There are few current issues more emotive than that of immigration, so I wanted to take a dispassionate view of the future demographic and economic implications of where we are now, and what might happen in the future, particularly if Nigel Farage achieved his aim of ‘net zero’ one-in, one-out migration as he stated in June this year.
I took as a starting point the population projections published by the Office of National Statistics.
The central assumption is that the UK’s population will grow from around 69 million today to 77 million in 2047. One key point to note in this projection is the forecast that deaths will exceed births every year from the end of this decade, and so growth is primarily driven by net inward migration at an average of 340,000 per year, with the people coming to the UK at a rate approximately double that of those leaving.
Using this data we can consider alternative scenarios. In the unlikely event that we went for absolute zero immigration while still allowing British citizens to leave and taking into account below-replacement birth rates, the population would fall dramatically to around 61 million in 2047 with a collapse in the number of those of working age.
However if we look at the ‘net zero’ position advocated by Farage, then the population would fall slightly from its current 69 million to 67.5 million by 2047. At first glance this might appear an insignificant change, but in reality the effects are dramatic.
The reason for the significance is demographics. Other data from the ONS shows that 94% of immigrants coming to the UK are of working age, as are 93% of those emigrating from the UK. However, the UK’s existing population is ageing, and we currently have a ratio of working age people to non-working age (children and pensioners) of about 1.8.
In Farage’s ‘net zero’ scenario, we end up with a falling ratio of working to non-working age to around 1.5, and a working age population in 2047 roughly 2.5 million lower than it is today, most of whom will have become pensioners. This has huge implications for both taxation and spending, because getting old is expensive.