ISAs vs pensions: how do they compare?
When it comes to planning for your retirement, two options tend to dominate the “what should I do?” conversation: pensions and ISAs. Both can help you build a nest egg for your future, but they work in quite different ways – and each comes with its own set of pros and cons.
Some people swear by pensions, others prefer ISAs, and many find that a combination of both works best.
In this guide, we'll break down what makes each option stand out, compare them side by side, and help you figure out where you might want to put your money.
What's an ISA?
An ISA (Individual Savings Account) is a kind of account that protects your savings or investments from UK income tax and capital gains tax. You can put up to £20,000 into ISAs each tax year (see the Government website for more details). You can split this however you like (within restrictions) across different types of ISA:
Cash ISAs work like regular savings accounts but without you having to pay tax on the interest.
Stocks and Shares ISAs let you invest, and any returns you make are free from UK income tax and capital gains tax.
Lifetime ISAs give you a 25% government bonus if you're saving for your first home or retirement.
Junior ISAs let you save up to £9,000 tax-free for children. They can be Cash ISAs or Stocks and Shares ISAs.
All these options (except for the Junior ISA) fall under your £20,000 annual allowance, making ISAs quite a versatile tool for different life stages and goals. Tax treatment depends on individual circumstances and may change in the future, so always check the government website for the latest.
What's a pension?
A pension is designed specifically for retirement. There are two main types of private pensions: workplace pensions (which your employer sets up), and personal pensions (which you set up yourself). Personal pensions also include Self-Invested Personal Pensions (SIPPs), which give you much more control over exactly what you invest in.
The annual allowance for pension contributions is £60,000, or 100% of your earnings – whichever is lower. You can pay in more than the £60,000 (you'll just pay tax on it), but you have to remove contributions that go over 100% of your yearly salary
But here's where pensions really shine: you get tax relief on what you pay in (within your £60,000 allowance).
So if you're a basic rate taxpayer and put £100 into your pension, the government automatically adds £20, so £120 goes into your pot. Higher and additional rate taxpayers can claim even more back through their tax return. That's a pretty strong incentive.
Pensions vs ISAs
Both options have clear benefits.
Pensions give you more upfront tax relief and higher contribution limits, but you can't touch the money until you're 55 (or 57 from 2028).
ISAs don't offer any government tax relief (meaning you don’t get any money back from the government) when you pay in, but all your withdrawals are tax-free and ISAs usually give you more flexibility to withdraw money whenever you need.
It’s worth noting that both pensions and ISAs are probably better than keeping your savings in a normal bank account, as they help lower the amount of tax you need to pay.
But let's compare the two in more detail:
Investing in Monzo ISAs
Monzo offers two kinds of ISA to help you save and invest:
Stocks and Shares ISA: This lets you invest in funds managed by BlackRock, one of the world's largest asset managers. You're investing in a range of global stocks, shares and other investments, which means your money has the potential to grow more over the long-term than it would in a standard savings account (based on savings interest rates).
Plus, any returns you make are tax-free – you won't pay Capital Gains Tax on your investment growth. Of course, investments can go down as well as up, so there's always some risk involved. But if you're comfortable with that and you're investing for the long term, it could be a good option. Find out about Monzo's Stocks and Shares ISA.
iShares® and BlackRock® are trademarks of BlackRock, used under licence. BlackRock has no obligation or liability in connection with any product or service offered by Monzo.
Cash ISA: If you'd rather keep things simple and avoid investment risk, Monzo's Cash ISA gives you a place to save with tax-free interest. It's easy to set up, you can access your money when you need it, and you don't have to worry about market ups and downs.
Just keep in mind that while Cash ISAs protect you from investment volatility, they still carry inflation risk. Both ISA options fit into your £20,000 annual ISA allowance, so you can choose what works for your goals and risk appetite.
It's worth noting that the recent national budget included changes coming in from 6 April 2029. National Insurance relief on salary sacrifice pension contributions will be capped at £2,000 a year. Currently, there’s no cap – so salary sacrifice pensions could become less tax-efficient for some people in the future.
Monzo pensions
We offer pension consolidation to help you bring all your old workplace pensions together in one place. If you've changed jobs a few times over the years, you might have several pensions scattered across different providers. It's easy to lose track of them, and managing multiple accounts can be a hassle.
With Monzo, you can consolidate and top up your pensions into a single Self-Invested Personal Pension (SIPP). This makes it much easier to see how much is in your pension and keep track of your retirement plans. You'll invest in funds managed by BlackRock, giving you access to a broad range of investments without having to pick individual stocks yourself.
You should also look at the fees you're currently paying and whether there are any exit charges for transferring out. It's also worth checking whether your existing pensions have any valuable features (like guaranteed annuity rates or final salary benefits) before consolidating, as you wouldn't want to lose those.
Choosing a pension or ISA
So, which one should you go for? Many financial experts will tell you that you probably need both. Pensions are brilliant for long-term retirement planning because of that tax relief – it's like getting a boost from the government on every contribution. But pensions lock your money away until you're at least 55, so they're not much help if you want to retire at 50, or if you need access to your money before then.
That's where ISAs come in. They let you build up savings or investments without paying tax, regardless of what you’re saving for.
ISAs are also useful if you have any kind of gap between when you stop working and when you can actually access your pension. You can withdraw from a Monzo Cash ISA or Stocks & Shares ISA at any age without penalty, which gives you lots more flexibility. Some people use ISAs to build up funds for early retirement or semi-retirement, then switch to their pension once they hit the minimum age.
Of course, not everyone can afford to retire early, but the good news is that whether you choose to prioritise a pension or an ISA – or use both – Monzo's got options to help. We offer ISAs, Self-Invested Personal Pensions, and a pension consolidation service, so whatever route you take, we can support you along the way.
Monzo current account required. UK residents only. Ts&Cs apply.
To open a Monzo Pension you must be between 18-70 years old only. The value of your pension could go up or down and you could get back less than you put in.
To open an ISA you must be 18+ years old. Tax treatment depends on individual circumstances and may change in the future.
Questions? Answers.
Should I use an ISA or a pension first?
If you have a workplace pension where your employer contributes, always pay into that first – it's basically free money from your employer plus tax relief from the government. After that, it depends on your goals. If you're saving for retirement and won't need the money until you're 55+, a pension's tax benefits are hard to beat.
But if you might need access earlier, want flexibility, or are saving for something other than retirement, prioritise your ISA. Ideally you'd contribute to both if you can afford it.
Is it better to pay into a pension or an ISA?
For pure retirement saving, pensions usually win because of the tax relief. A basic rate taxpayer effectively gets a 20% boost on contributions, and higher rate taxpayers get even more. But pensions lock your money away.
ISAs don't give you tax relief upfront, but the interest you earn is tax-free and you can usually access the money anytime. The "better" choice really depends on when you'll need the money and whether you can manage without it until pension age.
Can I have an ISA and a pension?
Yes! In fact, having both is often the smartest move.
You can pay up to £60,000 into pensions and £20,000 into ISAs each tax year (subject to earnings for pensions). Many people use pensions as their main retirement fund to get that handy tax relief, then use ISAs for medium-term goals or to build up funds they can access before they’re pension age.
The two can work well together as part of a balanced financial plan.