The Self-Employed Money Model

When you're employed, the financial system does a great deal of work for you. Tax is deducted before you see your pay. Pension contributions happen automatically. NI is calculated and collected by your employer. You receive a net figure and plan around it.

When you're self-employed, all of that becomes your responsibility. The gross income that lands in your account isn't yours to spend freely. A portion of it belongs to HMRC. Until you've set it aside, you're effectively spending someone else's money, and many people don't realise this until the January tax bill arrives.

The fundamental shift in thinking

Employed income is net by the time you see it. Self-employed income is gross. This is the single most important thing to internalise when you move from employment to self-employment. Gross revenue is not your income. Gross revenue minus tax, minus business costs, is your income.

Separating business and personal money

The first practical step is a dedicated business bank account, even if you're a sole trader with no legal obligation to have one. Mixing business and personal money creates two problems. It makes your accounts harder to manage, and it makes it impossible to see how your business is actually performing — separate from how you're personally spending.

Revenue goes into the business account. Your tax set-aside comes out of it. Business costs are paid from it. What remains is what you can legitimately pay yourself.

The tax set-aside habit

Every time money comes in, set aside a portion immediately. Don't wait until January. Don't wait until you know the exact figure. Set aside a consistent percentage and let it accumulate in a separate savings account.

The right percentage depends on your income level and circumstances, but as a starting point, sole traders earning at the basic rate should set aside around 25% of net profit. Higher-rate earners (profits above £50,270) need closer to 35–40%, since both income tax and Class 4 step up above that threshold. Once you've been through a full year, your prior tax bill is your best guide. If you're making payments on account, which HMRC requires once your tax bill exceeds £1,000, factor those into your planning too.

Self-employment tax structure at a glance

Planning around irregular income

Irregular income requires a different relationship with money than a regular salary. The temptation in a good month is to spend freely. The discipline is to smooth it: pay yourself a consistent monthly amount that reflects your average earnings over a longer period, not your best month.

A practical approach is to treat your business account as a reservoir. Revenue flows in irregularly. You draw a consistent salary from it monthly. In strong months the reservoir fills. In quieter months you draw from the buffer you've built. This prevents the feast-and-famine cycle that causes many self-employed people significant financial stress.

A note on limited companies

Some self-employed people operate through a limited company rather than as sole traders. The mechanics are different: the company pays corporation tax on profits (19% on profits up to £50,000, rising to 25% above £250,000, with marginal relief between), and you take income as a combination of salary and dividends. Dividend tax rates rose in April 2026 — basic rate is now 10.75%, higher rate 35.75%, additional rate 39.35%. Whether a limited company makes sense depends on profit level, intended use of profits (drawn out vs reinvested), and admin tolerance. It's a question worth paying an accountant to answer properly.

What to track and when

Self Assessment requires an annual return, but the underlying record-keeping should be continuous. Keep receipts for business expenses. Record income as it arrives. Reconcile your accounts monthly rather than leaving it all to January. The administrative burden of self-employment is real, but it's far lighter when done little and often than when it accumulates into a year's worth of paperwork in the final week of January.