Last updated: August 2026
The standard advice is three to six months of essential expenses in easy-access savings. That advice was written with a salaried employee in mind — someone whose income arrives in the same amount, on the same date, every month. If you’re self-employed, that’s not quite your situation, and the standard number undersells what you actually need.
This is general guidance, not personal financial advice — your own target depends on how variable your income genuinely is and what other buffers you have.
Why the standard 3-6 months isn’t quite right for self-employed income
The three-to-six-month range assumes the main risk is a single, discrete event — redundancy — followed by a job search. Self-employed income risk looks different: it’s less “income stops entirely overnight” and more “income declines gradually, unevenly, and it’s genuinely hard to tell in month two of a slow patch whether it’s a blip or the start of something longer.” That ambiguity is exactly why the fund needs to be larger — you’re not just covering a known gap, you’re covering the uncertainty of not knowing how long the gap will last.
Most guidance aimed specifically at self-employed people lands on six months as a reasonable minimum, with some recommending six to nine months for those with genuinely volatile income (a small number of clients, a seasonal business, or a sector prone to sudden drop-off).
Two funds, not one
This is the part generic emergency fund advice usually misses entirely: self-employed people typically need to think about two separate pots, not one.
1. The emergency fund itself — three to six-plus months of essential personal living expenses, exactly as described above. This is for genuine shocks: illness, a major unexpected bill, a sudden and sustained drop in work.
2. A tax reserve — separate from the emergency fund, and not really optional. A meaningful share of what lands in your business account — commonly cited as roughly 25-30% — isn’t actually yours; it’s owed to HMRC via Self Assessment and, depending on structure, National Insurance. Treating this as part of your emergency fund (or worse, part of your regular spending) is one of the most common ways self-employed finances go wrong — not because of a genuine emergency, but because the tax bill was never properly set aside in the first place.
Keeping these separate — ideally in genuinely separate accounts — means a slow month doesn’t tempt you into dipping into money that was never really available to spend.
How to actually calculate your target
- List essential expenses only — housing, utilities, food, transport, insurance, minimum debt payments. Leave out anything you’d cut immediately in a genuine emergency (subscriptions, dining out, discretionary spending).
- Multiply by your target number of months — six as a baseline; toward nine if your income is genuinely lumpy or concentrated in one or two clients/income sources.
- Set the tax reserve target separately — based on your actual effective tax rate from previous years’ Self Assessment returns, not a rough guess.
Building it without it feeling impossible
If six months of expenses feels like an unreachable number from zero, it is genuinely fine to build in stages rather than all at once:
- First milestone: £1,000. This alone handles most small, sudden costs (a car repair, an appliance breaking) without reaching for credit.
- Then: one month of expenses, then three, then the full target. Each stage is a real improvement in resilience even before you reach the end goal.
- Automate it if income allows — a standing order on the days you’re typically paid, or a fixed percentage of every invoice paid, moved automatically rather than left to a monthly decision.
Where to keep it
Cash, not invested — an easy-access savings account or instant-access cash ISA, separate enough from your everyday spending account that you won’t dip into it casually, but accessible within a day or two if you genuinely need it. This fund’s entire job is to be worth exactly what you put in in the moment you need it; market risk defeats the purpose entirely.
How this connects to everything else on this site
An emergency fund and a tax reserve aren’t competing with your pension or ISA contributions — they come first. Locking money into a SIPP or investing it in an ISA is much harder to justify if a single slow quarter would force you to raid it or, worse, go into debt. Build the buffer, then build the pension and investments on top of it.
This article is for general information only and does not constitute financial advice. Everyone’s circumstances differ — speak to a qualified adviser or accountant if you’re unsure what’s right for your situation.