v3.23.3
Cover - USD ($)
 12 Months Ended
Sep. 30, 2023
Dec. 08, 2023
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Sep. 30, 2023    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Current Fiscal Year End Date --09-30    
Entity File Number 000-56293    
Entity Registrant Name Coretag Holdings, Inc.    
Entity Central Index Key 0001624140    
Entity Tax Identification Number 35-2515740    
Entity Incorporation, State or Country Code NV    
Entity Address, Address Line One 7325 Oswego Road    
Entity Address, City or Town Liverpool    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 13090    
City Area Code (315)    
Local Phone Number 451-7515    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company true    
Entity Public Float     $ 25,000,000
Entity Common Stock, Shares Outstanding   225,000,000  
Document Financial Statement Error Correction [Flag] false    
Auditor Name GreenGrowth CPAs    
Auditor Location Los Angeles, California    
Auditor Firm ID 6580