When is an inheritance from another country complicated enough to need specialized tax advice?

For the relevant filing, a filing obligation can exist even when no tax is due, so the form and deadline matter independently of the final tax bill. Keep the source paperwork rather than relying only on a summary, then have a tax adviser confirm the reporting taxpayer, form, basis, and due date before filing. Since penalties for some international information returns can be substantial, the recipient should obtain cross border tax advice before moving or restructuring the assets.