This is what we do as well. We use TSheets for employees to track time by job and class. Time is exported to QBO but in some cases the fractions of hours are calculated differently.

For example, an employee tracking 35 hours 53 minutes would show up as follows:

Tsheets Payroll report and job costing report: 35.88

QBO payroll detail preview report: 35.8 8 3 3 3 3 3 3 3 3  (see note below)

QBO payroll detail report (after submitting payroll): 35.88

After speaking with both QB and Tsheets support, there doesn't appear to be a workaround other than:

A - Automatically round hours to the nearest 15 minute increment

B - Be sure to run the payroll detail preview report in QBO. This report is only available after starting payroll but before submitting it. The report link can be only accessed at the bottom of the page just before clicking on Submit.

C - Spend lots of time later figuring out why your reports don't match.

When it comes time for workers compensation audits you need reports that match or an explanation as to why they don't.  It would be great if we didn't have to pay for a third party module to manage split class codes or at least have an option to reprint the payroll detail preview report after payroll is submitted.

NOTE: Sorry for the number format.  QB would not allow me to post the actual multidecimal number for some reason. [The message body contains (the number above with multiple decimal places), which is not permitted in this community. Please remove this content before sending your post.]