GCC Tax Harmonisation: Latest Developments
An overview of tax harmonisation efforts across the GCC — where the six member states are aligned, where they have diverged, and what the differences mean for businesses operating across the region.
The GCC states have committed to a harmonised VAT framework since 2016, when they signed the Unified VAT Agreement. A decade on, the reality is more complex: while the core VAT structure is shared, implementation details vary significantly between member states. Here is the current picture.
What the GCC VAT Agreement established
The Unified VAT Agreement (2016) set the foundation: a standard rate of 5% (with provision for a zero-rate), a registration threshold of AED 375,000 (approximately USD 100,000), and a shared definition of taxable supplies. The agreement also established the principle that each state would implement VAT through its own national legislation.
Where the states have converged
- Standard rate is 5% across all GCC states that have implemented VAT (UAE, Saudi Arabia, Bahrain, Oman — Kuwait and Qatar are still consulting).
- Registration threshold is aligned at AED 375,000.
- Zero-rated categories (healthcare, education, residential real estate, local transport, exports) are broadly similar.
- All states use the TRN (Tax Registration Number) format for identification.
Where they have diverged
- E-invoicing timelines differ: Saudi Arabia is furthest ahead (Phase 2 live); UAE targets July 2026; Bahrain and Oman are in consultation.
- Exempt supplies vary: Oman has a broader exempt category that includes certain financial services; Saudi Arabia's interpretation of zero-rated education is narrower.
- Registration procedures — each state has its own portal, own节奏 and its own enforcement approach.
- Corporate tax: only UAE and Saudi Arabia have active CIT regimes; Oman introduced a new framework in 2024; Bahrain has no CIT.
What cross-border businesses need to track
If you operate in multiple GCC states, you need separate VAT registrations in each state — there is no unified GCC VAT return. Each state has its own filing portal and deadlines. E-invoicing requirements also differ, which means your software may need to produce different document formats for each market.