저도 이런 경우 궁금해서 찾아 봤는데요...

퍼온곳 : http://www.cra-arc.gc.ca/changereturn

일단 밑에 설명 자세히 읽어보시구요.. 일단 제가 알기론 cra 단순 로그인으론 이런 정보는 고칠 수 없구요.. 링크건 곳에서 양식 다운받으신후 제출하시면 됩니다. 근데 net income 고치려면 notice of assessment라든지 페이스텁 이라든지... 소득을 증명할 자료랑 같이 제출하시면 제 경우엔 2달 정도 걸렸는데요.. 고쳐지고.. 그 사이에 CCTB가 적게 주어진건 나중에 한꺼번에 돌려주더군요. 이것 저것 복잡하게 안하시려면 가까운 회계사나 요즘 많이 하는 tax return 하는 곳에서 금방 합니다. 대신 자료는 가져가시구요. 비용은 일반 리턴이랑 비슷하게 받는데요.. 해보면 별것 아니라서 사실 비용이 아깝긴 합니다.^^



How to change your return

To make a change to any return you have sent us, do not file another return for that year. Wait until you receive your notice of assessment before requesting any change to a return. You can only request a change to a return for a tax year ending in any of the 10 previous calendar years. For example, a request made in 2014 must relate to the 2004 or a later tax year to be considered.

By Internet

You can make changes yourself to your return online. To access our electronic service, log on to My Account and select the Change my return option. Enter and submit any changes to your most recent return, or to your returns of the previous two years.

To change your address, see How to change your address.

By mail

Send both of the following to your tax centre separately from your return:
•a completed Form T1-ADJ, T1 Adjustment Request, or a signed letter providing the details of your request (including the years of the returns to be changed), your social insurance number, your address, and a telephone number where we can reach you during the day; and
•supporting documents for the changes you are requesting and, if you have not sent them to us before, supporting documents for your original claim.

The CRA processes most adjustment requests received electronically within two weeks, and most of those received by mail within eight weeks. However, it may take longer if any of the following situations apply:
•Your request is sent in late summer or fall when we receive a higher volume of adjustment requests.
•Your request is for a particular situation that needs more analysis or additional review.
•We need to contact you or your authorized representative for more information or documentation.

When we complete our review of your adjustment request, we will send you a notice of reassessment showing any changes to your return and a letter of explanation if we did not accept the changes you requested or if no changes were needed.

Forms and publications
•T1-ADJ, T1 Adjustment Request

답변 감사합니다~ 요렇게 한번 해봐야 겠군요~
이메일주신분도 감사드립니다~~