What information needs to be recorded from trades in a regular Interactive Brokers Japan account for regular tax reporting, for a long-term Japan resident?
Is a separate tax return via e-Tax or the tax office in spring always necessary? Or can gains be submitted as part of the year-end employer tax reporting (as additional income, for example) if they're under a certain amount.
Also, I think the IB account allows losses to be offset for up to three years (?) so does that mean nothing has to be reported until then, and then only the profit does?
I've recently opened an account and haven't done much with it yet but I want to know what I need to record so it doesn't become a scramble at the end of the year. Sorry these are probably basic questions – if there's a good website that explains all or some of this that'd be really helpful.
by Aware-Fisherman6175