The verdict in three sentences
For an international tax and fiduciary firm in Luxembourg, SEO captures precise searches on Google (domiciliation, substance, transfer pricing, CRS and FATCA reporting), while AEO/GEO works on how AI assistants like ChatGPT describe the firm when an executive or a family asks them for guidance. Both rest on the same foundation: factual pages per topic and per jurisdiction, an identifiable team, licences shown exactly as held. How you split the budget depends on your situation, and measurement uses Search Console on one side and a dated record of AI answers on the other.
SEO and AEO/GEO: how they differ for a fiduciary
Figures are a 2026 ballpark drawn from typical agency quotes in Luxembourg and the Greater Region and from public rate pages.
| Criterion | SEO | AEO/GEO |
|---|---|---|
| What it targets | Google positions for queries such as “company domiciliation Luxembourg” | Accurate mentions of the firm in answers from AI assistants like ChatGPT |
| Typical audience | Executive comparing providers | Executive or family office asking for a recommendation or an explanation |
| Time to effect | Usually 4 to 9 months | 3 to 6 months to read a trend, highly variable |
| Monthly market budget | EUR 2,000 to 6,000 | EUR 1,500 to 5,000 |
| One-off diagnostic | EUR 3,000 to 8,000 | EUR 2,500 to 7,000 |
| Metrics | Impressions, clicks, qualified enquiries | Share of answers citing the firm, accuracy of information |
| Main risk | Generic content of no value to an executive | Outdated or contradictory information picked up by AI assistants |
The Luxembourg market adds a difficulty: prospects search in French, German and English, more rarely in Luxembourgish. Each language is a content project in its own right, and a poorly translated page on substance or domiciliation does more harm than a missing one.
Where to invest depending on your situation
| Firm situation | Recommended priority | Indicative budget split | Why |
|---|---|---|---|
| Recent firm, little known | SEO first | 70% SEO, 30% AEO/GEO | You first need to exist on indexed, cited pages |
| Established brand, known in the market | Stronger AEO/GEO | 50% SEO, 50% AEO/GEO | AI assistants already mention you; it has to be accurate |
| Highly regulated content, slow sign-off | Focused SEO on few pages | 60% SEO, 40% AEO/GEO | Fewer pages, all of them flawless |
| Limited budget (under EUR 2,500 per month) | Diagnostic then core SEO | 80% SEO, 20% AI answer record | A quarterly record is enough to keep watch |
| International clients (Asia, the Americas) | English first in both | 50% SEO, 50% AEO/GEO | These clients often ask AI assistants in English |
| Multi-office firm (Luxembourg and other centres) | Architecture by jurisdiction | 60% SEO, 40% AEO/GEO | Avoid confusion between entities in answers |
At Kolonell this work is priced on quote: we start from your services, your languages and what Google and AI assistants show today.
Constraints specific to the profession
A fiduciary's clients judge licences, partners, jurisdictions covered and discretion. Depending on their status, firms are supervised by the CSSF or by their professional body, and published references must match the authorisations held exactly. No content should present a structure as a way to escape tax or promise a tax outcome. Forms and newsletters fall under the GDPR, overseen by the CNPD; for enquiries this sensitive, a secure contact channel is expected. This is not legal advice.
How to measure, and what a diagnostic covers
On the SEO side, Search Console provides impressions and clicks per query and per language; the CRM or inbox counts qualified enquiries per service. On the AEO/GEO side, measurement rests on a dated record: a fixed list of questions (for example “which Luxembourg fiduciary for a SOPARFI held by a Belgian family?”), put to AI assistants like ChatGPT every month, with the answer archived, whether the firm is mentioned and how accurate the description is.
In broad terms, a diagnostic covers the technical and content state of the site in each language, the queries where you are actually visible, a first record of AI answers, public inconsistencies (address, partners, licences, entities) and costed recommendations. It does not describe a recipe: it is there to decide where the money goes.
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Mini case study
*Illustrative example.* Fiduciaire Pétrusse Conseil, a fictional 25-person firm based in Kirchberg, has EUR 48,000 a year for visibility. An established brand, yet inaccurately described in 5 of 15 recorded answers, it opts for a 60/40 split: 48,000 × 0.6 = EUR 28,800 for SEO and 48,000 × 0.4 = EUR 19,200 for AEO/GEO, including a EUR 4,000 initial diagnostic. A single structuring mandate worth EUR 25,000 in annual fees covers more than half the spend. The monthly record will show whether accuracy improves, with no promise of recommendation.
FAQ
Do we have to choose between SEO and AEO/GEO?
Rarely: both rely on the same factual pages. The real question is the split, for example 70/30 for a recent firm or 50/50 for an established brand.
Which languages should we publish in for Luxembourg?
French, German and English cover most professional searches. For a mid-sized fiduciary, allow 20 to 40 pages per language, reviewed by a partner.
What does a diagnostic cost?
As a 2026 ballpark, EUR 2,500 to 8,000 depending on the number of languages and services. It usually includes a first record of 15 to 30 questions put to AI assistants.
How do we know whether AEO/GEO is working?
By comparing the dated record month after month: share of answers citing the firm, accuracy of licences and partners, pages cited as sources. You need at least 3 records to read a trend.
Can we be sure ChatGPT will recommend us?
No. No provider controls what an AI assistant says, and no serious provider promises a ranking on Google either. The commitment is to a scope and regular measurement.
Find out how AI assistants describe your firm. We compare what Google and AI assistants like ChatGPT show about your firm in French, German and English, then propose a reasoned budget split. Request a diagnostic quote: reply within 48 hours.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
