Capital Gains Tax Doesn’t Care What You Remember — It Cares What You Can Prove

Capital Gains Tax is probably one of those things you’ve heard of, know vaguely has something to do with selling property, and assume you’ll figure out when the time comes.

But what you do — and what you keep — while you own a property could matter a great deal when you eventually put up a For Sale sign.

Most of us don’t buy or renovate our homes with Capital Gains Tax in mind. We buy a property, make it our own and, over the years, spend money maintaining and improving it. Perhaps we replace an outdated kitchen, add a room, put in a swimming pool, upgrade the security or make other significant changes.

The invoice gets paid. The contractor leaves. The photos disappear further down the camera roll. And the paperwork eventually finds its way into a drawer, an email folder or, quite possibly, gets thrown out 10 years later because you assume you don’t need it anymore.

Years later, some of that information could suddenly matter quite a lot.

Firstly, what is Capital Gains Tax?

Capital Gains Tax, or CGT, can apply when you dispose of an asset, including property, and make a capital gain. So basically, it’s a tax that can kick in when you make a profit off your home.

A capital gain is calculated by comparing what you receive when you dispose of an asset with its base cost. Put simply, base cost is what the property has effectively cost you for CGT purposes. It starts with what you paid for the property, but can also include certain qualifying costs associated with buying it, improving it and eventually selling it — so the amount you originally paid isn’t necessarily the only number that matters.

Here’s a simple example of a calculation that might apply to you in 10 or 20 years from now:

You bought your home for R3 million and later sold it for R7 million. Your gain in this instance, before considering other allowable base-cost items, would be R4 million. If it qualifies fully as your primary residence, the R3 million primary-residence exclusion is applied to the capital gain:

• R7m sale price − R3m base cost = R4m capital gain
• R4m capital gain − R3m primary-residence exclusion = R1m remaining capital gain

And even that R1 million is not the amount of tax you pay — CGT rules then determine how much of the remaining gain is included in your taxable income. Your actual base cost may also be higher than the original purchase price, because certain qualifying acquisition costs, improvements and disposal costs can potentially be added to it. That’s exactly why keeping evidence of what you’ve spent on your property over the years can matter.

But isn’t your primary residence exempt?

There is an important exclusion for a qualifying primary residence. From 1 March 2026, the primary-residence exclusion increased from R2 million to R3 million of the capital gain.

That distinction matters: it doesn’t mean your home needs to sell for more than R3 million before CGT becomes relevant. The exclusion applies to the capital gain, not the selling price. For example, if you bought a qualifying primary residence for R1.5 million and later sold it for R2 million, the simplified capital gain would be R500,000 before other allowable base-cost items — comfortably within the R3 million exclusion.

That means many South African homeowners may ultimately have no CGT to pay when selling their primary residence. But that doesn’t mean record-keeping is irrelevant simply because you expect your gain to fall within the exclusion. Properties increase in value. People own homes for decades. Some properties are partly used for business. Some become rental properties for a period. You may not know today what your circumstances will look like when you eventually sell — and tax rules and exclusion amounts can change over time. Keeping the records now means you’re better prepared for whatever applies when that time comes.

What about rental properties and holiday homes?

The R3 million exclusion only applies to the home you ordinarily live in — your primary residence. A rental property, a holiday home you don’t live in full-time, or even a second home used mainly for Airbnb doesn’t qualify for the exclusion at all. The full capital gain on those properties is subject to CGT.

And if a property is used partly as your home and partly for rental or business — a granny flat you let out, or a home office — SARS apportions the gain, so only the portion relating to your actual private use qualifies for the exclusion.

That makes the record-keeping habit even more important for these properties, not less: there’s no R3 million buffer doing the heavy lifting for you.

Here’s what that looks like in practice: say you bought a rental property for R1.5 million and later sold it for R2 million. That R500,000 gain doesn’t get a primary-residence exclusion — but every individual does get an annual capital gains exclusion (R40,000 for the 2026 tax year, rising to R50,000 from 2027) that applies to your total capital gains across all assets disposed of in that tax year, not R40,000 per sale. So if this rental property sale is your only capital gain for the year, the full R40,000 trims the taxable portion down before CGT rules even determine how much of it gets added to your income. But if you also sold shares or another asset at a profit in the same year, both gains are added together first, and only one R40,000 exclusion applies across the combined total.

A quick note if you're reading this from the UK or US

Everything above — the R3 million exclusion, the R40,000 annual exclusion — is specific to South Africa and SARS. If you're in the UK or US, your home's capital gains tax works a bit differently, though the record-keeping principle stays exactly the same.

The UK is actually more generous in one sense: if the home you're selling has been your only or main residence for the whole time you've owned it, Private Residence Relief exempts the entire gain — no cap, no exclusion amount, no R3 million-style ceiling. That relief only shrinks if you didn't live there the whole time (letting part of it out, using a room exclusively as an office, and so on), in which case you get relief only for the portion of ownership that qualified, plus an automatic final 9 months that always counts. Anything outside that relief — a rental property, a second home — is taxed at 18% or 24% depending on your income tax band, with just £3,000 excluded per year.

The US setup is closer to South Africa's model — a flat dollar exclusion rather than a full exemption. You can exclude up to $250,000 of gain (or $500,000 if you're married filing jointly) on your primary residence, as long as you owned and lived in it for at least two of the last five years. Anything above that is taxed at the federal long-term capital gains rate, plus a possible extra 3.8% for higher earners. Like South Africa, rental and investment properties get no exclusion at all — the full gain is taxed.

So the exact numbers change by country, but the underlying lesson doesn't: whichever exclusion or relief you're relying on, you still need to prove your base cost (or "adjusted basis," as the IRS calls it) when the taxman comes asking — and that means keeping the same invoices, receipts and records, regardless of which currency you're doing it in.

So, what can actually count?

This is where things get interesting for property owners. Certain costs associated with acquiring, improving and eventually disposing of a property may form part of its base cost — depending on the circumstances, these can include the original acquisition cost, certain transfer and professional costs, costs associated with selling the property, and expenditure on qualifying improvements or enhancements.

Those improvements can accumulate over many years. Perhaps you added a swimming pool. Built an additional bedroom. Extended the house. Installed a permanent security system. Or undertook a significant renovation. SARS itself uses the example of a swimming pool as an improvement forming part of the base cost of a primary residence.

There is, however, an important distinction to make.

An improvement isn’t the same as a repair

Not every rand you spend on a property can simply be added to its base cost. Generally, repairs and maintenance restore something to its previous condition, while an improvement creates or contributes to a better asset. Replacing something broken, repainting because the existing paint has deteriorated, or carrying out routine maintenance is therefore not necessarily the same as extending your house or adding a new permanent feature — and the line between the two isn’t always obvious. SARS notes that the distinction depends on the particular facts and circumstances.

There’s another important detail: for expenditure on an improvement to qualify for inclusion in base cost, that improvement generally needs to still be reflected in the property when it’s disposed of. That kitchen you installed twenty years ago and then completely replaced ten years later may present a different situation from an extension that’s still part of the house when you sell.

But could you prove what you spent?

You’re unlikely to forget that you built a swimming pool. What you may forget is exactly when you built it, who did the work, what it cost, whether the amount you remember included other work, and where the invoice or proof of payment ended up. That’s the problem with trying to reconstruct the history of a property years after the fact — a R250,000 renovation might be memorable, but the invoice from 2014 probably isn’t.

So, what should you keep?

For significant renovations, additions and improvements, it makes sense to build a record while the information is still easy to find:

• Quotations and invoices
• Proof of payment
• Contracts or agreements with contractors
• Plans and approvals where applicable
• Before-and-after photographs
• Warranties or guarantees
• Contractor details
• A simple description of what work was actually completed

The purpose isn’t to create more household admin — it’s to avoid having to recreate it years later. An old bank statement showing that you paid a contractor R180,000 may prove you paid them, but it doesn’t tell you what the R180,000 was for. The supporting information gives that number context.

Your property has a financial history too

We tend to think of a property’s history in terms of when we bought it and what we eventually sell it for. But a lot can happen in between: a house bought fifteen years ago may have had a new kitchen, solar installation, security upgrades, an additional room, a pool, new outbuildings and several other significant changes along the way — or a rental property may have had years of tenant-related repairs and upgrades. Each project becomes part of the story of that property — and the easiest time to record that story isn’t when you’re preparing to sell. It’s when the work happens.

That’s the gap Axario Home is built to close. Keep property information, home projects, documents, purchases, warranties and trusted professionals together as you go, so every renovation, invoice and photo has a home the moment it happens — not a scramble to find years later.

Keep it now. Work it out later.

Tax rules can be complicated, and whether a particular expense qualifies as part of the base cost of your property will depend on your individual circumstances. If you’re selling a property or calculating a capital gain, it’s worth getting advice from a qualified tax professional.

But keeping the evidence doesn’t require you to understand every tax rule today. You don’t need to decide whether the invoice for a renovation will matter fifteen years from now. You just need to make sure you can still find it if it does.

Because when the tax man asks what you spent, “I think it was about R200,000” isn’t quite the same as being able to prove it.

Start building your property’s record today with Axario Home.

This article provides general information and is not tax or financial advice. Capital Gains Tax and the treatment of property expenditure depend on individual circumstances. Consult SARS guidance or a qualified tax practitioner for advice relating to your property.