Business Interruption Insurance, Explained Properly
What does business interruption insurance actually pay for?
Quick answerBusiness interruption insurance restores the profit position your business would have been in if the loss had never happened. It is not your lost revenue. If a fire stops you selling $500,000 of stock, you also didn't have to buy or make that $500,000 of stock, so the real gap in your bank account is the profit you missed, plus the costs that kept running regardless.
Most business owners think about this cover backwards, and it is an easy mistake to make. "If I would have sold $500,000 this year and now I can't trade, surely I'm owed $500,000." That is not how the policy works, and it is not meant to be a windfall. If the sale never happened, the cost of making it never happened either: the materials you didn't buy, the stock you didn't need to restock, the delivery you didn't run. Insurance restores you to where you would have been, not to somewhere better. What it does replace, in full, is the money that would genuinely have hit your bank account (the profit) and the costs that kept arriving whether you traded or not: rent, most wages, loan repayments, insurance itself. Understanding that distinction is what makes the rest of this article make sense, because one of the costliest mistakes businesses make with this cover, covered next, is a direct consequence of not understanding it.
For the plain summary of what to buy and who needs it, see the Consolidated Insurance Brokers guide to business interruption insurance; this article goes into how it's actually worked out.
Why is my "gross profit" figure for insurance different from my accountant's gross profit?
Quick answerAn accountant's gross profit is turnover minus the cost of goods sold. A business interruption policy's gross profit is turnover minus only the specific costs that stop automatically the moment you stop trading. For a business with real labour or overheads in the mix, those two numbers can be very different, and almost always the insurance figure is the larger one.
Here is the trap in one sentence: the more of your costs keep running when you can't trade, the bigger the gap between your accountant's number and the number the policy needs. Rent doesn't stop for most businesses, and whether yours pauses at all depends on your lease. Most wages don't stop, at least not immediately. Loan repayments don't stop. None of those get deducted when your insurance gross profit is calculated, because the whole point of the policy is to keep paying them. Only the costs that genuinely switch off with the tap, things like raw materials you didn't need to buy, sit outside the insured figure.
Picture a suburban clinic or trade business turning over $800,000 a year, with maybe $40,000 in materials and consumables that really would stop if the doors closed, and $350,000 in wages and overheads that would keep landing regardless. An owner glancing at their profit-and-loss statement and declaring the "net profit" line, or even the accounting "gross profit" line, is very likely to land on a figure many hundreds of thousands of dollars short of what the policy is actually testing them against. It is not that the owner did the sum wrong. It is that they answered a different question to the one the policy asked.
That gap matters because the same underinsurance penalty that applies to a building's sum insured applies here (see below). Declare too low a figure and a partial disruption pays out scaled down in proportion; a total shutdown pays only up to the figure you declared, no matter how much higher the real number needed to be. A real Australian business found this out the hard way when a claim ran a full 12 months against a declared figure that was far too low; the full case is on the product page.
The fix is not a cleverer guess. It's having the figure checked against how the policy actually defines it, ideally by someone who reads business interruption wordings for a living, before it goes on the schedule rather than after a claim reveals it was wrong.
What does "indemnity period" actually mean, and why does it matter more than the sum insured?
Quick answerThe indemnity period is the maximum length of time your business interruption policy will keep paying, and it is running two clocks at once: the time to physically rebuild or repair, and the separate, usually longer, time for trade to genuinely recover afterwards. Most policies default to 12 months, which is often only enough for the first clock, not both.
It helps to picture the two clocks separately, because they don't run at the same speed and they don't start and stop together.
Clock one: getting the doors open again. This is the part people picture: assessors, contractors, council approvals, materials, a rebuild or a re-fit. It's genuinely unpredictable and has stretched in recent years as approvals, contractor availability and materials all move slower than they used to.
Clock two: getting trade back to where it was. This clock doesn't start ticking down until clock one finishes, and it is the one businesses consistently underestimate. Reopening is not the same as recovering. Regular customers found somewhere else while you were closed. Staff who left during the closure haven't all come back. Word that you're trading again takes time to spread, especially if a competitor picked up your customers during the gap. Every week of that slow climb is a week your indemnity period is still being used up, whether or not the building itself is finished.
Because clock two only starts once clock one ends, the total time you need cover for is the sum of both, not the length of whichever one people happen to think about when they buy the policy. A twelve-month indemnity period can be entirely consumed by a five-month physical closure if the business needed the other seven months to get trade back to normal, and once the indemnity period runs out, it runs out regardless of whether the business has actually recovered.
This is not a hypothetical. In a matter that went to the Australian Financial Complaints Authority, a business was repeatedly sabotaged over several weeks, its systems locked out and key equipment disabled. The insurer accepted the damage to the equipment itself but disputed that business interruption cover had been triggered at all, offering a fraction of what was claimed. AFCA found the cover was triggered and ordered a proper assessment of how long the loss genuinely ran for, rather than accepting either side's starting position. By then the business had already been sold, well over a year after the sabotage began and long before the dispute was decided. The detail worth taking from it isn't the sabotage, it's that the length of time the loss should be measured over was itself the argument, which is exactly the number a badly chosen indemnity period can't fix after the fact.
We have watched the clock run out on our own files too. In a loss of rent claim we handled, a landlord's premises could not be re-let for around 18 months, and the cover paid about $8,000 a month until its limit was exhausted, roughly a week before a tenant was finally signed. Loss of rent is the landlord's sibling of this cover, and the full story of that claim, and of another that went the other way, lives in the commercial landlord's insurance guide.
This is why Consolidated Insurance Brokers doesn't treat the indemnity period as a box on a form. Our default in practice is 18 months, we actively recommend 24 months wherever we can, because the step up from 12 to 18 rarely moves the premium much, and we only use the 12-month floor where a client won't pay for more or specifically instructs us to. The final period is always the client's call. Our job is making sure it's an informed one, set against how long recovery would genuinely take for that specific business, not the number that happened to be the cheapest box to tick. For the buying decision itself, see business interruption insurance.
Why would spending money to reopen faster ever cost me money?
Quick answerA standard policy will only refund extra costs you spend to keep trading, such as temporary premises or hired equipment, up to the amount those costs actually save the insurer. Spend more than that and the difference comes out of your own pocket, unless your policy carries the extension that removes the ceiling, usually called Additional Increased Cost of Working.
The logic makes sense once you see it from the insurer's side. If spending $40,000 on temporary premises stops you losing $60,000 in profit, that's a good trade for everyone, and a standard policy pays the full $40,000 because it saved more than it cost. The insurer is, in effect, splitting the benefit of you trying to minimise the loss.
The trap is the other direction. Say that same $40,000 spend only reduces the loss from $100,000 down to $85,000, a genuine $15,000 saving, but nowhere near what you spent. Under the standard version of this cover, you're reimbursed the $15,000 it saved, not the $40,000 you spent, and you're $25,000 worse off for having tried to get back on your feet quickly. That's not a hypothetical insurers dreamed up to catch people out; it's simply how a cover built to reward cost-effective mitigation behaves when the spending itself turns out to be uneconomic, even if it was the right call for the business.
The extension that fixes this removes the ceiling. It can reimburse the full reasonable cost of getting back to trading, even where that cost is higher than the loss it avoided, provided the spending was itself reasonable and stays within its own limit. It exists precisely because "spend less than you'd lose" is not always a real option: sometimes the only temporary premises available cost more than the trade they protect, and a business shouldn't be penalised for taking the only option on the table.
This is why the extension is worth checking for by name, not assuming it's automatically part of a "business interruption" policy. See the plain summary on business interruption insurance for what a properly built policy includes.
Is business interruption insurance the same as loss of rent cover for landlords?
Quick answerNo. Business interruption protects a trading business's lost profit; loss of rent protects a landlord's lost rental income. If your only connection to a commercial building is collecting rent from it, this article isn't about your cover, loss of rent is, and it runs on the same two-clock indemnity-period logic described above.
The two covers are close cousins, not the same policy under a different name. A tenant running a business needs business interruption. A landlord collecting rent from that tenant needs loss of rent. If you're an owner-occupier, trading a business from a building you also own, you may genuinely need both, often through two different entities, which is its own conversation (see owner-occupier insurance). For the landlord side, including how the indemnity period applies to rental income specifically, see the commercial landlord's insurance guide and commercial landlord insurance.
Does the underinsurance penalty apply to a declared profit figure the same way it applies to a building?
Quick answerYes, and the same partial-versus-total distinction applies. On a partial disruption, declaring too low a profit figure gets your payout scaled down in proportion. On a total shutdown, you're paid up to the figure you declared and no further, even if the real loss was higher.
It's the same mechanism, applied to a different number. A building's sum insured and a business's declared gross profit are both tested the same way: insure for less than the policy requires and a partial claim gets reduced in proportion, while a total loss simply caps your payout at whatever figure you chose, regardless of what the real loss turned out to be. The worked maths, including a real Australian case where a declared profit figure fell far short of what the policy required and the gap only showed up at claim time, lives in The Co-Insurance Clause: What Every Building Owner Must Know; this article won't repeat it. The takeaway that belongs here is simpler: the fix for a building's sum insured (get it properly assessed rather than guessed) is exactly the fix for a declared profit figure too. Guessing is what the clause tests you against, on both.
FAQ
How is business interruption insurance actually calculated?
It starts from your insurance-defined gross profit (turnover, adjusted for stock movement, minus only the costs that stop automatically when you can't trade), then adds back the fixed costs that keep running and any reasonable extra costs of getting back to trading sooner. The result is multiplied out over however much of your indemnity period the disruption actually uses. Get the declared figure or the period wrong and the calculation is accurate, just accurate to the wrong inputs.
What is an indemnity period in business interruption insurance?
The indemnity period is the maximum length of time the policy will keep paying after an insured event, covering both the time to physically reopen and the separate time for trade to recover afterwards. It is not automatically as long as the disruption itself; if the period runs out before recovery is complete, the payments stop regardless of whether the business has genuinely returned to normal.
What's the difference between Increased Cost of Working and Additional Increased Cost of Working?
Increased Cost of Working reimburses extra costs you spend to keep trading, but only up to the amount those costs actually save the insurer. Additional Increased Cost of Working is the extension that removes that ceiling, reimbursing the full reasonable cost of getting back to trading even where it's more than the loss it avoided.
Why does a business interruption policy use "gross profit" instead of my revenue or my net profit?
Because the policy is restoring the profit position you would have been in, not replacing every dollar of sales you missed. Costs that would have been spent to make those sales (materials, stock) never happened either, so paying full revenue would over-compensate. Net profit, on the other hand, strips out costs like rent and wages that the policy is specifically designed to keep paying, so it understates what's needed.
If my business interruption cover runs out before I've fully recovered, is there anything I can do?
Once the indemnity period ends, the policy stops paying regardless of how trade is actually going, so there's no retrospective extension after the event. The only real lever is choosing a longer period before you need it. If you're partway through a claim and worried the period will run out, raise it with your broker early, because reviewing the recovery trajectory partway through can at least confirm whether the period chosen was realistic for next time. We have seen a policy's limit run out just before recovery arrived; that story is in the commercial landlord's insurance guide.
Related reading
- Business interruption insurance: the product page: what to buy, who needs it, and the request-a-callback CTA.
- The Co-Insurance Clause: What Every Building Owner Must Know: the worked partial-vs-total maths this article deliberately doesn't repeat.
- Underinsurance in commercial buildings: the building-side version of the same underinsurance narrative.
- Commercial landlord insurance: loss of rent, the landlord's equivalent cover.
- For business owner tenants, for business owner-occupiers, for commercial property owners: audience hubs.
- Why use an insurance broker: why a declared figure and a period chosen with a broker beats one typed into an online form.