Mr and Mrs A have 3 children under the age of 16. Mrs A claims the child benefit and receives £24.00 per week for the eldest child and £15.90 each for the second and third child. Mrs A does not work.
Mr A earns £49,000 and has also received a bonus of £5,000.
Total adjusted net income = £54,000
Total child benefit claimed = £1,248.00 for the eldest child and £826.80 for each of the other two children = £2,901.60
Tax charge for child benefit = £54,000 - £50,000 = £4000/100 = 40
40 x 1% = 40% of £2,901.60 = £1,160.64
Mrs A will still receive the child benefit of £2,901.60. However, Mr A will suffer the tax charge of £1,1,60 (the charge rounded down to the nearest whole pound).
Therefore the effective rate of taxation between £50,000 and £54,000 is 67.65% (£270 taxed at 20% plus £3,730 taxed at 40% totals £1,546, add on the £1,160 HICBC means that the tax is effectively £2,706 (which is 67.65% of £4,000))