File Extension Library

.TT18 File Extension

  • Developer by: Intuit
  • Category: Data Files

What is an .TT18 file?

.TT18 file extension is created by Intuit. .TT18 has been classified as Data Files.

.TT18 is TurboTax Canada 2018 Tax Return

A TT18 file is a tax return created by the 2018 version of TurboTax Canada, a program used to file tax returns. It contains tax data, which includes Canadian federal and provincial tax information and personal data entered by the user. TT18 files are most commonly created and used in 2019 between January and April.

TurboTax Canada 2018 automatically creates the TT18 file when you save your tax return. It stores your tax return progress, which allows you to close and reopen your tax return. Typically, the file is used for the following purposes:

  • Saving a 2018 tax return to be electronically filed or printed to be mailed.
  • Backing up a tax return in case of the loss or corruption of a tax return.
  • Importing 2018 tax data into the 2019 version of TurboTax Canada to fill out a 2019 tax return.

Tax return file extensions used by TurboTax Canada reflect the year of the tax data they contain. Tax returns for the 2017 year use the .TT17 extension, returns for the 2016 year use the .TT16 extension, and so on.

In Windows, TT18 files are saved by default in the following location:


NOTE: The U.S. version of TurboTax 2018 saves files with a .TAX2018 file extension.

List of all softwares that can open the TurboTax Canada 2018 Tax Return
Intuit Canada TurboTax

How to Open .TT18 file on different platforms

Open .TT18 File on Windows

  • Right-click a .TT18
  • Left-click "Open With" > "Choose another app"
  • Select the program that opens .TT18 file and Select check box "Always use this app to open .TT18 files" Press "Ok"

Open .TT18 File on Mac

  • Right-click (or Ctrl + Left-click) the .TT18 file
  • Click "Open With" > "Other.."
  • Then choose another program from the app list and press "Open"
  • Select check box "Turn on" for "Always open in app"

Open .TT18 File on Linux

Right click on the .TT18 file, choose "Open with" and select a program from the list above

Open .TT18 File on iPhone

Select a file. If you don't see an application to open the .TT18 file, tap "Share" and choose the right app.
Method 2
Save the file. Then open the app «Files». Touch and hold the file, then release your finger. You will see a black menu bar. After that tap "Share" and select an application.

Open .TT18 File on Android

Tap the Settings icon on an Android smartphone, then select «Applications». Click the Settings icon in the upper right corner of the screen, to change the default apps.
If you want to open, edit, save or even convert .TT18 files on Android, then your best bet is to download one of the dedicated apps available on Google Play.

How to fix problems with .TT18 files

  1. You need to update the application that you normally use to open .TT18 files. Only the latest version of the software supports the current .TT18 file format
  2. You need to check the .TT18 file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)