Tax drawer: how to find the documents for the INPS CU 2026

To correctly complete the CU Inps 2026 - formerly called CUD - it is necessary to have access to a series of up-to-date tax documents. These are certificates, invoices and other information useful for accurately reconstructing one’s tax position. In this case, you can consult the tax drawer. The service, provided by the Revenue Agency, allows taxpayers to access tax information. Like an archive, it allows taxpayers to consult: 

• personal details;

• tax documents submitted in the past; 

• refunds received;

• payments made with the F24 form;

• asset data relating to property and assets.

From your tax drawer it is also possible to access the Revenue Agency’s e-invoicing service, which allows you to create, send and consult e-invoices. 

For entrepreneurs and professionals, this activity can become complex, especially when there are multiple document flows or multiple tax positions. In this article we will see how the tax drawer works and how it is possible to automate the download of e-invoices with the A-Cube APIs.

How to access the tax drawer

To access the Revenue Agency’s tax drawer you need to log in to the portal’s reserved area. To do so, you can authenticate using one of three methods: 

• SPID, that is the Public Digital Identity System; 

• CIE, that is the Electronic Identity Card; 

• CNS (National Services Card). 

In addition to accessing it yourself, it is possible to delegate access to the tax drawer to a maximum of two authorised intermediaries. For example, your accountant or a company employee for the CU Inps. 

Where to find invoices and receipts in the tax drawer

From the tax drawer it is possible to download invoices, receipts and documents useful for the completion of the CU Inps 2026. After logging in, you need to enter the “Consultation” area. To download documents from the tax drawer, you can click on the invoice details to view it and then download it in PDF or XML. It is also possible to carry out bulk downloads from the tax drawer to download batches of invoices. In this case, you can make a maximum of three requests per day. A limit which, for entrepreneurs and professionals with large volumes, represents a significant slowdown in workflows.

For entrepreneurs and professionals, in fact, the tax drawer is not just a consultation tool but a true working tool. It allows you to:

• check that the documents useful for the return are complete;

• check for any discrepancies between issued and received invoices;

• retrieve documentation in the event of audits or inspections;

• monitor tax flows over multiple periods.

The critical point? When workloads grow, manual management becomes inefficient and risky. Professionals, entrepreneurs and taxpayers who need to download documents in bulk from the tax drawer can rely on the API solution designed by A-Cube.

How to automate bulk invoice downloads with the APIs

To facilitate some operations related to the documents essential for the single certification and beyond, at A-Cube we developed the API for Bulk download from the tax drawer. It is a solution that allows you to fully automate the document download process in a secure and compliant way. And proceed with submitting the CU Inps 2026 without stress. Thanks to the API, it is possible:

• automatically download sent and received invoices every day;

• convert data into ready-to-use formats such as XML, PDF, JSON or CSV;

• set up automatic notifications to monitor flows consistently;

• manage access, credentials and deadlines centrally for different clients or business units;

• redirect downloaded documents to the systems used within the company.

In addition, the API allows you to consult the documents for up to 2 years after download, whereas in the tax drawer they remain available for a maximum of 15 months after being downloaded. The VAT numbers that can be connected to the service are unlimited. 

The API is also useful beyond tax deadlines and can become a real ace up the sleeve in managing the day-to-day work of practices and companies. Automation makes it possible to avoid missing documents, always have up-to-date data, reduce transcription errors and speed up accounting closures. In essence, it is a true synchronisation of the tax drawer with your company systems. For entrepreneurs and professionals, all this means turning an operational activity into a structured and scalable process. To use the API, you need to provide a delegation to A-Cube. 

How tax drawer delegation works

In general, to grant delegation to access the tax drawer, you can do so either online or at the Revenue Agency offices. The intermediary themselves can also make the request if they have a signed delegation plus a copy of the identity document. For delegated consultation, the intermediary must have the activation code sent by the Revenue Agency to the taxpayer’s address.

To use the Bulk download from the tax drawer API as well, it is necessary to authorise A-Cube through the official procedures of the Revenue Agency. Once the delegation has been granted, we at A-Cube take care of notifying the expiry of the login passwords for the Revenue Agency portal. Passwords are renewed every 90 days and can be done directly from the link received by e-mail without accessing the AdE portal. 

Integrating the API with company ERPs: the benefits

The API is designed to integrate easily with management systems and ERPs. This makes it possible to turn the retrieval of tax documents into an automatic, continuous and much more reliable process. 

Invoices and other files downloaded from the tax drawer can be routed directly into the systems already in use within the company, avoiding manual tasks, repetitive uploads and possible input errors. In this way, the data is always kept up to date and consistent between administration, accounting and customer management, with a positive impact on both internal operations and service quality. 

The integration also makes it possible to improve control over document flows, traceability of operations and availability of information for reports, checks and audits. For businesses managing multiple companies, multiple clients or large volumes of documents, this approach makes processes much more scalable, standardised and easier to manage. 

Teams’ work can also benefit, reducing the time spent on low-value activities and freeing up more resources for analysis, planning and business support. 

For more information, you can consult the developer guide or contact the support service, which is always available.

Ready for the CU Inps 2026,
with the A-Cube API

When it comes to completing the Single Certification, it can become clear how some company processes can be improved. Automating access to and downloading of documents with the Bulk download from the tax drawer API means saving time, reducing errors and improving data control. And above all, allowing the company to focus on higher-value activities. Do you want more information or to know how to try the service? Write to info@acubeapi.com: our team is also available to organise a personalised demo based on your business needs.