By Werner Gerber, CFA® | Founder, ClearGauge Wealth
ClearGauge Wealth (Pty) Ltd is an Authorised Financial Services Provider (FSP No. 55826). | Reviewed 2 August 2026
Quick Answer
Capital gains tax, or CGT, usually starts with the gain rather than the full sale price. The sum considers proceeds, base cost, allowable adjustments, reliefs and the taxpayer’s facts. A sale of shares or property can also involve other taxes, costs and timing issues.
For the 2026/27 tax year, SARS states a R50,000 annual relief for people and special trusts, a R3 million primary-residence relief subject to rules, and a maximum effective CGT rate of 18% for people and special trusts. These figures are general facts, not a personal sum.
Visual Summary
| Test | What to check | Why it matters |
| Start | Work out the gain | Compare proceeds with base cost and permitted adjustments. |
| Check | Apply the rules | Ownership, use, costs and the nature of the asset can change the result. |
| Exclude | Test relief | Annual and primary-residence reliefs have rules and limits. |
| Plan | Keep records | Contracts, valuations, invoices and dates support a later sum. |
Decision framework for education only. It is not a recommendation or a suitability assessment.
Decision Framework
CGT is often described as a percentage of a property sale or share sale. That shortcut can be misleading. The tax sum starts by identifying a sale or transfer and measuring a capital gain or loss under the current rules.
The same asset can have different tax questions depending on who owns it, how it was used, how long it was held, the record of upgrades and whether an amount is capital or revenue in nature. Get tax advice on the transaction before signing a major sale.
1. Identify the Asset and Disposal
Start with what is being sold or transferred: listed shares, a unit trust, a rental property, a primary home or another asset. The nature of the asset and the deal can change the tax check.
A sale or transfer is wider than receiving cash on a sale date. Gifts, certain transfers and death can also raise CGT questions. Do not assume a family transfer is tax neutral because no cash changes hands.
2. Build the Base-Cost Record
Keep purchase contracts, trading notes, transfer costs, improvement invoices and documents that support the cost of the asset. Some costs may form part of base cost under the rules. Routine repairs and personal costs may be treated differently.
A missing record does not make the tax issue disappear. It can make a later sum harder to support. Rebuild records early, not only when a sale is imminent.
3. Check Exclusions and Taxpayer Status
The annual relief and primary-residence relief are not blanket exemptions. The primary-residence rules include rules, and a property partly used for trade or not used as the usual residence may need a more detailed sum.
Individuals, companies and trusts can have different inclusion rates and tax rates. The taxpayer who owns the asset matters. It is risky to use a person’s headline rate for a company or trust transaction.
4. Compare the Full Transaction
CGT is one part of the decision. A property sale may also have transfer, bond, agent, legal or timing issues. Shares can have dealing costs and an investment decision can have long-term goal effects.
Test the net result and the reason for the sale. A tax estimate should not be the only reason to keep or dispose of an asset.
Key Concepts
A Gain Is Not the Sale Price
A capital gain broadly compares the proceeds with the base cost, subject to the key rules. A high sale price does not by itself show the taxed amount.
Inclusion Rate and Tax Rate Differ
Only the current portion of a net capital gain is included in taxed income. The final tax then depends on the taxpayer’s tax rate and facts.
A Primary Residence Has Conditions
The R3 million relief is valuable but not unlimited. Ownership, usual residence, land size, business use and other facts can affect it.
A Practical CGT File
Keep a separate file for each big asset. Put the purchase date, cost and source documents in it. Add sale records when the time comes. Good records give a tax practitioner facts to work from rather than guesses.
- What asset is being sold or moved?
- Who owns it for tax purposes?
- What was the purchase cost?
- Which costs may support base cost?
- How was the property used?
- Was any part used for trade or rent?
- What are the sale date and terms?
- Which tax year will apply?
Keep the Key Facts Together
Keep contracts, invoices, records, valuation proof and proof of costs. Make a note of missing records while there is time to find them. The record should tell the story of the asset from purchase to sale.
Pause before signing a binding sale or transfer. The date and terms can matter. Ask a tax practitioner to test CGT and other tax issues on the actual documents, not only on an estimated sale price.
Questions to Settle Before a Sale
Do the tax work before the deal is fixed. Use a simple list of facts. This can help you see what records are in hand and what a tax practitioner still needs.
- What is being sold?
- Who owns it?
- When was it bought?
- What did it cost?
- What costs were paid to buy?
- What costs will be paid to sell?
- Was it your main home?
- Was any part let out?
- Was any part used for work?
- What proof is on file?
- When will the deal be signed?
- What other tax may apply?
When a Second View May Help
Get tax help before a gift, sale to a family member or transfer to a trust or company. The fact that the buyer is known does not make the tax result simple.
Get help if you lack old cost records. There may be ways to find proof, but do not make up a number. A sound file is worth more than a rough guess used to close a sale fast.
Check the net cash result. The sale price can look large while debt, tax and costs take a share. The amount left for the next goal is the number that needs to fit the plan.
A Calm Next Step
Do not wait for the buyer to ask for proof. Make the asset file while you own it. A date, cost and invoice can be hard to find years later. A clear file gives the tax work a sound base.
Keep the sale goal in view. Tax is one part of the result. The cash left after debt, tax and costs needs to fit the next plan, such as a home, retirement or a new investment.
Worked Example
Assume a person sells shares for R800,000. The starting point is not 18% of R800,000. The person gathers the purchase proof, trading costs and sale costs, then works out the gain before applying the annual relief and the current inclusion rules.
For a primary home, the sum needs additional facts. The owner checks whether it was the usual residence, whether part was used for trade, the dates of ownership and the records of upgrades. The example is illustrative and is not a tax return sum.
Reality Check
- CGT rules and reliefs can change. Check the SARS facts that apply to the relevant tax year.
- A deal can involve costs and taxes beyond CGT.
- The timing of a signed deal can matter. Obtain advice before a binding deal is entered into.
Common Mistakes
Applying a rate to the full sale price
CGT normally concerns a gain after base cost and key rules. Treating the sale price as the taxed gain can overstate or misstate the result.
Assuming every home sale is fully exempt
Primary-residence relief has rules and limits. Rental use, trade use and other facts can affect the sum.
Leaving records until the sale
Old contracts, invoices and records can be hard to recover. Maintain a file while the asset is owned.
What This Framework Does Not Decide
This framework does not calculate CGT for a deal, classify an amount as capital or revenue, or recommend a sale. It cannot replace tax advice that considers the asset, owner, date, records, other taxes and the current tax year.
Frequently Asked Questions
Does CGT apply to every property sale?
Not every sale has the same result. Primary-residence relief and other rules can apply, but they have rules. A rental or business-use component may need separate check.
Do shares trigger CGT?
A sale or other sale or transfer of shares can create a capital gain or loss, subject to the facts. Keep purchase and sale records and ask for tax advice on a big deal.
When is tax due?
The timing depends on the sale or transfer, the tax year and the taxpayer’s filing position. Obtain advice before signing or implementing a deal.
Financial Clarity Review
Collect purchase records, sale terms, records, improvement invoices and facts about how the asset was used. A Financial Clarity Review can organise the financial proof before a tax practitioner calculates the deal.
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Sources and Further Reading
Primary sources were checked on 2 August 2026 where this article uses time-sensitive regulatory, tax, retirement or market-structure information. Recheck all rules, limits and product terms immediately before publication.
Important Disclosure
This article is provided for general educational and informational purposes only and does not constitute financial, investment, tax or legal advice. The examples and illustrations are based on assumptions that may not apply to your circumstances and are not guarantees of future outcomes. Before making a financial decision, consider obtaining advice appropriate to your objectives, financial situation and needs.