The concepts of inception and commencement both relate to the
start of a lease, but there are important differences, particularly
under IFRS.
SSAP 21 defines the
inception of a lease as the earlier of the time
the asset is brought into use and the date from which rentals first
accrue (paragraph 29).
IAS 17 (paragraph 4) distinguishes between inception and
commencement
Thus the SSAP 21 concept of inception is closer to the IAS 17
concept of commencement than it is to the IAS 17 concept of
inception.
IAS 17 provides that it is at inception that
However, the assets, liabilities, income or expenses resulting
from the lease, as appropriate, are not recognised until
commencement.
The need to distinguish between inception and commencement is
usually only significant where the leased asset takes a long time
to construct and the lease is entered into before the assert is
complete. The latter is quite common, particularly in ship leasing,
where the lease may be entered into (IAS 17
‘inception’) several years before the ship is available
to the lessee (IAS 17 ‘commencement’). Where provision
is made in a lease agreement to adjust for changes in the
construction or acquisition costs of the leased asset or changes in
some other measure of cost or value between inception and
commencement, such changes are deemed to have taken place at
inception.