Business Interruption Insurance — Is It Worth It for Sole Traders?

Imagine waking up one morning to find that a burst pipe has flooded your workshop, a fire has gutted your office, or a cyberattack has taken your entire system offline. The physical damage is bad enough, but what really hurts is the income you'll lose while everything is being repaired or rebuilt. Bills don't stop just because your business has.

That's the scenario business interruption insurance is designed to protect against. It's a type of cover that replaces your lost income and covers ongoing costs when something forces your business to stop or significantly reduce its operations.

For larger companies, business interruption insurance is standard. But for sole traders and micro-businesses, the question is less straightforward: is it worth the premium, or is it just another expense you don't need?

Let's work through it.

What Is Business Interruption Insurance?

Business interruption insurance (BI insurance) compensates you for the financial losses you suffer when your business can't operate normally due to an insured event. It's not a standalone policy — it's almost always sold as an add-on to a property insurance, contents insurance, or combined business insurance policy.

The logic is simple. Your property insurance might pay to repair a fire-damaged office, but it won't replace the income you lose during the three months it takes to get back up and running. Business interruption insurance fills that gap.

A typical BI policy covers:

• Lost revenue — The income you would have earned if the interruption hadn't happened
• Fixed costs — Ongoing expenses you still have to pay even though you're not trading, such as rent, loan repayments, insurance premiums, and subscriptions
• Increased costs of working — Extra expenses you incur to get back to normal, such as renting temporary premises, hiring equipment, or paying for expedited repairs
• Employee wages — The cost of keeping staff on the payroll during the interruption (if applicable)

The key phrase is "insured event." Business interruption insurance only kicks in when the interruption is caused by something your underlying property or contents policy covers — typically fire, flood, storm, theft, or vandalism. If your business stops for a reason that isn't covered by the underlying policy (for example, losing a major client), BI insurance won't help.

How Does It Work in Practice?

Let's walk through a concrete example.

Sarah is a sole trader who runs a small pottery studio. She rents a workshop, has a kiln, materials, and finished stock. Her annual revenue is around £45,000 and her fixed costs (rent, insurance, utilities, subscriptions) total about £12,000 per year.

A fire damages her workshop. Her property insurance covers the cost of repairing the building (that's the landlord's insurance, actually, but let's say her contents insurance covers her equipment and stock). However, it takes four months before the workshop is usable again.

Without business interruption insurance, Sarah earns nothing for four months but still has to pay her rent (assuming she's locked into a lease), her insurance premiums, her phone contract, and other fixed costs. She's out roughly £15,000 in lost revenue and £4,000 in fixed costs that she can't avoid — nearly £20,000 in total.

With business interruption insurance, the policy would cover her lost revenue (or at least a significant portion of it) and her ongoing fixed costs. She might also be able to claim the cost of renting temporary workspace to keep operating while her studio is repaired.

The difference between those two scenarios could be the difference between surviving and going under.

What Doesn't It Cover?

Understanding the limitations is just as important as understanding the coverage:

• Events not covered by your underlying property/contents policy — If your interruption is caused by something excluded from your property insurance, BI won't pay out either
• Planned closures or maintenance — Choosing to close for renovations or holiday isn't an insured event
• Loss of clients or market changes — BI insurance covers physical events that prevent you from trading, not commercial difficulties
• Pandemic or government-mandated closures — This was a huge issue during COVID-19. Many standard BI policies didn't cover pandemic-related closures, leading to widespread disputes. Some policies now explicitly exclude pandemics; others have been updated to include them. Check your wording carefully
• Uninsured property damage — If you don't have contents or property insurance, or if the damage was caused by an excluded peril, BI won't apply
• Losses beyond the indemnity period — BI policies have a maximum indemnity period (typically 12, 18, or 24 months). If your business takes longer than that to recover, you're on your own for the remaining period

Is It Worth It for Sole Traders?

This is the central question, and the answer depends on your specific situation. Here are the factors to consider:

How location-dependent is your business? If you work from a specific premises — a workshop, studio, shop, clinic, or office — and you couldn't easily relocate, business interruption insurance is more valuable. If you work from a laptop and could set up anywhere with Wi-Fi, the risk of being unable to trade due to property damage is much lower.

How much would you lose if you couldn't work for three months? For a sole trader earning £30,000-£50,000 a year, three months of lost income is £7,500-£12,500. Can you absorb that? If you have substantial savings or an emergency fund, you might decide to self-insure. If you're running on tight margins, the loss could be catastrophic.

Do you have fixed costs that continue regardless? If you're locked into a lease, have equipment on finance, or have other non-cancellable commitments, these costs pile up even when revenue stops. BI insurance covers them.

Do you have employees? If you have staff, you'll likely want to keep paying them during a temporary closure (both to retain them and because you may have contractual obligations). BI insurance can cover payroll costs during the interruption.

What's your appetite for risk? Some sole traders are comfortable carrying more risk themselves. Others sleep better knowing they're covered. There's no universally right answer — it's a personal and financial judgement.

For many sole traders who work from home on a laptop — consultants, writers, designers, developers — the case for BI insurance is weaker. The risk of being completely unable to work due to property damage is relatively low, and even if your home was damaged, you could probably work from a café, a friend's house, or a co-working space while things are sorted out.

For sole traders with physical premises, stock, or equipment that can't easily be replaced — tradespeople, retailers, manufacturers, therapists with dedicated treatment rooms — the case is much stronger.

How Much Does It Cost?

Business interruption insurance is typically added to your existing business property or contents insurance policy, and the additional premium is usually modest.

As a very rough guide, adding BI cover to an existing policy might cost anywhere from £50 to £300 per year for a typical sole trader, depending on:

• Your industry and risk profile
• The amount of cover (based on your estimated gross profit)
• The indemnity period you choose
• Your location and property type

The premium is, naturally, a deductible business expense. If you're managing your accounts through Accounted, Penny will make sure it's categorised properly alongside your other insurance costs.

Choosing the Right Policy

If you decide business interruption insurance makes sense for your business, here's what to look out for:

Gross profit definition. BI policies define "gross profit" differently from how accountants do. In insurance terms, it typically means revenue minus variable costs — essentially, the portion of your income that covers fixed costs and profit. Make sure you understand the definition in your specific policy, because this determines how much you'll be paid out.

Adequate sum insured. You need to insure the right amount. If you underinsure (declare a lower gross profit than you actually have), any claim will be proportionally reduced — this is called the "average clause." Get your numbers right, and review them annually.

Indemnity period. This is the maximum period the policy will pay out for. Think realistically about how long it might take to get back to normal after a serious incident. Twelve months is common, but for some businesses — particularly those with specialist equipment or long rebuild times — 18 or 24 months might be more appropriate.

Extensions and add-ons. Some policies offer extensions such as:

• Denial of access — Covers you if you can't access your premises because the surrounding area has been cordoned off (e.g., due to a gas leak next door)
• Suppliers' failure — Covers losses if a key supplier is affected by an insured event
• Utilities failure — Covers losses caused by interruption to your power, water, or telecommunications supply
• Disease, murder, and vermin — Covers closures due to notifiable diseases, incidents of violence, or pest infestations at your premises

These extensions can add significant value, particularly if your business is vulnerable to disruptions beyond your direct premises.

Alternatives to Business Interruption Insurance

If you decide BI insurance isn't right for you, there are other ways to mitigate the risk:

Emergency fund. Having three to six months of expenses saved up gives you a financial cushion if you can't trade. This is good practice regardless of whether you have insurance.

Diversified income streams. If all your income depends on one premises, one piece of equipment, or one client, you're more vulnerable. Diversifying reduces the impact of any single disruption.

Business continuity planning. Having a plan for how you'd continue operating if your primary workspace was unavailable — even something simple like "I'd work from the kitchen table and borrow a mate's printer" — can significantly reduce downtime.

Income protection insurance. This is different from BI insurance — it covers your personal income if you're unable to work due to illness or injury, rather than property damage. For sole traders whose main asset is their own ability to work, income protection might actually be more relevant than business interruption cover.

Our sole trader insurance guide covers income protection and other personal insurances that sole traders should consider, alongside the business policies we've discussed here.

Making Your Decision

Here's a simple framework:

1. Calculate your exposure. What would three months of lost income cost you? What fixed costs would continue?
2. Assess your risk. How likely is a serious disruption? How quickly could you recover?
3. Get a quote. The cost might be lower than you expect, especially as an add-on to existing cover.
4. Weigh it up. Is the premium worth the peace of mind and financial protection?

For some sole traders, business interruption insurance is a no-brainer. For others, the money is better spent building an emergency fund. The important thing is to make a conscious decision rather than simply never thinking about it — because by the time you need it, it's too late to buy it.

Related reading:

• Sole Trader Insurance Guide
• Business Insurance Guide for Sole Traders
• Cyber Insurance for Small Businesses — The Growing Need

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Accounted helps UK sole traders stay on top of their bookkeeping and tax. Start your free 30-day trial at getaccounted.co.uk.

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