SARS 183 Day Rule: Why Most Expats Get This Wrong

The SARS 183 day rule is one of the most misunderstood concepts in South African expat tax. And the reason is simple. There are actually two different “183-day” rules in South African tax law, and they do completely different things. Confuse them and you could lose your exemption, miscalculate your tax residency, or both.

The first is the 183-day test for the foreign income exemption under Section 10(1)(o)(ii). This determines whether your foreign salary qualifies for the R1.25 million tax exemption. The second is the 183-day element of the physical presence test used to determine whether someone becomes a South African tax resident. Same number, totally different rules.

This guide breaks down both rules, explains how they work in practice, and shows you how to count your days so you do not make the mistakes that cost other expats thousands of rands.

The Two 183-Day Rules: Side by Side

Before we go deeper, here is the fundamental difference at a glance.

Notice the key differences. The exemption test counts days outside SA and uses a flexible 12-month window. The residency test counts days inside SA and is locked to the tax year. And they define “a day” differently. For most SA expats, the exemption test is the one that matters, because they are already tax residents by being ordinarily resident.

SARS 183 Day Rule for the Foreign Income Exemption

This is the rule that most SA expats need to understand. If you are still a South African tax resident and you earn a salary abroad, you can exempt the first R1.25 million of that income from SA tax under Section 10(1)(o)(ii). But to qualify, you must pass two days tests within any 12-month period.

You must be physically outside South Africa for more than 183 full days in aggregate during that 12-month window. And within that same window, you must spend a continuous period exceeding 60 full days outside South Africa.

Both tests must be satisfied in the same 12-month period. You cannot use one window for the 183-day count and a different window for the 60-day continuous stretch.

What Counts as a “Full Day”

A full day for the SARS 183 day rule means a complete 24-hour period from midnight to midnight (0h00 to 0h00). This is important because your travel days often do not count as full days.

If you fly out of South Africa on 15 March at 10am, that day does not count as a full day outside SA because you spent part of it inside the country. Your first full day outside SA is 16 March. Similarly, if you arrive back in SA on 20 September at 8pm, that day does not count as a full day outside SA either. Your last full day outside was 19 September.

This means you effectively lose two days on every round trip. It sounds like a small detail, but if you are close to the 183-day threshold, these travel days can make or break your exemption.

The Rolling 12-Month Window

Unlike the tax year, which is fixed from 1 March to 28/29 February, the 12-month period for the SARS 183 day rule can start on any day. You are allowed to look both forwards and backwards from any date to find a 12-month window that works.

SARS has confirmed this in Interpretation Note 16. The wording of the law uses the phrase “any period of 12 months,” and the word “any” means exactly what it says. You can test multiple overlapping windows until you find one where both the 183-day total and the 60-continuous-day stretch are met.

The 60 Continuous Days Requirement

The 183-day total can be made up of separate trips. But the 60-day requirement cannot. You need at least one unbroken stretch of more than 60 full days outside South Africa within the same 12-month period.

An important detail from SARS. To “exceed” 60 full days does not mean you need 61 full days. You need to exceed 60 by any amount of time, even if that is just a few minutes or hours. So 60 days and 1 hour outside SA satisfies this test. In practice though, you should aim for at least 61 full days to avoid any disputes.

If you come back to South Africa in the middle of your foreign assignment, that breaks the continuous period. You then need to check whether you had another unbroken stretch of 60+ days within the same 12-month window. Coming home for Christmas is the classic trap. If your December trip breaks your only continuous stretch and you do not have another 60-day run in the same window, you fail the test.

Transit Through South Africa

There is one exception that can save you. If you are in transit through South Africa between two places outside the country, and you do not formally enter through a port of entry under the Immigration Act, you are deemed to be outside South Africa for the purposes of the SARS 183 day rule.

This means if you are flying from Lagos to Perth and have a connecting flight through OR Tambo, you remain “outside” South Africa for days-test purposes, as long as you stay in the transit area and do not go through passport control. The moment you formally enter the country, even for one night, the transit exception no longer applies and you are counted as being in SA.

Days Must Be Linked to Employment

This is a detail people miss. The days outside SA must be connected to your employment. SARS explicitly states that days spent outside the Republic when you are not in employment do not count towards the 183-day or 60-day tests.

If you are between contracts and spending a month traveling Europe before your next job starts, those days do not count. You were not employed and not rendering services. However, if you are continuously employed and your employer gives you annual leave while you are abroad, those leave days do count because you remain in employment throughout.

The same applies to rotational shift workers. If you work 28 days on, 28 days off on an offshore platform, your rest days count as days outside SA because you remain employed throughout the rotation. SARS has confirmed this in their interpretation notes. The rest periods are required by health and safety regulations and do not interrupt continuous employment.

The Physical Presence Test for Tax Residency (The Other 183-Day Rule)

This is the second “183-day” rule, and it works completely differently. It has nothing to do with the foreign income exemption. Instead, it determines whether a person who is not ordinarily resident in South Africa becomes a tax resident by spending too much time in the country.

The physical presence test applies mainly to foreign nationals who visit or work in South Africa frequently. It does not typically apply to South African citizens who are ordinarily resident, because they are already tax residents under the “ordinarily resident” test regardless of how many days they spend in SA. For a full breakdown, see our guide on the South African tax residency test.

Under the physical presence test, you become a SA tax resident if you are physically present in South Africa for more than 91 days in the current year of assessment, AND more than 91 days in each of the five preceding years, AND more than 915 days in total across those five preceding years.

Unlike the exemption test, the physical presence test counts part of a day as a full day. So if you land in SA at 11pm and leave the next morning at 6am, that counts as two days of physical presence (one partial day on arrival, one partial day on departure).

And unlike the exemption test, the physical presence test is locked to the year of assessment (1 March to 28/29 February), not a rolling 12-month window.

Why Expats Confuse the Two SARS 183 Day Rules

The confusion is understandable. Both rules involve 183 days. Both involve being in or out of South Africa. Both show up in conversations about “expat tax.” But they serve opposite purposes.

The exemption test asks whether you spent enough time outside SA to qualify for a tax break on your foreign salary. The residency test asks whether someone spent too much time inside SA and should be treated as a tax resident.

For most SA expats who moved abroad, the exemption test is the relevant one. You are already a tax resident (by being ordinarily resident), so the physical presence test for residency is not in play. What matters is whether you qualify for the R1.25 million exemption, and that depends on the 183-day and 60-continuous-day tests under Section 10(1)(o)(ii).

The residency physical presence test becomes relevant if you formally cease your tax residency and then start spending too much time in SA again. If you are a confirmed non-resident but you keep flying back and exceeding 91 days per year, you could accidentally become a tax resident again.

The SARS 183 Day Rule and Apportionment

Here is another area where people get confused. The days tests for qualifying for the exemption (183 and 60) are different from the days used to calculate how much income is exempt.

Once you qualify for the exemption, the exempt portion of your income is calculated using a work days formula, not a calendar days formula. SARS uses this calculation:

So the 183-day test uses all calendar days (including weekends and holidays). The apportionment formula uses only work days (excluding weekends and holidays). They are calculated differently on purpose, and mixing them up is a common source of errors. For the complete picture on how the exemption and apportionment work, read our guide to the R1.25 million foreign income exemption.

How to Keep a Days Record That SARS Will Accept

SARS can and does verify your travel history with the Department of Home Affairs. If your eFiling return claims 200 days outside SA but Home Affairs records show you entered and exited multiple times during that period, SARS will flag your return for verification.

The best practice is to keep a running spreadsheet that tracks every trip. Record the date you left SA, the date you returned, the destination, the purpose (work, leave, personal), and the number of full days outside the country. Keep copies of your passport stamps, flight bookings, and boarding passes as backup.

SARS has listed the supporting documents they expect to see if your return is selected for verification. These include a spreadsheet showing days in and out of SA, a copy of your passport showing entry and exit stamps, a letter from your employer confirming your overseas assignment and the periods covered, and your foreign employment contract.

Common SARS 183 Day Rule Mistakes

1. Counting travel days as full days outside SA

Your departure day from SA and your arrival day back in SA are not full days outside the country. You lose two days per round trip. If you take four trips home during the year, that is eight days gone.

2. Using the tax year instead of a rolling 12-month period

The exemption test does not use the tax year. It uses any 12-month period. If your assignment does not neatly align with 1 March to 28 February, you may find a qualifying window that spans two tax years.

3. Flying home for December holidays without checking the 60-day rule

Many SA expats fly home for 2 to 3 weeks in December. If that trip breaks your only continuous stretch of 60+ days, you may fail the second test. Before booking, count your days. Make sure you had at least one 60-day continuous stretch earlier in the year, or that you will have one after you return from your holiday.

4. Counting unemployed days as qualifying days

If you left your job, spent a month traveling, and then started a new job abroad, that gap month does not count towards the 183-day total. Only days during active employment qualify.

5. Confusing the exemption test with the residency test

Someone asks “do I pass the 183-day rule?” and the answer depends entirely on which rule they mean. The exemption test counts days outside SA over a rolling 12 months. The residency test counts days inside SA during the tax year, plus 91 days per year in the five preceding years, plus 915 total. If you are mixing these up, your entire tax position could be wrong.

What to Do Next

If you are working abroad as a South African tax resident, the SARS 183 day rule under Section 10(1)(o)(ii) is your key to the R1.25 million exemption. Start counting your days now. Build a spreadsheet. Keep your passport stamps and flight records.

If you are not sure whether you qualify, do not guess. The stakes are too high. Getting the days wrong means losing the exemption on your entire foreign salary, which could result in a tax bill of hundreds of thousands of rands plus penalties if SARS catches the error later.

For the full picture on how your expat tax obligations work, start with our complete guide to South African expat tax. And if you are ready to file, see our step-by-step guide to filing your expat tax return from abroad.