This page provides a very high level overview of how pensions work. It’s a large and complex area, so we’ve provided links to further resources throughout. But there are two very important things you must know:

  1. Never opt-out of a pension. Your employer pays money into your pension – this is part of your salary, which you simply miss out on if you opt out.
  2. Due to the magic of compound interest, the sooner you start your pension, the less you need to contribute to it yourself.

Always auto-enroll in your pension โœ…

Once you have a small emergency fund you should make sure you are enrolled in your employer’s automatic enrolment pension scheme. This is a minimum of 3% extra pay in exchange for you contributing 5% of your take-home pay.

This money is placed in a pension, meaning you can’t access it until at least age 55. Until then, it will grow, both from your and your employer’s contributions and from growth of the investments.

This age access restriction sometimes puts people off. However, due to the employer match and tax relief, if you choose to opt out, you don’t simply get the money you would have had in your pension in your pocket now – you’ll get only a fraction of it.

Tax relief on pension contributions ๐Ÿ’ธ

Income tax

You don’t pay income tax on money you put into your pension.

This means that while you would normally pay ยฃ20 in income tax for every ยฃ100 earned (for money earned within the basic rate tax bracket), and receive ยฃ80 in your pay to spend or save, in a pension you can save the whole ยฃ100. This tax relief happens automatically.

For money earned in the higher rate (40% tax) bracket or higher, the effective tax-relief is at least 40%. In some cases it can be as much as 75% (if you have three children and earn between ยฃ50,000 and ยฃ60,000 – for more details see this blog post from Paul Lewis in 2012).

In most cases this additional tax relief is not automatic and needs to be claimed. If you are a higher-rate taxpayer and reading this is news to you, head to the HMRC guidance page and come thank us on the Discord for the tax relief cheque you’ll receive once you get in touch with them!

Salary sacrifice/National Insurance

Additionally, some employers will allow you to pay into your pension using a ‘salary sacrifice’ arrangement. This means that instead of you earning ยฃ100 and putting it in the pension, they reduce your salary by ยฃ100 and increase their contributions to your pension by ยฃ100.

This saves you another tax – national insurance, which for most people is charged at 12%. Your employer will also save on their national insurance contributions, and some employers will even pay some or all of that saving into your pension too.

The magic of compound growth ๐Ÿช„

The earlier you start saving, the more time is on your side. The growth of your savings and investments will compound over time.

Graph showing the value of an investment portfolio over time. ยฃ200 per month is invested from age 21 to 65. The blue portion of the graph showing contributions made goes steadily up by ยฃ2400 per year, and the red portion representing additional value gained from growth curves upwards, getting larger as time goes on. At age 65, the contributions total ยฃ108,000 and the total value of the portfolio is ยฃ383,280.

When you start investing in your pension, most of the money that is in the account is money you (and your employer) contributed. However with time, growth starts to accumulate, until it becomes the bigger contributor to the total value.

The higher the growth rate % the faster this will happen – we’ve used a reasonably conservative estimate of 5% in this illustration. At 6%, the final value of the portfolio would be ยฃ510,584.

Remember that you can only ever start this curve at the beginning. By starting it a year later, the year you will miss out on is the one at the end of the graph. In this scenario, the last five years on the chart provided ยฃ127,156 growth!

The longer you leave regular savings, the more expensive it becomes to catch up.

Pension growth isnโ€™t the same as savings account interest. Both will compound over time, but there are important differences. Although we talk about growth rates of fixed percentages, in reality the growth will depend on stock markets, interest rates, and all sorts of other factors.

When we talk about average percentages, weโ€™re looking at long-term trends, but 5% average might instead be +10%, -3%, +8% over three years.

For more illustrations of the power of compound interest, see:

The state pension ๐Ÿ‘ด๐Ÿฝ

As of March 2021, the full state pension is ยฃ175.20 per week, paid four-weekly, which comes to ยฃ9,110.40 per year. State pension age is about 10 years later than private pension access age.

State pension entitlement is based on your National Insurance contributions. You need a minimum of ten years of contributions (or equivalent credits) to receive any state pension, and the full amount requires 35 years of contributions.

Pension calculators ๐Ÿ“Š

You can use the calculators below to forecast your future pension income at different contribution rates. Your pension doesn’t need to be invested with these companies to use their calculators.

Note different calculators will use different assumptions. Take the time to read them to understand how the numbers they provide have been calculated.

Frequently Asked Questions โ„น๏ธ

‘Half your age’ rule โž—

The most common recommendation for retirement saving is that you should save half your starting age as a percentage of your income – if you start saving for retirement aged 20 you should save 10% of your income for the rest of your working life, if you start age 30 you will need to save 15%. If you leave it until you’re 40 you need to save 20% of your salary.

This includes employer contributions to your pension – so to reach 10%, it could be 6% your contributions and 4% employer contributions.

This ‘rule’ is intended to illustrate the power of compound interest and the value of starting early. It’s a good quick reference point to give you an idea of how much you might need to contribute if you’re starting from scratch. For a more accurate basis for planning, use the calculators provided above.

When can I access my pension? โŒ›

State pension age is currently 66, and increasing to 67 by 2028, anticipated to increase again to 68 by 2039. You cannot start taking a state pension younger than this, but you can delay it to have higher payments in the future.

Currently, most personal and occupational pensions can be accessed at age 55. There are plans to raise this age to 57 in line with the proposed state pension access changes. You will need to check your specific scheme to be sure of what it permits, as they may vary.

If I opt out, how much money will I lose out on? ๐Ÿ’ฐ

If you’re considering opting out of a pension, the short answer is ‘don’t’, but the longer answer is ‘calculate how much money you’d be giving up on before you decide’. For example:

If you earn ยฃ25,000 per year and you auto-enroll in a pension where you pay 5% with a 3% employer match (the legal minimum), you will pay ยฃ78.15 into your pension per month and your employer will pay ยฃ46.90.

If you choose to opt out you will receive ยฃ62.57 extra pay per month, compared to ยฃ125.07 in your pension.

If you have a higher employer match available, or pay 40% tax, or have salary sacrifice, the numbers for a pension would look even better. Use these calculators to work it out:

And of course because you cannot access the money immediately, there’s time for compound interest to work its magic.

I want to retire early. Do I still need a pension if I’ll retire before I can access it? ๐Ÿ”ฅ


If you intend to stop working at e.g. age 45, that means you’ll have approximately 10 years of expenses to fund before pension access age (ages 45-55), and approximately 40 years after it (ages 55-95). Given the employer match and tax advantages of pensions, you will reach your total savings required much faster if you use them efficiently.

Should I change what my pension is invested in? โš™๏ธ

For the most part, the default funds your pension provider selects will work just fine and there’s no need to adjust. Take a look at our pages on investing and index funds if you want to get more hands-on.

Should I transfer and merge old pensions? ๐Ÿ—ƒ๏ธ

The most important thing is not to lose track of any pensions you own. If you have multiple pension pots from different jobs, it can be helpful to combine them so there are fewer to keep tabs on.

Your pots will not grow any faster when they are combined. But if your providers have different fund choices and fees, those will have an effect on the outcome. Pay attention to these when working out where to transfer to/from.

Why am I not automatically enrolled? ๐Ÿคท

If you’re employed but haven’t been automatically enrolled, it means you’re either too young or don’t earn enough. You’re almost certainly still eligible to join, but will have to opt-in. Speak to your employer.

What if I’m self-employed? ๐Ÿ–ฅ๏ธ

If you’re self-employed you will need to arrange your own pension scheme. This is a higher priority than it would be otherwise.

I’m in a Defined Benefit pension scheme ๐Ÿฆ„

Lucky you! Just don’t opt out and you’re good to go ๐Ÿ™‚

Note that a lot of the explanations and advice on this page don’t apply to you. Take the time to read and understand the details of your specific scheme, whether it’s NHS, LGPS, alpha, Teacher’s Pension Scheme, etc. There will be guidance available from the scheme, and you can also speak to your union if applicable.

…Seriously though, don’t opt out. Sometimes people do some back-of-the-envelope calculations and think they can beat their DB pension with personal investments. This always relies on an underestimation of the value (and price) of a guaranteed income that a DB pension provides.

Helpful resources ๐Ÿ“š