Deferred tax

This scenario relates to three requirements.

After preparing a draft statement of profit or loss for the year ended 30 September 20X5 and adding the current year’s draft profit (before any adjustments required by notes (1) to (3) below) to retained earnings, the summarised trial balance of Kandy Co as at 30 September 20X5 is:

$’000
$’000
Equity shares of $1 each

20,000
Retained earnings as at 30 September 20X5

15,500
Proceeds of 6% loan note (note (1))

30,000
Investment properties at fair value (note (2))
20,000

Land ($5 million) and buildings – at cost (note (2))
35,000

Plant and equipment – at cost (note (2))
58,500

Accumulated depreciation at 1 October 20X4:

Buildings

20,000
Plant and equipment

34,500
Current assets
68,700

Current liabilities

43,400
Deferred tax (notes (2) and (3))

2,500
Interest paid (note (1))
1,800

Current tax (note (3))

1,100
Suspense account (note 2)

17,000

184,000
184,000

The following notes are relevant:

(1) The loan note was issued on 1 October 20X4 and incurred issue costs of $1m which were charged to profit or loss. Interest of $1·8m ($30m at 6%) was paid on 30 September 20X5. The loan is redeemable on 30 September 20X9 at a substantial premium which gives an effective interest rate of 9% per annum. No other repayments are due until 30 September 20X9.

(2) Non-current assets:
On 1 October 20X4, Kandy Co owned two investment properties. The first property had a carrying amount of $15m and was sold on 1 December 20X4 for $17m. The disposal proceeds have been credited to a suspense account in the trial balance above. On 31 December 20X4, the second property became owner occupied and so was transferred to land and buildings at its fair value of $6m. Its remaining useful life on 31 December 20X4 was considered to be 20 years. Ignore any deferred tax implications of this fair value.

The price of property has increased significantly in recent years and so the directors decided to revalue the land and buildings. The directors accepted the report of an independent surveyor who, on 1 October 20X4, valued the land at $8m and the buildings at $39m on that date. This revaluation specifically excludes the transferred investment property described above. The remaining life of these buildings at 1 October 20X4 was 15 years. Kandy Co does not make an annual transfer to retained profits to reflect the realisation of the revaluation gain; however, the revaluation will give rise to a deferred tax liability. The income tax rate applicable to Kandy Co is 20%.

Plant and equipment is depreciated at 12.5% per annum using the reducing balance method. No depreciation has yet been charged on any non-current asset for the year ended 30 September 20X5.

(3) A provision of $2·4m is required for income tax on the profit for the year to 30 September 20X5. The balance on current tax in the trial balance is the under/over provision of tax for the previous year. In addition to the temporary differences relating to the information in note (2), Kandy Co has further taxable temporary differences of $10m as at 30 September 20X5.
Please help in this question! I am unable to understand the movement of Deferred tax here.
The figures are
Opening bal (CR.) 2500
DTL on Temporary taxable difference- 2000
and DTL on revaluation of land and building – 6400
the answer is Increase by 500
please clarify why and how