If you’ve made a mistake on your Self Assessment tax return, you can make an amendment or correction. You must do this by the year after the filing deadline for the tax year you’re amending. For example: For the 2016-17 tax year, you must make the change by 31 January 2019.

If you want to make changes after the original tax return has been filed, you must file an amended tax return using a special form called the 1040X, entering the corrected information and explaining why you are changing what was reported on your original return. You don’t have to redo your entire return, either.

What to do if your tax return is late?

If the return is less than a year old, the solution is simple: you can file your return as you usually would. Simply complete your taxes and mail them in. If you owe tax or if you are charged a penalty by the CRA for late tax filing, you will be notified.

What’s the penalty for not filing your taxes by the deadline?

By law, the IRS may assess penalties to taxpayers for both failing to file a tax return and for failing to pay taxes they owe by the deadline. The penalty for filing late is normally 5 percent of the unpaid taxes for each month or part of a month that a tax return is late.

How many previous years income tax return can be filed after due date?

For e.g. return for Financial Year 2012-13 can be filed till 31 st March 2015 and for the Financial Year 2013-14 return can be filed up to 31 st March 2016. But please note that, the return filed after the due date i.e. 31 st July or 30 th September is considered as Late Return of section 139 (4).

How to file previous years tax returns in Canada?

Simply complete your taxes and mail them in. If you owe tax or if you are charged a penalty by the CRA for late tax filing, you will be notified. If you would rather file your returns online, NETFILE remains open for many months after the deadline, so you can submit your taxes using that service.