@ The Accountant and others regularly discuss what I regard as the single most important accounting rule Tesla employs.
That is the rule governing income recognition on sale of a vehicle. Tesla is alone among automakers, I believe :
"We recognize revenue on automotive sales upon delivery to the customer, which is when the control of a vehicle transfers. Payments are typically received at the point control transfers or in accordance with payment terms customary to the business." Tesla 2020 10K
Contrast this with GM:
"We present both wholesale and total vehicle sales data to assist in the analysis of our revenue and our market share. Wholesale vehicle sales data consists of sales to GM's dealers and distributors as well as sales to the U.S. Government and excludes vehicles sold by our joint ventures. Wholesale vehicle sales data correlates to our revenue recognized from the sale of vehicles, which is the largest component of Automotive net sales and revenue." General Motors 10K 2020
Thus Tesla cannot and does not record sale of surplus vehicles to dealers. GM can and does do that.
A related convention is reporting of inventory "days on hand". While the global practice does vary somewhat, the general convention is that a 60 day inventory on hand is optimal. Due to the typical OEM wholesale practices the manufacturer tends to have cash flow delayed until the vehicle is sold by a dealer. The typical "floor plan" structures vary widely so OEM's can be paid prior to dealer sale when the floor plan is not offered by the OEM. Even when that si the case the OEM tends to be paid at least 30 days after the wholesale revenue has been recognized.
What does that mean? Tesla averages less than two weeks inventory days on hand. When they recognize a sale Tesla has cash. When the typical OEM recognizes a sale they wait at least 30 days to receive cash, usually more.
Tesla not has typical payment terms from suppliers of net 90, net 60 in a few cases.
So, Tesla generates more cash flow as growth advances. Higher growth yields higher cash flow to Tesla, and Tesla alone.
Virtually all other OEM's burn more cash as they grow faster because their business cycle is much longer than is Tesla's.
Thus far the Tesla advantage is only in recognition of sale. Since their sales are direct the conventional wisdom suggest stay would ahem higher inventory and slower cash flow, but that is not so.
Therefore we must also observe another major Tesla advantage, high vertical integration. Not since the original Ford River Rouge plant has a auto OEM had such high vertical integration.
Tesla has a very rapid conversion cycle from raw material to completed vehicle due to an industry leading manufacturing efficiency. They thus are buying raw materials and rapidly converting those to finished goods. They also how small inventories of supplied parts, which do have those long payment cycles.
Because they go from parts and material to a finished vehicle in a cycle of< I am informed, roughly 14 days. On average Tesla delivers completed vehicles, on average, in about 21 days. For the majority of sales it seems they are actually faster than these times.
When we use these conservative numbers we find that Tesla generates cash of an extra 26 days as they grow, and that is using net-60 payment terms.
Elon and others have from time to time said they now must pay suppliers after Tesla has already been paid. The simple example here shows how that happens.
Finally, this also shows why Tesla is anxious to begin producing where the cars are to be sold. People used to think that is mostly about reducing shipping costs, which in part it is. The biggest benefit, though, is in improving cash flow. When shipping vehicles from Fremont and Shanghai to Europe or even distant parts of Noth America or China the shipping times alone eradicate most or all the cash flow advantage, plus the direct shipping costs and or tax costs.
When considering tax issues Tesla built Tilburg. When Tesla builds a factory in Mexico they'll have both NAFTA and Mercosur access duty free. When a 'Model 2' appears the scale economies in Mexico plus cheap shipping will allow them access to the worlds' sixth largest vehicle market without too much bureaucracy. The cash flow consequences will become positive there also because of rapid conversion cycles.
Of course we all know there are FSD subscriptions and paid Supercharger access as well as opening Supercharger access to other brands. All of that will have very positive cash flow consequences also. Further, even if priced favorably to consumers the net Sup[erchargers will defray system costs and potentially generate profits. For context please note that Tesla is already licensed as a power provider in the EU and UK.
Very soon I am confident that our forecasting mavens will begin modeling these factors.