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Tax rate calculation with fixed base

Excel formula: Tax rate calculation with fixed base
Generic formula 
=IF(A1<limit,A1*rate,(A1-limit)*rate+fixed)
Explanation 

This example shows how to set up simple formula using the IF function to calculate a tax amount with both fixed and variable components. In the example shown, the formula in C5 is:

=IF(B5<limit,B5*rate,(B5-limit)*rate+fixed)

in a worksheet with the following named ranges: rate = F4, fixed = F5, limit = F6.

The rules of this problem are as follows:

  1. If amount is less than $1000, tax is amount * 20%.
  2. If amount is greater than or equal to $1000, tax is $200 + (amount over 1000) *20%

How this formula works

The core of this formula is a single IF statement that checks the amount in column B against the base limit:

=IF(B5<limit

If TRUE, the formula simply multiplies the amount in B5 by tax rate:

B5*rate

If FALSE, the formula applies the tax rate to the amount over 1000, then adds the fixed amount:

(B5-limit)*rate+fixed)
Author 
Dave Bruns

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