating the balancing figure:

• Dishonoured cheques
• Interest charged to customers on overdue accounts
• Cash refunds paid to customers who had overpaid
• Any closing credit balance (carried down on the debit side)

The balancing figure on the debit side is Credit Sales.

Finding Credit Purchases

To find credit purchases, write up the Creditors Control Account. Enter the opening balance (Cr), bank payments (Dr), discounts received (Dr), purchases returns (Dr), contra entries (Dr), and closing creditors (Dr balance c/d). Also include any interest charged by suppliers (Cr) or refunds received (Cr). The balancing figure on the credit side is Credit Purchases.

Reconciling the Control Account with the Schedule of Balances

At Higher Level, examination questions provide an unadjusted control account balance and an unadjusted schedule of balances that fail to agree. You must prepare an Adjusted Control Account and an Adjusted Schedule of Balances to prove they reach the same final figure.

In the Irish bookkeeping system, personal ledger accounts are posted from individual entries in the day books, whereas control accounts are posted from day-book totals. Use the following diagnostic rules to determine where an adjustment belongs:

Errors in Personal Accounts and the Schedule

• Posted to wrong side: Debiting €300 to a customer's account instead of crediting it makes the balance €600 too high. Deduct €600 from the schedule.
• Balance listed on wrong side: If a debtor's credit balance of €200 is listed as a debit balance, the schedule total is overstated by €400. Deduct €400 from the schedule.
• Balance listed at wrong figure: If a balance of €1,250 is listed in the schedule as €1,520, deduct the difference of €270 from the schedule.

Limitations of Control Accounts

A control account acts as an overall check on ledger totals, but it has defined limitations. If an error affects both the control account and the schedule by the identical amount, or affects neither of them, the two records will still agree and the error will remain hidden.

• Error of Omission: A transaction is left out entirely from both the day book and the personal ledger. Once discovered in an examination question, it must be entered in both records to bring them up to date.
• Error of Commission: An invoice is debited to the correct side of the wrong customer's account (for example, debiting D. Kelly instead of P. Kelly). The schedule total and the control account still agree.
• Error of Principle: A transaction violates basic accounting principles, such as recording the purchase of an office van in the Purchases Day Book. Creditors control reconciles with the schedule, but the fixed asset and expense figures in the final accounts are wrong.
• Error of Original Entry: An incorrect figure is entered on the source document and copied into both the day book and the personal ledger (for example, an invoice for €320 recorded as €230 in both places).
• Compensating Errors: Two independent errors of equal amount cancel each other out on opposite sides of the accounts.
• Failure to identify specific accounts: A control account reveals that an arithmetical error exists somewhere in the ledger, but it cannot identify which individual customer or supplier account contains the mistake.

Key terms

Debtors Control Account

A summary account in the General Ledger recording the aggregate totals of all transactions affecting trade debtors, checking the arithmetical accuracy of the Sales Ledger.

Creditors Control Account

A summary account in the General Ledger recording the aggregate totals of all transactions affecting trade creditors, checking the arithmetical accuracy of the Purchases Ledger.

Sales Ledger

The subsidiary ledger containing all individual personal accounts of trade debtors.

Purchases Ledger

The subsidiary ledger containing all individual personal accounts of trade creditors.

Schedule of Balances

A list of individual account balances extracted from the sales or purchases ledger, totalled so it can be compared with the control account balance.

Contra Entry

An accounting offset between the sales and purchases ledgers when the same party is both a customer and a supplier, reducing both debtor asset and creditor liability balances.

Restocking Charge

A handling fee charged by a supplier or levied on a customer when goods are returned, reducing the net credit note value.

Balancing Figure

A missing figure, such as credit sales or credit purchases, calculated by entering all known debit and credit items into a control account and finding the amount needed to balance both sides.