The Canadian tax filing deadline for the 2026 tax year is April 30, 2027 for most individual filers. If you or your spouse is self-employed, you have until June 15, 2027 to file your return - but any tax you owe is still due April 30, 2027. Filing late when you owe taxes triggers an automatic 5% penalty on the balance owing, plus 1% for every additional month your return is late, up to a maximum of 12 months. If you cannot pay the full amount, file anyway to avoid the late-filing penalty, then arrange a payment plan with CRA. The deadline applies to NETFILE, paper filing, and any tax software certified by CRA. Mark April 30 in your calendar and aim to file early to get any refund faster.