Multi-entity, multi-currency business app for a group: 2026 cost

The verdict in three sentences

A multi-entity, multi-currency business application costs between EUR 90,000 and 200,000 excl. VAT in 2026 for a group of 5 to 10 subsidiaries, a 20 to 35% premium over the same application built for a single company. The premium concentrates on four building blocks: data segregation per entity, currency and exchange rate handling, intercompany recharging and consolidated reporting. A group that currently tracks internal orders in one Excel file per subsidiary usually pays back the investment within 18 to 30 months thanks to saved reconciliation hours and a faster monthly close.

What drives up the budget of a group application

A single-company application rests on a simple assumption: one legal entity, one currency, one invoice numbering sequence. As soon as the group has several legal entities, every business object (order, invoice, customer, supplier, item) must carry an entity identifier, and every screen must filter according to the user's rights. A buyer at the Casablanca subsidiary should only see her own orders, while the group controller at the Lyon head office needs to see everything, in EUR.

Multi-currency adds a second layer. The group invoices in EUR in France, MAD in Morocco and FCFA (XOF) in Senegal. The FCFA has a fixed peg to the euro (655.957 FCFA for EUR 1), which simplifies conversion, but the Moroccan dirham floats against an EUR/USD basket. The app must therefore store the rate applied to each transaction, distinguish the spot rate, the monthly average rate and the closing rate, and compute exchange differences.

These amounts (excl. VAT) are 2026 orders of magnitude for custom development in Next.js on PostgreSQL, excluding ERP licences. The actual gap mainly depends on how many local tax rules must be built in: French VAT at 20%, Moroccan VAT at 20% with its reduced rates, Senegalese VAT at 18%.

Three project levels depending on group maturity

Not every group needs the same scope. The right level depends on the number of subsidiaries, the volume of intercompany flows and whether a consolidation ERP already exists.

Intercompany recharging is often the most profitable block. When the French subsidiary sells services to the Senegalese subsidiary, the app simultaneously generates the sales invoice on the French side and the purchase invoice on the Senegalese side, in both currencies, at the same rate. Reconciliation gaps, which often tie up several days of work per month at head office, almost entirely disappear.

Points to check before signing

First: the reporting currency. It must be set at design time, usually EUR for a group whose parent company is French. Changing the reporting currency after go-live means recalculating the entire history.

Second: legal data segregation. Personal data of Moroccan customers falls under law 09-08, Senegalese customers under law 2008-12, French customers under the GDPR. Hosting and access must be documented for each entity.

Third: invoice numbering. Each entity must keep a continuous sequence with no gaps, in line with local tax requirements. A numbering sequence shared across subsidiaries is a common and costly mistake to fix.

Mini case study

Claire, CFO of a 7-subsidiary group headquartered in Lyon (4 in France, 2 in Morocco, 1 in Senegal), processes about 1,400 internal orders per month. Today, 4 accountants each spend 6 days a month reconciling intercompany flows and converting amounts, or 288 days a year. At a fully loaded cost of EUR 420 per day, that is about EUR 121,000 a year.

She chooses the Integrated group level for EUR 145,000 excl. VAT, plus EUR 19,000 in annual maintenance. The app cuts reconciliation time by 70%, saving about EUR 84,700 a year. Net annual gain: EUR 65,700. Payback: about 26 months, and the monthly close moves from D+12 to D+6, bringing executive committee decisions forward by a week.

FAQ

How much does a multi-entity app cost compared with a standard app?

Expect a 20 to 35% premium over a single-company application of equivalent scope. For a baseline project at EUR 75,000 excl. VAT, the multi-entity budget therefore sits between EUR 90,000 and 101,000.

How do you handle FCFA and dirham in the same application?

The FCFA has a fixed peg of 655.957 FCFA per EUR 1, so its conversion is stable. The dirham floats: the app must store each transaction's rate and compute exchange differences at closing, which represents EUR 9,000 to 16,000 of development.

Do we need to replace our ERP?

No, in most cases. The business app handles operations (orders, recharging) and pushes entries into the existing ERP. The ERP connector costs EUR 20,000 to 40,000 excl. VAT depending on the vendor.

What timeline should a 7-subsidiary group expect?

Between 5 and 7 months for the Integrated group level, including 4 to 6 weeks of acceptance testing with one key user per subsidiary. A gradual rollout, subsidiary by subsidiary, secures the switchover.

Who sees which data?

Each user is attached to one or more entities, with a role per entity. Head office gets a consolidated view in the reporting currency, subsidiaries only see their own flows.

Let's scope your project. Tell us the number of subsidiaries, the currencies and your intercompany flows: we will price the scope, an indicative budget and a rollout plan per entity. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.