How to track capital gains tax records for property and shares

When you sell an asset for a profit, the government takes a percentage of that profit. This is Capital Gains Tax (CGT).

While you cannot avoid paying tax on your true profit, thousands of investors end up paying tax on money that wasn't actually profit at all. They pay extra tax simply because they lost the records that proved their true costs.

A massive "wake-up call" frequently shared in FIRE (Financial Independence, Retire Early) communities happens when an investor goes to sell a rental property or inherited shares held for decades. They discover they have no records of what the asset originally cost. Because they cannot prove their original investment to the tax authority, they are forced to accept a lower estimated cost basis - which artificially inflates their "profit" and triggers a massive, unexpected tax bill.

Here is how to structure your capital gains records so you never pay more tax than you legally owe.

The Cost Basis: Your most important tax shield

Your cost basis is the total amount you spent to acquire and hold an asset. When you sell, you subtract your cost basis from the sale price to find your taxable profit.

The higher your cost basis, the lower your profit, and the less tax you pay.

Your cost basis is not just the sticker price of the asset. It includes:

1. Acquisition costs: The purchase price, stamp duty, legal fees, and buyer's agent fees.
2. Capital improvements: The cost of renovating a kitchen, building an extension, or adding a new roof to an investment property. (Standard repairs are usually deducted against income, not added to the cost basis).
3. Incidental costs of disposal: The real estate agent fees, legal fees, and marketing costs when you eventually sell.

If you lose the invoice for a $30,000 bathroom renovation on an investment property, your cost basis is $30,000 lower. When you sell, the government will treat that $30,000 as pure profit, and you will pay capital gains tax on it.

Tracking property records

Property is held for decades, which makes record-keeping incredibly fragile. A shoebox of receipts will fade or get lost during a move.

To protect your property cost basis, you must maintain a permanent digital record of these documents:

• The purchase: The original contract of sale and the final settlement statement. These prove the exact purchase price and the legal fees paid.
• The improvements: Invoices and bank statements for major renovations. Do not rely on emails from contractors; download the PDF invoice and file it immediately.
• The sale: The final contract of sale and settlement statement, which will detail the agent commissions and marketing costs.

Tracking shares and ETFs

Modern brokerages track the cost basis of shares automatically. However, you cannot rely entirely on your broker.

If you transfer shares between different brokerage platforms, the original cost basis history is often lost in transit. If you inherit shares, the broker's data might reflect the day they were transferred to you, rather than the legally required date of the original owner's death or purchase.

You should always download and store your own independent records:

• Trade confirmations: The PDF generated immediately after a buy or sell order executes.
• Dividend reinvestment statements: If you automatically reinvest dividends (DRIP), every single reinvestment is a new purchase with its own cost basis. If you do not track these, you will pay tax twice - once when the dividend was issued, and again as capital gains when you sell.
• Corporate action statements: Records of stock splits, mergers, or demergers that alter your cost basis.

Inheritance and "The Cost of Inaction"

Inherited assets cause the most severe tax headaches.

If you inherit a property or a share portfolio, you generally inherit the deceased person's cost basis, or the market value on the date of their death (depending on local tax laws).

If you do not find and secure those records immediately while the estate is being settled, you will likely never find them. Decades later, when you finally sell the asset to fund your retirement, you will face the ultimate cost of inaction: a massive tax bill that could have been completely avoided with a single piece of paper.

Build a system you don't have to think about

Do not wait until tax time to organize your capital gains records. By then, the receipts are lost.

WealthScout allows you to attach your purchase contracts, renovation invoices, and trade confirmations directly to the asset in your dashboard. By storing the evidence right next to the asset value, you guarantee that when the time comes to sell, you have the exact paper trail required to maximize your cost basis and minimize your tax bill.