Tesla's electric semi-truck could become a real profit line, but the case rests heavily on government money rather than the truck itself.

• The federal $40,000 tax credit for electric semis ended in September 2025, removing a big chunk of support.
• California still pays out huge incentives through its HVIP voucher and clean fuel rewards, which stacked together can cut the price of a truck below $100,000.
• At that price the truck pays for itself immediately instead of taking five years, so the states handing out the most money will see the most Tesla semis on the road.
• The semi could add roughly $1.5 billion in operating profit by 2030, though weak adoption or cheaper diesel would undercut that.
• A Democratic win in the midterms or in 2028 is seen as the trigger for federal truck credits coming back.

Outlook: Tesla Semi demand will likely stay concentrated in California until federal support returns.