可以答你arguable
用Home Loan Interest Q17 來講:
https://www.ird.gov.hk/eng/faq/hli.htm
A second charge, a re-mortgaged loan or an overdraft account
17.
Q:
Is home loan interest paid on a second charge, a re-mortgaged loan or an overdraft account tax deductible?
A:
The point to consider is whether the loan obtained is directly applied for acquisition of the claimant's dwelling. For example:
(i) The claimant, in addition to obtaining a bank mortgage loan on 70% of the cost of his dwelling, is further granted a second mortgage loan by the developer of the property, the developer being one approved by the Commissioner of Inland Revenue under s.26E(9) of the Inland Revenue Ordinance. In such case, subject to the maximum limit under sections 26E(2)(a)(ii) and 26E(2)(c), interest paid on both loans are deductible for tax purposes.
(ii) If the claimant re-mortgaged his property and used the borrowed money to purchase shares, the interest paid on the re-mortgaged loan is not tax deductible. However, if the re-mortgaged loan was used to repay the original loan which was executed for acquisition of his dwelling so as to enjoy a lower interest rate, the portion of loan interest paid, pro-rata to the outstanding balance of the original loan, is tax deductible.
(iii) Home loan interest paid on bank overdraft account is deductible if the money borrowed is directly used for acquisition of his dwelling and the overdraft facility is secured by a mortgage/charge over the dwelling or any other property in Hong Kong. If the bank overdraft account is used partly for purposes other than for acquisition of the dwelling, the amount of deductible home loan interest would be reduced accordingly.