Tax Analysing the impact of increasing the personal tax allowance to £10,500 in 2015 18 March 2014 Alex Hurrell A comparison of the effects of spending the same sum of money on two alternative tax reforms that are also being aired in the run-up to the Budget – raising the threshold at which workers have to pay NICs, and raising the higher rate tax thresholds so that fewer people get dragged into the 40 pence rate.