23 July 2025
Great question! Letโs clarify the concept of **self-invoicing** under GST and whether a **separate bill book** is required.
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### โ What is Self-Invoicing?
Self-invoicing is **raising an invoice on your own** when you purchase **goods or services from an unregistered supplier** under the **Reverse Charge Mechanism (RCM)**.
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### ๐ Is a **Separate Bill Book** Required?
**Legally, no separate bill book is mandated**, but it is **practically advisable**. Here's why:
#### โ Reasons \*\*Why a Separate Bill Book is NOT Mandatory:
* **No explicit requirement under GST law** to maintain a separate book for self-invoices. * The **self-invoice is a compliance document**, not a sales invoice. * You just need to **maintain proper serial numbering** and **record keeping**.
#### โ ๏ธ However, maintaining a **separate series or bill book** for self-invoicing is considered **good practice**:
* It helps in **distinguishing self-invoices from normal purchases or sales**. * Makes **GSTR-1 and GSTR-3B reporting easier**, especially under audit or assessment. * Helps in tracking **RCM liability** and **input tax credit (ITC)** claimed.
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### ๐ GSTR-1 Implication:
Youโre right that in **GSTR-1**, self-invoiced details show up as **outward supply under RCM**, even though it's a **purchase** from your side. Thatโs why:
* Keeping it in a **separate series** (even if not in a separate book) is **highly recommended**. * Use a prefix like **"RCM/" or "SI/"** to distinguish such invoices.
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### โ Conclusion:
* **Not mandatory** to maintain a separate bill book for self-invoicing. * But **advisable** to use a **separate invoice series** or **register** to make accounting and compliance easier.
Let me know if you'd like a **sample format for a self-invoice under RCM**.