Please bear with me on this query. For 2016/17 the savings allowance is £1,000 for standard rate taxpayers and £500 for higher rate taxpayers. Higher rate for this purpose seems to be where total (taxable) income is £43,001 or above even though none of the income may be taxed at 40% due to say the dividend allowance. This means that someone with a total income of £43,001 will pay £100.20 more than someone earning £43,000 (a marginal tax rate on the £1 of 10,000%).
Although I've doctored the figures slightly from a client's tax return, in essence the figures are actual. Is my software correct or is there something I've overlooked?