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Tax On FX Gains

Posted: Tue Feb 06, 2024 6:47 am
by Owl
On Sony Banks website they make it clear that you have to declare and pay tax on FX gains. Can anyone shed any light on how the tax office here deals with FX gains - what constitutes an FX gain, what triggers the tax, what period is it measured over etc - or point me in the direction of something I can read on the subject. I noticed Sony always state your USD account balance in Yen - so I was wondering if there is some notional FX gain/loss based on your yen equivalent balance in a tax year, or whether there has to be one ( or two) conversions to trigger tax.

Re: Tax On FX Gains

Posted: Tue Feb 06, 2024 7:37 am
by sutebayashi
My understanding is you need to have a buy and a sell in order to trigger a taxable event.
Just holding foreign currency won’t trigger it.

So say you bought USD and sold JPY. Then later you sold USD back into JPY.
The taxable profit would be calculated using the USD/JPY rate that applied to your two transactions. This is the straight forward case.

It is more complicated if you have say USD and then buy say EUR, and then later sell those EUR for some other currency. In this case you need to calculate (as you mentioned a notional amount in JPY)
1) how much JPY those initial USD were worth when you bought the USD, and then
2) how much JPY your EUR were worth when you sold the EUR.

(You could conceivably sell those EUR back for USD, and think you made a taxable profit just looking at your extra USD, but if the yen miraculously increased enough in value, the JPY equivalent when you sold the EUR back for USD could be less than the first JPY notional amount, thus meaning no tax were due - that’s my understanding of the rules, as strange as it seems to me)

This page seems decent: https://www.ht-tax.or.jp/topics/gaikayokin-shinkoku/

Also, if you earned income in a foreign currency, just converting it to yen would not incur any tax for the forex conversion, because it would be just one way. Just spending your foreign currency to buy something other than currency would also not incur such tax.

In general, calculating this forex tax is a pain, and the tax rate applied is your top tax rate. Therefore, I try to keep my forex conversions to forex brokers, which do annual trading report calculations that makes it all simpler and also the tax rate is a flat 20.315%, as they fall under futures trading in the tax rules.

If any profit you made was less than 200,000 yen then you are not obliged to file a tax return to report it though.

Re: Tax On FX Gains

Posted: Tue Feb 06, 2024 7:50 am
by Tkydon

Re: Tax On FX Gains

Posted: Wed Feb 07, 2024 4:17 am
by Owl
sutebayashi wrote: Tue Feb 06, 2024 7:37 am My understanding is you need to have a buy and a sell in order to trigger a taxable event.
Just holding foreign currency won’t trigger it.

So say you bought USD and sold JPY. Then later you sold USD back into JPY.
The taxable profit would be calculated using the USD/JPY rate that applied to your two transactions. This is the straight forward case.

It is more complicated if you have say USD and then buy say EUR, and then later sell those EUR for some other currency. In this case you need to calculate (as you mentioned a notional amount in JPY)
1) how much JPY those initial USD were worth when you bought the USD, and then
2) how much JPY your EUR were worth when you sold the EUR.

(You could conceivably sell those EUR back for USD, and think you made a taxable profit just looking at your extra USD, but if the yen miraculously increased enough in value, the JPY equivalent when you sold the EUR back for USD could be less than the first JPY notional amount, thus meaning no tax were due - that’s my understanding of the rules, as strange as it seems to me)

This page seems decent: https://www.ht-tax.or.jp/topics/gaikayokin-shinkoku/

Also, if you earned income in a foreign currency, just converting it to yen would not incur any tax for the forex conversion, because it would be just one way. Just spending your foreign currency to buy something other than currency would also not incur such tax.

In general, calculating this forex tax is a pain, and the tax rate applied is your top tax rate. Therefore, I try to keep my forex conversions to forex brokers, which do annual trading report calculations that makes it all simpler and also the tax rate is a flat 20.315%, as they fall under futures trading in the tax rules.

If any profit you made was less than 200,000 yen then you are not obliged to file a tax return to report it though.
Thank you.

Re: Tax On FX Gains

Posted: Wed Feb 07, 2024 4:18 am
by Owl