Family member Applying for ILR with tax exemption

Hi there'
I'm a family member of EEA national ( 5 years rout ) going to apply for the ILR soon , the first 2 and half years i've worked for Uk companies and paid my tax normal then i have got a new possation at one of the high commissions in london and as i'm not EU national and not a british National i have recieved a letter from the the HMRC informing me that the earning i recieve afford exemption from the UK tax under section 301 ITEPA 2003 , infact i do paying the National insurance getting payslips and tax return letters from the HMRC .

So could you please advice me Is that ok to applying for the ILR ?

You don't qualify for ILR as this is relevant only to those under the UK Immigration Rules. You will be applying for PR which isn't a visa.

Most importantly as your sponsor, how is your EEA family member exercising their Treaty rights in the UK? Have they been employed during your 5 year qualifying period, or self-sufficient or studying with Comprehensive Sickness Insurance (CSI)

What do you mean by 'tax return letters'?

Thanks a lot for your quick reply really appreciated, i can confirm that my wife exercising her treaty right in uk she working here for more thank 5 years and applying now for her PR , i got that letter from HMRC for my annual tax and how much i should pay !

How can anyone calculate your tax due

You need to explain exactly what tax letters you are receiving from HMRC? Are these requests for you to submit an annual tax return?