The preparation of the financial statements requires management to make judgements, estimates and assumptions that affect the reported amounts in the financial statements. Management continually evaluates its judgements and estimates in relation to assets, liabilities, contingent liabilities, revenue and expenses. Management bases its judgements, estimates and assumptions on historical experience and on other various factors, including expectations of future events, management believes to be reasonable under the circumstances. The resulting accounting judgements and estimates will seldom equal the related actual results. The judgements, estimates and assumptions that have a significant risk of causing a material adjustment to the carrying amounts of assets and liabilities (refer to the respective notes) within the next financial year are discussed below.

Provision for impairment of inventories
The provision for impairment of inventories assessment requires a degree of estimation and judgement. The level of the provision is assessed by taking into account recent sales experience, the ageing of inventories, damaged, obsolete, slow moving inventories and other factors that affect inventory obsolescence.

Estimation of useful lives of assets
Hearing Australia determines the estimated useful lives and related depreciation and amortisation charges for its property, plant and equipment and finite life intangible assets. The useful lives could change significantly as a result of technical innovations or some other event. The depreciation and amortisation charge will increase where the useful lives are less than previously estimated lives, or technically obsolete or non-strategic assets that have been abandoned or sold will be written off or written down.

Employee benefits provision
The liability for employee benefits expected to be settled more than 12 months from the reporting date are recognised and measured at the present value of the estimated future cash flows to be made in respect of all employees at the reporting date. In determining the present value of the liability, estimates of attrition rates and pay increases through promotion and inflation have been taken into account, based on actuarial assessments. The last actuarial assessment was in July 2018.

Restoration obligations
A provision has been made for the present value of anticipated costs for future restoration of leased premises. The provision includes future cost estimates associated with vacating of premises. The calculation of this provision requires assumptions such as the exit date and cost estimates. The provision recognised is periodically reviewed and updated based on the facts and circumstances available at the time. Changes to the estimated future costs are recognised in the statement of financial position by adjusting the asset and the provision. Reductions in the provision that exceed the carrying amount of the asset are recognised in profit or loss.

Refund liability
A refund liability has been created to provide for expected returns of products sold to customers and for expected correction of claims under the government voucher program. The calculation of this liability is based on management's estimate.