My First Flip

[Connie Ly]

Hello everyone. I am doing my first flip and confused with the taxes. My general contractor said he will be my sub contractor and be able to get all work done with his professionals. I have questions:

1) a sub contractor isn't the same as a general contractor is it? He also said I do not have to pay taxes now if I issue him a W-9? How does this work? 

2) Do I pay for taxes for the services rendered now or later come tax time? If I pay taxes now and I have to pay for excise taxes when I sell... seems like a lot of taxes?

Sorry to be so naive! Thank you!