A single figure decides both what you pay every year for comprehensive motor insurance and what you would actually receive if your car were ever stolen or completely destroyed, worth understanding exactly how this figure, called the Insured Declared Value, is actually calculated and why setting it correctly genuinely matters.
What IDV Actually Represents
The Insured Declared Value is the maximum amount your insurer would pay in the event of your vehicle's total loss or theft, it's essentially the current market value of your vehicle, calculated using the manufacturer's listed selling price, adjusted for depreciation based on the vehicle's age.
How the Depreciation Schedule Actually Works
Vehicles depreciate on a standard schedule for IDV purposes, roughly 5% for a vehicle up to 6 months old, increasing progressively with age, reaching around 50% depreciation by the time a vehicle is 4-5 years old, this standard schedule is why your IDV, and correspondingly your Own Damage premium, decreases every year as your vehicle ages.
Why a Higher IDV Means a Higher Premium, But Also a Higher Payout
Since your Own Damage premium is calculated as a percentage of your IDV, a higher declared IDV results in a higher premium, but also a higher potential payout in the event of total loss or theft, some owners are tempted to declare a lower IDV specifically to reduce their premium, worth understanding the genuine trade-off this creates before doing so.
The Genuine Risk of Deliberately Under-Declaring Your IDV
Declaring an IDV below your vehicle's genuine current market value does reduce your premium modestly, but it also caps your maximum possible payout at this artificially lowered figure, in the event of a genuine total loss, you'd receive considerably less than your vehicle's actual worth, a real, significant financial risk in exchange for a comparatively modest premium saving.
Can You Negotiate or Adjust Your IDV Within a Reasonable Range?
Most insurers allow you to adjust your IDV within a specific permitted range around the standard depreciation-based calculation, typically within roughly plus or minus a small percentage, worth using this flexibility to set an IDV that genuinely, honestly reflects your vehicle's actual market condition, rather than pushing it toward the lowest end purely to minimise premium.
How IDV Interacts With Return to Invoice Cover
As discussed in our motor insurance add-ons guide, return to invoice cover specifically addresses the gap between your IDV-based payout and your vehicle's original purchase price, worth considering this add-on if you're concerned about IDV's declining value not fully reflecting what you originally paid for a relatively new vehicle.
Why Reviewing Your IDV at Every Renewal Genuinely Matters
Since IDV automatically decreases each year based on the standard depreciation schedule, actively reviewing this figure at each renewal, rather than simply accepting whatever the insurer's system generates, ensures it continues to genuinely, fairly reflect your vehicle's actual condition and value, particularly if you've made specific modifications or maintained the vehicle unusually well.
Does IDV Affect Third-Party-Only Policies?
No, since third-party insurance, as discussed in our third-party versus comprehensive guide, doesn't cover your own vehicle at all, IDV is a concept specific to comprehensive policies and their Own Damage component.
A Practical Way to Approach Your IDV Declaration
- Understand your vehicle's genuine current market value as a reference point
- Set your IDV honestly close to this genuine value, using the insurer's permitted adjustment range if you have specific reason to
- Avoid the temptation to significantly under-declare purely to reduce premium, given the real payout risk this creates
- Review your IDV at every renewal rather than assuming it's automatically correct
Frequently Asked Questions
Does a higher IDV mean my Own Damage claims for partial damage (not total loss) also pay out more?
No, for partial damage claims, the payout is based on the actual repair or replacement cost, subject to your specific policy terms, IDV specifically caps the maximum payout for total loss or theft scenarios.
Can I set my IDV higher than my vehicle's genuine market value to get a bigger payout if it is stolen?
No, insurers generally cap IDV within a reasonable range of the vehicle's actual calculated value, you cannot simply declare an inflated figure to secure a larger potential payout.
Does IDV reset if I renew with a different insurer?
Your IDV is recalculated based on your vehicle's current age and the standard depreciation schedule regardless of which insurer you renew with, it isn't tied specifically to your previous insurer's prior figure.
How is IDV calculated for a vehicle older than 5 years?
For vehicles beyond the standard depreciation schedule's range, IDV is typically determined through mutual agreement between you and the insurer, based on the vehicle's actual condition, worth discussing this directly with your insurer for an older vehicle.
