During Spain's annual income tax campaign — filed online from 8 April to 30 June 2026, per the Spanish Tax Agency's (Agencia Tributaria) official calendar — and at every quarterly VAT closing (Modelo 303, filed 1-20 April, July and October, and 1-30 January for the fourth quarter), the phone at any Spanish tax advisory or accounting firm (asesoría or gestoría) rings off the hook: clients asking about their case status, requesting an appointment with their advisor, or chasing a document already sent. An AI voice agent absorbs that spike without hiring temporary staff, resolving repetitive queries and freeing the human team's time for what genuinely requires professional judgment: the tax or labour-law interpretation of the case.
Spanish tax advisories and accounting firms (gestorías) live by a calendar of sharply concentrated call spikes. The Spanish Tax Agency (Agencia Tributaria) sets online filing for the 2026 Income and Wealth Tax campaign between 8 April and 30 June, with its phone assistance plan ("Le Llamamos") starting on 6 May; and, separately from income tax, the same pattern repeats every quarter with VAT (Modelo 303): filed 1-20 April, July and October, and 1-30 January for the fourth quarter. During those windows, call volume from clients asking about deadlines, pending paperwork or the status of their case can multiply several times over a normal month, and hiring temporary staff to handle it doesn't always pay off, nor is it easy to train in time.
Summum IA's AI voice agent handles those calls conversationally: it confirms receipt of paperwork, reports on case status, books or reschedules the appointment with the advisor, and answers frequent questions about deadlines and procedures, immediately handing off to a person at the firm as soon as the query requires actual tax or labour-law judgment. It doesn't replace or compete with Summum IA's Copilot for Tax and Accounting Firms (Copilot para despachos y asesorías): that one is the internal document assistant that helps the professional query case files, regulation and case law via RAG; this is the firm's voice channel for client-facing service, the outward layer of the same operation. Both services integrate with the practice management software already in place — a3, Sage Despachos, Wolters Kluwer — without needing to replace tools or duplicate configuration work.
The legal fit is explicit, and it is itself the service's selling point: Article 66.1.a of Law 11/2022, of 28 June, on General Telecommunications (BOE-A-2022-10757, Spain's Telecoms Act) prohibits automated calls without human intervention for commercial communication purposes when the user hasn't given prior consent. This agent never dials out or prospects: it only answers calls that the firm's own client chooses to make, so it falls outside the scenario the law restricts. On top of that, Article 50 of Regulation (EU) 2024/1689 (the AI Act) — whose transparency obligations become fully applicable on 2 August 2026 — requires the agent to disclose, unambiguously, at the start of every call, that the other party is an AI system. The personal and tax data handled during the call is also covered by the same data-protection framework already provided by Summum Consultoría's GDPR service for tax advisories and accounting firms.
We analyse the firm's call history — or, where none exists, the sector's typical pattern — to identify peak periods: the income tax campaign (April-June), quarterly VAT and payroll closings, and other tax-form deadlines. We determine which queries recur most often and are candidates for fully automated voice resolution.
We build the conversation script using the firm's real vocabulary and processes: case status, pending paperwork, appointment management, filing deadlines. We define precisely when the agent resolves the query and when it transfers the call to staff, avoiding any answer that would amount to specific tax or labour advice.
We connect the agent to the firm's telephony (SIP/VoIP or cloud PBX) and, where applicable, to the same practice-management software the team already uses — a3, Sage Despachos, Wolters Kluwer — so it can check the real status of each case without relying on a parallel database.
We put the agent into production before the relevant income tax campaign or quarterly closing begins, with a monitoring dashboard for volume, autonomous resolution rate and escalation reasons. We review performance after each peak and retrain the agent using real calls.
The operational detail: what we deliver as part of the work and what we keep alive afterwards.
Conversational blueprint for tax and accounting firms
Documented decision-node diagram tailored to the firm: case status, pending paperwork, appointment scheduling and exact conditions for escalating to a human advisor.
Voice agent trained on tax and labour-law vocabulary
Spanish voice recognition and neural speech synthesis tuned to income tax, VAT, payroll and standard advisory-firm terminology.
Integration with phone system and practice-management software
SIP/VoIP connector or API to the firm's cloud PBX, plus integration with the practice-management software already in place (a3, Sage Despachos, Wolters Kluwer) to check the real case status.
AI Act Article 50 compliance
AI disclosure at the start of every call and technical marking of the generated audio, in line with the transparency obligations of Regulation (EU) 2024/1689, applicable from 2 August 2026.
Explicit fit with Article 66.1.a of the Spanish Telecoms Act
Documentation that the service operates strictly in inbound mode, outside the scenario of automated commercial calls without consent that Law 11/2022 restricts.
Seasonal-spike monitoring dashboard
Dashboard tracking call volume by time slot, autonomous resolution rate and transfer reasons, with dedicated views for the income tax campaign and quarterly VAT closings.
The firm's phone service works alongside two sister services within Grupo Summum: Summum IA's Copilot for Tax and Accounting Firms, which handles the professional's internal document work, and Summum Consultoría's GDPR service for tax advisories and accounting firms, which protects the personal and tax data the voice agent handles on every call.
The Copilot for tax and accounting firms queries case files, regulation and case law for the professional; the voice agent handles the client by phone. Two layers — internal and external — of the same firm, with no overlap in function.
View service → consultoríaSummum Consultoría protects the personal and tax data in the case files that the voice agent looks up and updates during each call, in line with GDPR and the sector's professional-secrecy obligations.
View service →The Copilot for tax and accounting firms is an internal document assistant: it helps the professional query the firm's own case files, Spain's Official Gazette (BOE), the Tax Agency (AEAT) and case law via RAG. This voice agent is the firm's telephone channel for client service: it takes the call, resolves repetitive queries and hands off to staff when the case requires it. They are two layers of the same firm — internal work and external service — that integrate with each other without duplicating function or keyword.
Yes, in inbound mode. Article 66.1.a of Law 11/2022, of 28 June, on General Telecommunications (BOE-A-2022-10757) prohibits automated calls without human intervention for commercial purposes when the user hasn't given prior consent. This agent never dials out or prospects: it only answers calls the client chooses to make to the firm, so it falls outside the scenario the law restricts.
Yes. Article 50 of Regulation (EU) 2024/1689 requires unambiguous disclosure that the other party is interacting with an AI system, with transparency obligations fully applicable from 2 August 2026. Every voice agent we deploy includes the AI disclosure at the start of the call and technical marking of the generated audio.
The 2026 Income and Wealth Tax campaign is filed online from 8 April to 30 June (Agencia Tributaria), and a similar spike repeats every quarter with VAT — Modelo 303, filed 1-20 April, July and October, and 1-30 January. During those windows the agent absorbs repetitive calls (case status, pending paperwork, appointment with the advisor) so the firm's team can spend that time on cases that genuinely require professional judgment.
Yes. The agent connects via API to the practice-management programs most common in Spanish firms — a3, Sage Despachos, Wolters Kluwer, among others — to check the real case status during the call, without needing to keep a parallel database or switch software.
It's handled under the same data-protection framework the firm already applies, reinforced by Summum Consultoría's GDPR service for tax advisories and accounting firms, which specifically covers tax and labour-law case files and the sector's professional-secrecy obligations.