When preparing a company’s accounts, supporting documents may sometimes be treated as an administrative matter — invoices are filed, receipts are kept, and the accounting entries are recorded.
However, supporting documents play a much bigger role than simply keeping the accounts organised.
They provide evidence that a transaction actually took place, explain the nature of the expense and support the amounts recorded in the financial statements and tax computation.
Poor or incomplete documentation can therefore create problems during both an audit and tax review.
Why Are Supporting Documents Important?
Every transaction recorded in a company’s accounting records should ideally be supported by appropriate documentation.
Common examples include:
- Supplier invoices
- Official receipts
- Payment vouchers
- Bank statements
- Contracts and agreements
- Purchase orders
- Delivery orders
- Sales invoices
- Credit notes and debit notes
- Payroll records
- Expense claims
- Relevant correspondence
These documents help establish the who, what, when and amount of a transaction.
For tax purposes, HASiL also states that taxpayers may continue to claim tax deductions using existing documentation until the relevant legislation is amended. This highlights the continued importance of maintaining proper evidence for business expenses, even as e-Invoice implementation progresses.
How Can Poor Documentation Affect an Audit?
During an audit, auditors need to obtain sufficient appropriate audit evidence to support the financial information presented by the company.
When supporting documents are missing, unclear or inconsistent, additional audit procedures may be required.
For example, if a company records RM20,000 as a business expense but cannot provide the supplier invoice, payment evidence or explanation of the transaction, the auditor may need to investigate the transaction further.
This can result in:
- Additional queries from the auditor
- Longer audit completion time
- Requests for alternative supporting evidence
- Possible audit adjustments
- Reclassification of expenses
- Difficulties confirming the accuracy of account balances
In some cases, an expense may need to be adjusted if there is insufficient evidence to support the accounting treatment.
How Can It Affect Tax Computation?
The impact can be even more significant from a tax perspective.
A company generally needs to establish that an expense is incurred in the production of income and meets the relevant requirements for tax deduction.
If the company cannot provide adequate documentation to support the expense, it may become difficult to substantiate the deduction during a tax review.
For example:
Accounting records:
Advertising expense — RM30,000
But the company only has a bank payment with no invoice, agreement, receipt or other evidence explaining what the payment was for.
The payment appearing in the bank statement proves that money was paid, but it may not by itself provide sufficient information about the nature and business purpose of the expense.
This is why businesses should not rely on bank statements alone.
Common Documentation Problems
1. Missing Supplier Invoices
One of the most common problems is recording expenses without retaining the original invoice or other appropriate supporting document.
This makes it harder to verify:
- Supplier details
- Date of transaction
- Description of goods or services
- Amount
- Tax treatment
2. Personal Expenses Recorded as Business Expenses
Business owners may occasionally pay personal expenses through the company bank account.
If these transactions are recorded as business expenses without proper classification, they can create both accounting and tax issues.
Personal expenses should be identified and appropriately recorded rather than automatically treating every payment from the company bank account as a deductible business expense.
3. Incomplete Staff Expense Claims
Employees may incur expenses such as accommodation, mileage, parking, meals or other business-related costs on behalf of the company.
These claims should be supported by appropriate documentation.
HASiL’s e-Invoice guidance continues to recognise situations where employees may use e-Invoices issued in the employee’s name or existing supporting documents where obtaining an e-Invoice in the employer’s name is not possible, subject to the relevant conditions.
4. Payments Without Clear Descriptions
A payment recorded simply as:
“Miscellaneous Expense — RM5,000”
does not provide much information.
Businesses should maintain documents that explain what the payment relates to and why it was incurred.
5. Documents That Do Not Match the Accounting Records
Another common issue occurs when the invoice amount, payment amount and accounting entry do not agree.
For example:
Invoice: RM10,000
Bank payment: RM10,500
Accounting entry: RM10,000
The RM500 difference should be properly explained and supported.
Unexplained differences can lead to additional questions during the audit.
e-Invoice Does Not Replace Good Record-Keeping
With e-Invoice implementation, some businesses may assume that once an e-Invoice is available, no other supporting documents are necessary.
This is not always the case.
Businesses may still need other documents to establish the business purpose and circumstances of a transaction, particularly for areas such as contracts, employee claims, payment evidence and other supporting records.
HASiL’s current e-Invoice guidance describes e-Invoice as documentation that can serve as proof of income or expense, while also providing specific concessions for certain transactions where existing supporting documents may be used.
The key message is simple:
e-Invoice is part of your documentation — it is not a substitute for proper financial record-keeping.
What Should Businesses Do?
Businesses can reduce audit and tax issues by establishing a simple documentation process.
Before recording an expense:
☑ Obtain the relevant invoice or receipt
☑ Confirm the supplier details
☑ Check the date and amount
☑ Confirm the business purpose
☑ Match the document against the payment
☑ Record the transaction under the correct account
☑ Keep related contracts or agreements where applicable
☑ Store the documents in an organised manner
For employee claims:
☑ Obtain the expense claim form
☑ Attach the relevant invoice, receipt or supporting document
☑ Record the business purpose
☑ Obtain the required approval
☑ Match the claim against the reimbursement/payment
A Simple Rule for Businesses
A useful way to think about supporting documents is:
“If someone unfamiliar with the transaction looked at the accounting entry, would the documents clearly explain what happened?”
If the answer is no, the documentation may not be sufficient.
Good documentation should allow an auditor, tax agent or management to understand the transaction without having to rely entirely on verbal explanations.