ROI on a fit-out: amortising AED 400,000 of joinery across a five-year lease

Key Takeaways

• Capitalised fit-out costs, including joinery, are amortised over the shorter of their own useful life or the remaining lease term, not automatically over the full lease period.
• That amortisation period can be extended into renewal periods, but only if the renewal is reasonably assured, such as when a bargain renewal option genuinely makes extension likely, not simply possible.
• UAE corporate tax follows the business's own IFRS accounting treatment for fixed assets, so the amortisation schedule used in the books is also the schedule used for the tax deduction, there is no separate statutory fit-out depreciation table to check against.
• On AED 400,000 of joinery amortised over a straight five-year lease term with no renewal assumed, the annual charge is AED 80,000, a number that changes materially, and is easy to get wrong, if the actual useful life of the joinery differs from the lease term.

AED 400,000 spent on joinery for a five-year lease doesn't automatically amortise over five years, it amortises over the shorter of the joinery's own useful life or the lease term, and that distinction changes the annual charge, the ROI calculation, and the corporate tax deduction all at once.

The rule: shorter of useful life or lease term, not just the lease term

Capitalised leasehold improvements should be amortised over the shorter of their useful life or the remaining term of the lease (AccountingTools, accounting for leasehold improvements, retrieved 2026-09-08). If the joinery itself has a genuine useful life of, say, seven years, but the lease is five years, the amortisation period is five years, the shorter of the two. If instead the joinery has a useful life of only three years (lower-grade materials, high-wear application), the amortisation period is three years even inside a five-year lease, front-loading the annual charge into fewer, larger increments rather than spreading it flat across the full term.

Getting this backwards, defaulting to the full lease term without checking the asset's actual useful life, either overstates the asset's remaining book value in later years (if useful life is genuinely shorter) or artificially compresses the charge into too few years (if useful life is genuinely longer, though the lease term still caps it at five in this case).

When the amortisation period can extend beyond the initial lease term

The period isn't rigidly capped at the current lease term in every case: it can be extended into additional renewal periods if the renewal is reasonably assured, for example when a bargain renewal option makes extension a near-certainty rather than a mere possibility (AccountingTools, retrieved 2026-09-08). This is a judgment call with a specific bar: "reasonably assured" is a higher standard than "the business intends to renew if things go well." A business planning fit-out ROI around an assumed renewal that isn't actually locked in or economically compelling is amortising over a period the accounting standard doesn't yet support, and risks a restated schedule if the renewal doesn't happen.

The UAE-specific link between accounting treatment and tax deduction

For UAE businesses, corporate tax treatment of fixed assets follows the business's own IFRS accounting treatment directly, the rate and schedule used in the books is the rate and schedule used for the tax deduction, rather than a separate statutory depreciation table the business must also reconcile against (Paci Finance, UAE fixed assets accounting and corporate tax treatment, retrieved 2026-09-08). This has a direct practical consequence: the useful life judgment made for the fit-out isn't just a bookkeeping decision, it's the number that determines how quickly the AED 400,000 becomes tax-deductible. A shorter, well-supported useful life accelerates the tax deduction; an artificially long one defers it, with no separate mechanism to correct the timing later.

UAE businesses can use shorter useful lives than a generic international default where there's genuine commercial justification, provided that justification, materials, usage intensity, industry norms for similar fit-outs, is documented, not simply asserted (Paci Finance, retrieved 2026-09-08).

Working the AED 400,000 example

On a straight five-year lease, with the joinery's useful life genuinely matching or exceeding the lease term (a common, defensible position for quality joinery in a standard commercial fit-out), amortisation runs AED 400,000 ÷ 5 = AED 80,000 per year. That AED 80,000 annual charge is what feeds into both the ROI calculation for the fit-out itself and the annual corporate tax deduction. Run the actual capital cost and expected lease term through the ROI calculator to see how this annual charge compares against the operational value the fit-out is expected to generate, higher retail conversion, improved productivity, or reduced turnover in the improved space, whichever benefit case justified the spend in the first place.

If the lease includes a reasonably assured renewal option extending the effective term to, say, eight years, and the joinery's useful life supports that longer period, the annual charge drops to AED 400,000 ÷ 8 = AED 50,000, a materially different number that changes both the reported annual cost and the pace of the tax deduction. This is exactly why the useful-life-versus-lease-term judgment needs to be made explicitly and documented, rather than defaulted to whichever number is administratively convenient. Getting a documented, defensible useful-life figure before the joinery is even installed is a scoping conversation worth having directly with an engineering fit-out specialist, since they're the ones who can put real materials and wear assumptions behind the number an auditor might later query.

Frequently asked questions

If my lease is five years, does my fit-out always amortise over exactly five years?

Only if the fit-out's own useful life is five years or longer. If the useful life is shorter, amortisation follows the shorter period. If a renewal is reasonably assured (not merely hoped for), the period can extend beyond the initial five years, provided the fit-out's useful life supports the longer period too.

Does UAE corporate tax use a different depreciation schedule than my accounting books?

No. UAE corporate tax treatment follows your IFRS accounting treatment directly for fixed assets, so the useful-life and amortisation judgment made in the books is the same one that determines the tax deduction timing, there's no separate statutory table to reconcile against.

Can I use a shorter useful life than what's typically assumed for similar fit-outs, to accelerate the deduction?

Yes, provided there's genuine commercial justification, materials quality, intensity of use, industry-specific wear factors, documented rather than simply asserted for tax timing convenience. An undocumented shortened useful life is the kind of judgment an auditor or tax authority would query.

The bottom line

AED 400,000 of joinery amortising over "the lease term" is only correct if the joinery's actual useful life is at least that long, and the assumption needs to be checked, not defaulted to. Since UAE corporate tax follows the accounting treatment directly, the useful-life judgment made for the fit-out isn't just a presentation choice, it's the number that sets both the annual reported cost and the pace of the tax deduction for the life of the asset.

Figures were verified on 8 September 2026 against published leasehold improvement accounting and UAE fixed asset tax treatment guidance. Useful life determinations depend on the specific materials, usage, and commercial context of each fit-out; confirm your specific amortisation schedule with your accountant before finalising the treatment.