Google has reached a settlement worth almost half-a-billion dollars with the Tax Office after a marathon decade-long dispute over its tax practices in Australia.

The settlement, which involves no admission of liability, will see it fork out $481.5 million to the tax office after an audit investigated its tax practices between 2008 and 2018.

Google has settled with the ATO. Credit:AP

The ATO has now netted $1.25 billion after also signing tax settlements with Microsoft, Apple and Facebook over the past two years under the Multinational Anti-Avoidance Law. Google's tax deal follows a $1.5 billion settlement with French tax authorities in September.

A Google spokeswoman said the settlement resolved a "longstanding dispute". "The settlement will also provide certainty in relation to future tax treatment," she said. The settlement was represented in the last consolidated financial results.