How to Make a GST Invoice in India — Complete 2026 Format Guide

GST invoice ek legal tax document hai jo registered supplier ko har taxable supply par issue karna hota hai. Ye sirf payment record nahi — buyer ke input tax credit (ITC) claim ka base document hai. Agar aapka business GST-registered hai, to B2B sales par proper tax invoice mandatory hai; B2C me bhi prescribed limit se upar invoice zaroori hai.

Goods ke case me invoice generally supply ke waqt ya usse pehle issue hota hai; services me service complete hone ke 30 din ke andar. Late ya missing invoices se buyer ka ITC atakta hai aur aapke GSTR-1 me mismatch aata hai — dono taraf compliance problem. Isliye invoice discipline day-one se set karo.

CGST Rules ke under tax invoice me ye fields required hain: (1) supplier ka naam, address, GSTIN; (2) consecutive invoice number (unique, financial year ke andar); (3) invoice date; (4) recipient ka naam, address, aur B2B me GSTIN; (5) HSN/SAC code; (6) goods/services ka description; (7) quantity aur unit; (8) total value; (9) taxable value (discount ke baad); (10) tax rate aur amount — CGST/SGST ya IGST alag-alag; (11) place of supply with state name (inter-state me); (12) supplier ya authorised signatory ka signature/digital signature.

In me se koi bhi field missing ho to buyer ka ITC question ho sakta hai aur audit me penalty risk banta hai. RealBill GST Invoice Generator ye saare fields structured format me leta hai aur consistent PDF layout deta hai, taaki manually banate waqt koi field chhoot na jaye.

HSN (goods) aur SAC (services) codes turnover ke hisaab se mandatory digits me likhne hote hain: Rs 5 crore tak annual turnover wale businesses ko B2B invoices par 4-digit HSN chahiye, Rs 5 crore se upar walon ko 6-digit. Galat ya missing HSN se GSTR-1 filing me error aata hai aur buyer side reconciliation fail hota hai.

Apne main products/services ke HSN/SAC codes ek baar CBIC ki official list se confirm karke apne invoice tool me save kar lo. Har invoice par same codes consistently use karo — ad-hoc alag codes likhna returns me mismatch ka common source hai.

Intra-state supply (supplier aur place of supply same state) par tax do hisso me split hota hai: CGST + SGST, dono equal. Inter-state supply par poora tax IGST ke roop me lagta hai. Example: Maharashtra ka supplier Maharashtra ke buyer ko Rs 1,00,000 ka 18% GST supply kare to invoice me CGST Rs 9,000 + SGST Rs 9,000 dikhega; wahi supply Karnataka ke buyer ko ho to IGST Rs 18,000.

Services me place of supply rules nuanced hain (recipient location, immovable property location, event location, etc.) — apne supply type ka rule gst.gov.in se ek baar verify karo. Galat split (IGST ki jagah CGST/SGST) common error hai jo returns me correction maangta hai.

Invoice number consecutive aur unique hona chahiye ek financial year ke andar, maximum 16 characters, letters/numerals/special characters (- aur /) allowed. Aap multiple series chala sakte ho (jaise RB/26-27/001 domestic ke liye, EXP/26-27/001 export ke liye), lekin har series ke andar gap nahi hona chahiye.

Naya financial year shuru hote hi nayi series shuru karna best practice hai (jaise 2026-27 ke liye fresh numbering). Cancelled invoices ko delete mat karo — cancel mark karke record rakho, kyunki GSTR-1 me cancelled numbers bhi report structure ka part hote hain. Series gaps audit me sawal khade karte hain.

Suppose aap Pune ke freelance developer ho aur Mumbai ke client (dono Maharashtra, B2B) ko Rs 50,000 ki service dete ho, SAC 998314, GST 18%. Invoice me: taxable value Rs 50,000; CGST 9% = Rs 4,500; SGST 9% = Rs 4,500; total invoice value Rs 59,000. Client ka GSTIN mandatory hai taaki wo Rs 9,000 ka ITC claim kar sake.

Same client agar Bengaluru (Karnataka) me ho to IGST 18% = Rs 9,000 lagega, aur place of supply me Karnataka + state code likhna hoga. Amount-in-words, payment terms, aur bank details add karna legal requirement se upar hai lekin payment speed ke liye practical zaroori hai.

E-invoicing (IRN + QR code via Invoice Registration Portal) notified turnover threshold se upar ke businesses ke liye mandatory hai — ye threshold time ke saath ghata hai, isliye current limit gst.gov.in se confirm karo. Agar aap threshold me aate ho to bina IRN ke B2B invoice invalid maana ja sakta hai.

Invoice issue hone ke baad value change karni ho to invoice edit mat karo — credit note (value kam karne) ya debit note (value badhane) issue karo, original invoice reference ke saath. Ye notes bhi GSTR-1 me report hote hain aur buyer ke ITC ko adjust karte hain.

Har month GSTR-1 file karne se pehle apni invoice list ko returns data se reconcile karo: (1) saari invoice numbers series me hain, gaps nahi; (2) har B2B invoice me valid recipient GSTIN; (3) HSN summary turnover rule ke hisaab se; (4) CGST/SGST vs IGST split place of supply se match karta hai; (5) credit/debit notes original invoices se linked hain.

Ye 30-minute monthly habit year-end me CA fees aur notice stress dono bachati hai. Buyers ka GSTR-2B aapke GSTR-1 se banta hai — aapki filing clean hogi to unka ITC smooth milega aur repeat business relationship strong rahegi. Invoice banana RealBill par free hai; discipline aapko rakhni hai.