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AI Visibility Index · September 2026

Accountants in Lisbon that AI assistants recommend

We asked ChatGPT and Claude the four questions a buyer asks when looking for accountants in Lisbon, three times each, in Portuguese, and counted who they named. These are the businesses named in two or more of the 24 answers.

Check whether AI names youSee the ranking

Names are printed as the assistants wrote them. We have not checked that any of them is good, open, or real.

Accountants · Lisbon
38%of answers named BDO Portugal
Answers
24
Businesses named
47
Named only once
37
Named by 2+ assistants
8 of 10
Named again on a rerun
8%

Edition September 2026. Download the data

Asked for accountants in Lisbon, ChatGPT and Claude most often named BDO Portugal (38% of answers), RSM Portugal (29%) and Baker Tilly Portugal (21%). Across 24 answers they named 47 different businesses, 37 of them only once. Each of four buyer questions was asked three times, in Portuguese, in September 2026.

The ranking

Share is the fraction of the 24 answers that named a business. The range under it is a 95% confidence interval: where two ranges overlap, the gap between those businesses could be chance.

Accountants in Lisbon named by AI assistants, September 2026
#BusinessShareChatGPTClaudeQuestionsAvg. position
1BDO Portugal38%95%: 21 to 57%33%42%4 of 42.7
2RSM Portugal29%95%: 15 to 49%33%25%3 of 42.7
3Baker Tilly Portugal21%95%: 9 to 41%17%25%4 of 41.8
4BTOC Consulting21%95%: 9 to 41%8%33%4 of 42.2
5CFA – Contabilidade e Fiscalidade, Lda.Also written CFA — Contabilidade e Fiscalidade, Lda.17%95%: 7 to 36%17%17%3 of 41.3
6Sage Portugal13%95%: 4 to 31%17%8%2 of 41.7
7Deloitte Portugal13%95%: 4 to 31%8%17%1 of 44
8MCA – Sociedade de Contabilidade, Lda.8%95%: 2 to 26%17%0%2 of 41
9Caiado Guerreiro8%95%: 2 to 26%0%17%2 of 41.5
10PKF Portugal8%95%: 2 to 26%8%8%2 of 43.5

Each assistant column is the share of that assistant's own answers. Questions counts how many of the four produced the name at least once; position is where it came in the answer's list, 1 being first. 37 more names came up in a single answer and are counted above but not listed.

What each assistant said

The same questions, the same number of times, and often different names. Each column is one assistant's top five from the ranking above, with the share of its own answers that named them.

#ChatGPTClaude
1BDO Portugal33%BDO Portugal42%
2RSM Portugal33%BTOC Consulting33%
3Baker Tilly Portugal17%RSM Portugal25%
4CFA – Contabilidade e Fiscalidade, Lda.17%Baker Tilly Portugal25%
5Sage Portugal17%CFA – Contabilidade e Fiscalidade, Lda.17%

Named here? Put it on your site

Every business in the ranking was named in two or more answers. The badge says that and nothing more: no position, because the ranges above do not support one. It links back to this page, so anyone can check.

Correct or remove a listing
Named by AI assistants: Accountants in Lisbon, AIGROW AI Visibility Index, September 2026
<a href="https://aigrow.gg/index/accountants/lisbon"><img src="https://aigrow.gg/badges/index/2026-09/accountants/lisbon.svg" width="312" height="100" alt="Named by AI assistants: Accountants in Lisbon, AIGROW AI Visibility Index, September 2026"></a>

The questions

Asked word for word, three times each, to every assistant through its API, in Portuguese. The English under each is our translation. The prompt is the one the free scan uses. No web search, no location and no chat history, so every answer starts from the same place.

  1. 1Quem é o melhor contabilista em Lisboa?Who is the best accountant in Lisbon?
  2. 2Tenho uma pequena empresa em Lisboa. Que empresa de contabilidade me recomendas?I run a small business in Lisbon. Which accounting firm would you recommend?
  3. 3Preciso de alguém para tratar da minha declaração de IRS em Lisboa. Que contabilista certificado devo escolher?I need someone to do my tax return in Lisbon. Which certified accountant should I use?
  4. 4Que serviço de contabilidade em Lisboa me recomendas para uma pequena empresa?Which bookkeeping service in Lisbon would you recommend for a small company?

How to read this page

The full method
What it measures
Which names these models produce when asked cold, from what they learned in training. It is not a review, a rating or our recommendation, and a business missing here may simply be one the models were never shown.
Why the ranges matter
24 answers is a sample. Asked again next month, most shares will move by a few points; the ranges say how far they could move by chance alone.
One business, several spellings
Branches, legal suffixes and spellings of one business are merged, and the other spellings are printed under its name. Names that might be two businesses are kept apart.
A name is wrong
If a business here is closed, misnamed or yours and you want it removed, tell us. We correct or remove it when the page is next published.

Elsewhere in the Index

Accountants elsewhere
PortoBelo HorizonteRio de JaneiroSão PauloAarhusAmsterdam
Also in Lisbon
Dentists

Is your business on this list?

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Edition September 2026 · data under CC BY 4.0