By s. 7 of the Land Tax Management Act land tax at such??ates as may be fixed by any Act shall be levied and paid upon the unimproved value of all lands situated in New South Wales which are owned by taxpayers. Land tax is charged on land as owned at midnight on the thirty-first day of October immediately preceding the year for which the land tax is levied (s. 8) and the tax is payable by the owner of the land upon the taxable value of all the land owned by him and not exempt from taxation under the Act (s. 9). Provision is made by s. 12 requiring appropriate returns to be furnished by the owners of land and by s. 14 it is provided that the Commissioner shall from the returns and from any other information in his possession or from any one or both of those sources cause an assessment to be made of the taxable value of the land owned by any taxpayer and of the land tax payable thereon. Section 39 provides that land tax for each year shall be due and payable thirty days after service of the notice of assessment and s. 42 stipulates that any land tax shall be deemed, when it becomes due or is payable, to be a debt to Her Majesty. Finally s. 47 provides that land tax shall until payment be a first charge upon the land taxed in priority over all other encumbrances whatever. It, therefore, appears that land tax falls within the description appearing in the covenant - "all rates taxes duties burdens assessments and outgoings of every description" - and, certainly, that in the case of a lessor who owns only the land that is leased, the tax is one which, to adapt the words of the covenant, is both charged and imposed upon or in respect of the demised premises and upon the lessor in respect thereof. Moreover, it is so charged and imposed on the land as owned at midnight on 31st October immediately preceding the year for which it is levied and neither the charge nor the imposition waits upon the issue of an assessment pursuant to s. 39. "Assessment" in the context of the Act means no more than the ascertainment of the extent of a previously existing liability and the statutory provision (s. 39) that land tax for each year shall be due and payable thirty days after service of the notice of assessment does not mean that the liability is postponed until this has been done (cf. Church of England Property Trust, Diocese of Sydney v. Metropolitan Mutual Permanent Building and Investment Association Ltd. [1] ). These observations are sufficient to dispose of the objection that the notice of assessment had not, at the commencement of the action, been given in respect of the tax for the second year. They also dispose of the contention that, although the term of the appellant's lease was current on 31st October 1961, as that term ended 31st December 1961, the appellant was only liable to pay in respect of the land tax year 1961-1962 a ratable proportion of the tax charged or imposed upon or in respect of the demised premises or upon the lessor in respect thereof. But plainly this is not so. The tax upon the lessor is rated to the amount of land in his ownership at 31st October, and is levied as for the ensuing twelve months at the appropriate rates. Changes in his ownership during that year do not affect the tax charged or imposed, and the lessee's obligation is to pay the tax so levied or imposed.