How to check status of NC tax return?

Response I got from NCDOR --

Unfortunately there is no self-service type option yet available where a taxpayer can check the status of a non-refund tax return or return where the refund is credited to the next tax year.  The Department is currently working on a tax modernization upgrade, and this is one of the most requested options.  I suggest continuing to save all confirmation emails and payment records along with copies of the North Carolina tax return even if they are in digital format. 

 

Original post --

I've read about NC's Where's My Refund website, but how can I check if my NC return has been processed if I am not getting a refund?  I applied all of my 2025 overpayment towards 2026 estimated taxes and the NCDOR website doesn't like my entering zero as the expected refund.