How to Filter/Query database to show clients that have filed their 2018 but not come for 2019 taxes?

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Client explorer only allows filter/ query for a single year, so there is not a way to directly query multiple years. An option may be to filter the 2019 for returns not e-filed nor paper filed. This could then be compared to those e-filed or paper filed using a separate report for 2018.

Hope this helps