If you’re reading this, you’ve got exactly ten days.
Ten days before the 2025/26 tax year takes its final bow and the 2026/27 tax year comes dancing in on April 6th. Here at Makes Sense Accountants, we call this the "Golden Window." It’s that final stretch where you can make some serious moves to protect your hard-earned money from the taxman before the clock strikes midnight on April 5th.
I’m Tim Hammond, and if there’s one thing I’ve learned in my years as Managing Partner, it’s that people hate leaving money on the table. Yet, every year, thousands of people do exactly that because they miss the deadline for their ISA and pension contributions.
In the accounting world, we talk a lot about "use it or lose it." When it comes to your tax-free allowances, that phrase isn't just a cliché, it’s the law. Once we hit April 6th, any unused allowance from the current year is gone forever. You can’t roll it over, you can’t backdate it, and you certainly can’t ask HMRC for a "do-over."
So, let’s get you prepped. Here is everything you need to know to maximize your allowances in the next ten days.
The ISA Allowance: Your £20,000 Gift
The Individual Savings Account (ISA) is one of the most powerful tools in your financial kit. Why? Because any growth, interest, or dividends you earn inside an ISA is completely tax-free.
For the 2025/26 tax year, your annual allowance is £20,000. You can put that whole amount into one type of ISA, or split it across several.
The Different Flavours of ISA
- Cash ISAs: Great for short-term savings or an emergency fund. You get interest, and the taxman doesn't touch a penny of it.
- Stocks and Shares ISAs: If you’re looking at the long game, this is where you invest in the market. Historically, this has been a great way to outpace inflation, and again, all capital gains and dividends are tax-exempt.
- Lifetime ISAs (LISA): If you’re aged 18–39, you can put in up to £4,000 a year. The government adds a 25% bonus on top of whatever you save (up to £1,000 a year). If you’re saving for your first home or retirement, this is basically free money.
- Innovative Finance ISAs: For those into peer-to-peer lending.
The "Use It or Lose It" Rule
If you have £5,000 left of your allowance on April 6th, you don’t get a £25,000 allowance for the new year. You just get the standard £20,000 again. That £5,000 "gap" is a missed opportunity for tax-free growth.
Don’t Forget the Kids: Junior ISAs
If you have children under 18 living in the UK, you have another hidden gem: the Junior ISA (JISA). For the 2025/26 tax year, the limit is £9,000 per child.
This doesn’t count towards your own £20,000 limit. It’s a fantastic way to build a nest egg for them that they can access when they turn 18. Whether it’s for university fees, a first car, or a house deposit, starting early makes a massive difference thanks to compound interest.
Pensions: The Ultimate Tax Efficiency
While ISAs are great for accessibility, pensions are the heavyweight champions of tax planning.
When you contribute to a pension, the government essentially gives you a refund on the income tax you’ve already paid.
- Basic rate taxpayers: A £80 contribution magically becomes £100 in your pot.
- Higher rate taxpayers: You can claim back even more through your self-assessment tax return.
For most people, the annual allowance for pension contributions is £60,000 (or 100% of your relevant UK earnings, whichever is lower). If you’re a high earner, this might be tapered down, so it’s always worth checking with us if you’re unsure.
Why Pensions Win at Year-End
If you’ve had a particularly profitable year, maybe your company had a record quarter or you received a significant bonus, putting that extra cash into your pension is one of the smartest ways to reduce your overall tax bill. By lowering your "taxable income," you might even pull yourself back under a tax threshold, potentially preserving your Personal Allowance or avoiding the High Income Child Benefit Charge.
We’ve seen cases where proactive pension planning has saved clients thousands in literal "avoidable" taxes. For a deeper look at how we handle this, check out our guide to proactive tax planning with MS Accounts.
Beating the "60% Tax Trap"
This is a big one for those earning between £100,000 and £125,140. For every £2 you earn over £100k, you lose £1 of your personal allowance. This creates an effective tax rate of 60%.
By making a pension contribution before April 5th, you can bring your "adjusted net income" back down towards £100,000. Not only are you boosting your retirement fund, but you’re also reclaiming your personal allowance. It’s a double win that many people miss because they wait until it's too late in April to check their figures.
The Clock is Ticking: Practical Tips
You might think, "I’ve got until the 5th, I’ll do it then."
Please, don't.
April 5th falls on a Sunday this year. Most banks and investment platforms have processing times. If you try to move £20,000 at 11:55 PM on Sunday night, there is a very high chance the transaction won't clear until Monday morning, April 6th. If that happens, you’ve missed the boat.
Tim’s Checklist for This Week:
- Check your balances: Log in to your ISA and Pension providers. See exactly how much of this year's allowance you’ve used.
- Top up the LISA first: If you’re eligible for the Lifetime ISA bonus, get that £4,000 in there as a priority.
- Calculate your "relevant earnings": Don't over-contribute to your pension beyond what is tax-efficient. If you’re self-employed, this can be tricky, so feel free to contact us for a quick review.
- Think about the "Carry Forward": Unlike ISAs, pensions allow you to "carry forward" unused allowances from the previous three years. If you’ve maxed out this year but have some spare cash, we can look back at 2022, 2023, and 2024 to see if we can squeeze more in.
Looking Ahead: 2026/27 and Beyond
The government has been making noises about changing ISA structures in the coming years. There are suggestions that the Cash ISA allowance might be reduced for younger savers to encourage more market investment. While these aren't set in stone yet, it reinforces the idea that you should use the generous allowances available to you now.
Tax planning isn't just about filing a return at the end of January; it's about making the right moves throughout the year to ensure you’re keeping as much of your money as possible. Whether it's managing VAT registration or choosing between dividends and salary, every decision counts.
Final Thoughts
The end of the tax year can feel like a mad scramble, but it doesn't have to be. By taking an hour this evening to review your ISA and pension status, you could potentially save yourself thousands of pounds in future taxes.
Think of it as a gift to your "Future Self." The Tim Hammond of 2036 will be very grateful that the Tim Hammond of 2026 took ten minutes to top up his pension on March 25th.
If you’re feeling overwhelmed by the numbers or you’re not sure how much "room" you have left in your allowances, give us a shout. At Makes Sense Accountants, we’re here to make the complex stuff feel, well, sensible.
Drop us a message on our contact page or explore our full range of services to see how we can help you stay ahead of the game.
Let’s get those contributions sorted before the deadline!
Cheers,
Tim Hammond
Managing Partner, Makes Sense Accountants