The 2025 Budget explained: how you’re really affected

If Budget season were a drinking game, "challenging economic backdrop", "£30bn black hole" and "necessary choices" would all be on the sad, sorry list – and you’d be horizontal by now.

Gloomy hints from the Chancellor made it clear the Autumn budget was never going to be a crowd-pleaser.

In the end, Reeves’ new measures are expected to raise £26 billion by 2029-30 through a combination of personal tax rises and a raft of smaller revenue-raising measures.

Which is puzzling to most people, because last year’s budget was the biggest tax-raising fiscal event since 1993, hauling in roughly £40bn. And after it, Reeves promised there’d be no coming back to the well.

So the obvious place to start is: what went wrong?

When the OBR (the independent watchdog that checks the government’s homework) last looked at the numbers in March, Reeves' fiscal rules were only being met by a relatively small margin of £10bn. In budget lingo, this is known as "headroom". 

Reeves fiscal rules: a reminder

1) Day-to-day spending must be covered by tax revenues, meaning the government only borrows to invest

2) Government debt must be falling as a share of national income.

When it comes to government finances, £10bn amounts to little more than a rounding error – and one that was promptly wiped out by a reported downgrade to OBR economic forecasts and higher borrowing than expected.

And the government’s own actions certainly haven’t helped. 

We’ve had weeks of endless speculation, leaks, one surprise speech, and no fewer than 13 different tax proposals floated in advance. Enough flip-flopping to make the Hokey Cokey look like a deeply disciplined art form.

All of this comes with a heavy economic cost. Consumers tighten up. Confidence wobbles. Businesses delay decisions.

That kind of uncertainty feeds into – and ultimately drags down – the very economic forecasts Reeves relies on to balance the books. And more importantly, it impacts real people, trying to make real decisions.

Now, Reeves’ latest budget is set to rebuild her headroom to an estimated £22bn, which she hopes will provide the stability needed for economic growth without needing to return with even more tax increases in future.

But tax increases are coming. We'll get to those shortly.

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Why the bond market matters

You’d like to think the budget would be all about people. But in reality, there’s always another (more important) audience in the room – the bond market.

In a very real sense, every Chancellor is performing for the investors who decide how expensive it is for the government to borrow. And this was especially important for Reeves, given her commitment to slashing government debt. 

When the government needs money – which it always does – it issues bonds, known as gilts, and investors (including your pension funds) buy them. But the price those investors demand isn’t fixed. It changes constantly, sometimes by the hour, and for one simple reason: confidence (or a lack thereof).

If confidence evaporates, the reaction can be swift and brutal.

This is exactly what we saw after the infamous Liz Truss mini budget: a raft of unfunded tax cuts sent the bond market into panic, and Truss didn’t even manage to outlast a lettuce.

And it’s a much bigger problem for politicians now than it used to be. That’s because both politics and the bond market have changed. 

For years, most government bonds were bought by big defined-benefit pension schemes. They were long-term investors who held onto them for decades.

Now those schemes have mostly closed, the calm, patient buyers have been replaced by banks, hedge funds and asset managers who trade far more actively. They hold bonds for shorter periods, and react instantly to political signals. 

At the same time, politics has become far less predictable. The UK has cycled through six prime ministers in just 15 years, each bringing a different economic agenda.

From an investor’s perspective, that’s chaos. 

This time around, bond markets wanted to be reassured that Reeves’ plan was credible, that the sums added up, and that the Chancellor looks likely to outlast a piece of supermarket salad. 

So far, the reaction has been a bit of a mixed bag: the market isn’t panicking, but it isn’t exactly convinced, either. 

With those explanations out of the way, how exactly are you going to be impacted by upcoming changes? Let's explore one area at a time.

Income tax threshold freeze

In the run-up to the Budget, there were whispers of a straight-up income tax rise, including a 1p increase across all bands that would’ve raised around £9bn. And if income tax had to go up, this would certainly have been the braver – and most straightforward – option.

Instead, Labour have opted for something subtler but just as lucrative: doing nothing.

Freezing tax thresholds sounds pretty neutral. But in reality, it’s one of the most effective ways for the government to pull in billions more from workers without the political damage of directly breaking a manifesto promise.

This is because it creates what’s known as fiscal drag, which is when your wages rise due to the impacts of inflation, but the tax thresholds don’t rise alongside them – meaning you quickly slip into higher tax bands despite feeling like you don't have more money in real terms.

Most tax thresholds were frozen under the previous Conservative government until 2028.

Now, Reeves has opted to extend that freeze until at least 2030-31, pulling in an estimated £7.5bn a year.

All this despite the Chancellor saying last year:

“I have come to the conclusion that extending the threshold freeze would hurt working people. It would take more money out of their payslips… there will be no extension of the freeze in income tax and NI thresholds beyond the decisions of the previous parliament.”

And on top of that, Reeves has promised to combat inflation. The same inflation that they're using to drive their additional tax revenues via fiscal drag.

So, what does this mean for you?

Take a look at the chart below, which we created using figures from the IFS. 

Nearly 18% of working-age adults will be higher-rate taxpayers by 2030, compared with just 10% if thresholds had risen with inflation.

And it's not just higher earners. 72% of people will end up paying some income tax by 2030, versus 64% without the freezes. 

In cash terms, that means that by the time the additional freezes take effect:

• Most people in the basic rate band will pay an additional £261 per year in income tax
• Most people in the higher rate band will pay an additional £1,307 per year in income tax
• Most people in the additional rate band will pay an additional £1,958 per year in income tax.

…all compared with a world where thresholds simply kept pace with inflation (you'd still pay more tax in nominal terms if these thresholds increased).

Of course, 2028 is an election year, which raises the obvious question: will the extended freeze really happen, or will it be quietly shelved the moment it becomes a more concerning political headache?

Cuts to cash ISAs

Cuts in this area have been rumoured ever since the government announced a review of ISAs back in last year’s Spring Statement.

Now it’s official: the cash ISA limit is being cut to £12,000 for anyone under 65. Those over 65 still retain the full £20,000 allowance.

The stated rationale is to help people "get the balance right" between saving and investing, as well as nudging more money into UK companies and the stock market.

It’s not a completely mad idea in principle.

Around 80% of us don’t invest outside our pensions, and most people say it feels too risky – leaving us all a collective £500bn worse off in the 10 tax years leading up to 2023.

So in theory, shrinking the cash ISA limit is a well-intentioned move to try to force people into the potentially better (though riskier) option.

In practice, things are very different.

Cash ISAs are a bit of a national treasure. In fact, over the past decade, cash ISA subscriptions have grown 224% faster than stocks & shares ISAs, with savers piling a whopping £130bn into them in 2023–24 alone.

And that’s where this move could have some unintended side-effects.

An AJ Bell survey found that if the cash ISA allowance were cut, only one in five people would start actually investing instead. The rest would:

• Move money into taxable savings accounts,
• Switch to Premium Bonds, or
• (More troublingly) buy crypto.

And that's from a company that would arguably be incentivised to publish results that say the opposite.

There’s also a broader risk: building societies rely on customer deposits to meet capital requirements and fund mortgages. Siphoning savings away from cash ISAs could potentially put pressure on the cost of lending.

So is this a smart nudge towards long-term investing, or a well-intentioned policy that backfires? Only time will tell.

Cuts to salary sacrifice 

This is potentially the most controversial and disappointing change in the 2025 Budget.

Salary sacrifice is when you give up a slice of your salary, with your employer paying it into your pension instead. Because your official pay is lower, both you and your employer pay less Income Tax and National Insurance.

Lots of companies use this to increase the pensions they can offer staff in a tax-efficient way. 

This is a generosity that Reeves has decided to trim in a move set to raise just short of £1bn by 2030-31. 

From 2029, only the first £2,000 you sacrifice each year will stay free of NI. Anything above that will be treated as a normal employee pension contribution – meaning both you and your employer will pay NI on it. 

There is some logic to it, as Reeves pointed out in her speech: salary sacrifice is used most heavily by higher earners who can afford to give up more of their pay. Lower earners use it less, and the self-employed can’t use it at all, so the benefit skews towards the top.

But the change has consequences. Salary sacrifice is one of the few tools employers have to manage rising costs while also offering meaningful benefits.

And the OBR is clear that employers won’t simply absorb the cost: they expect firms to pass around three-quarters of it back to workers. In their modelling, half of that happens through lower employer pension contributions, and the other half through lower salaries and bonuses.

It also hits long-term saving at exactly the wrong moment – around 40% of the UK is already on track to fall short of even the minimum retirement living standard. 

Mansion tax

"Tax wealth, not work!", they cried. 

Well, here’s the chancellor’s limp-wristed attempt: a much-anticipated 'mansion tax' expected to raise half a billion pound in 2029-30.

From April 2028, properties worth over £2 million will face a new annual surcharge, which the Chancellor says will impact only 1% of homes.

There are four price bands, with annual charges starting at £2,500 for properties worth £2-2.5 million and rising to £7,500 for homes worth £5 million or more – all to be uprated with inflation.

Unsurprisingly, it’s expected to disproportionately impact people living in London, where 68% of £2 million+ home sales take place, and where a "mansion" could just as easily be a four-bedroom flat rather than a 10-bed country estate. 

Once you crunch the numbers, the surcharge gets smaller as a share of the property’s value the more expensive the home is.

• A £2.5k charge on a £2m home works out as roughly 0.125% of its value
• A £7.5k charge on a £10m home is only 0.075%.

A mansion tax that’s actually regressive by design – an odd choice for a policy clearly meant to target those with increasing amounts of wealth.

Scrapping the two-child benefit cap

The government has opted to remove the two-child limit within Universal Credit from 2026. Introduced by the Conservatives in 2017, this cap restricts child tax credit and universal credit to the first two children in most households.

Right now, around one in nine children are impacted by the limit, and the IFS reckons that families receiving support for only the first two lose out on an average £3,455 per year.

Scrapping it is expected to lift around 350,000 children out of poverty, in a move that will cost around £3bn by 2030.

The bottom line

Of course, there were plenty more measures introduced in the budget – we’ve just re-capped the topics we felt were most important. And we’d like to thank the OBR for leaking their report ahead of time – it really helped us stick to our editing deadline.

Overall, we think this is a budget built on the hope that no one pays too much attention to the plumbing.

When it comes to tax, we’d honestly have preferred the government just raised the headline rates – at least look us in the eye while you’re taking our money. Instead, most of the heavy lifting comes through stealth: letting inflation do the dirty work while the Chancellor hopes we "hey! look over there" at the mansion tax.

As for the £12k cash ISA limit, it’s a move that could easily push people towards worse options – or make bad investment decisions – unless it’s paired with real investing education.

Overall, there was no bold reform or bright ideas. Just a series of small measures held together by fiscal drag. Same old, same old.

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