there is a inheritance tax for successors in Korea and must file it in 6 months if one of successors were a resident in Korea. But if every successors were non-resident or the ancestor was a non-resident, the successor must file it in 9 months.
Tax rate is 10%, 20%, 30%, 40% and to 50% for 100mil.won, 500mil.won, 1bill.won, 3bill.won and more than 3bill.won respectively.
For inheritance tax return and other works, a non-resident need a street smart agency for their deposit withdraw and property registry in Korea including a proper tax return on time.
There are a lot of deductions, and it's different by successors and type of properties, so basically need a overall strategy for tax saving after the summary of property and family member who's on the successors' list.
For more details, please contact email@example.com always