What Is The Percentage From Taxes Taken Off Your Cheques?

In the UK, generally about 11% of gross pay for most people.  National Insurance adds about 11% on top of that, though, so about 22% in total, on average.

Exactly how much tax you pay depends on your personal allowance (the amount you can earn before paying tax).  Everyone gets to earn at least £5305 each tax year (roughly 5 April-4 April) tax free.  If you're over 65 the tax free amount goes up (by a complicated formula), and goes up again for the over 75.

Blind or elderly married get to earn a bit more tax free.

The first £2150 that you earn (above the £5305) is only taxed at 10%.  The next £30k or so is taxed at 22%.  Additional income gets taxed at 40%.

National Insurance is another type of tax on our wages, and is calculated differently.  You pay 11% of your wages above a weekly salary of £97 (£5044).

The tax free allowances and NI contributions change slightly from year to year.

Example worked out for a low income worker:

Suppose gross pay = £200 weekly.
Annual gross = 200*52=£10,400.
Annual NI contribs =52*(200-97)*.11 =£589.16
10,400 - 5035 = £5364
£2150 * .1 = £215 (tax at 10% rate)
5365 - 2150 = 3215, * .22 = £707.3 (tax at 22%) rate.

Annual wage = £10,400 - £589.16 (NI) - £215 (10% tax) - £707.3 (22% tax) = £8888.54.

Your employer works that out for you weekly, so your net weekly take-home is (8888.54/52=£170.93).  Or just under 15% taken off by tax + NI.