Katie59
There are all sorts of allowances given by government to encourage businesses and investors anyone who takes a risk rather than just taking the wages, dividends are one of many.
The concession on £2500 is worth around £300 which won’t cover the extra accountancy costs for companies.
All of us that declare tax legally wether personal or company take advantage of dozens of allowances that the government has decided they want to give to encourage enterprise. You conveniently ignore the allowances that make up your PAYE code
I really do not know what you are trying to say here, Katie59
You asked about how unearned income was taxed differently. Income from share dividends, shares owned by people who have no connection whatsoever with the business, is unearned income. You get an additional allowance of £2000, on top of your personal allowance, on income from dividends and the income is taxed at 7.5% if you're a basic rate payer and 32% if you pay higher rate.
This has nothing to do with company taxation. Dinahmo was only mentioning it in connection with dividend taken as personal income by a company owner as being more tax effective. Nothing to do with company income.
) that this low rate is to compensate for the the fact that a company has already paid corporation tax on the profits that are being distributed as dividend. I'm not sure how true that is. 
I don't think there's much wrong with that.