Corporate Tax

How to Calculate Corporate Tax in the UAE

2025-10-22 · 5 min read · By Aureus Worldwide

Understanding how UAE Corporate Tax (CT) is calculated demystifies the whole regime. The headline rates are simple, 0% on the first AED 375,000 of taxable income and 9% above, but the journey from your profit-and-loss account to the number you actually pay involves several defined steps. This guide walks through that calculation in plain terms so you can see how the figure on your return is built and where the main adjustments arise.

The key idea to grasp is that Corporate Tax is not charged on your accounting profit directly. Instead, accounting profit is the starting point, and the law then makes a series of defined adjustments to arrive at taxable income, the figure the rates actually apply to. Some adjustments increase taxable income, some reduce it, and some simply change the timing of when income or expenses are recognised. Once you understand this structure, the calculation stops feeling like a black box and becomes a logical sequence you can follow.

Step 1: start with accounting profit

Corporate Tax begins with the accounting profit shown in your financial statements, prepared on an accruals basis under applicable standards. This is your revenue less your business expenses for the tax period. The cleaner and more complete your accounts, the more reliable every later step becomes.

Step 2: identify your tax period

Your CT is calculated for a tax period, usually aligned to your financial year. All income and expenses for that period feed the calculation. Make sure cut-off is correct so that revenue and costs fall in the right period.

Step 3: adjust for exempt income

Certain income may be exempt and removed from the calculation. Depending on the rules, this can include qualifying dividends and certain gains. Identifying exempt income early prevents you from overstating taxable income. For more on what can qualify, see our guide to exempt income.

Step 4: add back non-deductible expenses

Not every accounting expense is deductible for tax. Common add-backs include:

• A portion of certain entertainment costs
• Fines and penalties
• Expenses not incurred wholly for the business
• Amounts above any specific deduction caps

These are added back to accounting profit, increasing taxable income. The logic is that tax relief is only given for costs the law considers genuinely deductible business expenditure. A fine for breaking a rule, for instance, is a real cash cost to your business but is not something the tax system is willing to subsidise through a deduction. Going through your expense ledger and identifying these add-backs is one of the more detailed parts of the calculation, and it is worth doing carefully because errors here directly change the tax due.

Step 5: apply the interest limitation

Net interest deductions can be capped under the general interest limitation rules. If your financing costs are significant, calculate whether part of your net interest must be disallowed and potentially carried forward. Our explainer on the interest deduction limitation covers the mechanics.

Step 6: apply reliefs and losses

Before reaching taxable income, apply any reliefs:

Reliefs have strict conditions, so apply only those you genuinely qualify for.

Step 7: arrive at taxable income

After adjustments and reliefs, you reach taxable income. This is the figure the rates apply to. A simplified illustration:

The numbers above are illustrative only and do not represent any specific business or guaranteed outcome.

Step 8: apply the 0% and 9% rates

Now apply the rates to taxable income:

1. Tax the first AED 375,000 at 0%.
2. Tax the remainder at 9%.
3. Add the two results for your CT liability.

Using the illustration above, taxable income of AED 600,000 would give: AED 375,000 at 0% (nil) plus AED 225,000 at 9% (AED 20,250). Again, this is illustrative only, your figures will differ.

Notice how the threshold works in practice. Because the first AED 375,000 is always taxed at 0%, the effective rate on total taxable income is always lower than the headline 9%, and the smaller your profit, the lower that effective rate. A business with taxable income of exactly AED 375,000 pays nothing, while one well above the threshold approaches, but never quite reaches, a 9% effective rate. Understanding this helps you anticipate your liability rather than being surprised by it.

Step 9: consider free zone status

A qualifying free zone person may have qualifying income taxed at 0%, with non-qualifying income at 9%. The conditions are detailed and must be met continuously. Our guide to qualifying income explains how this works.

Keep the rules current

Rates, thresholds, reliefs and adjustment rules can change, and the calculation above is a simplified overview rather than tax advice. Always confirm the current position with the relevant authority, and have material calculations reviewed by a qualified adviser.

How Aureus Worldwide helps

Aureus Worldwide calculates Corporate Tax for UAE businesses from the ground up, preparing financial statements, identifying adjustments and reliefs, and computing the liability so your return is accurate. Our tax team and accounting team keep the calculation consistent with your books year after year. To understand your CT position, contact our advisors.

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