Illumi

Service

Custom invoicing software

Off-the-shelf invoicing software works as long as your business works like everyone else's. When invoices have to come out of your shop by themselves, pass through several people or look like your brand rather than the software — that's when a system gets written. We issue our own invoices from one we wrote ourselves.

Prices start at
€2,000
Design
Yours
Per-user fee
None
The code
Yours
An invoice from our own system, which prints in Bulgarian — with made-up data
An invoice from our own system, which prints in Bulgarian — with made-up data

What it can do

Whatever your process needs.

These are the things we're asked for most often. The list isn't a menu with limits — each item is built around the way you work, not someone else's.

Our own

Our own invoices come out of a system like this.

Illumi's invoices are issued from a system we wrote for ourselves. Here's what it does today — as an example of how far such a system goes, not as a limit.

Numbered only when issuedA draft doesn't use up a number, so there are no gaps in the sequence. An issued invoice can't be deleted.
Euro and lev equivalentAmounts are in euro, with the lev equivalent at the fixed rate of 1.95583 shown beneath them.
Bulgarian VAT regimesNot VAT-registered, with VAT, intra-Community supply, services to the EU, reverse charge, export — with the correct legal basis on the page.
PDF in the browserThe document is created right in the browser, with real text you can search and copy. It weighs about 60 KB.
Payment QR codeThe code carries the IBAN, amount and reference. Banking apps that read it fill in the payment themselves.
Sending with trackingThe invoice goes out by email with the PDF attached and a link to it, and the system notes when the customer opened it.
Monthly archiveIncome and expense documents by month, with totals for each month and an archive for your accountant in one click.
Team and logA task board for the team, notes on every document and a log of who did what and when.

Honestly

When you don't need it — and when it pays off.

Free invoicing software does the job for most companies. If you're one of them, we'll tell you in the very first conversation.

A few invoices a monthOff-the-shelf software is enough, often even the free kind. A custom system has no way to pay for itself.
A standard processIf an invoice is simply written and sent, ready-made products have done that well for years.
You retype by handOrders from the shop, hours from a spreadsheet, details from email — every line someone enters a second time costs time and causes mistakes. This is where the system pays off fastest.
You pay per userSubscriptions grow with the team. Your own system has no per-person fee — only hosting and maintenance.
Unusual documentsProtocols, receipts, contracts and invoices that have to link to one another rarely fit into a ready-made product.
Everything in one placeInvoices, expenses, tasks and reports in one system, instead of in four apps and a spreadsheet.

How it goes

The page first, then everything around it.

The document your customers see is made first. Everything else is built around it in stages, with a working part at each one.

01

Conversation

How an invoice is issued today — who does it, from what and how many times a month. Including the workarounds, because that's where the real task is.

02

Scope and price

What goes into the first version and what is left for later. A written quote with stages and a timeline.

03

Designing the document

The page is designed in your brand and checked on paper, as a PDF and on a phone.

04

Development in stages

Issuing and sending first, then the links to the shop, the warehouse and the accounts.

05

Testing with real cases

Test documents built on your cases, including the odd ones — credit notes, foreign customers, discounts.

06

Launch and migration

Importing your customers and old invoices, training the team. The code and the access are yours.

Related services

What else comes into it.

It's rarely just one thing. Here are the services that go with this one, and why.

Questions

About invoicing systems.

If your question isn't here, call us — we answer by phone too.

+359 882 95 89 89
How much does custom invoicing software cost?

It starts at €2,000 for a system that issues, sends and stores your team's invoices. Links to a shop, warehouse or accounting software and unusual documents are priced separately.

The exact price is in the written quote after our conversation, because the same idea can be simple or complex depending on your process.

Does invoicing software need to be approved by the Bulgarian tax authority?

Issuing invoices doesn't require the software to be approved. What's required is that the invoice contains the mandatory details under the Bulgarian VAT Act and that the numbering is sequential, with no gaps — the system takes care of both.

It's different if the software will manage sales in a retail outlet with cash or card payments. Then the requirements of Ordinance N-18 for sales management software (SUPTO) apply. Which case is yours is worked out in the first conversation. This isn't legal advice — if in doubt, we also ask your accountant.

Can invoices be in euro?

Yes. Amounts are in euro, and beneath them the system shows the lev equivalent at the fixed rate of 1.95583. Ours works the same way.

Can invoices be issued automatically from an online shop?

Yes. A paid order creates an invoice, the number is assigned automatically and the PDF goes to the customer. If something's wrong — a missing company number or address — the invoice stays a draft and someone on the team takes a look.

See also integrations — the same principle applies to the warehouse, courier and accounting.

Why not ready-made online invoicing software?

In most cases a ready-made one is the more sensible choice, and we'll recommend it. A custom system makes sense when data is retyped by hand, when the team is large and you pay per user, or when your documents don't fit into the ready-made product.

Can you move our old invoices over?

Yes — the customers, numbers and amounts. Our own system started by importing the entire archive from our previous software, and the total matched the paper copies to the cent.

Who owns the system and the data?

You do. You get the code, the database and the access. The data lives on your hosting, not in someone else's service you'd have to export it from if you decided to leave.

Next step

Tell us how you issue invoices today.

Who writes them, from what, and how many there are a month. That shows whether you need a system — and if you don't, we'll tell you.

+359 882 95 89 89 office@illumi.bg

Sofia, Bulgaria We reply within 24 hours In business since 2012

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We'll be in touch within 24 hours on working days. If it's urgent, call +359 882 95 89 89 — we react faster by phone.