Assemble your finance stack by stage

There's no one good stack, there's yours, now

The most common mistake is copying the stack of a more advanced entrepreneur. What suits a company billing €500,000 is wasteful for someone just starting, and vice versa. The right finance stack depends on your stage: status, volume, presence or not of recurring revenue, international or not. This chapter gives three typical configurations, to adapt.

The guiding principle stays "lean stack": start minimal, only add a tool when real, recurring work justifies it, and always favor tools that connect.

Stage 1 — Getting started (sole trader, freelancer, near-zero budget)

You're launching, volume is low, every euro counts. Goal: be compliant and clean, without paying for what you don't yet need.

Account: a free or low-cost business account — Shine (free plan with invoicing included) or a dedicated second current account.
Invoicing: Shine's free module, Abby (built for sole traders), or Henrri.
Collection: Stripe Payment Links for cards, added to the invoice.
Accounting: Indy (~€24) if you want to do everything yourself, or nothing beyond a revenue ledger if you're a very simple sole trader.
Cash flow: a spreadsheet updated every Monday.
Steering: the three basic numbers in the same spreadsheet.

Possible total cost: from €0 to ~€30/month. Everything else waits.

Stage 2 — Growth (company, first recurring revenue, a few freelancers)

The business takes off, you incorporate, the volume of invoices and expenses rises, you work with providers. Goal: automate to avoid drowning, and make the close reliable.

Account: Qonto (Smart or Premium) for integrations and per-project cards, or a traditional bank if you need financing.
Invoicing + accounting: Pennylane (invoicing, expenses, cash flow, accounting in one flow), paired with an accountant for the close — or Dougs if you prefer integrated software + expert.
Recurring collection: Stripe Billing with dunning enabled, GoCardless for SEPA.
International: Wise or Revolut Business to pay freelancers and suppliers at the real rate.
Cash flow: Pennylane's module, or a light tool (RocketChart, Fygr) as accounts multiply.
Steering: native dashboard + weekly/monthly ritual.

At this stage, VAT and tax provisions live in a dedicated sub-account, fed at each collection.

Stage 3 — Structuring (volume, a team, several flows)

The company has a team, several revenue sources, payments in several currencies. Goal: consolidated visibility and controlled delegation.

Account: Qonto Premium/Business or a traditional bank, with sub-accounts and capped cards per team.
Accounting: Pennylane or equivalent, accountant systematically for the close and optimization.
Cash flow: Agicap (multi-account aggregation, scenarios, reliable forecast).
Payroll: PayFit or accountant; Deel/Remote if hiring abroad.
Steering: a light BI tool (Looker Studio, Metabase) consolidating sources, plus AI analysis for ad hoc questions.

Here, your role shifts: you no longer enter data, you supervise a system and partners.

The connections rule: make the data flow

Whatever the stage, value comes from connections, not isolated tools. The ideal chain:

flowchart LR
    A[Quote signed online] --> B[Compliant invoice]
    B --> C[Stripe payment link]
    C --> D[Qonto/Shine business account]
    D --> E[Pennylane/Indy accounting]
    E --> F[Cash flow & forecast]
    F --> G[Dashboard]
    G --> H[Weekly decision]

Each arrow is a re-keying removed. A signed quote becomes an invoice, which is paid by link, the payment flows to the business account, the account feeds the accounting, the accounting feeds the cash flow, the cash flow feeds the dashboard, and the dashboard triggers the decision. When this chain runs, management takes a few minutes a week instead of entire weekends.

Pitfalls to avoid while assembling

A few classic stack-building errors:

Stacking tools that don't talk. Two excellent disconnected tools are worth less than one good integrated pair.
Over-tooling too early. Buying Agicap or sophisticated BI when a spreadsheet suffices means paying and complicating for nothing.
Outsourcing your understanding. Even when delegating to an accountant, you must understand your numbers. The tool and the expert assist the decision; they don't make it.
Forgetting the e-invoicing migration. Choose tools compatible with mandatory electronic invoicing so you don't migrate in a panic.

In practice

Identify your current stage among the three, and write down the corresponding stack: account, invoicing, accounting, cash flow, international, steering. For each box, note the chosen tool and check that it connects to its neighbor. You get not a list of apps, but a chain — your operational financial system, sized for today and ready to grow.