Inventory Management Software That Follows Your GST Bills
Keep stock, purchases, vendor bills, and GST sales invoices in sync. ZyBill tracks every item from Purchase Order → Stock Receipt → Sales Invoice with a complete movement history.
Built for Indian traders, retailers, wholesalers & manufacturers
No more stock mismatches between your billing operator and your godown register.
Product & HSN Master
Create products with SKU, unit of measurement (PCS, BOX, KG, MTR, etc.), HSN/SAC code, GST rate, sale price, purchase price, and opening stock.
Purchase Orders & Stock Receipt
Raise GST purchase orders for vendors and record partial or full stock receipts against pending PO quantities without duplicate over-receiving.
Sales Invoice Stock Deduction
Issuing an unpaid or paid GST sales invoice automatically deducts stock, while draft invoices hold zero stock impact until finalized.
Vendor Bills & Payables
Convert purchase orders into vendor bills with frozen historical GST snapshots, record vendor payments, and track payable balances.
Credit & Debit Note Stock Sync
Sales credit notes and purchase debit notes reconcile stock movements and adjust customer receivables or vendor payables cleanly.
Product Stock Movement History
Every stock change is backed by an auditable movement ledger — opening stock, purchase receipts, invoice sales, returns, and manual adjustments.
Why Document-Driven Stock Matters
Prevent negative stock surprises and duplicate vendor billing
ZyBill enforces strict business rules so your inventory and payables stay reliable as your team grows:
Available Stock Validation: ZyBill checks available quantity when issuing invoices and reconciles incremental changes when an invoice is edited.
Single Active Bill per PO Guard: Prevents creating duplicate active vendor bills against the same purchase order.
Debit Note Payables Adjustment: Issued vendor debit notes automatically reduce effective bill payable amounts and track vendor recoverable balances.
AI Purchase Entry: Combine inventory with AI Document Entry to extract supplier bills and purchase orders into reviewable drafts.
Sample Product Movement Trail
Every quantity change is linked to its source transaction
Opening Stock
Product Master Setup
+50 PCS
Balance: 50 PCS
Purchase Receive
PO-2026-27-0008
+30 PCS
Balance: 80 PCS
Invoice Sale
ZYB-2026-27-0019
-12 PCS
Balance: 68 PCS
Sales Credit Note
CN-2026-27-0003
+2 PCS
Balance: 70 PCS
Inventory & Purchase Management FAQs
How does ZyBill keep inventory accurate with GST billing?
In ZyBill, stock follows your financial documents. Receiving goods against a purchase order increases stock, issuing a GST sales invoice deducts stock, and credit/debit notes or manual stock adjustments record exact movement entries.
Do draft invoices deduct inventory in ZyBill?
No. Draft invoices do not deduct stock. Stock is deducted only when an invoice is issued, ensuring quotes and drafts never distort your live warehouse balance.
Can I receive stock in multiple batches against one Purchase Order?
Yes. ZyBill tracks pending receivable quantities on purchase orders so you can record partial stock receipts as goods arrive and convert the PO into a vendor bill.
Can I see why a product’s stock quantity changed?
Yes. Every product has a dedicated Stock History view showing each movement (opening balance, purchase receive, invoice sale, credit/debit note, or manual adjustment) with date and reference.
Which ZyBill plan includes full inventory and purchase management?
You can test full inventory and purchases free for 7 days. Starter (₹999/first year) includes view access for inventory and purchases, while Pro (₹1,999/first year) and Business (₹4,999/first year) unlock full inventory, purchase order, vendor bill, and adjustment operations.
Take control of your stock and GST billing
Start your 7-day free trial and manage inventory, purchases, and invoicing from one cloud account.