Ondaviel Aquaculture: deferred tax on a lease and a dismantling obligation, from commencement to the tax loss (N → N+2)

On 1 January N, Ondaviel Aquaculture leases the H2 farming hall at Plouvenec and commissions, on its own plot of land, lagooning basins that its operating permit requires it to dismantle after eight years. Two transactions with no effect on profit at the date they are recognised, but which give rise to temporary differences. You follow the file over three years: measurement of the lease, the provision and the deferred taxes at the commencement date (N); the N closing; a cut in the tax rate enacted in N+1; a tax loss in N+2, the assessment of the deferred tax asset and a draft note. At each step, the central question is: which standard does what? All figures are case data; the tax law (rates, deductibility, tax bases, carry-forward of losses) is case data, never an IFRS rule; teaching assumptions and professional judgements are flagged as such, and no method or rate chosen by Ondaviel is presented as required by the standards. Teaching assumptions: present values calculated with an exact discount factor and rounded once to the euro; interest and unwinding for each year equal to the opening balance × rate, rounded to the euro, with calculations chained on the rounded amounts; straight-line depreciation rounded to the euro (last year adjusted); each deferred tax asset or liability equal to the temporary difference × rate, rounded to the euro; a single taxation authority.

Standards involved: IFRS 16 Leases (lease liability and right-of-use asset for the hall), IAS 37 Provisions, Contingent Liabilities and Contingent Assets (obligation to dismantle the basins; its inclusion in the cost of the basins comes from IAS 16) and IAS 12 Income Taxes (deferred taxes). Measure the amounts at the commencement date, choose the rates, classify the temporary differences, decide whether the initial recognition exception applies and record the entry at 1 January N.