Highflyer Taxation Services provides specialist expatriate tax advice and tax compliance services to Australians working overseas and overseas nationals working in Australia. Highflyer Taxation Services also offers United States tax return preparation services to United States citizens working in Australia and Australians working in the USA.

The principal of Highflyer Taxation Services is Gavin Seto. Gavin worked with Arthur Andersen for 10 years and was a Senior Manager in it's International Executive Services Tax Group. Gavin also worked for Deloitte Touche Tohmatsu and was a Principal in it's International Assignment Services Tax Group.

Gavin left the "Big 5" to set up his own practice as he saw a specific need in the market for expatriates (and companies employing expatriates) who require Big 5 specialist skills and service but at a much more affordable price.