Generally, corporations are required to pay tax just like "real" people. In some tax systems, this can give rise to so-called double taxation, because first the corporation pays tax on the profit, and then when the corporation distributes its profits to its owners, individuals have to include dividends in their income when they complete their personal tax returns, at which point a second layer of income tax is imposed.
The Benefits Calculator does not currently calculate benefit entitlement for students, although we are aiming for this to be included in the future. This is because special rules apply and the results provided will not be accurate if you continue with the calculation. This includes students who are full time or part time, or in further, higher, advanced or non advanced education.