Belgium E-Invoice Fine & 120% Check 2026 by ReadyStack

What one PDF-only B2B invoice costs a Belgian seller now that the tolerance period is over — and what the 120% deduction gives back


Click Add to Firefox on this page. Nothing to unzip, no developer mode - the free version runs right away.

• Next fine tier, not a flat number — Belgian penalties escalate €1,500 then €3,000 then €5,000, and an offence only counts as the next one if it is established more than three months after the previous one — the tool steps through the tiers instead of repeating €1,500.
• Exposure over an audit horizon — Turns the three-month escalation rule into the worst-case euro total a controller could establish over the horizon you type, so the number on screen is a sum you can put next to a subscription price.
• 120% cost deduction, in cash — Belgian small companies and sole traders deduct 120% of e-invoicing subscription and consulting costs for financial years 2024-2027; the tool shows the extra 20% slice and the tax it actually saves at your rate.
• Net cost and cost per invoice — Subtracts the extra deduction from the yearly spend and divides by your invoice volume, so the decision reads in cents per invoice instead of euros per month.
• Payback against one fine — Shows how many months of the software a single established infringement pays for, which is the comparison an owner actually makes.
• Nothing leaves the browser — Every figure is computed in the popup and in the free web page from the same tool.js; no invoice, client name or amount is sent anywhere, and the only outbound call in the extension is the licence-key check.

| You type | |
|---|---|
| Peppol invoicing software | default 39 |
| One-off onboarding / consulting | default 450 |
| Your rate on the extra deduction | default 25 |
| E-invoicing infringements already established | default 0 |
| Audit horizon | default 12 |
| B2B invoices you send | default 120 |

| It answers | |
|---|---|
| Eligible cost, year 1 | € |
| Extra 20% deduction | € |
| Tax the extra slice saves | € |
| Net cost, year 1 | € |
| Next infringement costs | € |
| Worst case over the horizon | € |
| One fine buys this much software | months |
| Net cost per invoice | cents |

Permissions requested: storage, alarms


Free: the calculation in the popup, no key, no limit. Full version ($60): download the result as .csv and deadline reminders - one licence key per person or team seat. Get it: https://getreadystack.com/api/buy/cl/polar_cl_j97o6a5hkfQ6Xg3wrq6rGfg5aRLb8AFpPNQaL14vSvG


When you use the tool, the extension sends one anonymous count a day (the tool’s name only — no inputs, no personal data). Turn it off on the first page after install. Firefox asks first and sends nothing unless you allow it. A licence key is checked with the payment provider (Polar) only when you enter one.