Everyone who fills in a long form gets something wrong. The question is what to do about it, and the answer is much less dramatic than the anxiety around it suggests.
What counts as getting it wrong?
Three different things, and they have different consequences.
A transcription error — a mistyped figure, a wrong date, a misspelled name. Annoying, easily corrected, rarely consequential on its own.
An omission — something you did not mention because you forgot, did not know, or did not think it counted. This is the category that causes problems, and it is also the most common.
A misstatement — something answered incorrectly. Whether that matters depends on whether the fact was material, meaning whether it would have changed the insurer’s decision.
The response to all three is the same, which simplifies things considerably: tell the insurer, in writing, as soon as you notice.
What if the policy has not been issued yet?
Then this is routine and costs you nothing but a short delay.
Underwriting is still in progress. A correction gets folded into an assessment that has not concluded. The terms may change, or they may not. Nobody treats it as suspicious — corrections during underwriting are ordinary.
This is by far the cheapest moment to fix anything, which is a good argument for re-reading the summary before you submit rather than after.
What if the policy is already in force?
Write to the insurer anyway. A voluntary correction is treated very differently from a discovery.
The insurer will reassess. Possible outcomes include no change, a revised premium, an added exclusion, or in rare cases a reconsideration of the policy. Any of those is preferable to the alternative, which is the same fact emerging when a claim is made.
Keep the correspondence. If there is ever a question later, a dated letter showing you volunteered the correction is the single most useful document you could have.
What genuinely happens if it is only found at claim?
The insurer examines whether the fact was material, and it has to put its reasoning in writing.
Where a policy is questioned on grounds of misstatement or suppression rather than fraud, the insurer must show the fact was material and must communicate its decision with reasons. That is a real protection. It is not the same as the claim being paid, but it means a repudiation has to be justified rather than asserted.
If the decision seems wrong, there is a route: the insurer’s own grievance process first, then the Insurance Ombudsman — independent, free to the complainant, no lawyer required, and its awards bind the insurer.
Is there a point at which this stops being a risk?
Yes. Three years, from the later of four dates.
The clock runs from whichever is latest of policy issuance, commencement of risk, revival of a lapsed policy, or the addition of a rider. Two of those catch people out: reviving a lapsed policy restarts the window, and so does adding a rider.
So a policy taken out eight years ago but revived last year is contestable from the revival, not the original purchase. Worth knowing if you have ever let a policy lapse and brought it back.
What is the practical advice?
Re-read before you submit, correct in writing, and keep copies.
The whole risk here comes from a gap between what the insurer believes and what is true. Anything that narrows that gap — a correction, a fuller answer, a supporting document — makes the policy more likely to pay when it is needed, which is the only thing it exists to do.