By John Macaulay | 28 October 2026, 12:53 GMT (London)
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The British government is proposing to reduce the time limit for reclaiming overpaid National Insurance contributions from six years to four. At the same time, HM Revenue and Customs (HMRC) intends to extend the period for uncovering deliberate underpayments to twenty years.
In other words, when a citizen overpays the state, the deadline for making a claim is cut by a third. Yet, when the state is deliberately short-changed, the window for identifying the debt can stretch to twenty years — five times longer than the time allowed for a refund.
But the most interesting part begins where the debate over time limits ends.
In the 2024–2025 financial year, National Insurance receipts in the UK public accounts totalled £149.9 billion. Meanwhile, HMRC estimated the overall tax gap across the entire system at £59.2 billion, of which £20.9 billion was attributed jointly to Income Tax, National Insurance, and Capital Gains Tax.
The state, it seems, is perfectly capable of calculating exactly how much it is owed, down to the nearest hundred million pounds.
But how much does the state itself owe to its citizens due to erroneously deducted contributions? How many overpayments have become irrecoverable simply because the clock ran out? We found no comparable published figure.
Now, let us turn to the movement of the money itself. According to the official accounts of the National Insurance Fund Investment Account, as of 31 March 2026, the fund’s investment account held assets of £89.267 billion. These funds generated interest: £4.068 billion in 2024–2025, and £3.284 billion in 2025–2026. That is a staggering £7.352 billion in official interest income alone over just two years.
Investments are managed by the state-run Commissioners for the Reduction of the National Debt via the UK Debt Management Office (DMO). Funds are placed in the Debt Management Account, with interest credited directly to the fund. All fund assets are either held in accounts at the Bank of England or invested directly in government bonds and Treasury bills through the Debt Management Account.
So, what is the real sleight of hand here? In the commercial world, managing an £89 billion portfolio would easily cost hundreds of millions in fees. Yet here, the operational costs of running the fund are less than £100,000 a year. The secret is simple: this money never actually touches the open market.
The fund "invests" by purchasing government bonds directly from the state itself. The Treasury takes the hard cash for its day-to-day spending, leaving internal IOUs in its wake. Meanwhile, the DMO churns through up to £5 trillion a year on the money market, creating a colossal financial merry-go-round of short-term loans. The outside world sees these multi-trillion-pound turnovers and trusts in the system's absolute liquidity, allowing the state to quietly utilise the internal savings of its citizens without ever having to pay them out in actual cash.
But the real kicker is that commercial banks are doing something very similar, only with their own money. They buy up the very same £303 billion in external bonds that the DMO issues to cover the deficit, and then use them as prime collateral to secure fresh loans from the Central Bank.
Naturally, these billions cannot simply be written off as profit from erroneously deducted contributions. This is the yield from the fund's total invested assets. Yet it is precisely here, behind the smokescreen of these trillion-pound state merry-go-rounds, that the ultimate question arises:
Where exactly was the money overpaid by the workers? When did it arrive? Who used it to prop up this colossal liquidity? And what kind of return did it generate during the time it was held?
Imagine a worker from whom a thousand pounds was mistakenly deducted. Five years later, he discovers the overpayment. Under the proposed four-year rule, the standard deadline for claiming a refund has already passed.
Yet another question arises: for those five years, his thousand pounds was entirely out of his hands. Who enjoyed the economic benefits of this situation? How much interest did that £1,000 generate, and for whom? Who ultimately pocketed the principal along with the profit? And if the fund is capable of earning billions in interest, why does the reform debate completely lack a separate, public accounting of the income potentially tied to unreturned overpayments? Why shouldn't the public demand the publication of all these unheard-of profits and the total sums of overpayments combined? We need public oversight. Where is it? It simply does not exist! There are only measures and reforms, declarations and grandiose statements from ministers and ministries that even horses are laughing at by now, and it does not matter whether the left promises reforms or the right swears a blood oath to impose police order: the essence is the same! Publish the profits of the gentlemen bankers and their funds!
To obtain this disclosure, it is enough to keep these bankers for a few weeks in conditions that are perfectly respectable even by their own standards, with the simple aim of compelling them to expose the threads, the deceitful tricks, the filth and the self-interest that, under the new government, cost Britain hundreds of billions. There is no popular oversight — that is the fundamental cause of anarchy and ruin in England.
On the quarterdeck of our ship, captains come and go. Some swear they will distribute the rations equally; others promise to tighten discipline and scrub the decks until they gleam. But while the crew listens to these fine speeches, down in the purser's hold—where no one is allowed—chests of gold are being quietly and methodically shifted around.
Perhaps it is time to politely, but firmly, ask for the keys to that hold? And, after confining our most respected merchants to their luxurious cabins for a fortnight, simply ask them to explain exactly how they keep their ledgers? After all, without an honest reckoning in the hold, any ship will eventually run aground on the rocks, no matter how often the captains change on the bridge.
Finally, HMRC estimates its annual expenditure on specific legal actions to preserve the ability to recover old debts at approximately £4 million. The reform is intended, among other things, to eliminate the need for such procedures. When we are talking about £4 million that HMRC spends on lawsuits solely to prevent old debts from becoming statute-barred, we are looking at a classic case of cost-shifting.
Who is footing the bill? The answer is simple. First, the taxpayers: initially, this £4 million a year comes out of HMRC’s general budget, meaning it is paid for out of the pockets of ordinary citizens. Second, the debtors themselves: if HMRC takes a case to court and wins (or secures a County Court Judgment — CCJ), all legal costs, court fees, and penalties are simply piled on top of the individual's debt. The state essentially tries to claw back money that has already been paid for.
And who gets the fees? External solicitors: HMRC frequently outsources routine litigation to private law firms. But that is not all. Beyond the lawyers, the reform is designed to entrench procedures like debt collection. Today, this £4 million a year goes towards court fees and external legal firms (such as BW Legal or Drydensfairfax). Tomorrow, debts to the state will automatically become "eternal."
This is not merely "saving on lawyers"—it is the removal of any time limits on the pressure applied to the working class. Where a debtor once knew that a debt would eventually be written off after the limitation period expired, private debt collection agencies (working on contract for HMRC) will now hold perpetual leverage. They will no longer need to prove anything in court. They can simply pass the case back and forth for years, racking up administrative fees and psychologically exhausting the individual, knowing that time is no longer working against them. The reform will simply abolish the statute of limitations for all manner of state debts, while officials continue to churn trillions of pounds, writing whatever they please on paper, hiding behind eloquent speeches about "patriotism," and raking in hundreds of billions on banking and financial operations.
A highly revealing picture thus emerges. The state keeps detailed accounts of the money owed to it, the costs of recovering those debts, and the interest earned by the investment fund. Yet the public is presented with no equally clear account of the overpayments that have never been refunded. And heaven forbid anyone should raise this question publicly! The moment you do, you risk being branded a criminal or an agent of Russian intelligence.
The question must therefore be put plainly: how much money has the state collected in excess of what was lawfully due, where has that money been held, who has controlled it, and how much interest has been earned while it was in their hands?
Until these questions are answered, shortening the time limits for claiming refunds cannot simply be presented as an administrative simplification. This is not about the £1,000 overpaid by one individual worker. It is about the movement of funds belonging to millions of contributors, the distribution of financial returns, and the economic consequences of restricting their rights. And before shortening the period during which citizens may reclaim their own money, the state ought to produce a full account of how much it still owes them, including any interest accrued on that capital.
P.S.
If we break down National Insurance contributions by category of contributor — employees, employers and the self-employed — we encounter precisely the same uncertainty as when examining overpayments and the fund’s assets. The state publishes figures showing billions of pounds in contributions received. Yet the available accounts do not establish how much has been refunded to each category, how much remains unrefunded because the statutory time limit has expired, or who has ultimately derived the economic benefit from those funds. At present, one can only speculate. Thus, while the sums collected by the state are known, a complete account of what has happened to overpaid contributions, and how those funds are distributed between the different categories of contributors, remains undisclosed.
