QB Issue Resolution:

You are correct, it shouldn’t be 2016 income, it should be a 2016 “uncollectible debt” expense. This will automatically adjust the retained earnings.
It doesn’t matter when the debt became uncollectible – you have to put it in the current year, because the previous year’s books are closed.

Resolution for Issue 'If I write off invoices for 2013, shouldn’t it be an adjustment to retained earnings, instead of 2016 income?' available: Yes (Solved).
Source: Intuit Community forum.

If I write off invoices for 2013, shouldn’t it be an adjustment to retained earnings, instead of 2016 income?: 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 2013
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!

Error Recovery for 2013 [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.

Get 50% off Quickbooks Online

Click Here for 50% off!

Additional Support Options: