1%growth in UK GDP per head from 2019 to 2025, while net migration added 2.8 million people over those 6 years. The economy got bigger. The people in it barely got richer.

Sources: ONS, GDP per head (2026); ONS, net migration (2026)

Harrison Spanner · 1 Nov 2026 · 7 min read

Big Ben and the Houses of Parliament seen across the River Thames in London — The Houses of Parliament, London. Photo: Andrew McMillan, Public domain, via Wikimedia Commons

You’ve heard the pitch: let more people in and the economy grows. More workers make more, so GDP rises. But you don’t live on GDP. You live on your share of it, and that depends on how much each hour of work produces. Britain just ran the biggest test of it in its history. A bigger economy is not a richer one. GDP per head is a far better guide to your living standards.

944,000net migration to the UK in the year to March 2023, a record

0.1%gain in GDP per head by 2028–29 from 200,000 more migrants a year in the OBR’s main case, against 1.5% for GDP

0.4%a year: UK output per hour growth since 2007, down from 2.1% in the decade before

How it works

More GDP, not more per head

Total GDP rises at step 2. Your share is decided at step 4.

Based on the Migration Advisory Committee and the Office for Budget Responsibility

This isn’t a fringe theory. The Migration Advisory Committee, which advises the government, set out the textbook logic in 2025: when the population grows, the same capital is shared by more people, and “with less capital per person, we will be less productive, so output per person will fall”. It adds this isn’t certain, since migrants may bring capital or skills, but is worth keeping in mind. The OBR puts the cost of keeping public capital per person steady at up to £20,000 of extra public investment for each extra person, which it calls likely an overestimate.

What Britain’s own numbers show

UK net migration, by year

Before 2021, no 12-month period topped 321,000. Then it nearly tripled.

Record for any 12 months: 944,000, in the year to March 2023. ONS’s current method starts in 2012.

Source: ONS, long-term international migration, provisional (May 2026)

It was bigger than first reported. ONS first put 2022 at 606,000. It now says 891,000.
The economy grew. The average share barely moved. From 2019 to 2025, UK GDP grew 5.4% after inflation. GDP per head grew 1.0%. Net migration over those 6 years, 2020 to 2025, added 2.8 million people, most of it from 2021 to 2023.
Per head went backwards 6 quarters in a row. From mid-2022 to the end of 2023, the height of the inflow, real GDP per head fell every quarter, 1.6% in all. Total GDP edged up 0.2% over the same stretch. That was also the energy shock and steep rate rises, so migration wasn’t the only drag.
Most of the work-visa surge came through the lowest-paid route. Students and the Ukraine and Hong Kong schemes added to it. But of the 342,000 rise in work visas from 2021 to 2023, 285,000 came through Health and Care. In the year to September 2024 the route averaged more than 2 dependants per main applicant. The MAC says care workers are less well paid, so their direct fiscal impact is smaller “and possibly negative in some cases”.

The Home Office headquarters at 2 Marsham Street, London: a white patterned facade under a canopy of coloured glass panels — The Home Office, which runs Britain’s visa system, London. Photo: Steph Gray, CC BY-SA 2.0, via Wikimedia Commons

A bigger economy is not a richer one. Always ask: per head?

Even the official forecasts say per head barely moves

The Treasury’s own forecaster, the OBR, modelled it. In its March 2024 main scenario, 200,000 more migrants a year raised GDP by 1.5% by 2028–29. GDP per head, which the MAC calls “a better measure of welfare”, rose just 0.1%. If investment lags, GDP rose 1% and GDP per head fell 0.4%. Only when nearly all arrivals came on work visas and worked did GDP per head rise 0.8%. The OBR calls the per-person effect “highly uncertain”.

Total GDP vs GDP per head, UK

After inflation, 2007 = 100

The economy is 24% bigger than in 2007. Output per person is 9% bigger.

Source: ONS, GDP and GDP per head, chained volume measures (September 2026)

Migration can pay. In the OBR’s model, an average-wage migrant is a net contributor from year two, and one earning 30% above average stays a net gain to the public finances even if they live to 100. The MAC’s 2018 review found most studies show a positive effect on productivity, larger for high-skilled migrants, though with “a lot of uncertainty”. But the OBR’s low-wage migrant, the bottom quarter of arrivals on about 1/2 the average wage, pays 22% of the tax of an average resident. Who comes matters more than how many.

UK output per hour, growth a year

The migration wave didn’t bring back pre-2008 growth.

1997–20072.1%

2007–20190.3%

2019–20250.4%

Output per hour was about 1% lower in 2025 than in 2022.

Source: ONS, output per hour worked, whole economy (August 2026)

Migration didn’t cause the stall that began in 2008. It just didn’t fix it.

Travellers walking towards the passport control hall under a UK Border sign at Heathrow Airport, seen from an upper walkway — Passport control at Heathrow Airport, 2018. Photo: Eric Fischer, CC BY 2.0, via Wikimedia Commons

Australia is running the same play

We lean on population growth too. Net overseas migration hit a record 556,000 in the year to September 2023. Around the same time, real GDP per capita fell for seven quarters in a row, from early 2023 until a 0.1% rise in the December quarter of 2024.

Australia, growth in the year to June 2026

About 2/3 of the growth was more people.

Total GDP2.1%

GDP per capita0.7%

Source: ABS, Australian National Accounts, June quarter 2026

The windowless stone walls of the Bank of England on Threadneedle Street in the City of London, with a red bus passing — The Bank of England on Threadneedle Street. Photo: Colin Smith, CC BY-SA 2.0, via Wikimedia Commons

The fix: judge growth per head, and protect your own

You can’t set migration policy. You can refuse to be sold a GDP headline, and stop your savings depending on a stalled economy. When output per person stalls, so does tax per person, and indebted governments have few easy options: tax more, cut services, or let inflation shrink the debt, and your cash.

What each fix does

One keeps score. One protects. One explains.

Sources: ABS; this site’s tracker

For the scoreboard

GDP per capita, from the ABS

Every quarter the ABS publishes GDP per capita right next to total GDP. It’s the better guide to your living standards. When a politician says the economy is growing, check that line first.

See the latest figures →

For your savings

Gold & silver tracker

Gold and silver aren’t issued by any government, so no treasury can print more of them. This site’s free tracker shows live prices in A$ and emails you when a price you choose is reached. Gold pays no interest and can fall for years, so treat it as insurance for part of your savings, not a plan for all of them.

See live prices →

For understanding it

Exodus

Paul Collier, an Oxford economist, argues the real question isn’t whether migration is good or bad, but how much and how fast, and that the biggest gains go to the migrants themselves rather than to the people already there.

Find it on Amazon (affiliate link) →

Do this today

1. Look up GDP per capita, not GDP, next time growth is announced.
2. Check the gold and silver price in A$ and set an alert at a price you’d buy at.
3. Read Exodus before the next “migration grows the economy” debate.

For why the money in your account buys less every year, read how your dollar lost 1/2 its buying power since 2000.

Go deeper

The Price of Time by Edward Chancellor. How near-zero rates after 2008 inflated debt and kept weak firms alive.
When Money Dies by Adam Fergusson. What happened to savers when Weimar Germany inflated its debts away.

What to make of it

A bigger economy is not the same as a richer you. Britain added 2.8 million people through net migration in six years. GDP per head rose 1%, the kind of result the official modelling warned volume alone would deliver. Next time someone sells you growth, ask one question: per head? Then protect your own savings either way.

Sources

Amazon links are affiliate links. As an Amazon Associate I earn from qualifying purchases.

This article is general information and analysis, not financial advice. Follow the sources to form your own view.