GST Audit Records: What Small Business Must Keep

For a GST audit or inspection, a small business must keep sales and purchase invoices, expense receipts, bank statements, GST returns, and the underlying accounting records for at least six years. These records must be complete, accurate, and readily accessible so that a tax officer can verify that the correct amount of GST was charged, collected, and paid. Below is a detailed breakdown of the specific records you need, how to organize them, and common mistakes to avoid.

Why GST Record-Keeping Matters

GST (Goods and Services Tax) is a value-added tax collected at each stage of the supply chain. The tax authority needs to confirm that every taxable supply you made was reported and that every input tax credit you claimed was legitimate. Your records are the evidence. Without them, you cannot prove that a sale was genuine, that an expense was business-related, or that you actually paid the GST you collected. Poor record-keeping can lead to penalties, disallowed credits, and a stressful, prolonged audit.

Core Records You Must Keep

While the exact list can vary slightly by jurisdiction, the following are universally required for a GST audit:

• Sales invoices – every invoice you issue for goods or services, including credit notes and debit notes. These must show the GST amount, the GST rate, and your ABN/registration number.
• Purchase invoices – every invoice you receive from suppliers, including import documents. These support your input tax credit claims.
• Bank statements and deposit books – to reconcile the money that actually moved in and out of your accounts with the amounts on your invoices.
• Cash register tapes and EFTPOS reports – for retail businesses, these provide a daily summary of sales.
• GST returns (BAS in Australia, VAT returns in the UK, etc.) – copies of every return you lodged, plus the working papers that show how you calculated the figures.
• Accounting records – your general ledger, journal entries, and any software reports that tie the invoices to the returns.
• Records of non-deductible expenses – for example, entertainment costs where GST was paid but input tax credit cannot be claimed.
• Adjustment notes – for any changes to a sale or purchase after the invoice was issued (e.g., returns, discounts, bad debts).

How Long to Keep Records

Most tax authorities require you to keep GST records for at least five years, but six years is the common safe standard. In Australia, the ATO requires five years. In the UK, HMRC requires six years. In Canada, the CRA requires six years. The clock usually starts from the date the record was created or the date the relevant tax return was lodged, whichever is later. If you are being audited, do not destroy any records until the audit is fully concluded and any disputes are resolved.

Electronic vs. Paper Records

Digital records are perfectly acceptable in most jurisdictions, provided they are legible and cannot be easily altered. If you use accounting software like Xero, QuickBooks, or MYOB, you must keep the software backups and ensure that the digital records are backed up securely. If you use paper records, keep them in a safe, dry place. For electronic records, you must be able to produce a readable copy when asked. Simply having a scanned image of a receipt is usually fine, but the image must show all the required details clearly.

Common Problems During a GST Audit

Many small businesses fail an audit not because they did anything wrong, but because they cannot find the records. Common issues include:

• Mixing personal and business expenses – if you use a personal credit card for business purchases, you must clearly mark which items are business-related.
• Missing or incomplete invoices – a supplier may not show the GST component separately, or you may have lost a receipt. For expenses under a certain threshold (e.g., $75 in Australia), a simple receipt may be enough, but for larger amounts, a full tax invoice is required.
• Failing to record cash sales – if you run a café or retail shop, every sale must be recorded, even if the customer paid cash. The auditor may compare your cash register tape to your bank deposits.
• Incorrect GST treatment – applying the wrong rate (e.g., charging 5% instead of 20%) or claiming input tax credits on items that are not creditable (like entertainment).
• Not reconciling returns – your GST return should match your accounting records. If you just copy last quarter’s numbers, the discrepancy will be obvious.

How to Organize Your Records for an Audit

Preparation is key. Follow these steps to be audit-ready:

1. Use a dedicated business bank account – this automatically separates business transactions from personal ones.
2. Adopt accounting software – even a simple spreadsheet can work, but software makes it easier to generate reports and reconcile.
3. Keep a filing system – whether physical folders or digital folders, organize by month and by type (sales, purchases, bank statements).
4. Reconcile monthly – match your bank statements to your accounting records each month so that errors are caught early.
5. Retain all source documents – do not throw away a receipt just because it is small. If it is for a business expense, it matters.
6. Back up digital records – use cloud storage or an external drive, and test the backup regularly.

What Happens If You Don’t Keep Proper Records?

If you cannot provide the required records during an audit, the tax authority may estimate your GST liability based on the information they have. That estimate is almost always higher than what you would have paid with proper records. You may also face penalties for failing to keep records, which are separate from any tax shortfall. In extreme cases of deliberate evasion, criminal charges can apply, but that is rare for small businesses. The practical consequence is usually a large, unexpected tax bill plus fines.

Frequently Asked Questions

Do I need to keep records for a business that is now closed?

Yes. You must keep records for the required retention period after the business ceases, which is typically five to six years from the date the last return was lodged. If you have closed the business, you still need to be able to substantiate the GST you claimed or collected while it was operating.

Can I keep records on my phone?

Yes, as long as the records are legible and can be printed or viewed on a screen. Many apps allow you to scan receipts and store them digitally. Just ensure you have a backup and that the images are clear enough to read the GST amount and supplier details.

What if I lost a receipt for a small purchase?

For small expenses, some tax authorities allow you to use a bank statement or credit card statement as evidence, but the invoice is always better. If you cannot provide any evidence, you cannot claim the input tax credit. The threshold for a “small” purchase varies – in Australia it is under $75, but check your local rules.

Is a spreadsheet enough for GST records?

Yes, a well-organized spreadsheet can be sufficient, as long as it contains all the required information and can be reconciled to your bank statements and returns. However, spreadsheets are prone to errors and do not automatically calculate GST, so accounting software is recommended for accuracy.

Do I need to keep records of GST I collected but never paid?

Yes. If you collected GST on a sale, you are liable for that amount even if you never remitted it to the tax authority. Your records must show the full amount of GST collected, and the auditor will expect to see that amount in your returns and bank deposits.

Can I destroy records after five years if the audit is still ongoing?

No. If you are under audit, you must keep all records until the audit is complete and any disputes are resolved. Destroying records during an audit can result in penalties and a presumption that the records were unfavorable to you.

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