For the 2018 tax year, most major platforms and government agencies provide "portable" access through responsive websites or mobile apps:
Redesigned Form 1040: 2018 was the first year the IRS used a redesigned, "postcard-sized" Form 1040, which replaced Forms 1040A and 1040EZ. wwwxx 2018 tax login portable
Lodge your tax return online with myTax - Australian Taxation Office 16 June 2025 — For the 2018 tax year, most major platforms
Recommendations:
If you are looking for a standalone or "portable" version of tax software to work on 2018 data without a constant internet connection, consider these options: Official Offline Utilities: For the 2018 tax year