Is your T4 accurate, or have you noticed an error? 2018 T4’s have been issued so make sure you have received yours. All your other tax slips will be arriving in the mail as well so keep an eye out as they easily get lost in all the junk mail. If you subscribe to electronic mail you should retrieve them from the website. A T4 slip summarizes the money paid to you during a calendar year, including amounts deducted at source; these amounts are paid directly to the government. Th