You are correct about the tax credit, but the total price still does not add up, from the configurator today (do you see what I am missing?):
Model X P90D 108,000
*Including $7,500.00 Federal Tax Credit
All-Wheel Drive Included
EXTERIOR
Titanium Metallic Paint 1,000
20" Silver Wheels Included
INTERIOR
Black Leather Seats 2,500
Carbon Fiber Décor 1,000
Light Headliner Included
Seven Seat Interior 4,000
PERFORMANCE
Ludicrous Speed Upgrade 10,000
Active Spoiler Included
Tesla Red Brake Calipers Included
CHARGING
Supercharger Enabled Included
High Amperage Charger Upgrade 1,000
OPTIONS
Autopilot Convenience Features 2,500
Premium Upgrades Package 4,500
Smart Air Suspension Included
Ultra High Fidelity Sound 2,500
Subzero Weather Package 1,000
Towing Package 750
Destination & Doc Fee 1,200
Before the $7,500.00 federal tax credit, the price of this Model X is $147,450.00 . Tax credits either decrease your annual tax due or increase your annual tax refund – they do not reduce your amount due at time of delivery.