Forganiser
EN
Book a demo
← All articles

Dimona forgotten or filed late: penalties and fixes in 2026

Published on

A stand-in who calls at 5 p.m. to say he can make it after all. A casual worker who unexpectedly stays on for a third day. A warehouse employee who starts half a day earlier than planned. Each one is a situation where the Dimona declaration slips through the cracks in the rush — and that is exactly where the social inspectorate looks hardest.

The price of that slip is no symbolic slap on the wrist. In 2026, the flat-rate solidarity contribution rises to 3,674.09 euros per undeclared worker, with criminal or administrative penalties on top. Time to set out the rules and the ways to put things right.

The basic rule: before the start, not after

The Dimona (immediate declaration of employment) notifies the NSSO of every entry into and exit from service. Two deadlines matter:

  • Dimona IN: at the latest before the employee starts working. Not at the first coffee break, not at the end of the shift. Before the first hour worked.
  • Dimona OUT: at the latest on the first working day following the day on which the legal or contractual relationship ends.

The reporting obligation applies to virtually all private-sector employees, including those not subject to the classic NSSO contributions. A few exceptions are certain trainees, people with a local employment agency (PWA) contract and volunteers. You will find more detail in the NSSO instructions on Dimona.

Not every Dimona is the same

The worker type determines the ground rules:

  • OTH — the ordinary employee. With a fixed-term contract, you may enter the end date straight away.
  • STU — the student. You also state the number of hours per quarter. Without a correct STU declaration, you fall back on the ordinary contributions instead of the solidarity contribution for student work.
  • FLX — the flexi-job worker. The declaration is checked against the work performed in quarter T-3. Only a timely declaration with an 'OK' response allows you to report the person as a flexi-job worker in the DmfA. IN and OUT must fall within the same quarter, so never conclude flexi contracts that run across two quarters.
  • EXT — the occasional worker, with a day and hour declaration. In the hospitality sector (JC 302) this applies to contracts of no more than two consecutive days with the same employer.

What does a forgotten Dimona really cost?

1. The solidarity contribution. If the inspectorate establishes that you did not file a Dimona for a worker who belongs in the DmfA, the NSSO imposes a flat-rate solidarity contribution. It equals three times the basic contributions on the guaranteed average minimum monthly income, with an indexed minimum originally set at 2,500 euros. For 2026, that flat rate comes to 3,674.09 euros per worker. The amount is charged to the quarter in which the finding was made and is communicated by registered letter.

2. Criminal or administrative penalties. The absence of a Dimona declaration is a level 4 offence under the Social Criminal Code — the most serious level, with a fine multiplied by the number of workers involved. Four undeclared cleaning staff on one site therefore means four times the fine.

3. New since 2026: loss of NSSO reductions. The programme act approved in the Chamber at the end of May 2026 adds Article 107/1/1 to the Social Criminal Code: loss of the benefit of contribution reductions. In the case of intentional offences — deliberately filing no or incorrect Dimona declarations, false statements, fraudulent set-ups — the court can decide that you temporarily lose the right to a series of NSSO contribution reductions. For a company that relies on target-group reductions, that additional penalty can weigh more heavily than the fine itself.

4. The loss of your favourable regime. This is the silent cost. No timely 'OK' on an FLX declaration means ordinary employer contributions on that pay instead of the flexi contribution. No correct STU declaration with hours means ordinary contributions on student work. A casual worker in hospitality who stays on for a third day loses the daily flat rate for the entire period.

The five moments where it goes wrong in practice

  • The last-minute stand-in. Someone steps in after a sick call and starts within half an hour. The declaration only follows the next day — too late.
  • The casual worker who stays on. An occasional worker in hospitality works a third consecutive day. You then have to cancel the original EXT declarations and file one OTH declaration from the first working day onwards. Forget that, and your entire quarterly declaration is wrong.
  • The flexi contract that crosses quarters. A flexi-job running from 25 March to 10 April has to be split. If it isn't, the status is lost.
  • The early start. If the actual start date is earlier than the declared date, you have to report this under the Dimona IN rules — so before that actual start. In practice this means: it cannot be put right afterwards.
  • Student hours that don't add up. If the student worked more or fewer hours than declared, you have until the end of the month following the quarter to adjust the declaration.

Too late? Here's what to do now

  1. File the declaration anyway, immediately. A late Dimona is still better than no Dimona: it shows good faith and limits the risk of the most serious classification, in which intent plays a role.
  2. Correct in the right order. A later actual end date is reported under the OUT rules. A full cancellation deletes the IN, the OUT and the UPDATE together.
  3. Document the cause. If the contribution has been imposed and you can demonstrate that the worker was materially unable to work during part of the period, the amount can be reduced.
  4. Check with your payroll office before you start cancelling things yourself. An incorrect correction sometimes creates a second offence.
  5. Set out how it will work from now on. One clear person responsible per site and a fixed moment in the recruitment process remove most of the errors.

Prevention: link your planning to your declaration

The core of the problem is almost never unwillingness. It is an information gap: the schedule lives with the shift supervisor, the Dimona with the administration. The bigger that gap, the more last-minute changes go undeclared.

That is why a watertight Dimona practice starts with staff scheduling itself. Whoever assigns a shift in the roster immediately generates the matching declaration — with the right worker type, the right hours and a visible response. In hospitality and logistics, where stand-ins and temporary workers change daily, that saves dozens of manual steps per week. Forganiser therefore links scheduling, contract management and Dimona in one flow, so that a change in the roster is never left without a declaration.

Do you work a lot with flexi-job workers, casual staff or students? Then also read how to manage flexi-jobs correctly and how to schedule the 50-day quota in hospitality smartly. A correct Dimona starts with a sound flexible workforce policy — not with the form.