You have to adjust for the following items in the pro forma income statement:
- Incremental interest expense for any new debt the acquiror has taken on to finance the acquisition
- Lost interest income from cash used to finance the acquisition
- Revenue synergies
- Cost synergies
- Additional corporate costs such as integration costs
- Incremental amortization of capitalized financing fees
- Incremental depreciation from PP&E write-up
- Incremental amortization from intangible assets write-up
Keep in mind these adjustments are made pre-tax on the income statement, and then a tax rate is applied to see the after-tax effect.