American Innovation Act of 2020 This bill revises the tax treatment of business start-up or organizational expenditures. Specifically, it allows an election to deduct such expenditures in an amount equal to the lesser of the aggregate amount of such expenditures incurred by an active trade of business or $20,000, reduced by the amount by which such aggregate amount exceeds $120,000. The remaining amount of such expenditures shall be amortized over the 180 month period after the trade or business begins. The bill also revises the tax treatment of partnership syndication fees and start-up net operating losses and tax credits after an ownership change.