You pay corporate tax on profits. You're not going to have any recognizable, taxable profits if you're bootstrapping a company that will take VC at some point.
If you are bootstrapping then it is quite likely that you will make a profit [1]. The reason why is that you need to build up capital in the business to provide a buffer for anything going wrong or to take advantage of new opportunities. Trying to run a bootstrapped company on the knife edge of break even is not easy.
1. This is assuming that you have not been lent the capital required to the company.
The company pays taxes on its income, but the salaries are generally deductible from the income that the company is taxed on (as are a whole bunch of other expenses).
1. This is assuming that you have not been lent the capital required to the company.