The Nauru government says it's been confirmed as fully compliant with European Union tax and financial security regulations.
Last year the EU declared six Pacific region countries were on a grey list - Fiji, the Cook Islands, Nauru, Niue, Vanuatu, and New Caledonia.
A number of others were placed on a blacklist.
The EU said the countries weren't meeting international standards and hadn't made sufficient commitments to change their ways.
Now Nauru finance minster David Adeang said his government has now complied with the EU's strict requirements, which aim to stop companies hiding profits and avoiding tax.