Social security should be deducted from wages for tax declaration.

Legal analysis: first, reduce social security and various expenses that need to be deducted from wages.

Reduce the tax threshold by 5000 yuan.

Personal income tax is deducted from the surplus salary in proportion.

Individual tax = (salary-social insurance premium-other expenses -5000)x corresponding proportion-quick deduction.

Legal basis: Article 2 of the Individual Income Tax Law of People's Republic of China (PRC), the following personal income shall be subject to individual income tax:

(1) Income from wages and salaries;

(2) Income from remuneration for labor services;

(3) Income from remuneration;

(4) Income from royalties;

(5) Operating income;

(6) Income from interest, dividends and bonuses;

(7) Income from property lease;

(8) Income from property transfer;

(9) Accidental income.

Individual residents who obtain income from items 1 to 4 of the preceding paragraph (hereinafter referred to as comprehensive income) shall calculate individual income tax according to the tax year; Non-resident individuals who obtain income from items 1 to 4 of the preceding paragraph shall calculate individual income tax on a monthly or itemized basis. Taxpayers who obtain income from items 5 to 9 of the preceding paragraph shall calculate individual income tax separately in accordance with the provisions of this law.