So there are some actual details of Indianas financial commitment coming out. A lot of amendments to original bill got pushed through, so there may be some things I need to update, but from what I can tell:
https://www.wishtv.com/news/chicago-bears-stadium-taxes-indiana/
I believe only the food/bev, hotel, and ticket taxes can directly back the bonds. Per the high end estimates from that article, that would be $35M annually, which would equate to about $500M in bond borrowing capacity. Indiana House speaker said Bears have pledged $2B. So anything over $2.5B is coming from Bears lease payments or from refinancing over time. Any tax over that $35M estimate would effectively reduce the Bears lease payments though.
Since I don't think tolls or income tax can back bonds per the bill language I'm assuming tolls will pay for any add-on infrastructure that isn't part of the immediate site "capital improvements". I'd guess the local income tax is a replacement to property tax. Not sure what the rate is, but likely makes IL more competetive given Lake County IN is only 0.45% lower today. Of course that's mostly players problem, so Bears won't care much.
Its both a shakedown of residents, and not all *that much* money in stadium terms. Bears will still pick up a big bill. And a 12% ticket tax is definitely an indirect tax on Bears revenue, in a already less desirable location that might not be able to justify the ticket prices AH could demand.