While you cannot use the standard "e-file" buttons for 2018 returns, the IRS still accepts prior-year returns.
If you are cleaning out an old iPad or Android device from 2018 and find the icon, security experts have a clear message: Do not open it.
To file for 2018, you must specifically download or access the of the software.
The service went dark on April 17, 2018—the day after Tax Day—with no forwarding address. wwwxx 2018 tax app
Unfortunately, the app is remembered today not for its features, but for its failure. According to archived Reddit threads from April 16, 2018, the backend servers hosting the wwwxx app were misconfigured.
Keep in mind that these features may have changed since the 2018 version, and it's always a good idea to review the current version's features and pricing before using the software.
Do you have a dusty old phone with the wwwxx app still installed? Do not plug it into your computer. Contact a data destruction service. While you cannot use the standard "e-file" buttons
You cannot use the current version of any tax software (TurboTax, H&R Block, TaxSlayer, etc.) to file a 2018 return. Tax laws change every year, and software is updated annually to reflect those changes.
TurboTax is a popular tax preparation software, and here are some good features about the 2018 version:
Because the developer used the subdomain wwwxx.[redacted].com , they failed to secure the API endpoints. Security researchers discovered that by simply changing a number in the URL ( /user/1234/taxform to /user/1235/taxform ), you could view another person’s partially completed tax return. The service went dark on April 17, 2018—the
If you are filing 2018 taxes because you are owed a refund, pay close attention to the .
For users looking to file for the 2018 tax year or manage prior-year returns, several platforms consistently rank highly:
Published: April 14, 2026
Market research from that period suggests the app offered three distinct features: