QB Issue Resolution:

You can easily access your P60s by heading on over to the Employees page. Just click on the Reports tab, and change the year to 2015-16 to access your reports from the last tax year.

Resolution for Issue 'Can I access P60s after I have advanced the payroll?' available: Yes (Solved).
Source: Intuit Community forum.

Can I access P60s after I have advanced the payroll?: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Employees page
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Error Recovery for Employees page [Canada]
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Additional Support Options: