An unpaid invoice can quickly turn into a liquidity problem: fewer resources than expected come in, deadlines for suppliers and banks approach, and planning purchases or investments becomes difficult. In this situation, it is natural to wonder whether you can demand only the price stated in the invoice or also interest, expenses, and damages caused by the delay.
The credit and the damage do not coincide. I want to help you distinguish what normally derives from non-payment from what requires further proof. We will see when the rules on late payments in commercial transactions apply, how to identify the deadline, which documents matter, and why choosing between an agreement, a formal request, and legal action also depends on the actual possibility of recovering the sums.
The unpaid invoice alone does not prove every damage
The first right is to obtain the due consideration. If you delivered goods or performed a service according to the agreement, the starting point is the unpaid price. The invoice identifies the amount, date, and accounting operation, but the credit is founded on the relationship that generated it: contract, order, confirmation, delivery, performed service, and payment terms.
The liquidity crisis does not automatically generate unlimited compensation. The delay can create very serious consequences for the creditor company, but it is necessary to separate the items that the law recognizes in connection with the delay from additional ones that must be proven. Late payment interest and the lump-sum reimbursement of recovery costs have a different function from the loss suffered due to more expensive financing or a business deal that could not be concluded.
The cause of non-payment also matters. A client who postpones without contesting the supply is in a different position than someone who contests the quantity, quality, conformity, or execution of the service. The contestation does not eliminate the credit by itself, but it may make it necessary to first clarify whether the service corresponded to what was agreed and whether the sum is already payable, meaning concretely due.
Acting early does not mean acting automatically. A well-circumscribed request can bring to light whether the debtor intends to pay, propose an installment plan, or object on the merits. Conversely, neglecting communications reporting a specific contestation can make it harder to choose the right tool and correctly quantify what you are asking for.
When interest applies in commercial transactions
The special discipline concerns commercial relationships. Legislative Decree No. 231 of 2002 applies to payments due as consideration in contracts between businesses or between a business and the public administration, when the contract has as its prevailing object the delivery of goods or the provision of services against a price. The notion also includes those who practice a freelance profession within the scope of economic activity. You can read the current text of Legislative Decree No. 231/2002 on late payments.
It is not enough for an invoice to exist. If the debtor is a consumer, the special discipline of commercial transactions is not the reference point. The same decree excludes, among other things, debts involved in insolvency proceedings or debt restructuring procedures already open against the debtor. In these situations, the way to enforce the credit and ancillary sums must be reconstructed with different rules.
The due date is the first piece of information to identify
Interest accrues from the day following the due date. If the contract establishes a valid payment term, that date guides the calculation. If instead a contractual term is missing, the decree generally provides for thirty days from receipt of the invoice or equivalent request; in other cases, the delivery of the goods, the performance of the service, or any conformity check provided for by the agreement are relevant.
A very long term is not always neutral. Between businesses, a term exceeding sixty days must result from an express agreement, proven in writing, and must not be grossly unfair to the creditor. In relations with the public administration, more restrictive rules and some specific exceptions operate. For this reason, it is not sufficient to read the wording unilaterally stated on the invoice: it must be compared with what the parties actually agreed upon.
The verification of the supply has its own limits. When the contract provides for a check of the goods or service before payment, the verification procedure cannot become an indefinite postponement. The decree establishes a maximum ordinary duration of thirty days from delivery or performance, barring an express, documented agreement that is not grossly unfair to the creditor.
Default interest, 40 euros, and recovery costs
Default interest can accrue without prior formal notice. In commercial transactions, the creditor is entitled to interest on the amount due if the debtor does not prove that the delay depends on a cause not attributable to them. Putting the debtor in default often remains useful to precisely define the request and set a final operational deadline, but it is not the prerequisite for the accrual of interest provided by the special discipline.
The rate is not a fixed number written once and for all. Statutory default interest is built on the reference rate of the European Central Bank, increased by eight percentage points. The reference rate changes every semester; therefore, the calculation must consider the actual period of delay and not a percentage chosen in an approximate way. Between businesses, a different rate can be agreed upon, within the limits of clauses that are not grossly unfair.
The delay may also entitle you to 40 euros. Article 6 of Legislative Decree No. 231/2002 recognizes a lump-sum amount of 40 euros to the creditor for damages from recovery costs, without the need for formal notice of default. Additional costs incurred to recover the credit remain reimbursable, but their request requires a concrete basis: indicating a generic figure as a reminder or assistance expense is not enough.
Clauses that eliminate all protection are not always effective. The decree considers null any grossly unfair clause concerning payment terms, default interest, or recovery costs; the exclusion of default interest is considered grossly unfair. The amendments introduced by Legislative Decree No. 192 of 2012, applicable to commercial transactions concluded from January 1, 2013, can be consulted in the publication of Legislative Decree No. 192/2012 in the Official Journal.
Additional damages from liquidity crisis must be proven
Additional loss requires further proof. More expensive borrowing or the loss of a concrete business opportunity can matter only to the extent caused by the delay and not already covered by interest. Article 1224 of the Civil Code also excludes additional damages where the rate of default interest has been agreed. The contract, applicable rules and records must therefore be considered together, avoiding double recovery.
The causal link is the decisive point. It is not sufficient to show that the company had low liquidity during the same period. It is necessary to be able to explain why that specific breach made a certain financing necessary, caused an additional cost, or prevented a specific operation. If the same expense would have been incurred anyway, the connection with the delay weakens.
A missed opportunity requires verifiable elements. Saying that you lost future clients or possible earnings is not enough. Data that makes the concrete business recognizable are needed: a proposal, a non-accepted order, financing documents, communications with suppliers, or other elements capable of connecting the failure to collect to the alleged economic consequence. Compensation is not meant to cover every business difficulty, but the prejudice that depends on the delay.
Proof of damage must be distinguished from proof of credit. Contract, order, and delivery document serve first of all to demonstrate that the service was due and performed. Bank statements, financing conditions, debited interest, commercial correspondence, and documents of the missed operation can instead serve to prove the additional damage. Mixing the two levels often leads to confused requests that are easier to contest.
Agreement, formal request, and injunction order
A payment request must indicate a clear position. It is useful to identify the invoices, the remaining principal, the due date, the requested interest, and the reasons why you consider any expenses or additional damages due. Attaching or recalling the contract, order, delivery documents, and acceptance communications prevents the confrontation from being reduced to a simple opposing statement on the fact that the invoice exists.
Installment payments can be a solution, not a waiver. If the debtor acknowledges the debt but does not have the entire sum immediately available, a written plan can reduce uncertainty and distribute the payment over time. However, the text must clarify amounts, installment dates, the fate of accrued interest, and the consequences of any failure to pay an installment. A generic promise of payment "as soon as possible" does not offer the same level of precision.
The injunction order is useful when the credit is documentable. Article 633 of the Code of Civil Procedure allows requesting an injunction order for sums of money when the right results from written proof. For certain business and professional credits, Article 634 considers the electronic invoice transmitted via the Interchange System as suitable written proof as well; the amendment is reported in the Official Journal of November 11, 2024. This does not eliminate a possible contestation on the execution or conformity of the service.
Obtaining a measure does not always equate to collecting immediately. If the debtor files an opposition, the dispute may continue to ascertain the credit. Even in the absence of opposition, actual recovery depends on the existence of attachable assets, credits, or availability. Before choosing an action, it is therefore useful to evaluate together the documentary solidity of the credit, the defenses already formulated by the debtor, and the concrete economic utility of the recovery.
Frequently asked questions
Can I claim default interest even without sending a formal notice?
Yes, in commercial transactions, interest can accrue automatically. Legislative Decree No. 231/2002 links it to the day following the payment due date, without requiring prior formal notice of default. However, the formal notice remains useful to precisely indicate invoices, requested sums, and documents on which the credit is based.
Can I obtain 40 euros for each unpaid invoice?
Yes, for each late-paid commercial transaction evidenced by an invoice, where the statutory requirements are met. The Court of Justice in case C-585/20 clarified that combining several invoices in one claim does not reduce the entitlement to €40 in total. It is not multiplied for each reminder concerning the same invoice. Additional recovery costs require justification.
Is the electronic invoice enough to obtain an injunction order?
The electronic invoice transmitted via the Interchange System can constitute suitable written proof in the cases provided for by Article 634 of the Code of Civil Procedure. However, it does not replace every other proof when the debtor contests the contract, delivery, performed activity, or amount. Orders, agreements, transport documents, and correspondence often remain decisive.
Can I claim damages for financing taken out due to unpaid amounts?
It is possible to claim additional damages, but they must be proven. You must show the actual cost of the financing and the concrete connection with the non-payment. If the financing was necessary for other business reasons or was already normally used, it is not correct to automatically attribute all its cost to the delayed debtor.
If the client proposes to pay in installments, do I lose the right to interest?
Not necessarily, but the written agreement must clarify it. An installment plan can provide for the payment of already accrued interest, their different regulation, or an agreement on the overall balance. It is important to indicate amounts, deadlines, and consequences of failing to pay an installment, so as to leave no doubts about the remaining credit.
References and choice of the next step
The useful rules are few, but they must be applied to the correct facts. For transactions between businesses or with the public administration, the central reference is Legislative Decree No. 231/2002; for written proof in monitoring proceedings, Articles 633 and 634 of the Code of Civil Procedure are relevant. The invoice must be read together with the agreements and the proof of performance.
Before formulating a complete request, separate the items. Principal, default interest, recovery costs, and additional damages respond to different prerequisites. If the unpaid amount is affecting the continuity of your company's payments, you can contact me to evaluate which sums are sustainable and which path is most consistent with the available documents.