There is no way that a corporation will absorb these costs.

Corporations selling to consumers may increase prices at groceries, utilities, department and home improvement stores, car dealers, etc. Nothing stopping any of them from adding a 2.5% surcharge on all purchases to cover the tax, or burying the cost with increased prices.

Suppliers to small businesses in Oregon will pass this tax on at each level of the supply chain. This will multiply the effective tax, hurting the smallest businesses the most, and the largest ones the least.

There are several hundred small businesses lending their support. Each  may want to talk to their tax accountants and suppliers to better understand how this tax might indirectly affect their costs, even if they are well below $25M in Oregon sales.

This 2.5% tax surcharge is in addition to any state income tax already due.

The measure implies that this money will go to education, healthcare, and senior services. It all goes to the general fund.