Jiangsu province construction business tax and its additional tax basis and tax rate are as follows:

1, business tax = project income *3%

2. Urban construction tax = business tax *7% (city)

3, education surcharge = business tax *3%

4. Education surcharge = business tax * 1%

The project income = project cost+tax+reasonable profit.

Therefore, according to the project cost, the calculation formula is:

Tax rate = {1[1-3% * (1+7%+3%+1%)]-1} *100% ≈ 3.445%.

Supplementary answer to the question: every engineering cost engineer knows.