Redundancy is governed by QRs and you will find details there, but in a nutshell, and assuming that a change of QRs has not been hurried through to make it affordable, the maximum payout is 18 months basic pay tax free if you have five or more years to serve. There is a sliding scale if you have less than 5 years to go and you may not have to complete 16 years to be eligible for an immediate pension, but you will have to wait for the detials if/when they are published. (The statutory minimum is one weeks pay for every year served). On top of your redundancy you would be entitled to your pension and gratuity if you have completed 16 years. The gratuity is currently untaxed, but the pension counts as income.
Under the QR scheme and by way of example, a level 5 Sqn Ldr with 20 years service at redundancy would get:
Pension: £14952
Gratuity: £44856
Redundancy Pay Off:£66133
Thus tax free lump sum = £110989 + Pension.
You can also commute some of the pension for more cash under the resettlement commutation scheme which could raise another £25065 at cost to the pension; however take advice before you consider the option as it can be an expensive way to raise money in the long term.
HEALTH WARNING - I wouldn't be surprised if the scheme in QRs gets amended at short notice to make it affordable, but in the worst case you cannot be given less than the statutaory minimum of a weeks pay per year of service and your pension is sacrosanct.
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