Which of the following is not usually included in an asset's tax basis?

A. Shipping.

B. All of the choices are included in an asset's tax basis.

C. Installation costs.

D. Purchase price.

E. Sales tax.

Employers often withhold federal income taxes directly from worker's paychecks. When evaluating the tax system, this is an example of which principle in practice?

A. None of the choices are correct.

B. Economy.

C. Certainty.

D. Equity.

E. Convenience.