Working From Home? Here’s How South African Sole Proprietors Can Legally Slash Their Tax Bill

Your spare bedroom could be worth thousands at tax time. But only if you claim it properly.

If you run your business from home as a sole proprietor, SARS lets you deduct a chunk of your household expenses against your trade income. The problem is that most self-employed South Africans either underclaim because they’re nervous or overclaim because they don’t know the rules. Both cost you.

Here’s the good news. Sole proprietors have it easier than salaried employees on this one. You don’t need a letter from your employer. You don’t need to prove that anyone required you to work from home. And you’re not stuck with the strict “exclusive use” rules that catch out so many remote workers.

So here’s how to do it properly.

Why sole proprietors have the easier path

When you’re self-employed, SARS treats your earnings as trade income under the Income Tax Act. Your home office is just a cost of running the business. No different, in principle, to a coffee shop owner deducting the rent on their premises.

You still need to meet a few requirements. But they’re practical ones, not the hoops a salaried person has to jump through.

Do you actually qualify?

Before you start working out numbers, check these three things.

First, you need to use the office regularly. Not every single day, but consistently. It should be a real part of how you run your business, not a spot where you answer the odd email on a Sunday.

Second, the space must be set up for work. A desk, a computer, a filing cabinet, a printer, whatever your trade needs. A laptop propped on the kitchen counter while you’re making dinner won’t hold up if SARS comes knocking.

One thing people get wrong: the office doesn’t have to be a separate room. A clearly defined workspace inside a larger room can still qualify, as long as you’re honest about the proportion you’re claiming.

The formula that decides what you can claim

SARS uses one simple calculation:

(A ÷ B) × Total qualifying costs

Where A is the square metres of your home office, and B is the total square metres of your home, outbuildings included.

So if your office is 15 m² and your home is 150 m², you can claim 10% of your qualifying household expenses.

What counts as a qualifying cost?

You can apportion the following:

  • Rent, if you’re renting
  • Bond interest if you own (the interest only, never the capital repayment)
  • Municipal rates and taxes
  • Electricity and water
  • Repairs and maintenance
  • Cleaning services
  • Security costs on the property

You cannot claim the capital portion of your bond, and you cannot claim capital improvements to the house. SARS is firm on that.

The three kinds of expense you’ll claim

Understanding how SARS sorts your costs is the key to getting the most out of your claim without stepping over the line.

Direct costs relate only to your office, and they’re 100% deductible. Your business internet line, a dedicated work phone, stationery, printer ink, or repainting just the office — all of that falls here.

Indirect costs are the shared household bills covered by the apportionment formula above. You’re claiming the slice that reasonably relates to the business.

Equipment and furniture — laptops, desks, chairs, monitors, that standing desk you talked yourself into — are claimed over their useful life, using SARS’s standard depreciation rates.

How to file it on eFiling

On your ITR-12, your apportioned home office expenses are reported in the “Local Business, Trade and Professional Income” section. That’s where sole proprietors declare business income and the expenses that produced it.

Don’t just type in a round number and hope. SARS expects you to have a proper calculation ready if they ask.

The paperwork that protects you

Home office claims are on SARS’s radar. That means documentation isn’t optional; it’s your shield. Keep this lot for at least five years:

  • A floor plan showing the measured office area
  • Utility bills showing your home address
  • Invoices and receipts for every expense you’ve claimed
  • A worksheet showing exactly how you got to each figure
  • A few photos of the workspace, to show it’s genuinely set up for business

If SARS ever queries the return, a tidy file of evidence turns a scary audit into a short email exchange.

Where people trip up

The usual mistakes are claiming the full bond repayment rather than just the interest, inflating the square metre ratio, mixing personal and business costs on the same invoice, and failing to keep records at the time. Any one of these can sink your whole claim, and in bad cases trigger penalties.

When to get a tax practitioner involved

If your setup is simple, one room, one business, clean records, you can handle this yourself on eFiling with a bit of care.

But get a practitioner to review your approach if you run more than one income stream, share the space with a spouse’s business, own rather than rent, or are claiming a big amount for the first time.

Done properly, a home office deduction can save a sole proprietor tens of thousands of rand over the years. Done carelessly, it’s one of the fastest routes to a SARS verification letter.

If you want help with your own claim, from measuring the room to hitting submit, get in touch. We’ll make sure you claim every rand you’re owed, and not a cent more.