Provisional tax filing

What to give a practitioner so the estimate holds up

Ensure your provisional tax estimate holds up with SARS. Learn what information to give your practitioner so the figure sticks and avoids penalties.

When you ask a tax practitioner for a provisional tax estimate, you're really wondering: will this figure stick, or will I be hit with an adjustment and a penalty later? The answer hinges almost entirely on what information you hand over. A vague brief produces a vague estimate. A complete, honest picture produces an estimate that actually holds.

Many people assume their practitioner will magically know their full financial story. They don't. You must volunteer it deliberately. The estimate is only as solid as the data behind it, and SARS will test it against your actual filing—so what you withhold now becomes a liability later.

Information that protects your estimate

Start with your previous year's tax return and assessment from SARS. Your practitioner needs the actual assessed income, not what you think it was or what you remember earning. They also need your most recent provisional assessment letter (if you received one), and any correspondence from SARS about your tax position.

Next, walk them through your current year's business model in detail. If you're a freelancer, have your invoices and bank statements for the period ready—not a rough tally. They'll want to see exactly which clients paid you when, and how much. If you run a retail operation or services business, your turnover figures matter: monthly sales, any cash income, refunds issued, returns. If your income source has changed since last year—you took on a second income stream, you lost a major client, you hiked your fees—flag it explicitly and explain the timing.

Bring documentation of any deductions you plan to claim. Not just expenses you remember; actual receipts, invoices from your suppliers, proof of payments. Vehicle costs need odometer readings and business-use percentages. Home office claims need the calculation of your work space. Professional fees, subscriptions, training courses—anything that reduced your taxable profit needs a paper trail. Your practitioner can then build a defensible deduction profile into the estimate, rather than guessing.

If your income is seasonal or lumpy, tell them bluntly. Don't smooth it out mentally or present an average. Show them the actual monthly or quarterly rhythm. If you know December will be lean, say so. If you're expecting a big contract to land in Q3, share the signed offer or email confirmation. They need the real shape of your year, not the shape you wish it had.

What kills an estimate's credibility

The most common problem is withholding information about reduced income or new expenses, hoping to minimise your provisional bill. This backfires. If you hide a drop in turnover, your estimate stays high, you underpay, and you face an adjustment plus interest. If you claim deductions your practitioner didn't know about, and they weren't in the estimate, the same thing happens when SARS reconciles your actual return.

Also hand over any correspondence or notices from SARS about you personally—a tax audit query, a request for clarity on a prior year, a notice of assessment adjustment. These change how conservative or aggressive your estimate can be. Your practitioner needs to know if SARS is already scrutinising your account.

If you receive irregular income—an inheritance, a rental payment that's lumpy, a dividend from a company—mention it now. Provisional tax estimates can look absurd if a one-off windfall isn't acknowledged; your practitioner may need to build in an adjustment for the following year instead.

Making the estimate stick

After you hand everything over, ask your practitioner to walk you through their assumptions. What income figure are they using? What deductions? What's their reasoning for the provisional amount? This isn't about challenging them; it's about confirming they understood your situation correctly. If they say "I'm assuming you'll earn what you earned last year" and that's wrong, correct them now.

Keep notes of what you shared, dated. When you file your actual return months later, you and your practitioner can reference this brief and confirm the estimate was reasonable given the facts you knew at the time. That paper trail protects you both if SARS questions it.

When you're ready to book a practitioner for this work, find one who'll spend time on the intake conversation, not rush through it. On Strove, you can ask verified tax practitioners upfront about their process for gathering information and how they handle estimates that need to be defended. The right one will see your completeness as a feature, not a burden.

Common questions

Can my practitioner estimate provisional tax without last year's figures?: They can, but it's riskier. Without your prior year's assessed income and SARS correspondence, they're working blind. Always provide your last tax return and assessment letter so the estimate is anchored to actual history rather than guesswork.
What happens if I tell my practitioner less income than I really earned?: Your estimate stays lower, you underpay provisional tax, and when you file your actual return, SARS will adjust it upward and charge interest and possibly a penalty. It's better to estimate conservatively upfront with full facts than to face a surprise bill later.
Do I need receipts for every expense I want in my estimate?: For the estimate itself, you need to show your practitioner what expenses you've actually incurred and paid for. They'll then factor those into the calculation. Come year-end, you'll need all receipts and documentation to back up your actual return, so gather them now anyway.
How often should I update my practitioner if things change mid-year?: If your income or expenses shift materially—a big client leaves, you hire staff, your turnover doubles—tell them as soon as you know. They may be able to adjust your estimate to avoid a large reconciliation later, or at least flag it so you're not surprised when SARS reconciles the return.

Find a verified provider on Strove

Compare vetted provisional tax filing providers, check their credentials, and book or request a quote — all in one place.

Find a Business

More on Provisional tax filing

Information that protects your estimate

What kills an estimate's credibility

Making the estimate stick

Common questions

Can my practitioner estimate provisional tax without last year's figures?

They can, but it's riskier. Without your prior year's assessed income and SARS correspondence, they're working blind. Always provide your last tax return and assessment letter so the estimate is anchored to actual history rather than guesswork.

What happens if I tell my practitioner less income than I really earned?

Your estimate stays lower, you underpay provisional tax, and when you file your actual return, SARS will adjust it upward and charge interest and possibly a penalty. It's better to estimate conservatively upfront with full facts than to face a surprise bill later.

Do I need receipts for every expense I want in my estimate?

For the estimate itself, you need to show your practitioner what expenses you've actually incurred and paid for. They'll then factor those into the calculation. Come year-end, you'll need all receipts and documentation to back up your actual return, so gather them now anyway.

How often should I update my practitioner if things change mid-year?

If your income or expenses shift materially—a big client leaves, you hire staff, your turnover doubles—tell them as soon as you know. They may be able to adjust your estimate to avoid a large reconciliation later, or at least flag it so you're not surprised when SARS reconciles the return.