Understandify Ab Oy, VAT ID FI34158009 — Verified
Active and verified against VIES as of 14 Sep 2026.
Confirmed against VIES on 14 Sep 2026, 00:57 UTC
Check ID: 01a09d6b-2a94-793f-82aa-7ef14c638b4b
VAT ID
FI34158009
Y-tunnus
3415800-9
Company
Understandify Ab Oy
Company type
Limited company
Founded
16 Jan 2024
Industry
Computer programming activities
Address
Såggatan 2
65170 VASA
FINLAND
VAT rates in Finland (EUR)
Standard
25.5%
Reduced
13.5%
Reduced
10%
VAT rates as of 10 Nov 2026
The registry details on this page come from the Finnish Patent and Registration Office (PRH) open data, published under CC BY 4.0, and were retrieved no earlier than the check time above. The company name and address come from VIES.
How FI34158009 is built
The prefix FI marks Finland, where VAT is known locally as Arvonlisävero (ALV). The part after it, 34158009, is 8 digits. The whole number follows the format FI + 8 digits. The characters after the prefix correspond to the Y-tunnus 3415800-9.
For Understandify Ab Oy, its registered company type is Limited company; the national register or authority record gives a registration date of 16 Jan 2024, 2 years before the check; its Y-tunnus is 3415800-9.
Related: Finland VAT number format · VAT number formats in the EU · EU VAT rates · What is VIES · VAT audit trail · Finland VAT API
Other checked VAT numbers in Finland
Embed this verification on your site
Paste the inline tag where the badge should appear (impressum, footer, About page) and drop the script anywhere on the same page – it works even if your framework moves <script> to the end of <body>.
Preview
Snippet
<script async src="https://vatnode.dev/badge.js"></script> <span data-vatnode-vat="FI34158009"></span>
Loads asynchronously, ~1.5 KB gzipped, no tracking, no dependencies. The badge links to this page, which shows the result stored for FI34158009 as of 14 Sep 2026.
Validating VAT in your app? Use the VAT validation API — 100 free calls, no credit card required.
Get API Keycurl "https://api.vatnode.dev/v1/vat/FI34158009" \ -H "Authorization: Bearer YOUR_API_KEY"
{
"valid": true,
"vatId": "FI34158009",
"countryCode": "FI",
"countryName": "Finland",
"companyName": "Understandify Ab Oy",
"companyAddress": "Såggatan 2\n65170 VASA",
"companyRegistrationDate": "2024-01-16",
"companyForm": "Limited company",
"industryDescription": "Computer programming activities",
"registryCode": "3415800-9",
"registryCodeName": "Y-tunnus",
"taxId": "3415800-9",
"taxIdName": "Y-tunnus",
"registryPrivacy": false,
"website": null,
"commercialName": null,
"companyStatus": null,
"secondaryActivities": [],
"companyAgeYears": 2,
"consultationNumber": null,
"specialTerritory": null,
"verifiedAt": "2026-09-14T00:57:21.301Z",
"checkId": "01a09d6b-2a94-793f-82aa-7ef14c638b4b",
"source": "VIES",
"countryVat": {
"vatName": "Arvonlisävero",
"vatAbbr": "ALV",
"currency": "EUR",
"standardRate": 25.5,
"reducedRates": [
13.5,
10
],
"superReducedRate": null,
"parkingRate": null,
"vatNumberFormat": "FI + 8 digits",
"vatNumberPattern": "^FI\\d{8}$",
"identifiers": {
"registryAuthorityName": {
"fi": "Patentti- ja rekisterihallitus",
"sv": "Patent- och registerstyrelsen",
"en": "Finnish Patent and Registration Office"
},
"registryName": {
"fi": "kaupparekisteri",
"sv": "handelsregistret",
"en": "Trade Register"
},
"registryCodeName": {
"fi": "Y-tunnus",
"sv": "FO-nummer",
"en": "Business ID"
},
"taxIdName": {
"fi": "Y-tunnus",
"sv": "FO-nummer",
"en": "Business ID"
},
"vatIdName": {
"fi": "arvonlisäverotunniste",
"sv": "momsnummer",
"en": "VAT number"
}
},
"countryVatUpdatedAt": "2026-11-10"
}
}Need a VIES Consultation Number?
This public check doesn't issue a VIES consultation number, the reference that documents who checked a VAT number and when. Authenticated API calls that set your own EU VAT as the requester return one.
Validate a different VAT ID
Automate this in your app
Use the vatnode API to automate VAT validation in your invoicing or checkout flow. Free plan available, no credit card required.