SARS Already Knows More Than You Think: Why the Common Reporting Standard Matters
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When taxpayers assume their offshore income is invisible to South African Revenue Services (SARS) their assumption is incorrect. Through the Common Reporting Standard (CRS), financial institutions around the world automatically share financial account information with tax authorities, including SARS. If a South African tax resident holds offshore accounts or assets generating income abroad, that information may already be sitting in SARS’ systems.
To understand why this matters, accountants first need to understand how South Africa taxes foreign income.
Residence vs Source: How South Africa Taxes Income
Countries generally tax income using one of two approaches: the source principle or the residence principle.
Under a source-based tax system, a country taxes income that is generated within its borders, regardless of where the taxpayer lives.
Under a residence-based tax system, a country taxes the worldwide income of its tax residents, even if the income is earned in another country.
South Africa applies a hybrid approach that includes both residence and source principles, but they apply to different taxpayers.
South African tax residents are taxed on their worldwide income, regardless of where it is earned in line with the residence principle. For example, a South African resident must declare:
📘Salary earned overseas
📘Rental income from foreign property
📘Foreign interest and dividends
📘Profits from offshore investments.
📘Even if the income was earned outside South Africa, it must still be reported in the South African tax return.
Non-residents are only taxed on income that arises from a South African source. For example, a non-resident may be taxed in South Africa on:
📘Rental income from property located in South Africa
📘Employment income earned for work performed in South Africa
📘Business income generated from South African activities
Income earned outside South Africa by a non-resident is generally not subject to South African tax.
Why CRS Exists
Historically, tax authorities struggled to verify foreign income because offshore financial activity was difficult to detect. The CRS was introduced to address this gap. It is a global system that allows tax authorities to automatically exchange financial account information with each other.
Financial institutions identify account holders who are tax residents in other countries and report certain information to their local tax authority. That information is then shared with the relevant foreign tax authority.
Because South Africa participates in CRS, SARS receives financial information about South African tax residents who hold accounts or financial assets in other participating jurisdictions.
A list of jurisdictions that participate in the CRS information exchange framework is available here.
What Information Does SARS Receive
Through CRS exchanges, SARS may receive information such as:
Name and address of the account holder
Country of tax residence and tax number
Financial account numbers
Account balances or values
Interest, dividends or other investment income
Proceeds from the sale of financial assets.
SARS can then compare this information with what the taxpayer declared in their tax return.
Foreign Income Must Still Be Declared — Even If Tax Was Paid Overseas
A common misunderstanding among taxpayers is that foreign income does not need to be declared in South Africa if tax was already paid in the foreign country. That is incorrect.
Because South Africa taxes residents on worldwide income, foreign income must still be disclosed in the taxpayer’s South African tax return.
If tax has already been paid in the foreign jurisdiction, the taxpayer may claim foreign tax credits to avoid double taxation. These credits reduce the South African tax payable on that income.
However, whether foreign tax was paid or not, the reporting obligation remains. The income must still be declared to SARS.
Why This is Important
CRS has fundamentally changed how SARS verifies offshore income.
Instead of relying solely on taxpayer disclosures, SARS now receives large volumes of financial information directly from foreign tax authorities. That information can be matched against tax returns using data analytics systems.
For accountants, the implication is simple: if a client has foreign financial interests, assume that SARS may eventually receive the same information.
Ensuring foreign income is properly disclosed is therefore a key part of managing client compliance risk.
A Practical Example - 🏠 Foreign Rental Income
Lets look at what happens when a South African tax resident owns a rental property in the United Kingdom and earns rental income from tenants.
🔹The rental income is paid into a UK bank account.
Under CRS due-diligence rules, the bank identifies the account holder as a South African tax resident and reports the account details to the UK tax authority.
🔹That information is automatically shared with SARS.
If the taxpayer’s South African tax return does not reflect the foreign rental income, SARS may identify the mismatch and request an explanation, initiate a verification, or conduct an audit.
🔹 What if the taxpayer already paid tax in the UK?
The income must still be declared in South Africa because South African residents are taxed on their worldwide income. However, the taxpayer may claim a foreign tax credit for the tax already paid in the UK. This credit reduces the South African tax payable on the same income, preventing double taxation.
📎The key point is that paying tax overseas does not remove the reporting obligation in South Africa. The income must still be disclosed, and the foreign tax paid must be reflected correctly in the South African tax return.
The Bottom Line
Global tax transparency is increasing every year. Offshore income is no longer hidden behind bank secrecy.
Accountants who understand how systems like CRS work are better positioned to protect their clients from compliance risks, and to position themselves as trusted advisors in an increasingly transparent global tax environment.
