Yes, if there is a taxable income, you have to pay the tax in that year of assessment and based on the current year's taxable income for calculating the next year's provisional salaries tax. As every taxpayer has different situation, I suggest you check to the table below for allowances and deductions.
Allowances, deductions and tax rates table
http://www.ird.gov.hk/eng/pdf/pam61e.pdf
Information pamphlet for the first time taxpayer issued by IRD
http://www.ird.gov.hk/eng/pdf/pam43e.pdf