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Taxable income under UAE corporate tax starts with accounting net profit, then gets adjusted. Some expenses reduce that profit in full. Some are capped. Others are not deductible at all, even when the spending was real. If you get this wrong, you can overstate or understate your tax bill.
The second mistake is the one that usually triggers an FTA reassessment. Our corporate tax accountant in Dubai can help you structure your accounts so these adjustments are clear from the start.
The General Rule: Wholly and Exclusively for Business
The basic rule, as confirmed by the Federal Tax Authority, is simple. Business expenses incurred to generate taxable income are generally deductible. The deduction timing depends on the expense type and the accounting method. Capital assets are not deducted in one go. They are written off over their useful life through depreciation or amortisation.
If an expense has both personal and business use, only the business part is deductible. A car used for client visits and personal errands needs to be split between the two. You cannot claim the full cost just because the car is registered to the company.
Expenses That Are Restricted, Not Banned
Two types of otherwise legitimate expenses face specific caps under UAE CT law instead of a full ban:
Interest expense is limited by the net interest deduction rule, which usually caps the deduction at a percentage of EBITDA, that is, earnings before interest, tax, depreciation, and amortisation. This matters most for debt-financed businesses, real-estate-heavy businesses, and companies funded through related-party loans. Interest above the cap in a given period does not reduce taxable income in that period.
Entertainment expenditure is only 50% deductible. This includes client entertainment, hospitality, and similar spending used to build or maintain business relationships. The other half is added back when taxable income is calculated, even if the full amount was a genuine business cost with receipts.
Expenses That Are Not Deductible at All
Some costs stay out of the taxable income calculation, no matter how the business records them internally:
- Fines and penalties, including administrative penalties paid to the FTA, are not deductible.
- Bribes and illegal payments are never deductible, even if they might be treated differently in another jurisdiction.
- Dividends and profit distributions are not deductible expenses. They are a distribution of after-tax profit, not a cost of earning it.
- Personal expenses unrelated to the business, even when paid from a company account, are excluded.
- Donations, grants, or gifts to anyone other than a Qualifying Public Benefit Entity are generally not deductible.
Claiming any of these as a deductible cost on a corporate tax return can understate taxable income. That is the kind of adjustment the FTA looks at early in an audit.
Related-party transactions must be priced at arm’s length
If your business deals with related parties or connected persons, inside or outside the UAE, those transactions must be priced as if the parties were independent. That is the arm’s length principle. It applies to a shareholder, a sister company, or a connected individual. It also applies to UAE-to-UAE transactions, not just cross-border ones. A review before filing is usually more useful than waiting for an FTA query if your business has material intercompany transactions.
A simple example: client entertainment
A UAE consulting firm spends AED 40,000 during a tax period on client dinners and a small client event. The full AED 40,000 is a genuine business cost, and it was incurred to maintain client relationships. Under the 50% entertainment cap, only AED 20,000 reduces taxable income. The other AED 20,000 is added back when taxable profit is calculated, even though the money was spent for a real business purpose. Businesses that assume full deductibility often end up with a higher taxable income and a higher tax bill than expected.
Why this matters more than it looks
Taxable income begins with accounting profit, then adjustments follow. That means a business can look profitable on paper and still owe less tax than expected, or more, depending on how those adjustments are handled. This is where good bookkeeping stops being a compliance chore and starts affecting the tax bill directly. If your records do not clearly separate deductible, capped, and non-deductible costs from the start, filing becomes slower and riskier. Good bookkeeping keeps the chart of accounts ready for those adjustments from day one.
Frequently Asked Questions
Are salaries and staff costs fully deductible?
Salaries, wages, and related staff costs that are incurred wholly for business purposes are generally deductible in full, subject to the rule that the expense must be wholly and exclusively for business.
Is VAT paid on purchases deductible against corporate tax?
No. VAT and corporate tax are separate taxes with separate treatment. Recoverable input VAT goes through the VAT return, not against corporate tax again.
Can capped interest expense be used in a later tax period?
Depending on the rules in force, some disallowed interest can be carried forward, subject to conditions. This is a technical area, so a review of your financing structure helps more than a general answer.
Do free zone companies follow the same deduction rules?
A free zone company taxed at the standard 9% rate on non-qualifying income follows the same deduction principles as any other taxable person. A Qualifying Free Zone Person’s qualifying income at 0% is calculated differently. Deductions matter most for the income that is actually subject to the 9% rate.
This article explains general UAE corporate tax deduction principles and is not a substitute for a review of your specific expenses and related-party transactions. Speak with our corporate tax advisory in the UAE before finalising deductions on a filing.
