How do you build a pro-forma combined income statement? Which deal-change lines are typical?

Start with buyer and target historical or forecast income statements. Align accounting policies and fiscal periods, then add transaction adjustments: incremental revenue / cost synergies, cost to achieve if included, incremental D&A and amortization from PPA, interest expense on new debt, lost interest income on cash used, share issuance impact below EPS, and tax effects. Remove one-time transaction costs from adjusted run-rate views.