The government has promised not to raise the rates of income tax, National Insurance, or VAT. Next April, the full State Pension crosses a line in the tax code that the promise never mentioned - and for the pensioner whose only income is that pension, the first bill arrives by post, months after the tax year has ended.
There is a version of this story that gets told as a scandal about a stingy chancellor. It is worth setting that aside for a moment, because the mechanism is more interesting than the motive, and the mechanism is what will decide who pays.
A Tax Is Three Numbers
Most arguments about tax are arguments about one number. The rate.
That is understandable. The rate is the number politicians stand up and announce. It is the number in the headline. It is the number in the pledge.
But a tax is not a rate. A tax is a rate applied to a base of taxpayers, and the base is split in two by a threshold. Three numbers, not one. Change any of them and the bill changes.
Right now the loudest promise in British politics covers exactly one of the three. Labour’s 2024 manifesto pledge - repeated by the Prime Minister and the Chancellor - is that the main rates of income tax, National Insurance, and VAT will not rise this Parliament. Those three taxes bring in nearly 60 percent of everything the state collects. It is a useful assurance.
It is also completely silent on the place where the tax starts. And that line has not moved in five years.
The Line That Has Not Moved Since 2021
The personal allowance is the amount of income you can receive before income tax applies. It has been £12,570 since April 2021.
It is still £12,570 today, and it is legislated to stay there until April 2031. Getting it from 2021 to 2031 took two extensions: the freeze was due to end in 2026, was extended to 2028, and was extended again at the November 2025 Budget (the House of Commons Library explains the history).
The rest of the ladder is frozen with it. The basic-rate limit is £37,700. The higher-rate threshold is £50,270. The additional rate begins at £125,140, where it was lowered from £150,000 in April 2023. And between £100,000 and £125,140, the allowance is withdrawn by £1 for every £2 of income, which is how a 40 percent rate becomes an effective 60 percent rate on that stretch of earnings.
That gap between the rate on the label and the rate paid on the last pound earned is the subject of The 90% Tax Rate Myth, and it matters here too. A government can leave every headline rate untouched and still collect more from the same person, because the amount that sits above the line is what gets taxed.
This is the mechanism people call fiscal drag, and it is easier to see than it sounds. Wages rise in real terms and due to inflation. The line does not. So more of every pay packet sits above the line, and it is taxed at the same rates as before.
The Commons Library’s explainer on fiscal drag collects the OBR’s latest estimate: the freeze of income tax thresholds raises over £55 billion in 2030/31. The 2025 extension alone is forecast to raise £3.1 billion in 2028/29, rising to £11.6 billion in 2030/31. It also brings about 700,000 more people into income tax by 2030/31 - and that number only means anything against its baseline, which is what would have happened if the thresholds had gone on rising with inflation from 2028/29.
Nobody needs to stand up and announce any of that. Which is the point of it.
Two Lines, Moving in Opposite Directions
Now the other half of the pincer, which moves on a different rule entirely.
The State Pension rises under the triple lock: whichever is highest of September’s inflation figure, average earnings growth over May to July, or 2.5 percent.
This year the full new State Pension pays £241.30 a week, or £12,547.60 a year. That is £22.40 below the tax line.
Then, on 15 September, the Office for National Statistics reported that total earnings grew 3.9 percent over the three months to July. Inflation is running at 2.9 percent. The floor is 2.5 percent. Under the triple lock, the wage figure is the one that binds, which points to £250.70 a week from April 2027 - £13,036.40 a year, up £488.80.
All three inputs are now in. September’s inflation number came in at 3.5 percent on 21 October - below the 3.9 percent wage figure - so the wage leg binds and the direction is settled, not merely likely. From April, the standard pension crosses the standard allowance for the first time.
The Crossing, in Money Terms
Let us put the two numbers side by side, for a pensioner whose only income is the full new State Pension.
£13,036.40 of pension against a £12,570 allowance leaves £466.40 of taxable income. At the basic rate of 20 percent, that is a bill of about £93 for the year.
The size of the bill is not the story. The direction of travel is. The pension rises by roughly £488 a year. The allowance rises by nothing. So the gap between them - the part that is taxed - opens a little wider every April.
LCP, the actuarial consultants, have worked the sequence out: about £88 in 2027/28, £153 in 2028/29, £220 in 2029/30. Their table assumes a slightly smaller uprating than the 3.9 percent the wage data now points to, so treat those as the floor rather than the forecast. Small amounts. Compounding ones.
And it is worth knowing how the bill arrives. There is no tax return to fill in. HMRC already receives the pension figures from the Department for Work and Pensions, works out what is owed after the tax year closes, and posts a bill - a process called simple assessment. For someone whose only income has ever been the State Pension, that envelope is the first tax bill of their life, and it is for a tax they were told was not going up.
The Promise and the Missing Paragraph
The government knows this is coming. It said so in the last Budget.
The Red Book, at paragraph 4.167, promised to “ease the administrative burden” for pensioners whose sole income is the basic or new State Pension “without any increments”, so that they do not have to pay small amounts of tax through simple assessment from 2027-28. It added that the government was “exploring the best way to achieve this” and would “set out more detail next year”.
On 15 September the Pensions Minister, Torsten Bell, restated it: pensioners who only just exceed the allowance “will not pay small amounts of tax in this Parliament”, and the Chancellor “will set out further details on how that commitment will be delivered at the Budget”. The Budget was on 28 October. It is not the only pension change already legislated this Parliament - the squeeze on pension saving is the subject of The Pension Tax Raid: Your Pension Is Next.
Three things about that commitment are worth holding onto.
The first is who it covers. “Without any increments” is doing a great deal of work in that sentence. It leaves out anyone with an additional state pension or protected payments on top of the flat rate. And it is written for pensioners whose sole income is the pension, which excludes anyone with a small works pension, a savings account earning interest, or a second pension from a lifetime of employment. LCP estimates that about 820,000 of the roughly 5.8 million people on the new State Pension will actually be in scope when the pledge starts - fewer than one in five of them, and about one in 16 pensioners overall.
The second is that the mechanism does not exist yet. “Exploring the best way” is not a mechanism. The wording first appeared in the November 2025 Budget, was restated by a minister ten months later, and the detail is now due at the Budget on 28 October. Steve Webb, a former pensions minister and now a partner at LCP, called the government’s plans “a mess”.
The third thing explains the first two.
Why the Narrow Version
Suppose you wanted the pension never to cross the line at all. The obvious way is to raise the allowance so that it stays ahead - which is roughly what the Conservative manifesto proposed in 2024.
The same analysis puts that version at £750 million in 2027/28, rising to about £1.5 billion in 2028/29 and £2.3 billion in 2029/30. And the reason it is that expensive is the same reason the government’s concession is cheap: 8.7 million pensioners already pay income tax, and an allowance rise goes to all of them, while the concession goes only to the ones with nothing else. The narrow fix costs a fraction of the broad one because it reaches about one pensioner in 16.
That is not a criticism of the pensioners who qualify. It is the arithmetic of targeting, and it is worth seeing clearly, because it explains the shape of the promise: the government has committed to solving the headline, not the problem.
If you want the general repair - unfreezing the allowance so the line moves again - the Institute for Fiscal Studies has costed the options: £8.4 billion a year for resuming inflation uprating from April 2027, or about £2.1 billion for uprating once in April 2027 and then freezing again at £12,840, or £6.7 billion if the higher-rate threshold is held where it is while the allowance moves.
For scale: cutting the basic rate from 20 percent to 19 percent costs £7.4 billion a year. Cutting the higher rate from 40 percent to 35 percent costs £9.5 billion. Freezing the allowance raises more than either of those, every year, without a vote on a rate.
And none of those figures tells you who ends up carrying the cost, which is the question that decides whether a tax does what its supporters intended. That is the ground covered in Taxes - Who Actually Pays.
The Reform Just Announced Does Not Change April
At the end of September the Prime Minister announced a reform of the triple lock, to take effect from 2030-31. The floor stays: the pension will still rise by at least inflation, or 2.5 percent, whichever is higher. What goes is the ratchet - the rule that takes the highest of the three measures every single year and never gives any of it back. In the long run, the pension will track average earnings instead.
Jonathan Cribb of the IFS called it “a big improvement” that “neutered the worst element of the triple lock”, while noting that better reforms were available. His scale check is worth quoting: the unreformed triple lock costs about £16 billion a year more than an earnings-linked pension would have, and the new policy, had it been in place since 2011, would have spent £9 billion less this year alone.
Two things about it matter.
It does not change April 2027. The crossing happens under the old formula, and the reform does not start for three years. The pensioner whose state pension alone tips over the line next spring is dealing with the rules as they stand, not as they will be in 2030.
And it does not change the line. The pension will rise next April by the wage figure. The boundary it crosses will still be £12,570. What the reform changes is the pace of the pension after 2030 - slower, more predictable, no longer permanently outrunning wages. The allowance is frozen to 2031 regardless, and then the legislated default is to index it again. That default is the same one that was overridden in 2021, in 2022, and again in 2025.
The Question to Carry
When someone tells you that a tax did not go up, ask which part they mean: the rate, the base, or the threshold. Only one of the three requires them to stand up and say it.
And when you hear an end date on a freeze, read the record on it. This one was due to end in 2026, then 2028, then 2031, and it has already been renewed twice without anyone raising a rate. A promise about rates is not a promise about your bill.
The bill that follows this one will not be announced at all. It will arrive by post, months after the year it covers, because the line moved and nobody had to say so.
Next time a Budget promises that income tax is not going up, look at the line instead of the rate - and ask who last set the line, and when they plan to move it. That arithmetic is why the Budget on 28 October is being argued over at all: The 63 Billion Reckoning.
The Budget was on 28 October, and the OBR’s forecast was published the same day.