Deposit Invoices for Manufacturers: Bill the Acompte, Deduct It Automatically

It is Monday morning. A customer just signed off on a made-to-order job: a custom conveyor line, twelve weeks to build, roughly thirty-six thousand dollars all in. Before your team cuts a single length of steel, you need money in the door. So you ask for thirty percent up front. Standard. Fair. Everybody does it.

Then the fun starts.

That thirty percent is a deposit invoice, and for most manufacturers the deposit is exactly where billing quietly goes wrong. You raise a request for the down payment. You take the money. Twelve weeks later you invoice the full job. And now someone has to remember to subtract what the customer already paid, get the VAT right on both documents, and prove to an auditor that you did not bill the same work twice. That "someone" is usually a spreadsheet, and that spreadsheet is usually wrong.

Where the deposit quietly breaks

Picture the balance invoice going out at the end of the job. The full contract is thirty-six thousand. Your accounts person is supposed to knock off the ten thousand eight hundred the customer already paid on the deposit. If they forget, you have just billed the customer the full thirty-six thousand on top of the money they already sent. You look greedy, or worse, sloppy.

Now flip it. They remember the deposit, but they subtract it from the wrong figure, or off the total including tax when the taxable base and the VAT need netting separately, or they zero out the deposit VAT on the wrong line. The taxable base is now off. On a job this size that is not a rounding error, it is a number your tax authority will ask about.

Here is the honest part: none of this is hard math. It is just fiddly, manual, and repeated on every single made-to-order order. And "fiddly, manual, repeated" is the exact recipe for the mistake that surfaces months later, in an audit, at the worst possible time.

The deposit is not a billing edge case. For make-to-order manufacturers it is the normal way you get paid. It deserves to be a button, not a memory test.

What a deposit invoice actually is

Strip away the jargon and a deposit invoice (an acompte, in French billing terms, or a prepayment) is simple.

• It is a real, legal invoice for part of an order, raised before the goods exist.
• It carries its own tax, its own number, and its own place in your books.
• When the final invoice for the job goes out, the deposit has to be deducted from it, so the customer pays the balance and only the balance.

The trick is that third point. The deposit and the final invoice are two separate legal documents, but together they can only ever add up to the value of the order, VAT included. Get that link right and everyone is happy. Get it wrong and you have either overcharged a customer or misstated your tax.

In Qualis, that link is not something you maintain by hand. The software owns it.

How deposit invoices work in Qualis

The whole flow starts from the sales order, so the deposit is always tied to a real, confirmed job, not a floating number.

Step one: request the deposit

When you create an invoice from a sales order, you get a Request deposit (acompte) panel right at the top. You choose how the deposit is calculated:

• Percentage of the sales-order total (type in 30, for example), or
• Fixed amount, if you negotiated a flat figure.

Then you click Apply deposit. That is the whole interaction.

Notice what you did not have to do. You did not open a calculator. You did not create a fake "deposit product". You did not guess at the tax. You told the system "thirty percent of this order" and it built the document.

Step two: the deposit becomes a real, numbered invoice

Qualis turns that request into a single, clean line: Deposit for sales order followed by the order code. One line, the right amount, the tax pulled through from the order.

You finalize it exactly like any other invoice. At that moment it gets its permanent, gap-free number, its identity and currency are locked, and it stands as Prepayment in your invoice list, right next to your ordinary invoices. It is receivable, it ages, it can be paid, dunned and reported on like any document you owe money on.

Nothing about it is a placeholder. It is a first-class invoice that happens to be for money paid before the work.

Step three: the final invoice deducts it for you

This is the part the spreadsheet always got wrong, and the part Qualis simply does.

When you raise the final invoice from the same sales order, Qualis looks for any finalized deposit invoices sitting on that order and nets them out automatically. It adds a negative Deposit deduction line, one per tax rate the deposit used, mirroring the deposit's exact tax breakdown. The final invoice's net, its VAT, and its grand total all drop by exactly the deposit.

Work a quick illustrative example. Say the deposit invoice was nine thousand net plus eighteen hundred VAT, so ten thousand eight hundred paid up front. When the balance invoice goes out, that same nine thousand net and eighteen hundred VAT come off it. The customer is billed the balance, once. The VAT is charged once. No line is double-taxed, no total is inflated.

A few things worth knowing about how strict that netting is:

• The deduction is server-owned. You cannot fat-finger it, and nobody can quietly edit the deduction line to change the number. Every time the invoice is saved, Qualis throws away any deduction lines in the request and re-derives them itself.
• A deposit can be settled by at most one live invoice on the order. You cannot accidentally deduct the same nine thousand twice across two balance invoices.
• If you void the invoice that settled a deposit, the deposit is freed and available to settle again, so a cancellation does not strand the money.
• The invoice detail page shows a Settled deposits section and a Total deposits applied figure, so the link between the two documents is visible, not buried.

You get all of this whether you bill the order by ordered quantity or by delivered quantity. The deposit logic sits cleanly on top of whichever billing basis you chose.

Why this matters more than it looks

On the surface, "subtract the deposit" sounds like a five-second task. That is exactly why it is dangerous. It is small enough to be trusted to a person's memory and a side spreadsheet, and big enough that getting it wrong costs you real money or real credibility.

Here is the fair, market-level truth. Plenty of business tools can raise a deposit. Where they leave you exposed is the deduction and the VAT on the final invoice. Many mid-market setups still hand that step back to a human: a manual credit line, a negative row someone types in, a tax figure re-keyed off the deposit. Some suites can do it properly but only after heavier configuration than a plant manager should need. And the smallest shops just run the whole thing out of a spreadsheet next to the accounting software.

The spreadsheet is the real villain of this story. It does not know that voiding the balance invoice should free the deposit. It does not enforce that a deposit gets deducted only once. It cannot stop two people from netting the same payment on two documents. It just holds numbers and trusts you.

Costs you avoid by making the deposit a first-class object: refunding an over-billed customer, restating VAT after the fact, and the slow, unbudgeted hours your finance team spends reconciling deposits against final invoices at month end.

The deposit-to-balance flow at a glance

Zoom out and the whole thing is four steps, and only one of them is a decision you make.

1. Order. A confirmed sales order defines the total value and the tax.
2. Deposit. You request an acompte as a percentage or a fixed amount, finalize it, and collect the money before work starts.
3. Build. Your shop makes the thing. The deposit is already in the door, financing the steel and the labor.
4. Balance. The final invoice pulls from the same order and deducts the deposit automatically, so the customer pays the remainder, VAT-correct, once.

The customer sees a fair balance. Your books see two clean, linked documents. Your auditor sees exactly why the totals add up. And you never opened a calculator.

Frequently Asked Questions

Is a deposit invoice a real invoice or just a request?

It is a real, finalized legal document. When you finalize a deposit in Qualis it receives a permanent, gap-free number, its currency and identity are locked, and it appears in your invoice list as a Prepayment. It ages, can be paid, and can be dunned like any receivable.

How does Qualis stop the customer being charged twice?

When you raise the final invoice from the same sales order, Qualis automatically adds a negative deposit deduction line that removes the deposit's net and VAT from the totals. That deduction is calculated by the server on every save, and a single deposit can be settled by only one live invoice, so the same amount can never be deducted twice or skipped.

Does the VAT come out right on both documents?

Yes. The deposit carries its own tax breakdown, and the deduction on the final invoice mirrors that breakdown rate for rate. Both the taxable base and the VAT drop by exactly the deposit amount, so tax is charged once across the two documents, not twice and not zero.

Can I bill a fixed deposit instead of a percentage?

Yes. The Request deposit (acompte) panel lets you choose Percentage of the sales-order total or a Fixed amount you type in. Either way, Qualis builds a single deposit line tied to the order.

What happens to the deposit if I void the final invoice?

Voiding the invoice that settled a deposit frees that deposit again, so it becomes available to be deducted on a new balance invoice. A cancellation never strands the prepaid amount or double-counts it.

Where can I see which deposits were applied to an invoice?

On the invoice detail page. Qualis shows a Settled deposits section listing the deposit documents that were netted out, plus a Total deposits applied figure, so the link between the deposit and the final invoice is always visible.

The bottom line

The deposit is how make-to-order manufacturers get paid, and the deduction is where that billing quietly breaks. Qualis makes the deposit a first-class invoice and makes the final invoice deduct it for you, VAT and all, with the server refusing to double-charge, double-deduct, or strand the money on a void.

That is one fewer spreadsheet, one fewer awkward call with a customer, and one fewer question you cannot answer in an audit.

Want to see it on your own orders? Explore the invoicing module in Qualis and raise a deposit from a real sales order in a couple of clicks, then watch the balance invoice deduct it on its own.