The letter you have 21 days to answer.

Most people who get a letter from SARS asking for supporting documents do one of two things.

They panic. Or they put it in a drawer.

Both are understandable and both are expensive, so it is worth understanding what the letter actually is, what the clock on it means, and what happens on the day it runs out.

A verification is not an audit

SARS uses two words for two different things, and people use them interchangeably.

A verification is a request to substantiate what you already declared. You said you paid R48,000 into a retirement annuity. SARS would like to see the certificate. You claimed medical expenses your scheme did not cover. SARS would like the invoices. It is not an accusation. It is a request for the paperwork behind a number on a return you signed.

An audit is broader. SARS examines the underlying records, and it is not bound to the single item that triggered it, or to a single year of assessment. An audit that starts with a travel claim can end up asking about a property you sold three years ago.

Most letters are verifications. Most verifications end quietly. But the two arrive looking almost identical, and both carry a deadline.

The 21 business days

You generally have 21 business days to respond.

Business days, not calendar days — so a request landing in mid-December buys you longer than the same request in March. It is still less time than it sounds, because the clock does not care that the medical aid certificate takes ten days to arrive, or that the section 18A receipt for a donation you made in November is in an email account you no longer use.

The work in a response is not the writing. It is the retrieving.

What happens when the clock runs out

Nothing dramatic. That is what makes it dangerous.

If you do not respond, SARS may raise a revised assessment using the information it already has. Read that again, because it is the part people miss: the information SARS already has is, by definition, the information that prompted the query. The assessment gets built without the documents that would have explained the number.

Then two things follow.

The first is the amount itself, which is now a debt.

The second is an understatement penalty, which under the Tax Administration Act can reach 200% of the shortfall, depending on the behaviour SARS decides it is looking at. Careless is treated differently from intentional. The gap between the two is enormous, and which side you land on is influenced by how you responded — or whether you responded at all.

Interest runs on top of both.

None of this is unwindable. You can object, you can appeal, you can request a suspension of payment. But every one of those is slower, harder and more expensive than answering a letter on time. An objection is a formal process with its own deadlines and its own evidentiary requirements. A reply to a verification is an email with attachments.

Silence is the worst possible answer

There is a belief, and I have heard it more than once, that not responding buys time.

It does the opposite. It converts a request for documents into an assessment, and an assessment into a collection process. It also removes the only thing you had going for you, which was the appearance of a taxpayer with nothing to hide.

If the documents genuinely do not exist — the logbook was never kept, the invoices were thrown away — that is a different conversation, and a manageable one. But it has to be had inside the 21 days, not after.

If something actually was left out

This is the part almost nobody publishes, and it matters most to the people worrying most.

A verification does not automatically close the door on the Voluntary Disclosure Programme under section 226(2) of the Tax Administration Act. Receiving a letter is not, by itself, the end of that option. And from 1 March 2026, remission of interest can be requested together with a VDP application.

The window is narrow and it narrows further the longer you wait, particularly once a verification escalates into a full audit. But if you know something was left off a return — a rental income, a foreign account, a disposal you did not think was taxable — say so at the first conversation with whoever is helping you. It changes the options available to you. Saying it in month three, after a revised assessment has been raised, changes far fewer.

What a proper response looks like

A response pack is not a pile of attachments.

It is a covering letter that answers the SARS letter item by item, in the order SARS asked. A contents page. Annexures behind dividers, each one referenced from the covering letter. A reconciliation that ties every figure back to the ITA34, so the person reading it can follow the arithmetic without doing it themselves. Continuous page numbering. One PDF, in the format SARS accepts.

The reason for the formality is not ceremony. It is that a SARS official has a queue, and a response they can follow in five minutes gets a different outcome to one they have to reconstruct.

What to do this week

If a letter has arrived:

Read the date on it and count 21 business days forward. Write that date down.

List every document it asks for, and next to each one write where it is going to come from and how long that will take. The ones sourced from a third party — medical scheme, retirement fund, bank, employer, a section 18A donee — start those today. They are the ones that will run you out of time.

If anything on the list does not exist, or if anything was left off the return, get advice before you reply rather than after.

And if the letter arrived weeks ago and the date has already passed, that is worth a conversation too. Later is worse than earlier, but it is considerably better than never.

More detail on how a response pack is put together is on our SARS verification & audit response page.