Many South Africans working abroad who rely on a Tax Residence Certificate ("TRC") to support a Double Tax Agreement ("DTA") non-residency position are discovering that the certificate does not always cover the earliest period of foreign employment for which tax treaty relief was claimed.

This issue arises because, in some jurisdictions, a taxpayer's first TRC does not necessarily correspond with the date on which they departed South Africa, commenced employment abroad or, indeed, the date from which they contend that exclusive treaty residence arose.

The consequence is that the taxpayer may face questions from the South African Revenue Service ("SARS"), as well as having to explain and defend an initial period of foreign employment for which a TRC has not yet been issued. 

This may require additional supporting evidence to SARS to substantiate their treaty residence position and demonstrate that foreign employment income during that initial period should remain non-taxable in South Africa.

As SARS continues to increase its scrutiny of DTA-based non-residency applications, this timing mismatch may become one of the next significant battlegrounds in international tax residency disputes.

Says Delano Abdoll, Legal Manager: Cross-Border Taxation at Tax Consulting South Africa:

"One of the practical challenges we are increasingly encountering is that the legal date from which a taxpayer is regarded as exclusively resident in the other Contracting State under the applicable DTA does not always align with the period covered by the first Tax Residence Certificate issued by the foreign revenue authority. The issue is therefore often not whether the taxpayer ultimately qualifies for treaty relief, but how they evidence the earliest period during which that relief is claimed."

When the Dates Do Not Align

Consider a taxpayer who permanently relocates from South Africa to Oman during September.

Upon arrival, they start long-term employment, establish a permanent home and begin building their personal and economic life in Oman.

From a treaty perspective, and assuming the treaty tie-breaker tests are satisfied, they may contend that exclusive residence in Oman arose from that point.

However, the Omani tax authority may only issue a TRC covering a later administrative period, depending on its domestic processes and the operation of its tax year.

The taxpayer is therefore left with a gap.

While they may ultimately obtain a valid TRC, it may not extend back to the precise date from which they contend that exclusive treaty residence arose under the applicable DTA.

A Practical Challenge Rather Than a Legal One

This issue should not be confused with the legal test for treaty residence.

Whether a taxpayer qualifies for exclusive residence under a DTA remains determined by the relevant treaty provisions and the taxpayer's underlying facts and circumstances.

Rather, the challenge is evidentiary. SARS may accept that the taxpayer ultimately became treaty resident in the other jurisdiction but still require evidence establishing precisely when that position first arose.

Where the administrative practices of the foreign revenue authority do not produce a TRC that aligns with the taxpayer's relocation date, SARS may seek further explanation and supporting evidence to establish how treaty residence is said to have arisen during that initial period abroad.

As SARS has previously indicated, the relevant date is not simply the date on which the taxpayer left South Africa, but the date upon which the requirements for exclusive residence under the applicable DTA are satisfied.

Why the Host Country Matters

This issue highlights an often-overlooked aspect of DTA planning. Documentary requirements can differ significantly between jurisdictions.

Not every country's tax administration operates in the same way. Some jurisdictions issue TRCs based on calendar years. Others align them to a different fiscal year.

Some require a minimum period of residence before issuing a certificate, while others only issue certificates retrospectively once certain administrative requirements have been satisfied.

As a result, two taxpayers who leave South Africa on exactly the same day may face very different evidentiary challenges depending entirely on the country to which they relocate.

The legal analysis under the DTA may be similar.

The documentary evidence available to support that analysis may not.

The Risk for South Africans Abroad

Where SARS questions the effective date of treaty residence, the practical consequence may be that the taxpayer is required to justify why foreign employment income earned during that initial period should qualify for treaty relief.

The issue therefore becomes less about whether the taxpayer eventually obtains a TRC and more about whether sufficient evidence exists to support the period before that certificate takes effect.

In many cases, this may require a broader evidentiary package, including employment contracts, immigration documentation, accommodation records and other contemporaneous evidence showing that the taxpayer had already established treaty residence under the relevant DTA.

Recent SARS verification requests indicate an increasing focus not only on whether a taxpayer holds a valid TRC, but also on whether the effective date of treaty residence claimed can be substantiated by contemporaneous evidence. As verification becomes more detailed, taxpayers should expect greater scrutiny of any period that falls outside the dates reflected on their first TRC.

Looking Ahead

The increasing focus on effective dates, supporting documentation and treaty analysis suggests that DTA applications are becoming progressively more evidence-driven.

Taxpayers should therefore avoid assuming that obtaining a TRC automatically resolves the entire treaty residence analysis.

Equally important is understanding whether the period covered by that certificate aligns with the date from which treaty relief is claimed and, where it does not, ensuring that the intervening period can be supported by appropriate evidence.

As SARS continues refining its approach to international tax residency, taxpayers should not only ask whether they qualify for treaty relief.

They should also ask whether they can substantiate the precise period for which that relief is claimed.

Written by Tax Consulting SA