Add all your taxable income for the year minus all your allowable deductions, then apply that income to the tax tables.
2016 tax tables might be different, so you wont be accurate.
And even when you receive the redundancy payment, will you be working a new job for more income?
The hard answer is, unless you know what income and duductions are going to be in 2 years, you are just not going to be able to work it out at the click of a finger.
pinkboy