legal ground
Article 5 of the Interim Measures for Special Additional Deduction of Individual Income Tax
The expenses related to the taxpayer's children receiving full-time academic education shall be deducted according to the standard of 1000 yuan per child per month.
Academic education includes compulsory education (primary school, junior high school education), high school education (ordinary high school, secondary vocational education, mechanic education) and higher education (junior college, undergraduate, master's and doctoral education).
The provisions of the first paragraph of this article shall apply to children who have reached the age of 3 and are in the pre-school education stage before entering primary school.