Although both deduce and deduct are related to the noun deduction, they mean different things. Deduce means ‘conclude through reasoning’, while deduct means ‘take away’:
What can be deduced from these figures?
From this, Watson, I think we can deduce that the murderer was a man.
Tax will be deducted from your wages automatically.
You can deduct reasonable business expenses from your income for tax purposes.
Accordingly, deduction has two meanings:
A brilliant deduction, Holmes!
Deduction of car expenses is not allowed in your case.
© 2014 Baxter Publishing, Hilversum, The Netherlands