If Labor’s proposed tax changes had been in place for the past 25 years, top earners would have lost tax breaks worth hundreds of thousands, according to Treasury secretary Jenny Wilkinson.

Labor’s pre-election promise of a $1,000 standard tax deduction and $250 ‘working Australians tax offset’ will be included in the draft laws

But the top 1 per cent of income earners would lose about $400,000 worth of tax concessions over their lifetime, Treasury secretary Jenny Wilkinson revealed on Thursday.