Irish redundancy law contains a provision that can cost you the entire payment if you handle it wrongly — and a protection that makes handling it easier.
The rule
Do not unreasonably refuse suitable alternative work. If you turn it down without trying it, you may lose your redundancy payment.
The four-week trial
You have a four-week trial period in the new role.
That means you can accept the alternative, work it for four weeks, and if it turns out to be unsuitable, your redundancy entitlement is preserved.
Refusing outright without the trial is the risk. Taking the trial is not.
What "suitable" means
It turns on the nature of the work, the location, the terms and how they compare with your previous role. An offer that is materially worse is easier to refuse reasonably.
Leaving before the redundancy date
An employee who has received a Notice of Proposed Dismissal for Redundancy — form RP50 Part A — may decide to leave the employment earlier than the date notified, for instance to take up an offer of alternative employment elsewhere.