Percentile Points from 1 to 99 for Total Income Inflation Adjustment Query

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Dear HM Revenue and Customs,

Please can you confirm if the data provided in the published file "Percentile points from 1 to 99 for total income before and after tax" has been "equalised" for inflation (link below)?

I have read all the notes in the spreadsheet and couldn't find anything to suggest it has been so suspect not but please confirm either way.

If it hasn't been adjusted for inflation, please can you provide this if available / possible? Or please can you provide the means / process to do this myself?

Could I use the "Table 8: Consumer Price Index including owner occupiers' housing costs (CPIH) deflator", as found in the "Nowcasting household income in the UK: Financial year ending 2017 - Reference Tables"(link below for reference)?

Yours faithfully,

John Perks on behalf of FOI Central Team, HM Revenue and Customs

Our ref: FOI2017/02447

Dear John Perks,

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HMRC Freedom of Information Act Team on behalf of FOI Central Team, HM Revenue and Customs

1 Attachment

Dear John Perks,

I am writing in response to your request for information, received 17th

Yours sincerely,

HMRC Freedom of Information Team