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Calculating income tax in Excel

Posted on 2011-02-16
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Hi,

Cell A1 has a mothly salary figure before tax. Cell A2 should have the payable tax calculated that should be paid from that salary using the following rules:

Income per annum up to 14000 taxed at 10,5%
Income per annum between 14001 to 48000 17,5%
Income per annum between 48001 to 70000 30%
Income above 70001 taxed at 33%

The above percentages don't apply for the whole salary, say, if one is in the highest band, but instead, the first 14k are taxed at 10,5%, and the next 33999 are taxed at 17,5% etc until the entire salary of cell A1 is allocated across all tax bands.

See http://www.ird.govt.nz/how-to/taxrates-codes/itaxsalaryandwage-incometaxrates.html for more details

Thank you guys!
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Question by:mpaert
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10 Comments
 
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Expert Comment

by:barry houdini
ID: 34910792
Try this formula

=SUMPRODUCT((A1>{0,14000,48000,70000})+0,A1-{0,14000,48000,70000},{10.5,7,12.5,3}%)

The last array shows the differences between the percentages

See this method described here

see attached example

regards, barry
26826693.xls
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Expert Comment

by:cyberkiwi
ID: 34910796
You forgot to add earner's premium to the tax, since it is also deducted at source
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Expert Comment

by:cyberkiwi
ID: 34910814
Unbelievable Barry, answered brilliantly before I even attempted it.
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Author Comment

by:mpaert
ID: 34910827
Thank you barry, but does this work in Google docs?
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Accepted Solution

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barry houdini earned 2000 total points
ID: 34910927
I thought this was an Excel question!

I haven't checked but it probably doesn't in that form, you might need an array formula. Here's an alternative

=(A1*33-MIN(A1,70000)*3-MIN(A1,48000)*12.5-MIN(A1,14000)*7)/100

regards, barry
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Author Comment

by:mpaert
ID: 34910971
Barry, you're a genius. Could you throw me freebee? What would the formula be if A3 showed how many % A2 is from A1?
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Expert Comment

by:barry houdini
ID: 34910999
Hello mpaert,

I'm not sure what you mean - can you give an example with expected result?

btw this version of the SUMPRODUCT formula (using SUM instead) should work in Googledocs

=ArrayFormula(SUM((A1>{0,14000,48000, 70000 })*(A1-{0,14000,48000,70000})*{10.5,7,12.5,3}))

regards, barry
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Expert Comment

by:cyberkiwi
ID: 34912899
@mpaert just use the formula and divide it by A1 and format the column as percentage

@Barry what he means is if total tax take is 29K from 100K, it is a 29% overall take
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Expert Comment

by:barry houdini
ID: 34920212
D'oh!

Thanks ck, I was a little slow there, somehow I wasn't equating A1 and A2 in mpaert's supplementary question to the original data and formula.....

regards, barry
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Author Closing Comment

by:mpaert
ID: 34929438
Thanks!
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