Child allowance shall be deducted only if the child is less than 25 years old and is still studying in a university or an equivalent educational institution or is a minor and an adjudged incompetent or quasi-incompetent person, and is under the taxpayer’s maintenance and support. However, no allowance shall be deducted for a child who has, during the tax year concerned, assessable income of 15,000 Baht or more which does not fall under Section 42.