Income minus expenditure equals profit.

Other basic calculation methods of profit:

Operating profit = operating income-operating costs-business taxes and surcharges-sales expenses-management expenses-financial expenses-asset impairment loss+fair value change loss (-fair value change loss)+investment income (-investment loss).

Operating income: refers to the total income recognized by various businesses of an enterprise, including main business income and other business income.

Operating costs: refers to all the actual costs incurred by an enterprise in operating its business, including the main business costs and other business costs.

Asset impairment loss: the loss caused by the enterprise's provision for asset impairment.

Gains (or losses) from changes in fair value: gains (or losses) from changes in fair value that should be included in current profits and losses, such as trading financial assets of enterprises.

Investment income (or loss): the income (or loss) obtained by enterprises investing abroad in various ways.

Total profit = operating profit+non-operating income-non-operating expenditure.

Non-operating income: various interests that are not directly related to the daily business activities of an enterprise.

Non-operating expenses: losses incurred by an enterprise that are not directly related to its daily business activities.

Net profit = total profit-income tax expense.