It's tax season, and Nomsa, a Durban wedding photographer, is at her kitchen table with twelve months of bank statements and a highlighter. Client deposits sit between grocery runs, school fees and fuel. There's a R1 800 online purchase she can't place: a lens filter, or her nephew's birthday present?

She gives up on half the small items. That means she either claims less than she's entitled to, or claims expenses she can't prove if SARS asks.

If you're a sole proprietor running everything through one bank account, you're probably in the same position. The good news is that it's one of the easiest problems in business to fix. Here's how to separate personal and business finances, step by step.

Why One Bank Account Costs Sole Proprietors Money

Legally, a sole proprietorship and its owner are the same person. Your business profit is added to any other income on your ITR12, and you pay personal income tax on the total. That's why mixing accounts feels natural.

But SARS still draws a hard line. Only expenses incurred in producing your business income are deductible; private and domestic expenses are not. When both run through one account, the burden of proving which is which falls on you. The result is usually one of these:

• Missed deductions, because you can't remember or prove what a transaction was for

• Disallowed claims, when SARS requests supporting documents and the paper trail is unclear

• No real view of profit, so provisional tax becomes a guess

• Weaker credit applications, because lenders want clean business statements, not a blend of income and household spending

6 Steps to Separate Personal and Business Finances

You don't need to register a company to do this. These steps work for any sole proprietor:

1. Open a dedicated business account. Ideally a business account in your trading name; at minimum, a second account used for nothing but the business. Compare monthly fees, since some business accounts cost more than you need at this stage.

2. Route all business income into it. Update the banking details on your invoices, quotes, payment links and card machine.

3. Pay business expenses only from it. Get a card linked to the account and move business debit orders and subscriptions across, such as software, business insurance and your website hosting.

4. Pay yourself a fixed amount. Transfer a set sum to your personal account on a regular schedule, just as an employer would. These transfers are drawings, not expenses: you're taxed on business profit, whatever you withdraw.

5. Set aside tax as you earn. Move a fixed percentage of every payment into a separate savings pocket for provisional tax (and VAT, if you're registered). Often 20–30% is enough, but the right figure depends on your income.

6. Connect the account to accounting software. Bank feeds in Xero, Sage or QuickBooks pull in every transaction automatically. Categorise them weekly, while you still remember what they were.

How to Handle Mixed-Use Expenses

Some costs are genuinely shared between your business and your private life. The rule is simple: claim only the business portion, and be able to show how you calculated it.

Home office

You can deduct home office costs only if part of your home is specifically equipped for your work and used regularly and exclusively for it. A desk in the lounge doesn't qualify. If yours does, claim a share of rent or bond interest, rates, electricity and cleaning based on floor area. A 12 m² office in a 120 m² home means 10% of those costs.

Vehicle

Keep a logbook of every business trip: date, destination, purpose and kilometres. SARS routinely disallows travel claims that aren't backed by one.

Phone and internet

Work out a reasonable business percentage and apply it consistently, or take out a separate business contract. If you pay a mixed expense from the business account, record the private portion as drawings.

Keep the Records SARS Expects

SARS can ask for proof of anything you claim, and sole proprietors are often selected for verification. Generally, you must keep records for five years from the date you submit the return. That includes:

• Tax invoices and receipts for every business expense

• Business bank statements

• Your vehicle logbook

• Home office evidence, such as a floor plan, photos and the calculation behind your claim

Digital copies are fine. Most accounting apps let you photograph a receipt and attach it to the transaction straight away. If keeping up feels like a second job, outsourcing your bookkeeping to a firm like Saber Accounting keeps your records SARS-ready all year, not just in tax season.

When Separation Becomes a Legal Requirement

Once your profits grow, it may make sense to move your business into a private company (Pty) Ltd. A company is a separate legal entity under the Companies Act, so keeping its money separate isn't optional. It also opens up options like the small business corporation tax rates. Getting into the habit of separation now makes that move far easier later.

Start With One Account This Month

Separating personal and business finances isn't about bureaucracy. It's about knowing what your business actually earns, claiming every deduction you're entitled to, and having proof ready when SARS asks. For South African sole proprietors, opening a dedicated account and paying yourself a fixed amount is the single change that makes everything else easier, from provisional tax to applying for finance. Make the switch this month, and next tax season will look very different from Nomsa's kitchen table.

Ready to get your finances in order? At Saber Accounting, we help South African small businesses stay compliant, cut unnecessary costs, and make smarter financial decisions. Whether you need help with bookkeeping, tax returns or setting up your accounting software, our expert team is here. 👉 Book a free consultation today