Sales Ledger vs Purchase Ledger: Complete Guide

Last reviewed: July 2026.

The sales ledger tracks individual credit customers, while the purchase ledger tracks individual suppliers. Both are sub-ledgers that must reconcile to general-ledger control accounts and support accurate invoicing, collections, payments and financial reporting.

What the sales ledger records

The sales ledger, also called the receivables ledger, contains a separate account for each credit customer. It shows invoices, credit notes, receipts, discounts, refunds and adjustments. Its purpose is to explain the total trade receivables balance and support collection activity.

Cash sales do not normally create customer receivables, although they still enter the general ledger through sales and cash or bank accounts. Credit sales update both the individual customer account and the trade receivables control account.

What the purchase ledger records

The purchase ledger, or payables ledger, contains individual supplier accounts. It records purchase invoices, supplier credit notes, payments, discounts, refunds and other adjustments. The ledger helps the business know what is owed, when payment is due and whether supplier statements agree.

Purchases may be inventory, expenses or assets. The supplier account records the liability, while the debit side of the transaction goes to the appropriate purchase, expense, inventory or asset account.

How sub-ledgers connect to the general ledger

Individual customer and supplier accounts are subsidiary records. The general ledger contains aggregate control accounts for total trade receivables and trade payables. In an integrated system, one invoice can update the sub-ledger, control account, revenue or expense, tax and inventory records automatically.

Automation does not change the accounting logic. The total of customer balances should agree to the receivables control account, and the total of supplier balances should agree to the payables control account.

Credit sale example

Event	Debit	Credit
Issue sales invoice	Trade receivables	Sales revenue and output tax where applicable
Customer pays	Bank	Trade receivables
Issue credit note	Sales returns / revenue adjustment and tax	Trade receivables
Allow settlement discount	Discount allowed / revenue adjustment	Trade receivables

The individual customer account mirrors the movement in the total receivables balance. Reference numbers should connect the invoice, delivery evidence, receipt and any credit note.

Credit purchase example

Event	Debit	Credit
Record supplier invoice	Inventory, expense or asset and input tax	Trade payables
Pay supplier	Trade payables	Bank
Receive supplier credit note	Trade payables	Purchase return / expense or asset adjustment and tax
Receive settlement discount	Trade payables	Discount received / purchase adjustment

The supplier account should show the same documents as the supplier’s statement, allowing for timing differences such as payments not yet received.

Reconciliation controls

• Reconcile sub-ledger totals to control accounts at least monthly.
• Investigate unallocated cash and unmatched credit notes.
• Reconcile material supplier accounts to external supplier statements.
• Review aged receivables and payables for old or unusual balances.
• Confirm that manual journals to control accounts are restricted and approved.
• Check cut-off around the reporting date.

Reconciliations are evidence that the detailed records and aggregate ledger remain complete and accurate. Differences should be resolved, not carried indefinitely in suspense.

Ageing reports and cash management

A receivables ageing report supports collection priorities, credit limits and expected credit loss calculations. A payables ageing report supports cash forecasting, discount decisions and supplier relationships. Both reports depend on correct due dates and allocation of payments.

Old credit balances in receivables or debit balances in payables may indicate overpayments, refunds, posting errors or transactions allocated to the wrong account.

System access and segregation of duties

The person creating customers or suppliers should not have unrestricted ability to approve invoices, change bank details and release payments. Segregation of duties reduces fraud and error risk. Where staffing is limited, management review and exception reports become more important.

Changes to supplier bank accounts should require independent verification. Customer credit limits, write-offs and refunds should also have approval controls.

Common sales-ledger errors

• Posting a receipt to the wrong customer.
• Failing to process credit notes or returns.
• Duplicating sales invoices.
• Leaving unapplied cash outside customer accounts.
• Writing off a balance without approval.
• Recording revenue before the sale criteria are met.

Regular statement distribution and customer confirmations can identify differences early. The ledger should also distinguish disputed balances from ordinary overdue amounts.

Common purchase-ledger errors

• Duplicating supplier invoices.
• Posting an invoice to the wrong supplier or period.
• Paying against altered bank details.
• Missing supplier credit notes.
• Recording capital expenditure as an ordinary expense.
• Ignoring supplier-statement differences.

Three-way matching between purchase order, receipt evidence and supplier invoice is a strong preventive control. Exceptions should be documented and approved.

Month-end workflow

Close the period only after posting all known invoices, receipts, payments and credit notes; reconciling sub-ledgers to control accounts; reviewing ageing; and resolving material exceptions. The close file should retain reports and reviewer sign-off.

A clean ledger provides the detailed evidence behind trade receivables, trade payables, revenue, purchases, cash forecasts and impairment estimates.

Related accounting guides

• Purpose of Control Accounts: Reconciliation Guide
• Purchase Ledger System: Entries, Controls and Reconciliation
• General Ledger in Computerised Accounting: Controls and Close

Authoritative references

• ACCA: Sales and purchases in a computerised accounting system
• ACCA: Supplier statement reconciliations

Practical takeaway

Keep customer and supplier accounts detailed, current and independently reconciled. Restrict manual journals to control accounts, review ageing and unallocated items, verify supplier changes, and maintain a clear link from source documents to sub-ledgers and the general ledger.

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