https://www.arabianbusiness.com/ :UAE businesses choosing between free zone and mainland structures face materially different Corporate Tax calculations in 2026. Mainland entities generally pay 0% on taxable income up to $102,110 (AED 375,000) and 9% above that amount. Qualifying Free Zone Persons receive a 0% rate on Qualifying Income. Non-Qualifying Income attracts a 9% rate.

Federal Tax Authority guidance confirms that Qualifying Free Zone Persons do not receive the $102,110 (AED 375,000) zero rate threshold on taxable income that fails the Qualifying Income test. Business costs consequently depend on profit, revenue classification, audit requirements and eligibility for reliefs.

Mainland companies use the standard corporate tax bands
Mainland businesses calculate Corporate Tax using the standard UAE rate structure. Taxable income up to $102,110 (AED 375,000) attracts 0%. Taxable income above that level attracts 9%.

A company generating $272,300 (AED 1 million) in taxable income would face Corporate Tax of about $15,317 (AED 56,250), before any available relief.

A Qualifying Free Zone Person recording the same amount entirely as non-qualifying taxable income would face about $24,506 (AED 90,000). FTA rules apply the 9% rate to that entire non-qualifying amount.

Eligible resident businesses also retain access to Small Business Relief for qualifying tax periods ending on or before December 31 2026. Revenue must remain at or below $816,882 (AED 3 million) during the relevant and previous applicable tax periods. Qualifying Free Zone Persons cannot elect for Small Business Relief.

Free zone income classification determines the tax charge
Qualifying Free Zone Persons retain 0% Corporate Tax on income meeting the Qualifying Income requirements. Operators must meet the conditions during every relevant tax period.

Ministerial Decision No. 229 of 2025 updated the qualifying activity rules from September 2025. Qualifying commodity trading expanded to cover industrial chemicals, associated byproducts and environmental commodities. Ministry guidance also clarified treasury and financing services provided to related parties.

Non-qualifying revenue must remain within the de minimis limit. Current rules set that ceiling at the lower of 5% of total revenue or $1.36 million (AED 5 million). Businesses breaching the limit lose Qualifying Free Zone Person status from the start of that tax period and for four subsequent tax periods.

Revenue classification can consequently alter the effective tax cost sharply. Free zone companies need transaction records capable of separating qualifying revenue from revenue attracting the standard rate.

Audit rules create an additional compliance requirement
Ministerial Decision No. 84 of 2025 requires every Qualifying Free Zone Person to prepare and maintain audited financial statements. Revenue size does not remove that obligation.

Other taxable persons generally face the statutory audit requirement once annual revenue exceeds about $13.6 million (AED 50 million). Tax groups must prepare audited special purpose aggregated financial statements under the 2025 rules.

Free zone businesses seeking the 0% rate also need adequate substance and records supporting their Qualifying Income calculations. Ministerial Decision No. 229 requires audited accounts as part of the conditions for retaining Qualifying Free Zone Person status.

Mainland companies below the statutory audit threshold can consequently face a different compliance cost profile. Actual spending still depends on licensing arrangements, accounting complexity, transaction volumes and any separate regulatory audit requirements.

September deadline brings 2025 tax bills into focus
Federal Tax Authority requirements bring these differences directly into the 2026 filing cycle. Taxable persons must generally file Corporate Tax returns and settle liabilities within nine months after their tax period ends.

Businesses with financial years ending December 31 2025 must file their returns and pay Corporate Tax by September 30 2026. FTA guidance issued on September 2 2026 also confirms that businesses electing for Small Business Relief must submit their simplified returns within the statutory period.

Free zone entities therefore need to test revenue classification before calculating the final liability. Mainland companies apply the standard taxable income bands and any reliefs for which they qualify. Qualifying Free Zone Persons must maintain the qualifying conditions, monitor the de minimis ceiling and absorb mandatory audit requirements.

Those operating differences determine the real Corporate Tax cost behind the respective licence structures.