Avoid CGT Surprises: The Must-Keep Documents For Property, Shares & Crypto

Capital Gains Tax (CGT) can catch many Australians off guard—especially when they realise years after a property sale or asset disposal that they needed records they no longer have. The short answer to the common question “What CGT records should I keep, and for how long?” is this: you need to keep comprehensive records of every transaction that may have CGT implications for as long as you own the asset, and for at least five years after the relevant event (like a sale or disposal).

This article breaks down the CGT record keeping requirements clearly and practically, so you know what to keep, how long to keep it, and why it’s critical for your tax position.

Why Capital Gains Tax Records Matter

CGT applies to the sale or disposal of certain assets, most commonly real estate, shares, and crypto. It’s not a separate tax, but part of your income tax. When you dispose of a CGT asset, you need to calculate the capital gain or loss. Without solid records, you may end up paying more tax than you should, or you could fail to comply with the law.

Accurate record keeping ensures:

• You only pay tax on actual gains
• You can claim legitimate deductions (like costs of improvements)
• You can apply discounts correctly (such as the 50% discount for individuals on assets held over 12 months)
• You avoid penalties in the event of an audit

What Types of Assets Trigger CGT Obligations?

You may need CGT records for:

• Real estate (investment properties, vacant land, etc.)
• Shares and managed fund investments
• Cryptocurrencies and digital assets
• Business assets
• Collectables and personal use assets over certain thresholds

Even if you don’t owe any CGT today, you might in the future when the asset is sold. That’s why records from the date of acquisition are essential.

What CGT Records You Must Keep

Your CGT records must include enough detail to accurately calculate your capital gain or loss. Think of these in three phases: acquisition, ownership, and disposal.

Records to Keep When You Acquire the Asset

These documents establish your cost base:

• Purchase contracts or transfer documents
• Invoices or receipts for the asset purchase
• Stamp duty records
• Loan or mortgage documents if borrowed to acquire the asset
• Legal and conveyancing costs
• Any other acquisition-related expenses (e.g. valuation or agent fees)

Records to Keep During Ownership

Throughout ownership, you may incur costs that adjust your cost base or affect your CGT calculation:

• Receipts for capital improvements or renovations
• Insurance and maintenance costs (if they relate to capital improvements)
• Council rates and land tax (for property held as an investment)
• Interest on loans (especially for investment purposes)
• Depreciation schedules (if the asset generates income)
• Records of partial disposals (e.g. subdivision or partial sale)

Records to Keep When You Dispose of the Asset

You must document the final transaction thoroughly:

• Contract of sale or transfer
• Agent or broker fees
• Legal fees
• Advertising or marketing costs
• Capital gains calculation worksheets
• Evidence of exemptions or rollovers (e.g. main residence exemption, small business CGT concessions)

How Long You Need to Keep CGT Records

The general rule from the Australian Taxation Office (ATO) is:

Keep records for at least five years after the year in which you dispose of the asset.

However, if you use capital losses to offset future gains, you must retain relevant documents until the five-year period after you use those losses.

For Real Estate: A Special Note

Because real estate is typically held long-term, keeping records indefinitely is often the safest approach. Even if you believe the main residence exemption applies, keep the documentation. If you rent out the property at any point, your exemption may be reduced.

For Inherited Assets

If you inherit an asset, you must keep records of the deceased person’s acquisition date and cost base. The five-year rule starts from the date you dispose of the inherited asset.

What Happens If You Don’t Have CGT Records?

Without proper records:

• The ATO may deny deductions, exemptions or discounts
• You may have to rely on estimates or statutory formulas that don’t work in your favour
• You risk paying more tax than necessary
• You could face compliance issues or penalties in an audit

In practice, it’s very difficult to recreate accurate records years down the line. That’s why proactive record keeping is key.

Tips for Organising Your CGT Records

You don’t need fancy accounting software to get this right. Here are simple strategies:

• Use cloud storage: Scan and save key documents in Google Drive, Dropbox or OneDrive
• Maintain a CGT asset register: Create a spreadsheet for each asset tracking dates, costs, and improvements
• Label clearly: Include dates and asset names in file names (e.g. “2021_June_Kew_Investment_Property_Renovation_Invoice.pdf”)
• Separate by asset: Keep all documents related to a particular asset in one folder, digital or physical

CGT Record Keeping for Businesses

If you’re a small business owner, CGT concessions may apply on asset sales. The record-keeping burden is higher in these cases:

• Keep documents proving eligibility for small business CGT concessions
• Retain financial statements, business activity records and tax returns
• Maintain records of business structure and ownership changes

These should be kept for at least five years after claiming the concession or disposing of the asset, whichever is later.

Final Thoughts: Avoid CGT Surprises With Solid Records

Whether you’re an investor, small business owner, or just someone who sold a rental property or dabble in crypto, CGT obligations can sneak up if you’re unprepared. The best time to start keeping records was when you bought the asset. The second-best time is now.

Keep documents related to acquisition, ownership, and sale. Store them securely and plan to retain them for at least five years post-disposal. When in doubt, keep it. You’ll thank yourself later, or your accountant will.

If you’re unsure what applies to your situation, speak with a registered tax agent who can guide you based on your specific circumstances.