How the trade-off works
Every pound of salary is deductible against Corporation Tax, so it saves 19%–26.5% at the company. But salary above £5,000 triggers 15% employer National Insurance, and above £12,570 it triggers employee NI and income tax too. The best salary is the point where the Corporation Tax relief still beats those costs.
£12,570 usually wins — but not always by much
Then take the rest as dividends
Whatever profit is left after salary and Corporation Tax comes out as dividends, which carry no National Insurance and lower headline rates. The dividend tax calculator shows the personal-tax side of that split in detail.