Bookkeeping for Construction Companies in UAE: Job Costing, WIP, Retentions and Penalties

Which construction companies need tax-ready books in the UAE?

All of them: every contracting company, mainland or free zone, registers for Corporate Tax and files a return each year, and almost every active contractor passes the AED 375,000 VAT threshold. The size of your projects decides the extra obligations.

How does job costing work for a UAE contractor?

Job costing gives every project its own code, and every cost that can be traced to a site is charged to that code: materials, labour hours, subcontractors, plant time and site overheads. Head office rent and admin salaries stay out of job costs and are reported separately.

Each month, compare cost to date with budget and ask the project manager for an updated cost to complete. That single figure drives the revenue calculation in the next section, so a stale estimate misstates profit.

How should WIP, progress billing and retentions be recorded?

Contract revenue is recognised as work progresses, commonly by comparing cost incurred with total estimated cost, and the difference from what you have certified sits on the balance sheet as a contract asset or liability. Waiting for certificates to be paid before booking revenue distorts both profit and tax.

An illustrative stage-of-completion calculation

If the estimate shows a contract will make a loss, the whole expected loss is recognised straight away rather than spread over the remaining months. The accounting standard behind this is covered in revenue recognition for UAE SMEs.

Retentions on both sides of the contract

Your client holds back part of each certificate until completion and the defects period end; that is a retention receivable, still revenue already earned, not a bad debt. You hold back part of each subcontractor’s payment in turn, which is a retention payable. Track both by project with release dates, and note that the VAT timing on retained amounts has its own rules, explained in our UAE construction VAT guide.

How do you control subcontractor payments, site petty cash and plant?

Pay subcontractors only against a certified valuation, run site cash through a fixed float with vouchers, and keep every excavator, scaffold set and generator in a plant register. These three areas are where contractors lose the most money without noticing.

Subcontractors

Each payment should trace to a measured valuation, less retention and any back-charges for materials or rework you supplied. VAT-registered subcontractors must issue a tax invoice within 14 days of the supply, and without one your input VAT claim is exposed.

Site petty cash

Give each site engineer a fixed float, replenish it weekly only against vouchers with receipts, and code each voucher to the project. The petty cash management guide has a voucher format that holds up.

Plant and equipment register

Record cost, purchase date, current site, depreciation and disposal for each item, and charge plant hours to projects. Guidance on useful lives and disposals is in UAE fixed assets accounting.

What is the monthly close routine for a construction company?

A contractor’s close brings site paperwork into project ledgers, updates each job’s percentage complete and locks the month within 10 working days. The VAT 201 each quarter and the Corporate Tax return each year are then drawn from those locked project figures.

What documents must a contracting company keep?

Keep contract and site records for at least 7 years; a dispute or FTA review on a long project can reach back several periods.

• Main contracts, variation orders and client correspondence on scope
• Interim payment certificates and tax invoices issued
• Subcontract agreements, valuations and subcontractor tax invoices
• Delivery notes, purchase orders and supplier invoices
• Site timesheets, payroll files and petty cash vouchers
• Plant register, log sheets and disposal records
• Cost-to-complete schedules and year-end WIP workings

Which dates should contractors plan around?

For December year ends, 30 September 2026 is the Corporate Tax return and payment date; VAT and e-invoicing dates follow.

Need the return handled as well? Have your Corporate Tax return prepared and reviewed by the same team that keeps the books.

What penalties apply when a contractor's books fall short?

Missing records cost AED 10,000 for a first failure, and incomplete project books tend to produce late or incorrect returns with separate penalties.

A realistic stack: site petty cash of several hundred thousand dirhams with no receipts fails the records test (AED 10,000), three certificates were never invoiced (3 x AED 2,500 = AED 7,500), and the VAT return that missed them is incorrect (AED 500). That is AED 18,000 before the unpaid VAT itself.

6 accounting mistakes construction owners make

• One P&L for all projects. Loss-making jobs stay hidden, estimates are never tested, and WIP at year end is guessed.
• Site petty cash with no receipts. Unsupported spending cannot be defended, which invites the records penalty and weakens deductions.
• Revenue booked only when certificates are paid. Profit swings between years and the CT return rests on the wrong income.
• Retentions forgotten. Receivables are written off by mistake or never chased after the defects period.
• Paying subcontractors without tax invoices. Input VAT claimed without a valid invoice is exposed on review.
• Variations worked but never certified. Work done without paperwork is revenue and VAT that never reach the books.

The wider list is in UAE bookkeeping errors and fixes.

How can a contractor avoid FTA penalties?

• Weekly: site petty cash replenished only against receipted vouchers
• Monthly: separate business bank account reconciled, with receipts matched to certificates
• Monthly: project cost reports, cost to complete and WIP posted within 10 working days
• Monthly: subcontractor valuations matched to tax invoices before payment
• Quarterly: accountant review of certificates and VAT before the 28th
• Annually: plant register verified and year-end WIP schedule signed off by project managers
• Always: records kept 7 years and translatable into Arabic on request

Already late, dormant or facing an FTA notice?

For a contractor, catch-up starts by rebuilding each project from contracts, certificates and bank records, because the tax figures depend on project-level WIP.

1. Rebuild project ledgers and agree opening WIP, retentions and VAT balances using our catch-up bookkeeping guide.
2. File overdue returns without waiting for perfect figures; see what to do after missing the CT deadline. A company that never traded still files, as explained in nil Corporate Tax returns.
3. Correct understated VAT through a voluntary disclosure: 1% a month on the difference before an audit notice, or 15% plus 1% a month once one has arrived.
4. Challenge a penalty through reconsideration within 40 business days, then the Tax Disputes Resolution Committee, using the reconsideration guide.

Worked example: a fit-out contractor with no project ledgers

An illustrative Sharjah fit-out and MEP contractor had AED 7.8M revenue in 2025 across nine projects, a December year end and one company-wide P&L. After WIP and retentions are rebuilt, taxable income is AED 1,150,000.

The rebuild also showed two of the nine projects were loss-making from month three, which a monthly job cost report would have caught.

In-house, freelancer or accounting firm for construction books?

Contractors with one or two jobs can manage with an in-house clerk, but WIP, retentions and cost-to-complete reviews need someone who understands contract accounting.

Read what to check when outsourcing bookkeeping, then see how our accounting and bookkeeping service handles project ledgers.

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