B/F Balance

Hello Mr Chris,

For the following question why do we consider the 1st of Jan 20×8 as B/f balance even though it is in the same year ,

The following information relates to an entity:
(i) At 1 January 20X8 the carrying amount of non-current assets exceeded their tax written down value
by $850,000.
(ii) For the year to 31 December 20X8 the entity claimed depreciation for tax purposes of $500,000 and
charged depreciation of $450,000 in the financial statements.
(iii) During the year ended 31 December 20X8 the entity revalued a property. The revaluation surplus was
$250,000. There are no current plans to sell the property.
(iv) The tax rate was 30% throughout the year.
What is the provision for deferred tax required by IAS 12 Income Taxes at 31 December 20X8?
A $240,000
B $270,000
C $315,000
D $345,000

Answer:

135 D

$345,000

$’000
B/f 850
Year to 31.12.X8 (500 – 450) 50
Revaluation surplus 250
1,150
× 30% 345

it is confusing to me as I inteded to add all rise in deferred tax ( 15000+ 75000)
and adding the negative(255000)
so the total deferred tax is -165000

because I considered the B/f as a transaction in the same year ,

Thanks,