The discount offered on a new car rarely comes out of the dealer's own margin. Most of it is funded by the manufacturer through mechanisms that are invisible to the buyer, and knowing they exist explains why prices move.
Why dealer margin is thinner than it looks
The difference between what a dealer pays for a car and its list price is smaller than most buyers assume, and it has narrowed over time.
A dealer discounting from that margin alone could not sustain the reductions routinely advertised.
Most profit in a franchised dealership comes from finance commission, servicing and used vehicles rather than from the new car transaction itself.
What manufacturer support looks like
Manufacturers run programmes that pay a dealer a sum per vehicle registered, often varying by model and by period.
Support can be attached to particular customer groups, to trade-ins, or to finance taken through the manufacturer's own lending arm.
Because the support is set centrally and changed periodically, the achievable price on an identical car varies with the calendar rather than with negotiation.
How volume targets shape behaviour
Dealers are set registration targets over defined periods, and reaching a target releases a bonus paid across every unit sold in that period.
The value of that bonus can exceed the margin on several individual cars, which makes selling the final vehicles of a period worth doing at very little profit.
This is the mechanism behind the familiar advice about buying at the end of a quarter, and it is real rather than folklore.
Why finance is where the offer sits
Subsidised interest rates and inflated deposit contributions are funded by the manufacturer and delivered through its finance company.
Presenting support this way ties it to a finance agreement, which generates commission and increases the likelihood the customer returns at the end of the term.
It is also why a cash buyer is sometimes offered a worse total price than someone taking finance, which reverses the intuition most people bring to a showroom.
What this means for a buyer
The useful question is which programmes currently apply to the car in question, since that determines how much room exists before the dealer is discounting its own margin.
Comparing the total cost of an agreement rather than the headline discount reveals where the support has actually been placed.
Registration periods, model year changes and the arrival of a replacement model all shift the programmes, and timing a purchase around them affects price more than negotiating does.