Business & farm

That does not make sense.

 

I just entered a clients 1099 for $4200 Total for Labor and mateial cost

Taxes Due went to $4087.00 

I then added the cost of material expenses to TurboTax under Expenses>Supplies for $1850.00

TurboTax recalculated  to $3685.00 owed

It took $402.00off the amount owed instead of $1850. 

Why am I paying income tax on $1850 of job material costs?