Wanting to undrestand income tax more

axiom

always wanted to understand fully how it works .... going roughly on what I earned last year this is what I make of it ....

(for 2010)

Earned overall : 12,000 Eur

Tax at 20% would be : 2400 Eur

Tax Credits (single) = 1,830 Eur

so essentially I should have earned 11,430 Euro and paid 570 Euro tax over the year if all my credits were taken into account.

Correct ?

axiom

I'd be also have been entitled to PAYE tax credits too yes ?

which would mean I'd pay no tax, yes ?

namenotavailablE

I'd be also have been entitled to PAYE tax credits too yes ?

which would mean I'd pay no tax, yes ?

Correct on both counts so long as you were an employee rather than a self-employed person.
On annual earnings of €12,000, you would have had zero deductions in 2010 so should have received the full amount of annual pay.

You can download my tax calculator to check such scenarios if you wish-
http://taxcalc.eu/monthlyss