I'm disappointed you didn't ask me CM? What's wrong - don't you think I know the answer?
Well, you'll be pleased to know that I went through the same fact finding process myself when I did my self assessment about 3 weeks ago.
The calculation to work out the tax credit on the dividends you've already rec'd from your
LTD is:-
Dividends Received x (10/9) x 0.10 = Tax Credit
If you're a basic rate taxpayer, you pay 10% tax on all dividends. You then use the 10% tax credit to offset the tax and bring it down to 0%. So, to summarise, you don't pay any income tax on dividends paid up to the higher rate tax bracket c £40,000.
If some of the dividends you've received fall into the higher rate tax bracket, you effectively pay 25% on them. Which is calculated as:-
Tax Credit = Dividends Received x (10/9) x 0.10
e.g £900 x (10/9) x 0.10 = £100
Add the tax credit to the dividends received = £100 + £900 = £1,000
Tax payable = multiple the £1,000 by 32.5% = £325
Deduct the tax credit from the tax payable = £325 - £100 = £225
So, after the tax credit, you are due to pay £225 income tax on a £900 net dividend (or 25%)!
I Hope this helps, ask me again in future