It really depends on how you define the bottom line and what kind of company you're referring to. An LLC or S-Corp? These companies pass through their bottom line to the owners as K-1 income. Most small businesses are in this category and the owners attempt to decrease their tax obligation by REDUCING their taxable bottom line by any means necessary. Tax rates on individual income too high and there's too much potential taxable profit this year? Take advantage of the IRS allowing companies to fully expense some capital expenditures. Push some sales into the following tax year. Submit some anticipated reimbursable expenses in the current tax year.
Notice how I didn't mention employment in there at all? That's because (for most companies) employees are a cost of sales. Meaning that it's a variable expense that when increased, increases revenue, and when decreased, decreases revenue. Tax rates don't enter into decisions on hiring for these types of companies....merely demand for their products. Of course, certain tax breaks will stimulate hiring, but no company says "I know it's really busy and we can't meet demand with our current workforce.....but I can't hire people because income tax rates are too high". If hiring people will increase revenue by more than the cost of employees, they do it.
Now, if we're talking about a capacity issue in a production facility require a new building, that comes down to local tax credits or incentives....not federal taxes. In fact, if adding a new building (and employees) will increase revenue, companies will always pursue that avenue regardless of income tax rates.....because the depreciation (or increased lease payments) will reduce their tax liability (assuming the growth will increase EBITDA....otherwise the growth wouldn't make sense).