***Not*** ***investment advice***. I have some tax questions that I’m hoping others here have had experience with.
On May 8, I bought 12,000 shares of SONY Corp. for at about ¥12207/share.
On May 15, I sold 9,000 of those shares at about ¥13312/share.
This resulted in a realized gain of ¥9,880,582 after deducting brokerage fees and margin interest. The brokerage withheld about ¥2,000,000 for capital gains tax.
Do Japanese brokerages (SBI, in my case) automatically account for trading history when withholding tax? e.g., if I incurred a capital loss last year, will the brokerage know to reduce my tax withholding from carrying over the losses? Do I need to manually account for those carryovers in my 2024 tax return? Does it matter if I purchased with own funds vs. margin?
Thanks!
[SONY stock chart](https://preview.redd.it/2b6tp0pv401d1.png?width=817&format=png&auto=webp&s=33e903e6ec75f07537f54ce368cabcdb443cc024)
[SONY stock table](https://preview.redd.it/2m32skg0501d1.png?width=620&format=png&auto=webp&s=6dade61daf6b735515de452a6e2e0d415f9b9c30)
by kextatic