Why Income over £100,000 Is Hit Hardest
Your Personal Allowance is the £12,570 you can earn each year before you pay Income Tax. Once your adjusted net income goes above £100,000, you lose £1 of that allowance for every £2 over the limit. By £125,140, it has gone completely.
Adjusted net income is broadly your total taxable income, including trading profits, rent and savings interest, minus certain reliefs such as pension contributions and Gift Aid donations. Because you lose the allowance as your income rises, income in this band is effectively taxed at 60% today. Reports suggest this could reach 64% on savings interest under the new rate.
Ways to Bring Your Income Below the Threshold
Paying more into a personal pension reduces your adjusted net income, which can win back some or all of your allowance. Gift Aid donations work in a similar way. It's worth knowing how backdating Gift Aid donations works on your Self Assessment return.
If you're self-employed, your profits for the year largely decide whether you cross the threshold. Keeping your records up to date through the year shows you early if you're getting close to £100,000, while you still have time to act.