The first Corporate Tax return is unfamiliar territory for most UAE businesses, and unfamiliar territory is where mistakes happen. Some errors cost money directly, by overstating the tax. Others cost money later, by inviting a query or a penalty. With the 30 September deadline close, it is worth knowing the mistakes that recur most, because nearly all of them are avoidable with a little care before you submit. Here are the ones that catch businesses out on a first return.
The mistakes that cost the most
They cluster into a short list. None is exotic; each comes from treating the return as a form to complete rather than a calculation to get right.
| Mistake | What it costs |
|---|---|
| Not filing at a loss or below the threshold | A late-filing penalty for a return you assumed you did not need |
| Starting from the wrong profit figure | Tax built on accounts that do not stand up |
| Missing the add-backs | Understated income now, an adjustment and penalty later |
| Claiming a relief you cannot support | A position that fails on review |
| Forgetting to pay by the same date | A late-payment penalty on an on-time return |
Starting from a shaky profit figure
The return begins with accounting profit, so if the financial statements are wrong, everything built on them is wrong. Businesses that never prepared proper accounts, or that pull a rough figure from a spreadsheet, are constructing their tax on sand. The fix is upstream: finalise financial statements you would be comfortable defending before you touch the return. The return is a calculation on top of the accounts, and it can only be as reliable as they are.
Skipping the adjustments between profit and taxable income
Accounting profit is not taxable income. Certain expenses are not deductible for tax and must be added back, and certain reliefs reduce the figure. A business that files its accounting profit as if it were taxable income, without the adjustments, has almost certainly got the number wrong, usually understating the tax, which surfaces later as an assessment with a penalty attached. Knowing which of your costs are non-deductible, and applying the add-backs, is central to a correct return.
The two errors that dominate first returns are opposite in direction: assuming a loss means nothing to file, and filing accounting profit without the tax adjustments. Both are expensive, and both are avoidable before you submit.
Claiming reliefs you cannot stand behind
Small Business Relief, free zone treatment, and other reliefs can materially reduce the tax, but each has conditions, and claiming one you do not actually qualify for is worse than not claiming it. A relief taken without support does not just fail on review; it can undermine the credibility of the whole return. Before you rely on a relief, confirm you meet its conditions and keep the evidence. A defensible smaller claim beats an aggressive one that collapses.
Treating filing and payment as separate
Even a perfectly prepared return goes wrong at the last step if the payment is forgotten or left late. Filing and paying are due on the same date, and a business that submits on time but pays afterwards has still incurred a late-payment penalty. This is the easiest mistake of all to avoid: complete the payment as part of the same exercise as the filing, with enough lead time for it to clear.
What to do about it
Before you submit, run the short check: are you filing even at a loss; do your accounts stand up; have you made the add-backs; can you support every relief you claim; and is the payment set to clear by the deadline. Each of these is a place a first return goes wrong, and each takes minutes to check against hours to fix afterwards. The businesses that file cleanly are not the ones that rushed; they are the ones that checked the return against these five points before pressing submit.
This article is general information and is not tax advice. The correct treatment depends on your circumstances and the current rules. We would be glad to review your return before you file.