Guides · The bid process
What is a corrigendum, and why do tender deadlines change?
A corrigendum is a formal amendment the buyer issues to a bid that is already open: a new closing date, a changed specification, a corrected quantity or a revised term. It is binding, it overrides the original document where they conflict, and the last one issued is the version you bid against.
Why they happen
- Bidders asked questions at the pre-bid stage and the answer changes the document.
- Too few bids arrived and the buyer extends the closing date.
- A specification, quantity or delivery term was wrong and is corrected.
- A holiday or a portal outage falls on the closing date.
What to do with one
- Re-read the whole corrigendum, not the headline. A date extension often travels with a changed term.
- Re-check your documents against the amended requirements; a new certificate requirement is easy to miss.
- Update your internal deadline to the new closing time, and keep the original in your notes so the history is clear.
Where iBid.Win helps
The mirror carries corrigendum extensions, so the closing date on a bid page and in a saved-filter alert is the latest one, and imported bids in your workspace follow the extended deadline automatically.
Frequently asked
Can a corrigendum shorten a deadline?
In practice buyers extend rather than shorten, but any change in the corrigendum is binding. Read it in full.
Do I have to re-submit my bid after a corrigendum?
Only if the corrigendum changes something your submission depends on, or the buyer asks. The portal's instructions with the corrigendum say so.
Where are corrigenda published?
On the bid's own page on GeM, alongside the original documents. iBid.Win reflects the resulting date changes.
Last checked 08 September 2026. Written from GeM's published process and this platform's own rules; the bid document and the GeM portal are the authority on any date or amount.