I have always avoided to buy my cars in the last months of model year as it can have a significant impact on depreciation when you want to trade your car. Is it the same with Tesla?
Yes.
But you can also snag significant end-of-year discounts from most OEMs, including Tesla, as they are pushing to get the inventory out the door. Also, dealers/sales-people, including Tesla's, are pushing to meet their quotas in December, so expect extra incentives (free supercharger miles, free feature upgrades, etc).
I would not care to wait until January to order if it saves me one year of depreciation.
It will.
We have been trained to consider only model year to determine depreciation. The depreciation for Tesla happens more with the introduction of new features than with clicking over to the next model year.
Do you have any evidence to back up this claim?
Model year (MY) is a proxy for age, mileage, and wear an tear. As imperfect as it is, it has stuck for a reason. All wear considerations are fully valid when shopping for a used Tesla, as with any other automotive OEM.
If anything, features are less of a factor with Tesla's due to over-the-air upgrades, and loosely documented hardware evolution milestones.
Used buyers usually want the month and year of manufacture.
Not true.
I've bought and sold multiple vehicles on Autotrader (have one listed right now).
Not once has anyone ever asked me for a month of manufacturing.
a