Format Validator · City Code Decoder · TDS Compliance
TAN Number Decoder
Validate TAN format, decode the city code from the first 3 characters, and understand TAN structure for TDS/TCS compliance.
Enter TAN Number
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Note: This validates TAN format only. To verify TAN status or search by name, use the official portals below.
TAN Format Explained
Structure: AAABNNNNNC
Pos 1–3
City/AO Code — First 3 letters indicate the city or Assessing Officer (AO) jurisdiction. E.g. DEL = Delhi, MUM = Mumbai.
Pos 4
Entity Initial — 4th character is the first letter of the entity name (deductor's name).
Pos 5–9
5 Digits — Sequential number (00001–99999) assigned by the Income Tax Department.
Pos 10
Check Alphabet — Last character is a single letter used as an error-detection code.
Common City Codes (First 3 Letters)
DEL
Delhi
MUM
Mumbai
BLR
Bangalore
CHE
Chennai
HYD
Hyderabad
KOL
Kolkata
PUN
Pune
AHM
Ahmedabad
JAI
Jaipur
LKO
Lucknow
NGP
Nagpur
SUR
Surat
IND
Indore
BHO
Bhopal
PAT
Patna
CHA
Chandigarh
GOA
Goa
BHU
Bhubaneswar
GUW
Guwahati
KOC
Kochi
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