If you run your own business or earn through self-employment, knowing what to do with spare money can be as important as knowing how to make it. Whether you have a few hundred pounds from a good month or a larger lump sum after tax, the right move depends on your tax position, your debts, and your goals. Here are five practical, tax-smart ways to put spare cash to work in 2026.
What to do with spare money in 2026
1. Build a cash emergency fund first
Before you invest or overpay debt, set aside a cash buffer. Most financial planners recommend three to six months of essential living costs in an easy-access savings account. For a self-employed woman, six months is usually the safer target because income can fluctuate and client work can dry up quickly. A buffer also gives you practical freedom: the ability to leave a difficult contract, turn down low-paid work, or cover a gap between invoices without resorting to credit.
Keep this fund in a separate account so you are not tempted to spend it. In the 2026/27 tax year, basic-rate taxpayers can earn up to £1,000 in savings interest each year without paying tax through the personal savings allowance, while higher-rate taxpayers can earn £500, according to HMRC. Additional-rate taxpayers receive no allowance. This means you can still earn some interest on your buffer without an immediate tax bill, though you should compare rates regularly.
2. Pay off expensive debt
High-interest debt, such as credit cards, store cards, or unsecured loans, usually costs more than you can earn from savings or investments. Paying it off gives you a guaranteed return equal to the interest rate you no longer pay. It also reduces your fixed monthly outgoings, which is valuable when you are self-employed.
Not all debt should be cleared early. Most UK student loans are income-contingent and written off after a set period, so overpaying them rarely makes financial sense. Interest-free credit is also low priority. If you are unsure which debts to tackle first, speak to a debt adviser such as StepChange or Citizens Advice.
3. Top up your pension
Pension contributions remain one of the most tax-efficient ways to use spare money. In the 2026/27 tax year, you can receive tax relief on contributions up to the annual allowance of £60,000 or 100% of your relevant UK earnings, whichever is lower, according to HMRC. Higher and additional-rate taxpayers can claim extra relief through their self-assessment return, making pensions particularly attractive if you have had a profitable year.
If you are self-employed, you do not have an employer adding to your pot, so making regular contributions yourself is essential. You claim basic-rate tax relief through your pension provider and any higher-rate relief through your self-assessment tax return. A low-cost personal pension, a SIPP, the government-backed NEST scheme, or an ethical pension fund are all options. Check the fees, investment choices, and minimum contributions before you commit. Be aware that the normal minimum pension age is rising from 55 to 57 from 6 April 2028, according to gov.uk, so plan when you will need access to the money. You can read more about pension tax relief on gov.uk.
4. Use your ISA allowance
For money you may need before retirement, use your ISA allowance. In the 2026/27 tax year, you can save or invest up to £20,000 across cash ISAs, stocks and shares ISAs, and innovative finance ISAs, according to gov.uk. Any interest, dividends, or capital gains inside an ISA are free from UK tax, which makes them a useful wrapper whether you are building short-term savings or a long-term investment portfolio.
If you are saving for your first home, a Lifetime ISA lets you pay in up to £4,000 each tax year in 2026/27 and the government adds a 25% bonus, up to £1,000 a year, according to gov.uk. You can use it towards a first home worth up to £450,000 or keep it until age 60. Withdrawals for other purposes usually trigger a 25% penalty, so only use it for those goals.
5. Invest in yourself or your business
Spare money can also buy skills, time, or growth. That might mean a professional qualification, a course that raises your rates, better equipment, or outsourcing admin so you can focus on revenue-generating work. If the spending is wholly and exclusively for your business, it may be an allowable expense that reduces your tax bill. Our guide to allowable expenses for the self-employed explains what you can claim.
Women-led businesses are a growing force in the UK economy. See the latest figures on the Prowess Women in Business: Key UK Facts page. Many women founders reinvest personal savings to keep control rather than take external funding. If that describes you, treat this spending as an investment with a clear expected return, not a vague expense. Track the outcome so you know whether the money was well spent.
Five action steps to take now
- Calculate your essential monthly costs and aim for an emergency fund of three to six months.
- List your debts by interest rate and clear the most expensive first, leaving income-contingent student loans until last.
- Check how much of your 2026/27 pension annual allowance and ISA allowance you have left.
- If you are self-employed, set up a regular pension contribution before the tax year ends.
- Identify one skill, tool, or outsourced task that could increase your income or free up your time.
Knowing what to do with spare money is not about chasing the highest return. It is about matching each pound to your stage of life, your business, and your tax position. Start with security, remove expensive debt, then use the tax wrappers and allowances the UK offers to make your money work harder.
