UK vs SA Tax [Free Calculator 2026] - What YOU Keep

The honest answer to "where do you keep more of your salary" is that on ordinary pay it barely matters — and at the top it matters a lot, in South Africa's favour.

Here is what the two systems actually keep, computed with UK rates for 2026/27 from gov.uk and South African PAYE:

Try your own figures on the UK vs SA tax calculator.

Rateweb analysis, 2026

We built both tax systems from their own authorities, UK rates from gov.uk for 2026/27 and South African PAYE from SARS brackets, then compared the proportion kept rather than converting salaries. Three findings:

Finding	Evidence
The two systems are near-identical on mid-range pay	R45,000 keeps 79.0%; GBP 4,000 keeps 79.3%, a 0.3 point gap
South Africa keeps more of a high salary	At the top of our table, 65.6% against 61.2%
The UK has a 60% marginal band between GBP 100,000 and 125,140	An extra GBP 1,000 costs GBP 600: taxed at 40%, and it strips GBP 500 of allowance also taxed at 40%

The 60% band exists because the personal allowance withdraws at GBP 1 for every GBP 2 earned above GBP 100,000. Above GBP 125,140 there is no allowance left to withdraw and the marginal rate falls back to 45%, so a slice of income is taxed harder than income above it. South Africa's rebates do not taper, so it has no equivalent.

Method: engine output at each income level, verified against gov.uk's own published National Insurance worked example. Analysis by Rateweb.

Why there is no exchange rate here

You will notice the two columns are not converted into each other. That is deliberate.

Converting salaries would require a live exchange rate, which means the answer changes every day for reasons that have nothing to do with tax. Worse, it quietly turns a question about tax into a question about purchasing power, and those are different questions with different answers.

So the comparison is on proportions. What share of your gross does each system leave you? That is a fair comparison whatever the rand is doing this week. The rand and pound amounts are shown in their own currencies and are not comparable with each other — only the percentages are.

The two systems are closer than people assume

At R45,000 and £4,000 a month, the difference is three-tenths of one percentage point. Two tax systems designed independently, on different continents, land within a rounding error of each other for a middle-income professional.

That is worth knowing because the assumption usually runs the other way — that one country is obviously more punishing. On ordinary salaries, they are not.

Where they diverge, and why

The gap opens at the top, and it opens in a direction that surprises people: South Africa keeps more of a high salary than the UK does.

At the top of the table South Africa leaves 65.6% and the UK 61.2%. South Africa's top rate is 45% and the UK's is also 45% — so the difference is not the headline rate. It is what happens on the way there.

The 60% band nobody mentions

Between £100,000 and £125,140 of annual income, the UK's effective marginal rate is not 40% and not 45%. It is 60%.

The mechanism is the personal allowance taper. Above £100,000 you lose £1 of your £12,570 allowance for every £2 you earn. So an extra £1,000 of salary is taxed at 40% — and it also strips £500 of allowance, which is then taxed at 40% as well. £400 plus £200 is £600 out of £1,000.

Above £125,140 the allowance is gone, there is nothing left to withdraw, and the marginal rate drops back to 45%. Which produces the genuinely strange result that a slice of income between £100k and £125k is taxed harder than income above it.

South Africa has no equivalent. Its rebates do not taper, so its marginal rate rises to 45% and stops.

If you are deciding between offers, or negotiating, that band is the single most useful thing on this page: within it, a pay rise is worth 40p in the pound, and a pension contribution that brings you back under £100,000 is worth far more than its face value.

The comparison most people get wrong before they start

If you are holding two offers, there is an error that happens before any tax arithmetic and swamps everything on this page.

South African offers are conventionally quoted as cost to company. UK offers are conventionally quoted as gross salary. Those are not the same quantity.

A cost-to-company figure is the total the employer spends on you, and depending on the package it can include the employer's retirement contribution, medical aid contribution, and other benefits — money that never appears as gross pay and therefore never appears in a take-home calculation. A UK gross salary is simply the number your income tax and National Insurance are calculated on; the employer's own National Insurance sits on top of it and is never quoted to you at all.

So somebody comparing "R1.2m cost to company" with "£60,000 salary" is comparing a total employment cost against a gross wage. The South African number looks larger than the thing it is being measured against, because it contains items the other number excludes by convention.

Before comparing anything, get both offers onto the same footing. Ask the South African employer what the gross salary component of the package is, after the employer's contributions are stripped out. That figure is the one to put into a take-home calculation, and the one that is comparable to a UK salary.

Then compare what actually lands in your account each month, in each country's own currency, against what a month costs you there. Not gross against gross, and certainly not cost to company against gross.

Which system applies to you is a separate question

This page compares two systems. It does not tell you which one you are in, and that question has a genuinely complicated answer that people routinely assume is obvious.

Tax residence is not simply where your employer is, or where you are currently sitting. Both countries have their own statutory tests for residence, both look at more than one factor, and it is possible to meet the tests for both in the same year — particularly in a year when you move. There is a double tax agreement between the United Kingdom and South Africa that exists precisely because that overlap happens.

We are not going to set out those tests here. They involve day counts, ties and tie-breaker rules that are wrong in a paragraph, and a wrong answer costs far more than a wrong percentage would. Check your position with HMRC and SARS, and if you are moving mid-year, with somebody who does this professionally — once, at the start, rather than after a filing season has gone wrong.

One practical detail that catches people out: the two tax years do not line up. South Africa's runs March to February; the UK's runs April to April. Move mid-year and you have a part-year in each, on different calendars, which is usually the point at which a straightforward situation stops being one.

What these figures include

UK: income tax and Class 1 employee National Insurance, at 2026/27 rates. South Africa: PAYE and UIF.

What they leave out, because each depends on circumstances a calculator cannot know:

• UK student loan repayments, which can add 9% above the relevant threshold.
• Pension contributions and salary sacrifice on either side — both change the answer substantially, and in the £100k–£125k band dramatically.
• Scottish rates, which genuinely differ from the rest of the UK. If you are a Scottish taxpayer these figures are not yours.
• South African medical aid tax credits and retirement annuity contributions.

So treat this as a comparison of the two systems' shape, not as a payslip prediction.

The thing this cannot tell you

Keeping 79% of your pay means nothing on its own — it depends entirely on what that pay buys where you live. A tax comparison is not a cost-of-living comparison, and anyone who converts the two columns with today's rate and declares a winner has answered a different question from the one they asked.

What this page can tell you is how each system treats an extra pound or rand you earn. That is the part you can actually plan around.

How does this affect YOUR Money OS?

If you are inside the UK's 60% band, a pension contribution that brings you back under GBP 100,000 is worth roughly double its face value. One of the few moves that changes your position materially in a single decision.

Check my free OS score

FAQ

Do you pay more tax in the UK or South Africa? On mid-range pay they are within a rounding error. R45,000 a month keeps 79.0% and GBP 4,000 keeps 79.3%. On high pay South Africa keeps more, largely because of the UK's allowance taper.

What is the UK 60% tax band? Between GBP 100,000 and 125,140 of annual income the personal allowance is withdrawn at GBP 1 for every GBP 2 earned, giving an effective 60% marginal rate.

Is South Africa's top tax rate higher than the UK's? Both top out at 45%. The difference is not the headline rate but what happens on the way to it.

Can I compare UK and SA salaries using an exchange rate? You can, but it answers a different question. Converting mixes tax with purchasing power and changes daily.

Does this include National Insurance and UIF? Yes. It excludes student loans, pension contributions and Scottish rates.

How do I compare a South African offer with a UK one? Get them onto the same footing first. South African offers are usually quoted as cost to company, which includes employer contributions; UK offers are quoted as gross salary, which does not. Ask for the gross salary component of the SA package before comparing anything.

Which country's tax do I actually pay if I move? Tax residence decides it, and it is not simply where your employer is. Both countries have their own residence tests, you can meet both in a year you move, and a double tax agreement exists for that reason. Check with HMRC and SARS rather than assuming.

Do the UK and South African tax years line up? No. South Africa's runs March to February and the UK's runs April to April, so a mid-year move leaves you with a part-year in each on different calendars.

Does this page tell me where I would be better off? No. It compares what each system takes, which is a different question from what your pay buys where you live. A tax comparison is not a cost-of-living comparison.

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