What does SARS really know about my bank account?
Bank data, AI and how SARS is increasingly using technology to monitor tax compliance
“But how will SARS know?”
It is a question accountants hear surprisingly often.
It may relate to interest earned, a second source of income, money moving through a bank account, an investment, or even someone who has never registered for tax. The short answer is that SARS is increasingly less dependent on only the information you personally enter on your tax return.
Banks, employers, medical schemes, retirement funds and various other institutions already provide prescribed third-party information electronically to SARS. This data is used, amongst other things, to pre-populate tax returns and enable Auto Assessments.
At the same time, SARS is modernising its tax administration. Its Modernisation 3.0 White Paper envisages an intelligent digital system incorporating data science, artificial intelligence (AI), big data and intelligent case management. Its 2025/26 Annual Report also refers specifically to data science, machine learning and advanced analytics as part of improving revenue collection.
So what does this mean for an ordinary taxpayer?
Let us start with the question that probably attracts the most attention.
What does SARS really know about my bank account?
There are plenty of stories about the access SARS supposedly has to our bank accounts.
You may have heard:
“SARS can simply see everything in your bank account.”
That is an oversimplification and not how we would describe the position.
What we can establish from SARS' own published documentation is that banks and other prescribed financial institutions are required to report certain financial data electronically to SARS.
An important mechanism is IT3(b) third-party reporting. SARS publishes technical specifications and guidance governing these data submissions. The published documentation contains sections dealing with matters including:
account information;
account-holder details;
financial information;
credits and debits;
income and payments;
interest and certain other investment income; and
withholding tax on interest, where applicable.
The important point is therefore not that SARS necessarily has some form of unrestricted access to your internet banking.
The point is that prescribed financial data is already being reported to SARS in a structured manner by banks and other financial institutions.
That distinction matters.
Your tax return does not exist in isolation
Take a simple example.
John submits a tax return declaring a certain amount of income. That tax return is not necessarily the only source of information available to SARS. Depending on John's circumstances, SARS may already have received prescribed information from his:
employer;
bank or other financial institution;
medical scheme;
retirement fund;
insurer;
trust; or
another third-party data provider.
SARS also confirms that taxpayers can access and query certain third-party data certificates submitted on their behalf by financial service providers.
Think of these as pieces of a puzzle.
Your employer has one piece. Your bank has another. Your medical scheme may have another.
Modern technology increasingly allows large volumes of this information to be analysed together and potential discrepancies or areas of risk to be identified.
Where does AI come into the picture?
For many people, “AI” means something like ChatGPT. In tax administration, its potential application is much broader.
The SARS Modernisation 3.0 White Paper describes a future tax administration incorporating data science and AI, with intelligent case management, big data and a greater move towards ongoing risk profiling. In simple terms:
Computer systems can analyse and compare enormous amounts of information much faster than an individual could do manually.
That does not mean we should claim that an AI system independently decides that a taxpayer is guilty of tax evasion. It does mean technology can help identify inconsistencies and risks that may warrant further attention.
For taxpayers, the practical question is therefore changing from:
“Will SARS know?”
to:
“Does my tax return agree with my records and with the third-party information SARS may already have received?”
“But I am not registered for tax”
This is another important misconception.
Not being registered for tax does not necessarily mean that no information relating to you can be reported to SARS. Third-party reporting consists precisely of prescribed data provided to SARS by third parties.
This does not mean that everyone with a bank account owes tax or is necessarily required to submit a tax return. That depends on the individual's circumstances and the applicable tax rules.
The practical lesson is simply:
Do not confuse “I am not registered” with “SARS cannot have any financial information about me”.
What about a foreign bank account?
The information network does not necessarily stop at South Africa's borders.
South Africa participates in international systems for the automatic exchange of certain financial account information, including the Common Reporting Standard (CRS). SARS' published documentation describes CRS as a mechanism for obtaining financial account information from financial institutions and automatically exchanging it between participating jurisdictions annually.
The practical lesson is straightforward:
Do not simply assume that money or investments held offshore fall outside the international tax-information network.
The South African tax treatment of offshore income, assets and accounts depends on the particular circumstances and should be professionally assessed.
Auto Assessments show that third-party data is already important
We do not have to speculate about how third-party information might one day be used. Auto Assessments already demonstrate its practical application. SARS bases Auto Assessments on information received from sources including employers, banks, medical schemes, retirement funds and insurers.
There is, however, an important warning:
Automated does not necessarily mean complete or error-free.
SARS' own guidance requires taxpayers to review their Auto Assessment information. Incorrect or incomplete information needs to be addressed.
This is not merely theoretical.
SARS reported that during the 2025 filing season it created 81,588 verifications because of missing or unmatched employer IRP5 data, 27,436 relating to missing or unmatched retirement-contribution data, and 16,819 relating to missing or unmatched medical data.
Never simply assume:
“It is already on eFiling, so it must be correct.”
The next step: VAT is becoming more digital too
This development does not end with personal income tax.
In 2026, SARS launched a consultation process around a new digital VAT model incorporating e-Invoicing, e-Reporting and a more structured, closer-to-real-time flow of VAT transaction data.
The consultation document also refers to advanced AI and analytical tools for analysing data across the VAT value chain for discrepancies and risks.
It is important to retain the distinction: this is a proposed modernisation model and should not be presented as a system that has already been fully implemented.
For business owners, however, the direction is important. Accurate digital accounting records, valid tax invoices and reliable transaction data are likely to become even more important.
What should you do in practice?
The answer to smarter tax administration is not panic.
It is better administration.
DO
1. Keep your accounting records up to date
Do not wait until tax season before trying to reconstruct a year's worth of bank transactions. Businesses should regularly reconcile their bank accounts and accounting records.
2. Keep personal and business transactions separate where possible
This makes both accounting and the explanation of transactions considerably easier.
3. Check third-party information
Compare your IRP5/IT3(a), medical scheme certificates, retirement-fund documentation, interest certificates and investment statements with the information appearing on your tax return.
4. Check your Auto Assessment
SARS' own guidance requires taxpayers to review their Auto Assessment information.
5. Keep documents explaining unusual transactions
A large deposit into your account is not automatically taxable income. It might, for example, be a loan or a transfer between your own accounts. Keep documentation demonstrating the true nature of the transaction.
6. Address known problems proactively
If you already know that previous declarations were incorrect or incomplete, obtain professional advice about the appropriate process for correcting your position.
DON'T
1. Don't base a tax decision on “SARS will never know”
That is an increasingly poor assumption in a data-driven tax environment.
2. Don't assume cash means tax-free
The method by which you receive payment does not, by itself, determine its tax treatment.
3. Don't assume pre-populated information is correct
Check it against your own documentation.
4. Don't discard supporting documents simply because an amount was not income
Those documents may be exactly what you need to demonstrate why the amount was not taxable income.
5. Don't ignore or casually respond to a SARS query
Understand what is being requested and ensure that your supporting documents and explanation are consistent with your tax declarations.
The biggest change is actually how we should think about tax
Many taxpayers still think of tax as something that happens once a year when a tax return is completed.
That view is becoming increasingly outdated.
SARS' strategic direction is towards greater use of data, further digitisation and more effective detection of non-compliance.
The best response is to get your administration right:
Record the transaction correctly when it happens.
Keep the supporting document.
Keep your accounting records up to date.
Make sure your tax declarations are complete and correct.
And if something is wrong, address it before it becomes a bigger problem.
CRUX Konsult's practical message
Technology is changing quickly, but the fundamentals of good tax compliance remain much the same:
Complete records. Accurate declarations. Supporting documentation. Timely action.
If you are unsure whether your personal tax, business, company or trust records and tax declarations are complete and correct, you do not have to wait until SARS asks the first question.
Contact CRUX Konsult for a targeted review of your tax and compliance position. We would rather help you identify a problem early than have you explain it later under pressure.
This article provides general information and is not a substitute for professional tax, legal or financial advice based on your particular circumstances.
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