First alternative for half year tax calculation for FY15 is to use 50% of corporate income tax amount for FY14 (Actual amount) for the prudence method of the case of underestimated half year tax incurred, FICO still has a reasonable excuse (please see below for your information for reasonable excuse). Tax liability amount is xxxx baht. Corporate income tax liability for FY14 was 1,798,748.08 baht and 50% of FY14 corporate income tax liability equates to 899,374.00 baht.