Cabinet "decided to approve the Unified Agreement for Value Added Tax" to be implemented throughout the six-member Gulf Cooperation Council, the official Saudi Press Agency said.
"A Royal Decree has been prepared," it said.
A five-percent levy will apply to certain goods following a GCC agreement last June.
The move is in line with an International Monetary Fund recommendation for Gulf states to impose revenue-raising measures including excise and value added taxes to help their adjustment to lower crude oil prices which have slowed regional growth.
Regional residents had long enjoyed a tax-free and heavily subsidised existence.
Saudi Arabia, the world's biggest oil exporter, froze major building projects, cut cabinet ministers' salaries and imposed a wage freeze on civil servants to cope with last year's record deficit of $97 billion.
It also made unprecedented cuts to fuel and utilities subsidies.
The kingdom is boosting non-oil revenue as part of economic diversification efforts and aims to balance its budget by 2020.
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