From 1 January 2026, the Periodic Review 2024 amendments to FRS 102 came into effect, bringing UK GAAP closer to international standards.
While much of the focus naturally sits on the accounting changes, the corporation tax implications are just as important. In many cases, it’s not the numbers themselves that create complexity, it’s the timing of when those numbers are recognised.
And that’s where the real impact sits.
Revenue recognition: a shift in timing, not just presentation
One of the most significant changes is the introduction of a five-step revenue recognition model, aligned with IFRS 15.
This particularly affects businesses with more complex revenue streams. For example, those offering bundled goods and services, warranties, or charging non-refundable upfront fees.
The key point is simple: revenue may now be recognised at a different point in time.
Because taxable profits are based on accounting profits, any shift in revenue timing will directly affect the tax position. What was previously recognised later may now be brought forward, or vice versa.
On transition, businesses may need to restate prior periods or adjust opening reserves. From a tax perspective, the general rule is that the net transitional adjustment is brought into account in the first period of adoption.
This creates several practical considerations. Income must only be taxed once, and relief for expenditure should only be obtained once. Getting this wrong risks either overpaying tax or creating future complications.
For some businesses, the impact could be significant. An increase in taxable profits may trigger Quarterly Instalment Payments for the first time, accelerating when tax becomes payable. In some cases, payments could fall due much earlier than expected, creating additional pressure on cash flow.
There are also implications for the use of carried-forward losses. Where profits increase beyond the £5m annual allowance, loss utilisation becomes restricted to 50% of the excess. The result is that businesses may face a corporation tax liability that would not have arisen under the previous accounting treatment.
Lease accounting: bringing obligations onto the balance sheet
The changes to lease accounting are equally significant.
The distinction between operating and finance leases has been removed. Most leases will now be recognised on the balance sheet as a right-of-use asset, alongside a corresponding lease liability.
Instead of rental expenses, businesses will now recognise depreciation on the asset and interest on the liability within the profit and loss account.
From a corporation tax perspective, this represents a shift in how deductions arise. Previously, operating lease payments were treated as a rental expense and deducted in full. Under the new model, relief may instead be obtained through depreciation and interest expense.
Leased assets will only qualify for capital allowances where they are acquired under hire purchase arrangements or similar leases that provide for a transfer of ownership and include a capital element.
This means businesses will need to take greater care in how leased assets are tracked. In practice, this may require maintaining separate records for leased assets that do not qualify for capital allowances, ensuring the correct tax treatment is applied.
It is also important to look beyond the headline numbers. Right-of-use assets can include costs that need to be considered separately for tax purposes, such as lease premiums, stamp taxes, fit-out costs and dilapidation provisions. Some of these costs, including lease premiums and SDLT, will continue to be non-deductible and must be treated accordingly.
On transition, any one-off adjustment is not taxed immediately. Instead, it is spread over time, broadly in line with the remaining lease term. This introduces timing differences between accounting and tax, which in turn brings deferred tax into sharper focus.
Corporate interest restriction: additional complexity to manage
The move to recognising lease liabilities on the balance sheet will typically increase interest expense in the accounts, as lease payments are unwound over time.
While this interest is generally deductible, businesses need to consider the Corporate Interest Restriction (CIR) rules. Where total net interest expense exceeds the £2m de minimis threshold, restrictions may apply.
However, the legislation distinguishes between different types of leases. Interest arising on leases that would previously have been classified as operating leases is excluded from CIR calculations. In contrast, finance lease interest remains within scope.
This creates an additional layer of complexity. Businesses, particularly larger groups, will need to ensure that lease-related interest is appropriately identified and tracked to support accurate CIR calculations.
Wider implications: not just accounting, but thresholds and compliance
Beyond revenue and leases, the changes to FRS 102 have broader tax implications.
Changes to accounting figures may affect key thresholds. Turnover and gross assets are used across a range of tax regimes and compliance requirements, including audit thresholds, SEIS/EIS, EMI schemes, Transfer Pricing thresholds, and eligibility for certain reliefs.
As a result, businesses may find themselves subject to new obligations or losing access to reliefs, despite no underlying change in commercial activity.
The practical reality
These changes are not just technical adjustments to accounting standards.
They affect when profits are recognised, when tax is paid, and how reliefs are accessed.
In practice, that means:
- Tax liabilities may arise earlier than expected
- Cash flow profiles may change
- Compliance requirements may increase
And in some cases, all three will happen at once.
The key takeaway
FRS 102 is evolving, and with it, the tax landscape.
The rules themselves may not have fundamentally changed, but the way they apply, particularly around timing, has.
Understanding the impact early is critical. Transitional adjustments, payment timings, and wider tax implications all need to be assessed in the round.
Because this isn’t just about staying compliant.
It’s about having clarity, avoiding surprises, and making informed decisions as the rules change around you.
