A joint account changes to a non-joint account, CGT? Gift tax? Something else?

[kanpanela]

First of all, I would like to thank everyone on this forum for being so helpful and
knowledgeable. Hopefully with all the research and questions I ask, I could amass enough
knowledge to pass on the knowledge to other newbies who will be fortunate enough to stumble
upon this forum in the future.
Thanks again m(__)m

As for the question,
let's say there is a joint account of A and B (names of people with a family relation),
95% of the assets in the account (provable through logs) belong to A,
and B leaves the account (i.e. account owner changes to A only).

1. Does A have to pay capital gain tax on the assets in the account despite not selling
anything? Perhaps only on the small portion that is not his own?
2. Does A have to pay gift tax on any of the assets? Perhaps only B's?
3. Does it make a difference if it's a domestic or an overseas account? If it does make a difference,
then how would it be if it is an overseas account and A is a non-permanent tax resident? (i.e. less than 5 years)
4. Any other tax events that I am missing?
*. Are these questions better suited to a tax advisor? If so, what kind of service
is this? A one-time consultation (without preparing a report)?

I can guess at the answers intuitively, but if anyone has experience or knowledge I would
be really glad to hear! I could not find anything online so if you happen to know of any
sources with answers to these questions as well I would also be forever grateful.

Thanks for the help!

[Established]

First of all, I would like to thank everyone on this forum for being so helpful and
knowledgeable. Hopefully with all the research and questions I ask, I could amass enough
knowledge to pass on the knowledge to other newbies who will be fortunate enough to stumble
upon this forum in the future.
Thanks again m(__)m

As for the question,
let's say there is a joint account of A and B (names of people with a family relation),
95% of the assets in the account (provable through logs) belong to A,
and B leaves the account (i.e. account owner changes to A only).

1. Does A have to pay capital gain tax on the assets in the account despite not selling
anything? Perhaps only on the small portion that is not his own?
2. Does A have to pay gift tax on any of the assets? Perhaps only B's?
3. Does it make a difference if it's a domestic or an overseas account? If it does make a difference,
then how would it be if it is an overseas account and A is a non-permanent tax resident? (i.e. less than 5 years)
4. Any other tax events that I am missing?
*. Are these questions better suited to a tax advisor? If so, what kind of service
is this? A one-time consultation (without preparing a report)?

I can guess at the answers intuitively, but if anyone has experience or knowledge I would
be really glad to hear! I could not find anything online so if you happen to know of any
sources with answers to these questions as well I would also be forever grateful.

Thanks for the help!

Where is this account domiciled? Japan does not have joint accounts. Even adolescent accounts are in the name of the child and only administered by the parents.

[kanpanela]

Where is this account domiciled? Japan does not have joint accounts. Even adolescent accounts are in the name of the child and only administered by the parents.

I see! In that case let's talk about a western non-U.S. account.
Does the specific country matter?
I assumed the tax will be paid to Japan so Japan rules decide, am I wrong?

[Established]

Where is this account domiciled? Japan does not have joint accounts. Even adolescent accounts are in the name of the child and only administered by the parents.

I see! In that case let's talk about a western non-U.S. account.
Does the specific country matter?
I assumed the tax will be paid to Japan so Japan rules decide, am I wrong?

What country? It would depend on the tax treaty.

[kanpanela]

Where is this account domiciled? Japan does not have joint accounts. Even adolescent accounts are in the name of the child and only administered by the parents.

I see! In that case let's talk about a western non-U.S. account.
Does the specific country matter?
I assumed the tax will be paid to Japan so Japan rules decide, am I wrong?

What country? It would depend on the tax treaty.

I see.
I appreciate you wanting to help but I am hesitant to divulge my country of origin if possible.
I will try and look at the treaty again to see if I can dig something out but,
which treaty should I look at? Let's call my country of origin A.
If the joint account is in country A with American ETFs, which of the following treaties is relevant?
a. A-Japan
b. A-US
c. Japan-US

I am getting really depressed with all this complexity

[JamesSan]

I would probably say the b. A-USA