Both middle and high income brackets will be hit by massive tax increases this decade

Impact of permanent tax and benefits changes announced this Parliament by 2027-8, broken down by poorest (1) to richest (20) income bracket (£)

'NI' is National Insurance; 'UC' is Universal Credit. Other tax measures include capital gains tax changes, dividend allowance threshold changes, and additional income tax threshold changes.
Source: Resolution Foundation
New Statesman