I think i understand - You are mid-way through the 5 year fixed term contract, and your employer wants to terminate this contract and as compensation has offered you a cash amount.
Provided your contract of employment does NOT state you will receive an enhanced payment then all monies under £30,000 are tax free.
There are two layers of redundancy. First is the statutory amount (law) which is:
• 0.5 week’s pay for each full year of service where age during year less than 22
• 1.0 week’s pay for each full year of service where age during year is 22 or above, but less than 41
• 1.5 weeks’ pay for each full year of service where age during year is 41+
On top of this most good employers will give you an additional amount - this is up to the goodwill of the company.
The question over if you work for an additional 4 months and will lose your redundancy is up to your company.
If you return to work for the same company within 6 months, you will be liable for the tax to the inland revenue on the redundancy payment. Most companies have a policy not to employ someone within a set time from redundancy.
It’s important to understand the difference between tax liability and company policy here. There is no law that says you cannot be re-employed at any time.
If you return to work for the same company with an agency then I think its likely you would also be liable for the tax on your enhanced redundancy payment!
Smala01
p.s. of course you should seek advice from a professional before acting on any information from an open forum such as this :)