How much tariff if buying $10k from Japan?

No personal experience with Japan, but for several other puchases (from Singapore, England and Poland), the approach and experience varied quite a bit. The dollar amount for the tariff from Poland was added on as an import or duty cost by FedEx. I was unable to pay online, and then unable to pay by phone (it came to $99) which was actually less than it should have been according to the published tariffs). I emailed the seller to see if he knew anything (like, had he paid the cost?) and they had no clue. A new bill came to me the next month for $89 (no idea why it dropped) and I was able to pay this one to FedEx online.

For my purchases from Singapore, one item was already in the United States in a LA warehouse so it dodged the tariff apparently. The seller promises (on their website) to pay all shipping related costs and ate the tariff on the second purchase. Another Singapore seller finally raised the online prices (explicitly because of tariffs), but still promised to pay all shipping related fees. Finally, a seller to me (not stereo stuff) in the UK, shipped me some goods and had no clue what the tariff related charge would be - it is waiting for me to go to the post office to pick it up tomorrow and I guess I will find out that charge then!  The suspension of de minimis exemptions has really hurt the sales of many international companies (the purchase from the UK was less than $800).

The upshot is that every company is dealing with it differently; the information is changing every day as courts rule against tariffs, then stay the rulings, etc; and no one can keep up. A company in Japan can scarcely be expected to be on top of a constantly changing rule from the US. For your substantial purchase, I would of course first and foremost ask the seller what they are going to do and what their experience has been. But if the overall cost is lower than buying it currently here, then it is still worth it and hopefully your Christmass will start early! Enjoy.

Well as the old saying goes it’s as clear as mud. A few months ago I sent a DAC from here to Switzerland and back. The word repair was in the description when sent away but not for return. No tarriff was charged on the high value item. 

@fpomposo CA tax is 7.25’% (Some locations do also charge city tax making it 10% plus.) Low and middle tax brackets in CA pay leas State Tax than many other states.

@nasaman Hope it’s a tube Amp. 

@wsrrsw I’m in LA , LA county is 9.75%, some areas are even higher at 10.25%.. I’m a reseller and I collect and pay monthly sales tax payments for my business on top of all the stuff I buy. The reason I say it's a ripoff is because of how insanely bad, wasteful, mismanaged and embarrassing our state is ran, highest cost of everything, highest taxes, and highest in homeless camps and lots of other problems...

Newsome just spent $450 million to "update" the 911 system  then they announced they scrapped the whole program and the money is gone, and that is just the tip of the iceberg of insane fraud and waste, secret billions to upgrade the capital building all with secret contracts, the corruption and incomptence never ends in California 

@fpomposo respectfully, you have no idea how CA is run if you say nonsense like this. Be specific about where the corruption and incompetence is otherwise it's just baseless accusations.