Where to find LUT number?

Spooderman (Software developer) (14 Points)

12 May 2025  

My LUT is showing as DEEMED APPROVED but no LUT number - only ARN and Reference Number. Which one should I put on invoices?

Some sources say use ARN - https://www.indiafilings.com/learn/how-to-file-and-renew-your-lut/, while CAClubIndia forum thread says use LUT number - https://www.caclubindia.com/forum/lut-number-confusion-arn-or-reference-number-612656.asp .. but couldnt find this LUT number anywhere in the gst portal.

What's correct - ARN or Reference Number on invoices? Or where to find that LUT number 

Right now in my invoices i used the ARN number though , is that wrong ?