If you’re self-employed, you’ve probably spent more time thinking about your next invoice than your pension, you’re not alone. Only about one in five self-employed workers in the UK pay into a pension, compared to around 80% of employees. Without auto-enrolment to nudge you into saving, everything falls on you. Here’s how to get started, even if your cash flow looks different every quarter.
Why a SIPP Makes Sense for Variable Income
A Self-Invested Personal Pension (SIPP) is the most common pension route for self-employed people in the UK. You control how much goes in, when it goes in, and what it’s invested in. In a strong month, you can put more in. In a quiet month, you can put in nothing. The pension won’t penalise you for that.
For the 2026/27 tax year, the annual allowance is £60,000, but your contributions can’t exceed 100% of your relevant UK earnings. So if your taxable trading profit is £35,000, that’s your cap. Most self-employed people won’t get anywhere near £60,000, but the ceiling is high enough to make larger contributions in bumper years.
How Tax Relief Works in Your Favour
When you pay into a SIPP, your provider will automatically claim basic-rate tax relief (20%) from HMRC. Put in £800 and it gets topped up to £1,000. You don’t need to do anything for that part.
If you’re a higher-rate taxpayer, you’ll claim the extra relief through your Self Assessment tax return. For a 40% taxpayer, every £1,000 in your pension only costs you £600 after all the relief is applied. That makes pensions hard to beat compared to other long-term savings.
How Much Should You Actually Put In?
There’s no single right answer. A common guideline is around 15% of your annual income if you’re starting in your 30s. For employees, that 15% typically includes employer contributions. As a self-employed person, the full amount comes from you, so treat 15% as a minimum. If you’re starting later, you’ll need to go higher.
If your income swings from one quarter to the next, a retirement savings plan built around variable earnings will help you set realistic targets for good years without locking you into commitments you can’t keep when things slow down.
One rule that works in your favour is carry forward. If you didn’t use your full annual allowance in any of the previous three tax years, you can carry the unused amount forward. So if you had a lean couple of years followed by a big contract, you can make a larger lump-sum contribution and still get full tax relief.
Build the Habit, Then Build the Pot
The biggest hurdle isn’t the money. It’s the habit. When cash comes in, it goes towards business costs, living expenses, and a rainy-day fund. Pensions get what’s left, which is usually nothing.
Treat your pension contribution like a business expense. Set a percentage of every invoice and move it into your SIPP before you spend it elsewhere. Even 5% is a start. You can always increase it later.
Don’t Wait for the “Right Time”
The maths on pensions favours time in the market over almost everything else. Someone who puts in £200 a month from age 30 will typically end up with a larger pot than someone who puts in £400 a month from age 45, even though they’ve contributed less overall. Compound growth does the heavy lifting, but only if you give it enough runway.
Don’t forget the State Pension either. It’ll provide a baseline, but on its own it won’t fund a comfortable retirement. The private pension you build now will be the difference between getting by and living well.
If you’ve been putting this off because your income is unpredictable, that’s a reason to start now, not later. Even small, irregular contributions will add up over decades.
Warning: Both the value of your investments and the income they yield can fluctuate over time. There’s always a risk you could receive less than your initial investment. How investments have performed before is no promise of how they’ll perform in the future.