Companies don't sponsor college. They may sponsor only MBA in 2 ways:
- You get the sponsorship for the tuition and some living expenses. After MBA you have to come back for 2 years. Or you have to repay the loan (terms are not that bad btw)
- You didn't take the sponsorship and paid yourself but you decided to get back. In that case, the company will reimburse you what you've paid. The option is not available across all the countries and all offices. The option may work as well if you are making a transfer to a different country.
The 2nd option is in general better since you get a significant fellowship as a non-sponsored student (up to 70% of tuition across Harvard and Stanford. up to 90% in Harvard starting from this year). For Big3 firms, it's also better since they reimburse the discounted amount. And you are always free to switch to a different company during MBA.
If you just join MBB the first time after MBA you get a sign-on bonus of 30-50k