"most". Estimates vary. 3-7% according to the IFS based on what they acknowledge to be "old, thin, sparse" data...it's actually worse than "old, thin, sparse" and of dubious relevance; their analysis is stacked with errors and dubious assumptions. Most other estimates pointing at 15-25%. A survey last week by Baines Cutler said 40%, but that has its flaws too.
So nobody knows. In fact, this isn't "knowable". You / we / the IFS are speculating on the behaviour of a segment of people that proponents of the tax resolutely refuse to speak to or engage with.
Labour's VAT policy is out-of-touch (substack.com)
“I haven’t visited any private schools officially in my role, no,” Ms Phillipson said.
What does the "coverage ratio" look like? Well, based on £3040 vs 8000, even the 40% migration rate is breakeven. But that's not right because
- £8k is variable cost. If they need new classrooms, we could assume we should include fixed costs, thus £11k.
- ...and when did the public sector ever do a change programme without raising overheads?
- also independent schools contribute more tax and employ more people, so contraction of the sector / migration costs a further £3k in tax
- state schools have a VAT tax break when they reclaim supplies, worth a further £400 per pupil
- if even a quarter of parents, relieved of school fees, choose more leisure instead of spending those fees on fast cars and restaurants, it costs £4k per child migrating.
- ...and those parents working less also hurts downstream economics; their customers, employers and employees; the contraction of the taxable economy could be estimated at a further £4-8k per child.
So at that rate it's more like 10% of children migrating raises zero money; even at 5% migration it raises around half the sum expected.
If you want to justify this policy based on revenue-raising, you have to think as an economist. And then you'll see it's a poor proposition. And then, if you REALLY care about improving state schools, as I personally do, you'll say "surely there's a better, less risky, less harmful, less divisive way to raise some money?"
And you'll realise that "taxing education" is less attractive than "taxing higher earners" more broadly, so that the responsibility of fixing state schools falls on those actually using them, rather than being targeted only at those that don't.
If you don't want to justify this policy based on revenue, then don't be surprised about the "envy and pitchforks" jibes, because that's all there is left.