Invoice Master connects invoicing and inventory through the product catalog. A saved product can supply descriptions, prices, and tax details to a quote or invoice, where staff set the billed quantity. The inventory side uses that product to track stock-on-hand at each location and the movements that changed the count.
The two records stay related without becoming automatic. Creating, sending, or paying an invoice does not deduct stock. Stock changes only when someone records the matching inventory movement, such as a Sale, Transfer, Addition, or Correction. This keeps billing activity and physical stock events separately reviewable.
For a concise product overview, see Invoice Master's invoicing and inventory software. This article focuses on the underlying workflow, operational boundaries, and plan limits.
Product check, July 12, 2026: The workflow and limits below were verified against the current inventory routes, services, and plan entitlements.
How inventory and invoicing work together
A product is the shared reference between the two workflows. On the billing side, it provides reusable line-item information for quotes and invoices. On the inventory side, it identifies the item whose quantity is tracked across locations. Using the same product makes it easier to compare what was billed with what physically moved.
An invoice line is still a billing record, not a stock movement. That separation matters because the operational event may happen at a different time: a business might deliver before invoicing, invoice a deposit before delivery, rent an item temporarily, or cancel an order after creating a draft. Staff therefore need a clear handoff rather than assuming the software inferred what happened to the stock.
Locations and stock-on-hand
Create a location for each place where a separate quantity matters: a shop, warehouse, vehicle, office, or storage unit. The stock-on-hand view is derived from recorded movements at those locations.
Use names that remain meaningful in reports and exports. “Main” may be clear today but ambiguous after opening another site. A code plus name—such as BER-WH — Berlin warehouse—is easier to reconcile.
The Basic plan allows one inventory location. Premium removes that entitlement limit.
Seeded demo inventory, captured July 12, 2026. Names and quantities are illustrative.
Movement types describe the operational event
Invoice Master supports explicit movement types for:
- addition and correction;
- transfer;
- return and rental;
- recall;
- sale and removal;
- lost, damaged, or expired stock; and
- samples.
Choose the type that describes what happened, not the one that merely produces the desired quantity. A correction repairs a record. A sale records a sale-related decrease. Damaged and expired movements preserve a different operational reason even if all three reduce on-hand stock.
For a transfer, record the source and destination accurately. The value of a multi-location ledger is not just the final company-wide total; it is knowing where the stock is expected to be.
Step-by-step example: invoice three items from van stock
Suppose a repair business sells three air filters stored in Van A:
- Check availability. Confirm that the air-filter product has at least three units recorded at
Van A. - Prepare the billing record. Add the saved product to the quote or invoice with a quantity of three. This reuses the product details but does not change stock.
- Deliver the items. Once the technician actually uses or hands over the filters, the physical stock event has occurred.
- Record the stock movement. Post a Sale movement for three units from
Van A. Stock-on-hand and movement history now reflect the delivery. - Review the handoff. Compare the invoice quantity, Sale movement, and remaining van stock. Record payment separately when the customer pays; payment does not create another stock movement.
The right trigger may instead be dispatch, customer acceptance, or a point-of-sale handoff. Pick one physical event, document it, and use it consistently. If an accepted quote is converted into an invoice, quote conversion still does not reserve or deduct inventory.
What the plan limits mean
Basic supports three inventory movements per month and one location. Those small limits are suitable for testing or a very low-volume operation, not for recording daily stock activity. Premium bypasses the inventory movement and location caps.
Products have a separate entitlement: Basic supports ten products. Inventory movements and product records should not be treated as interchangeable plan counts.
What inventory does not currently provide
The current implementation does not include automatic stock deduction from invoice lines, reservation on quote acceptance, reorder points, low-stock notifications, purchase orders, batch or serial tracking, costing layers, or warehouse scanning. It also does not infer a movement from a task, project status, Stripe payment, or supplier bill.
That makes Invoice Master inventory most appropriate for a small team that needs a clear, deliberate movement history next to its product and billing records. The broader Invoice Master versus spreadsheets and specialized systems comparison shows when that scope is enough. A high-volume warehouse or regulated traceability workflow will require a dedicated inventory system or additional controls.
Inventory and invoicing FAQ
Does creating or sending an invoice change stock?
No. Adding a product to an invoice, sending the invoice, or recording its payment does not change stock-on-hand. Record the appropriate inventory movement when the physical stock event occurs.
Can the same product be used for invoices and inventory?
Yes. A saved product can provide reusable details for quote and invoice lines while also identifying the item tracked in inventory. The billing line and inventory movement remain separate records.
When should I record the inventory movement?
Choose a consistent operational trigger such as dispatch, delivery, customer handoff, or another event your team can verify. Record the movement when that physical event occurs, not merely because the invoice was created or paid.
What should I do when the recorded count is wrong?
Count the item physically, then use a Correction movement to align the recorded quantity with the verified count. Review the movement history and handoff process if corrections happen frequently.
A monthly inventory review
- Count selected items physically and compare them with stock-on-hand.
- Review corrections separately; frequent corrections point to a broken handoff.
- Match Sale movements to dispatch or invoice evidence.
- Confirm transfers reached the destination location.
- Investigate lost, damaged, expired, and sample movements by reason.
- Export the organization archive before major operational changes.
The ledger is only as accurate as the events posted to it. Its strength is that those events are explicit and reviewable rather than hidden behind an invoice status.