The how is tax calculated website containing 2012 - 2013 Tax & NI Calculator | Examples -how to calculate 

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2012 - 2013 income tax and NI calculator UK

Tax calculator 2012/13 - Now containing a comparison row; to compare your take home pay with the last tax year

Tax & NI rates for 2012 - 2013

Tax calculator for 2011-2012

Tax calculator for 2010-2011

Welcome to iknowtax.com where you will find Tax and NI calculators containing the latest official rates from the HMRC. It allows you to calculate your net income after tax and see what the taxman is taking.
Above you will find links to the Tax and NI calculators and an easy to understand table showing the rates for 2012 - 2013 and the previous years.

The new national minimum wage is effective from October 2011. New rates are (per hour):

  • £6.08 for 21 years and older (increased by £0.15)
  • £4.98 for 18 - 20 years old (increased by £0.06)
  • £3.68 for under 18 years old (increased by £0.04)
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How is tax calculated? I'm confused?

You have come to the right place! This is the first stop for you to understand about tax rates and how it is calculated. You can learn from scratch here. After reading this page you can then search and ask specific questions on Google about tax. You will know what you're doing!
Understanding and calculating tax can be quite complicated so this website will list you off the ground and get you knowing.

Your tax is calculated after deducting your Personal Allowance. Everyone gets Personal Allowance unless you are earning over £100,000 (which your personal allowance starts to deduct bit by bit until it reaches zero).
Your tax is calculated on your salary (or earning) left after taking away your Personal Allowance amount from your salary, (Personal Allowance is the amount  of your salary where tax is not applied, making anything in that amount a tax free income) (Don't get confused; personal allowance doesn't mean that you get this amount as extra money coming to you, it is the part of your income (salary) where the tax does not apply, which is called Personal Allowance).
Example, your salary is £25,000 per annum, your Personal Allowance is £8105 per year; so £25,000 - £8105 = £16,895. So on £16,895 is amount where the tax will be taken from as a percentage (detailed examples below). Still, more is deducted for your National Insurance Contribution (NIC) if you have not reached the state pension age. The amount for National Insurance is deducted as a percentage on salary above £7592 per year. Look at the tables below.

It's a myth: It is sometimes better to not earn more, by getting a higher paid job or a second job because you will lose out by paying more tax

Personal allowance 2012/13

What is Personal Allowance? Personal Allowance is the portion of your earning where tax is not applied, making that portion of your earning tax free.

Age Condition Personal Allowance (per year)
  If you are earning up to £100000 £8105
Under 65 If you are earning between  £100000 and £116210 Decreases from £8105 by 50% of every pound you earn (above £100000) until it reaches £0
  If you are earning £116210 or more £0
  If you are earning up to £25400 £10500
  If you are earning between £25400 and £30190 Decreases from £10500 by 50% of every pound you earn (above £25400) until it reaches £8105
65 - 74 If you are earning from £30190 to £100000 £8105
  If you are earning between  £100000 and £116210 Decreases from £7475 by 50% of every pound you earn (above £100000) until it reaches £0
  If you are earning £116210 or more £0
  If you are earning up to £25400 £10660
  If you are earning between £25400 and £30510 Decreases from £10660 by 50% of every pound you earn (above £25400) until it reaches £8105
75 and over If you are earning from £30510 to £100000 £8105
  If you are earning between  £100000 and £116210 Decreases from £8105 by 50% of every pound you earn (above £100000) until it reaches £0
  If you are earning £116210 or more £0

This table is rounded up to the nearest pound

If you are blind you get an additional amount on top of your personal allowance of £2100

See example #1

Taxable income/ income tax

Taxable income is your earning where tax can be applied to.
These are some that counts as taxable income: income from employment, self employment/partnership, pension, investment earning, rental property, state benefits. For more information visit: http://www.hmrc.gov.uk/incometax/taxable-income.htm#1.


Tax rates 2012

These rates are used to apply to the different portions of your earning

Your earning [per year after taking away your Personal Allowance amount from your earning] Tax rate 2012 - 2013  that is
Below £0 No tax is taken ---
£0 - £34,370 20% called Basic rate
£34,371 - £150,000 40% called Higher rate
over £150,000 50% called Additional rate


Example: Salary minus Personal Allowance: £35,000 - £8105 = £26,895. So on £26,895, 20% tax rate will apply as you can see on the table above this amount falls between £0 - £34,370.

Example 2: Salary minus Personal Allowance: £50,000 - £8105 = £41,895.
On this amount (£41,895), 20% will be applied to up to £34,370 and on the remaining amount it will be 40%.
Like this: 20% of £34,370 (out of £41,895), and 40% of £7525 (remaining of £41,895 minus £34,370). So the tax paid will be £9884.

Image below illustrates the portion of the salary (£50,000) where the tax rates are applied and deducted
2012 - 2013 tax example graph illustration

See example #4    |    Does Tax or NI come out first?

National Insurance rate 2012

National Insurance Contribution is payable by everyone, until you have reached the state retirement age. Currently the state retirement age for males is 65 years old and females is 60 years old. National Insurance pays for your state pension and other state benefits.

Your earning [per year] National Insurance rate 2012 - 2013   that is
Earnings up to  £7592 0% No National Insurance contribution is payable
Earnings between £7592 and £42,484 12% Salary minus £7592 = X, 12% of X
Earnings £42,484 or more 2% [£42484 minus £7592 = £34892, 12% of £34892] plus Salary minus £42484 = X, 2% of X

These rates are used to apply to the different portions of your earning.

Below is the above table presented in a different way (it makes it a little easier to see how to apply NI rates on your earning) :

Your earning [per year, after subtracting £7592] National Insurance rate 2012 - 2013   that is
Below £0 0% No National Insurance contribution is payable
Between £0 and £34,893 12% Salary minus £7591 = X, 12% of X
Between £34,893 or more 2% [£42484 minus £7592 = £34892, 12% of £34892] plus Salary minus £42484 = X, 2% of X

How to calculate tax?

Here are examples of how Tax and NI is calculated, so you can work out your take home/net pay:

These examples are based on the 2011 rates. These examples are currently being updated to 2012.

#01 If I earn £3000 per year, how is tax and NI calculated:
You are under 65 years so you will get personal allowance of £7475.
Because your salary is below the Personal Allowance amount, you will not pay tax:
Salary minus Personal Allowance; £3000 - £7475 = below £0, so there is no amount left to tax on.
You will also not pay any National Insurance contribution because you are earning below £7228.
So you keep exactly £3000.

#02 If I earn £10,000 per year, how is tax and NI calculated:
You are under 65 years old so your personal allowance is £7475.
Now to calculate how much tax is due from you, you need to takeaway Personal Allowance amount from your salary (Salary minus Personal Allowance): £10,000 - £7475 = £2525
So £2525 is the amount where tax will be taken from.
The tax rate will be for you is 20% of £2525.
So 20% of £2525 is £505 (£2525 × 0.2 = £505). So the tax due is £505.
Now to see how much money is left for you to take home, you need to also calculate the amount of National Insurance contribution will be taken from you.
Your salary is more than £7228 and less than £42,484 so the National Insurance rate will be 12%.
Any amount below £7228 you don't need to pay National Insurance contribution (NIC).
So to apply the 12% rate you will need to takeaway £7228 from your earning.
That will be £10,000 - £7228 = £2772. £2772 is the mount where the 12% will be applied to deduct the amount for NIC. So 12% of £2772 is £332.64 (£2772 × 0.12 = £332.64).
Now you can work out how much you take home/ your net pay: Salary - Tax - NIC:
£10000 - £505 - £332.64 = £9162.36

#03 If I earn £20,000 per year, how is tax and NI calculated:
You are under 65 years old so you personal allowance will be £7475.
Subtract your Personal Allowance amount from £20000.
£20000 - £7475 = £12525
Now on £12,525 is where the tax will be deducted from. 20% tax rate will apply.
20% of £12,525 is £2505. So £2505 is deducted for tax.
For National Insurance (NI); Subtract £7228 from £20,000.
That is £12,772. On this amount 12% will be deducted for NI.
12% of £12,772 is £1532.64. For NI £1532.64 is deducted.
Total deduction is £2505 + £1532.64 = £4037.64.
You take home £15,962.36

#03.1 If I earn £30,000 per year, how is tax and NI calculated:
You are under 65 years old so your personal allowance is £7475.
Subtract your personal allowance amount from earning £30,000.
£30000 - £7475 = £22,525
£22,525 is less then £35,000, so 20% tax rate will apply (see the Tax Rates table above).
20% of £22525 is £4505 (£22525 × 0.2 = £4505).
So for tax £4505 is deducted.
For National Insurance; Subtract £7228 from £30,000.
That is £22,772. (£30000 - £7228 = £22772).
£22,772 is below £35,256 (see the NI table above), so 12% will be applied to it.
12% of £22,772 is £2732.64 (£22772 × 0.12 = £2732.64).
For National Insurance £2732.65 is deducted.
Total deduction is £7,237.64 (£4505 + £2732.64).
You take home £22,762.36 (£30000 - £4505 - £2732.64 = £30000), your net pay

#04 If I earn £45,000 per year, how is tax and NI calculated:
You are under 65 years old so your personal allowance is £7475.
Tax rate of 20% and 40% will apply. See the Tax Rates table above.
To calculate how much tax is due from you, you need to takeaway your Personal Allowance amount from your salary: (Salary minus Personal Allowance); £45,000 - £7475 = £37,525.
£37,525 is the amount where tax will be applied to.
Now 20% tax rate is applied to £35,000 out of £37,525.
So 20% of £35,000 is £7000 (£35,000 × 0.2 = £7000).
Now 40% tax rate is applied to the amount over £35,000 (of £37,525), that is £2525 (£37,525 - £35,000 = £2525).
So 40% of £2525 is £1010 (£2525 × 0.4 = £1010).
Total tax due is £8010 (£7000 + £1010).
For National Insurance contribution, 12% rate is applied to salary between £7228 and £42,484 and the 2% rate applies to amount of the money above £42,484.
Earning below £7228 you don't need to pay National Insurance contribution. So the the 12% rate will apply to between £7228 and £42,484 of your earning. And 2% above £42,484.
So, 12% of (£42,484 - £7228 = £35,256); 12% of £35,256 is £4230.72.
The 2% rate applies to your earning from £42,484 to £45,000. 2% of (45,000 - 42,484); 2% of £2516 = £50.32.
For National insurance contribution £4281.04 (£4230.72 + £50.32) is deducted from your earning.
Finally you can work out how much you take home: Salary - Tax - NIC:
£45000 - £8010 - £4281.04 = £32708.96

Was this easy to understand and useful? Did you find anything confusing? Got any questions about iknowtax.com? Please let me know by emailing me admin@iknowtax.com or comment below freely or on iknowtax.com facebook page!

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Comments

1 2 3 > [last]
Carl says...
Hello,

I have recently started a new business as a sole trader. At the end of the year, when calculating Income tax/NI contribution etc do I add up all my income and deduct the expenses (such as payments to suppliers) before before calculating tax?

Or are expenses taken out after tax has been deducted?

Any help is greatly appreciated.

4th May 2012 11:16pm
mark says...
Hi!
I shall be 60 in a few months and will start to receive small pension below the tax threshold but will also be receiving a wage from my partime job, again below the tax theshold. The two combined will take me over the limit. Will i pay tax on both , none or one.? .
4th May 2012 10:18am
Anonymous says...
Hiya. i have the net amount from self employed income from having tax deducted at source at 20%.I am a construction worker. I need to know what my gross was and i dont understand the equation to work it out. Could you help me please?
2nd May 2012 9:30pm
admin@iknowtax.com says...
Hi, Your workplace must supply you with a payslip giving you a breakdown. You need to speak to your boss. You have the right to have a detailed breakdown of your pay (Salary, tax deduction, NI deduction and net pay).

This formula will work out your salary (if your income tax deducted pay is between £8105 and £35601 annually and under 65 years old):

x - ((x - 8105) * 0.2) = [Your Net Pay]

Where it says \'Your Net Pay\' - here you will enter your tax deducted pay you received converted to a yearly net pay (If you get your pay weekly multiply it by 52, if paid monthly multiply by 12... etc).

BUT - this may not be accurate if your employer also deducted your National Insurance contribution before paying you.

I will see if I can create a full formula later.

I am unable to give a clear simple answer now. When I do I will post it here
3rd May 2012 11:43pm
Henri C says...
I have been racking my brains as to how to arrive at the Tax due. This made it so simply
Thanks
1st May 2012 11:52am
Mary says...
Lovely, easy to understand although in the examples we need to update the personal allowance figures.
Good work!!
26th April 2012 2:14pm
rictay says...
Very helpful site, put my mind at rest, good job!
25th April 2012 6:22pm
Pete says...
Really good tool, very easy to follow. I however have two part time jobs with different wages etc, is there anything different in this case? I'm still earning less than 34,000 but just assuming my tax and N.I. is the same on the combined earnings?)
25th April 2012 12:38pm
Anonymous says...
I am 17, working a full time job that earns me over 10,000 a year. Is there any different rules on tax because of my age?
19th March 2012 6:11pm
Nafeesa says...
Thanks this information was very very useful for clueless me!.... Thank you very much for giving us sum insight... Its good to finally know the basics of tax.
2nd February 2012 12:47am
1 2 3 > [last]
Page 1 of 8  (80 comments)

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Learn and teach yourself how the PAYE Tax and National Insurance (NI) is applied to your salary.
UK Tax year 06 April 2012 to 05 April 2013.

Kash