Year-End Tax Guide 2017/18
Personal allowances and reliefs
The personal allowance for the current tax year is £11,500. Non-savings income above the personal allowance is taxed at rates from 20% to 45%.
A higher marginal tax rate may be payable between £100,000 and £123,000 when the personal allowance is gradually withdrawn, giving an effective marginal rate of 60% in this band for non-savings and savings income.
You may be able to transfer £1,150 of your personal allowance to your spouse or civil partner if neither of you is a higher rate taxpayer.
Generally speaking, it is relevant when one spouse or civil partner is not able to use all of their personal allowance.