With regard to your question no.4 below , advance tax is the amount of tax paid by us in advance which is for the financial year wise. This needs to be done mandatorily on various due dates during the financial year at a fixed percentage. This has been computed by computing the tax liability of the company for the financial year as a whole minus any advance tax or tax deducted at source as the case may be on each due date of payment of advance tax. This is required to be shown in our yearly Financials which is mandatory. This will be adjusted against provision for income tax of every year once the assessment order from Indian income tax department has been received.