Getting your sums insured right is one of the most consequential decisions you make when taking out or renewing a commercial insurance policy. Set them too low and a claim may leave you significantly out of pocket. Set them too high and you pay more in premiums than necessary. This guide explains exactly how to calculate your business insurance stock value, equipment worth, and contents figures β so UK SMEs can insure accurately, avoid underinsurance, and approach renewal with confidence.
Why Getting Your Sum Insured Wrong Is So Costly
When you declare a sum insured on a commercial insurance policy, you are telling your insurer the maximum value they may need to pay out. If that figure is materially lower than the actual value of what you are insuring, you are underinsured.
Most commercial policies include an average clause (sometimes called a co-insurance condition). This means that if your declared sum insured is, say, 60% of the actual value, the insurer will only pay 60% of any valid claim β not the full loss. On a Β£50,000 claim, that could leave a Β£20,000 shortfall that you absorb entirely.
Underinsurance is not a fringe issue. It affects businesses across every sector, including retail, hospitality, manufacturing, and professional services β often because owners either rely on outdated figures or simply estimate without a formal valuation process.
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Understanding What Needs to Be Valued
Before calculating figures, it helps to be precise about what each category of cover actually includes.
Stock
Stock refers to goods you hold for resale, raw materials used in production, and work in progress. For most product-based businesses, stock is the largest variable on a policy.
Trade Contents and Fixtures
These are the physical items inside your premises that you use to operate β shelving, counters, display units, fitted furniture, and dΓ©cor. Importantly, fixtures that are permanently attached to the building may be covered under buildings insurance rather than contents, so clarify this boundary with your insurer.
Business Equipment and Machinery
This covers the tools, devices, and machinery your team uses β from laptop computers and POS terminals to industrial presses and refrigeration units. High-value equipment may need to be individually specified on the policy.
Portable and Off-site Equipment
If your staff take laptops, cameras, tools, or other equipment off-site, this may need a separate section of cover or an all-risks endorsement. Standard contents policies typically only cover items on your premises.
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How to Calculate Your Business Insurance Stock Value
Stock valuation for insurance purposes should reflect replacement cost β the amount it would cost you to repurchase the same stock at today's wholesale or trade prices, not what you paid originally, and not what you would sell it for.
Step 1: Establish Your Peak Stock Level
Stock value fluctuates throughout the year. A garden centre holds far more stock in spring than in January. A gift retailer peaks before Christmas. For insurance purposes, you need to declare the maximum value you hold at any point in the year β not an average.
Review your stock purchase records, stock-take reports, and inventory software for the past 12 months. Identify the peak month and use that figure as your starting point.
Step 2: Apply Current Replacement Costs
Costs change. If your suppliers have increased wholesale prices since your last stock-take, your replacement cost will be higher than your historic purchase price. Contact your main suppliers for current price lists, or use recent invoices as your benchmark. Do not simply carry forward last year's figure without checking.
Step 3: Include Work in Progress
If you manufacture or assemble products, include partially completed items at cost β materials plus labour already invested. This is easy to overlook and can represent significant value for production businesses.
Step 4: Exclude VAT Carefully
VAT-registered businesses can generally reclaim VAT on stock purchases, so stock should typically be insured at the net (ex-VAT) replacement cost. If you are not VAT-registered, insure at the gross cost. Confirm the correct basis with your insurer or broker, as this varies by policy structure.
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How to Value Equipment, Machinery, and Business Contents
Unlike stock, which is consumed and replenished, equipment tends to be held for longer periods β which is precisely why its insured value often drifts furthest from reality.
New-for-Old vs. Indemnity Basis
Most commercial contents policies are written on a new-for-old or reinstatement basis, meaning the insurer will pay to replace the item with a new equivalent rather than applying depreciation. This is generally preferable for businesses, but confirm it applies to your policy.
Some policies, particularly cheaper ones, are written on an indemnity basis, where a deduction is made for wear and tear. On a five-year-old piece of machinery, that deduction can be substantial.
Building an Asset Register
An asset register is a structured record of everything your business owns that has insurable value. At minimum, it should include:
- Item description and model or serial number
- Date of purchase
- Purchase price (and current replacement cost if significantly different)
- Location (on-site, off-site, or at a specific premises)
- Any recent servicing or upgrade that affects value
A spreadsheet is sufficient for most SMEs. Update it whenever you acquire, dispose of, or significantly modify an item.
Specialist and High-Value Items
Some equipment β CNC machinery, commercial catering units, medical devices, photographic equipment, or specialist IT infrastructure β may require a professional valuation to insure correctly. Insurers may also request evidence of value for items above a certain threshold, which varies by policy.
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Comparison: Common Valuation Mistakes and the Correct Approach
| Mistake | Why It Causes Problems | Correct Approach |
|---|---|---|
| Using selling price for stock | Overstates or understates replacement cost; selling price includes margin | Use wholesale or trade replacement cost |
| Using book (depreciated) value for equipment | Understates reinstatement value on new-for-old policies | Use current new-equivalent replacement cost |
| Insuring average stock, not peak stock | A major loss at peak season leaves a large shortfall | Declare the maximum stock level held at any point |
| Forgetting off-site or portable equipment | Items not listed are typically excluded | Inventory all portable equipment and clarify cover scope |
| Carrying forward last year's sum insured | Supplier price changes and acquisitions alter actual value | Review and recalculate at each renewal |
| Including VAT for VAT-registered businesses | Inflates the declared value; VAT is reclaimable | Insure at net replacement cost if VAT-registered |
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UK-Specific Evidence to Gather Before Renewal
A well-prepared SME will bring the following documentation to their renewal discussion. Having this information ready also reduces delays if you need to make a claim.
For stock:
- Most recent stock-take report with a date
- Supplier invoices from the last three to six months showing current prices
- Inventory management system export, if applicable
- Any seasonal variation notes (for example, a Christmas trading peak)
For equipment and contents:
- Asset register or fixed asset schedule from your accounts
- Purchase invoices or receipts for significant items
- Quotes or online research confirming current replacement costs for key items
- Lease or hire-purchase agreements for items you do not own outright (note: you may not need to insure items the finance provider insures separately)
For specialist items:
- Professional valuations, particularly for equipment over three to five years old
- Manufacturer or dealer quotes for new equivalents
If your business has changed significantly since your last renewal β new premises, additional staff, expanded product lines, major equipment purchases β you should not wait until renewal to revisit your cover. Speak to your insurer or broker as soon as a material change occurs.
For a broader overview of what commercial cover is available to UK SMEs, see Aarubi's commercial insurance section.
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How Inflation Affects Your Sums Insured in 2026
Supply chain pressures and cost inflation have affected replacement values across many sectors over recent years. In 2026, businesses that have not reviewed their sums insured since 2023 or 2024 may find that their declared values are materially behind current replacement costs.
This is particularly relevant for:
- Hospitality and food businesses, where commercial kitchen equipment costs have increased significantly
- Retailers with imported stock, where currency movements and logistics costs have shifted replacement prices
- Technology-dependent businesses, where component shortages and new hardware generations affect replacement costs
Some insurers offer index-linking on sums insured β an automatic uplift applied at renewal to track inflation. This is a useful starting point but is not a substitute for a proper annual review, as index-linking applies a general multiplier rather than reflecting your specific stock mix or equipment profile.
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Action Checklist
- Identify your peak stock period and use that value β not an annual average β as your declared stock sum insured.
- Recalculate stock at current replacement cost, using recent supplier invoices rather than historic purchase prices.
- Build or update an asset register listing all equipment, tools, and contents with current replacement values.
- Clarify the policy basis β confirm whether your contents cover operates on a new-for-old (reinstatement) or indemnity basis.
- Separate fixtures from contents and confirm with your insurer which items fall under buildings cover versus contents cover.
- Identify any off-site or portable equipment and check whether it is included within the policy or requires a separate all-risks section.
- Remove VAT from declared values if your business is VAT-registered and you are insuring items you can reclaim VAT on.
- Obtain professional valuations for specialist or high-value items where your own estimate may be difficult to justify at claim stage.
- Set a calendar reminder to review sums insured at least 60 days before your renewal date each year.
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