On April 6 the budget small print kicks in. Shares on the alternative investment market (Aim) lose their full inheritance tax relief. Dividend tax rates will rise. Agricultural property relief will be capped at £2.5 million. The state pension age begins its climb to 67.

No government department has modelled what happens when all land in the same household at the same time. Parliament debated each one individually. The Treasury costed each one individually. The cumulative effect on the people who will actually pay the bill has never been assessed by anyone in government — here what it could mean.

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The farmers

Take a couple in their late fifties who farm 400 acres in Lincolnshire. The land has been in the family for three generations. The farm is valued at £3 million on paper; the family never sees that number in a bank, of course, and probably never will. They’re up before dawn most mornings. They work seven days a week through lambing, harvest and everything between. They produce food that feeds this country. They’re not rich — they are asset-rich and cash-poor.

On April 5 their estate plan works. Agricultural property relief covers the full value. They hold Aim shares as part of their inheritance tax strategy, and business property relief covers those too. They draw dividend income from the farm’s trading company. Three of the assumptions underpinning 20 years of planning are about to break on the same morning: the farm relief is capped at £2.5 million, the Aim relief is halved from 100 to 50 per cent and their dividends cost more.

Most reading this will look at that household and think, that’s not me. But the mechanism that catches the farm owner is working its way through to every household with a pension, a portfolio or a small business. The distance between “that will not affect me” and “how did I end up paying this?” is shorter than most people think.

The self-employed consultant

A woman in her early sixties is running a small consultancy through a limited company. She draws most of her income as dividends. Three years ago, the first £2,000 of dividend income was tax-free. Now it’s £500, and the rate just went up again. She built the company over 15 years, took the risk of self-employment, hired staff, paid corporation tax and structured her income exactly as the system encouraged her to. On April 6 that structure costs her more. She changed nothing. The allowances she planned around were reduced, yet again, without a vote.

She’s not a tax avoider. She’s a small business owner who did what her accountant told her to do at a time when the rules were different. The dividend allowance has been cut by 75 per cent in three years. Nobody announced it as a tax rise on small business owners. It didn’t need announcing. The same result was achieved by simply moving the threshold.

The pensioners

A retired couple in their late sixties are living on a modest private pension and a portfolio that generates £15,000 a year in dividend income. Their state pension rises every April under the triple lock, guaranteed by law to increase. No chancellor dares touch it. The state pension is now within touching distance of the personal allowance and it will soon push pensioners into paying tax on it.

The personal allowance has not moved since 2021. It will not move until 2031. The state pension rises by law. The threshold that determines when you start paying tax on it stays frozen by political choice. The couple aren’t richer. They’re in the same house on the same pension. The government held the line, abandoned them and let inflation suffocate their lifestyle.

And this is the pattern running beneath all of it. The state pension is guaranteed to grow. The personal allowance, the dividend allowance, the inheritance tax nil-rate band? Frozen. Unfreezing them costs the Treasury money already counted. So the person who saved nothing sees their income rise every April. The person who saved diligently for 40 years watches every relief and allowance erode around them. Both did what was asked of them. The system treats them very differently.

The unwitting Aim investor

The changes to the Aim were designed to hit one group: wealthy people using business property relief to shelter assets from inheritance tax. The political framing was deliberate, but tax policy doesn’t work in isolation and the second-order consequences of the business property relief change reach far beyond the people it was aimed at. Whether that reflects design or negligence is a question worth asking.

There is about £6 billion in dedicated Aim inheritance tax portfolios, managed by firms whose entire proposition depended on full relief. With that relief halved, expected outflows will exceed £600 million a year as advisers move clients into other strategies. That selling pressure hits a market of just 610 companies with a combined capitalisation of about £68 billion, a market that has already suffered 41 consecutive months of net fund outflows and lost a quarter of its listed companies since 2020.

Now think about the person who has never bought an Aim share. Mainstream UK small-cap funds, the kind that sit inside workplace pensions, Sipps and Isas have substantial Aim exposure. Some hold more than half their assets in Aim-listed companies. A person whose workplace pension includes a smaller companies allocation, and many do, holds Aim exposure without ever having chosen it.

When £600 million a year of forced selling hits a market already short of liquidity, things happen and they are not good. If 60 per cent of the houses in a prosperous suburb were put on the market at once, the value of every property would fall. That is what the business property relief change does to the Aim, and every fund, pension and Isa-holding Aim share absorbs the impact.

The contradiction deepens. Under the Mansion House Accord, signed in 2025, 17 of Britain’s largest workplace pension providers committed to directing more capital into UK growth assets, including the Aim. The government championed the initiative. One arm of policy is channelling pension money into a market that another arm of policy is draining.

The farmers, the consultancy owner, the retired couple, the pension saver who never knew they held Aim shares. Each was told the system rewarded saving, planning and self-reliance. Each followed the guidance. And each will discover on April 6 that the rules have shifted, through the accumulation of threshold freezes, allowance cuts and relief reductions that were never presented as a package — presenting them as a package would have made the pattern impossible to ignore.

Jessica Cook is a partner in a financial planning firm