Welcome to the Community and thanks for choosing us for your accounting software!

You’ll be happy to know that you can seamlessly enter historical data from 2016 to 2017 in QuickBooks Online. Your transactions will be automatically sorted by dates.

You might also want to check out this article for more information: 

Resolution for '20172018 issue: 'Now I have set up my account, can I use this to do my accounts for 2016-2017 tax year? Or can I only use it for this upcoming tax year 2017-2018?' available: Yes.

The 20172018 issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the 20172018 issue yourself by looking for a resolution described in the article. If it is a complex 20172018 issue or you are unable to solve the issue, you may contact us by clicking here or by using other 20172018 support options.

For more information about resolving issues related to 20172018 in Quickbooks/QBO or to get support for the issue 'Now I have set up my account, can I use this to do my accounts for 2016-2017 tax year? Or can I only use it for this upcoming tax year 2017-2018?', click the link below: