Corporate tax is no longer new in the UAE — but 2026 is the year deadlines start biting for businesses that registered late, elected reliefs incorrectly, or assumed "small" meant "exempt." Here's a plain-language guide to the dates and duties that matter, and the mistakes we see most often.
First: registration is not optional for most businesses
The most expensive misunderstanding in the market is that businesses earning below the AED 375,000 threshold don't need to register. In most cases, registration with the Federal Tax Authority is still mandatory — the threshold determines the rate applied to taxable income (0% up to AED 375,000, 9% above it), not whether you register. Late registration attracts administrative penalties, so if your company hasn't registered yet, that's task number one.
The filing rule that decides your personal deadline
Your corporate tax return and any payment are due within nine months of the end of your financial year. That single rule generates different deadlines for different companies:
- Financial year ended 31 December 2025 → return due by 30 September 2026
- Financial year ended 31 March 2026 → return due by 31 December 2026
- Financial year ended 30 June 2026 → return due by 31 March 2027
Check your licence and Memorandum of Association if you're unsure which financial year applies to you — many SMEs discover theirs isn't the calendar year they assumed.
Small business relief: valuable, but it must be elected
Eligible resident businesses with revenue below the prescribed limit can elect small business relief and be treated as having no taxable income for the period. Two things trip people up: the relief is elected in the return, not automatic, and electing it when you don't qualify creates its own problems. If your revenue is anywhere near the limit, get the assessment done professionally before you file.
Free zone companies: 0% is conditional, not guaranteed
Qualifying Free Zone Persons can benefit from a 0% rate on qualifying income — but the conditions around substance, qualifying activities and de minimis non-qualifying income are technical. A free zone licence alone does not equal 0% tax. This is the single area where we most often see confident assumptions collapse under review.
What to have ready before your deadline
- FTA registration completed (TRN issued)
- Financial statements for the year — bookkeeping caught up, reconciled, supportable
- Any relief elections assessed and documented
- Related-party transactions identified, if any
- The return prepared and reviewed by an appropriately qualified professional
Records matter as much as the return itself: you must keep documentation adequate to support your filing if the FTA asks.
The common mistakes, ranked
From the cases that reach us: (1) not registering because "we're below the threshold," (2) missing the nine-month deadline because nobody mapped the financial year, (3) bookkeeping too incomplete to file from, discovered a month before the deadline, and (4) free zone companies assuming 0% without meeting qualifying conditions. All four are cheap to prevent and expensive to fix.
Not sure where your business stands?
A Qafeel tax professional will confirm your registration status, deadline and any reliefs you qualify for — free assessment, fixed quote before any work.
Get a free corporate tax assessment