As per CRA- 

Make sure the number is accurate so that the CRA can apply for your payment correctly.

1. Sign in to your financial institution's online banking service for individuals.
2. Under "Add a payee" look for an option such as:
   • CRA (revenue) – current-year tax return
     • Use this option to make a payment for your current tax return. You can use this option only once per return.
   • CRA (revenue) – tax amount owing
     • Use this option to pay any amount owing.
   • CRA (revenue) – tax installment
     • Use this option to make payments toward the future tax year.
3. Enter your 9-digit social insurance number as your CRA account number.

• Participating financial institutions

• ATB Online
• BMO
• Canadian Western Bank
• CIBC
• Desjardins
• EQ Bank
• HSBC
• KEB Canada
• Laurentian Bank
• National Bank
• President’s Choice
• RBC Royal Bank
• Scotiabank1
• Tangerine
• TD Canada Trust
• Alberta Credit Unions1
• Atlantic Canada Credit Unions1

1 These financial institutions also provide non-resident payment options.