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Configure GST
This walkthrough gets GST Manager producing correct tax invoices. You'll fill in GST Manager → Setup → Company & Tax — your company identity, GSTIN, home state, default rate, codes and invoice numbering. Have your GSTIN (your 15-character GST registration number) and PAN handy before you start.
GST Manager → Setup → Company & Tax
Why this matters
Your home state and GSTIN drive the whole tax engine: whether an invoice splits into CGST + SGST (a sale inside your state) or a single IGST line (a sale to another state), and whether a customer is treated as B2B (they have a GSTIN) or B2C (they don't).
Step 1 — Company info
In the Company info section, enter your Company name and Company GSTIN. These identity fields are shared with your AcelleMail admin contact — editing them here updates the admin contact too, so you only maintain them in one place. Type your GSTIN carefully; it prints on every tax invoice. To confirm the format is right, see GSTIN validation.
Step 2 — Address and home state
Fill in Address line 1/2, City, ZIP / PIN and Country, then set State. The State field is the one that matters most for tax: its help reads "Used to decide CGST+SGST vs IGST. Matched against the Indian states registry." Pick your registered home state from the list so the engine can compare it against each customer's state.
Step 3 — Tax & GST
Under Tax & GST, set your Default GST rate (for example, 18). Then set the Tax label — its help reads "Shown as the label of the consolidated tax line on PDFs (e.g. GST)." Most sellers leave this as GST.
Step 4 — SAC & Purpose code
Enter your SAC code (the service accounting code that classifies your service for tax) and your Purpose code (the RBI code that classifies export payments). Both are "Applied to every line item on every invoice," so set them once here. How these appear per invoice is covered in GST classification.
Step 5 — Invoice numbering
In Invoice numbering, set the Invoice number format and the Next invoice number. The format uses a sprintf template — for example %08d produces 00000001, %d gives a plain number, and INV-%06d gives INV-000001.
These two are core settings
The invoice number format and next number are AcelleMail core settings, shared with your general settings — changing them here changes them everywhere. Set the next number to continue your existing sequence rather than reset it.
Step 6 — Save changes
Click Save changes. You'll see the confirmation "Settings saved." Your invoices now carry your GSTIN, correct tax split and numbering. Continue with your invoice logo, footer and bank details in Invoice identity and bank details.