If you filed your original tax return using CRA’s NETFILE service:
- Sign in to your online TurboTax account for the tax year you want to prepare an adjustment for.
- In Return Manager, select the ReFILE button beside the filed tax return you want to adjust.
If you printed and mailed your original tax return or are in a situation excluded from ReFILE:
- See the CRA’s How to change your return page for how to make an adjustment online in your CRA My Account or by mail.