So I did some digging around, and found out the following information (all of which is contained in
UNDANG-UNDANG REPUBLIK INDONESIA NOMOR 11 TAHUN 2016 TENTANG PENGAMPUNAN PAJAK)
Who can participate
All persons and Indonesian legal entities. Including foreigners and PT PMA. The only exceptions are those who are currently under investigation *and* their file is already accepted by prosecutors.
What is taxed.
They have made it really simple. Retrieve your SPT 2015, and see the section on where you reported your assets. Now find out what your actual assets are. Find the difference and this is your amount to be taxed via amnesty. You may subtract liabilities, up to 50% of the values of assets if you are a person, or 75% if you are a company. You may want to separate this into two categories, namely assets in Indonesia and outside of Indonesia.
Tax rate.
There are 3 different rate categories, and are graded by when you report:
Assets already in Indonesia are taxed at 2% if you report within the first 3 months of amnesty (the law was effective 18 July 2016), 3% if you report after the first 3 months, but before 31 Dec 2016, 5% if you report between 1 January 2017 to 31 March 2017.
Assets outside of Indonesia are taxed at 4% if you report within the first 3 months of amnesty, 6% if you report after the first 3 months, but before 31 Dec 2016, 10% if you report between 1 January 2017 to 31 March 2017.
Assets abroad that is repatriated to Indonesia receive the same rate as assets in Indonesia (ie. 2%, 3% and 5% as above), but have to be invested for at least 3 years in approved vehicles.
Benefits
The law spells out 6 benefits of obtaining amnesty
1) Forgiveness on all outstanding taxes that should have been paid.
2) Forgiveness on all outstanding penalties that should have been paid.
3) No investigation or prosecution on any reported items.
4) Stopping of all current investigations, provided they have not progressed beyond the investigation stage (ie. hasn't been sent to prosecutors, or further)
5) Guarantee of privacy. Tax amnesty data may not be used for any investigation or prosecution, including criminal investigations.
6) Registering assets not currently in your name will be exempt from PPh.