Line 15000 on a Canadian tax return refers to the total income before deductions, also known as gross income. It includes all earned income, such as wages or salary from employment, commissions, self-employment income, and other sources of income. Line 15000 is used to calculate the amount of tax due and your net income. To calculate the number on line 15000, you need to add the amounts from lines 10100, 10400 to 14300, and line 14700. It is important to declare your income and expenses to the CRA, and many lenders use this line to determine the amount of loan they can offer you. Some situations when the government, a bank, or another organization may need to know your total income or what’s listed on Line 15000 of your last tax return include determining child or spousal support payments, obtaining or refinancing a loan, and signing up or logging into your CRA My Account online.