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Make your donationAbout Heinz Sielmann Stiftung
DZI-certified organisation. Main areas of work: education, education and campaigning, animal welfare, environmental and nature conservation.
DZI-zertifizierte Organisation. Arbeitsschwerpunkte: Bildung, Bildungs- und Kampagnenarbeit, Tierschutz, Umwelt- und Naturschutz.
Translated from German by GiveRadar.
Verified certifications
Confirmed against the issuing authority - not self-reported.
Focus areas & reach
· What they work on and whereHow it stacks up against peers
· vs. 8 similar international in GermanyConcerns
· None foundGiveRadar Analysis
Original analysis from GiveRadar's dataset of comparable organizations
From what GiveRadar has verified so far, Heinz Sielmann Stiftung has a substantially complete profile, cross-referenced across 3 independent sources.
- GiveRadar has verified financial records for only 2% of international charities in Germany, and this is one of them. See national comparisons
- It has more complete contact information than nearly all comparable organizations, with a verified website, email, phone and address on record. See national comparisons
- GiveRadar holds a more complete profile for this organization than for 96% of the 29,261 international charities in Germany it tracks, because GiveRadar has verified its contact details. Most of those have little verified data on record yet. View this cohort
- financial records
- a website
- a contact email
- a donation page
- leadership details
- third-party accreditation
- an owner-submitted profile claim
Analysis based on GiveRadar's benchmark dataset of 2026-07-03. It describes what GiveRadar has verified, not a judgment of the organization itself.
Common questions
· Auto-generated from filings + methodologyHeinz Sielmann Stiftung is a registered international nonprofit based in Duderstadt, Lower Saxony, Germany. It is registered with the German Vereinsregister (Association Register). GiveRadar's Integrity Assessment for the organization is 47/100, which reflects how much public information is available, not whether the charity is legitimate. The organization reports €14M in annual revenue. The charity has 1 community review with an average rating of 5.0/5. On Trustpilot, it has a rating of 3.7/5 based on 1 review.
Heinz Sielmann Stiftung has a GiveRadar Integrity Assessment of 47/100. This score combines five components: Registration (20 pts), Financial Transparency (30 pts), Governance (20 pts), Contact Availability (10 pts), and Data Recency (20 pts), with negative adjustments for any red flags. A score of 47 ('Partial transparency') means some public data is on file but key signals are missing - worth a closer look before donating. For comparison, the average integrity assessment for international charities in Germany is 64/100.
Heinz Sielmann Stiftung is located in Duderstadt, Lower Saxony, Germany.
Based on official tax filings, Heinz Sielmann Stiftung has €14M in annual revenue. Its revenue is significantly above the peer average of €6M. Create a free GiveRadar account to view the complete financial breakdown with year-over-year trends.
Heinz Sielmann Stiftung is classified as an International organization, registered in Germany. By size, it is categorized as a large organization. It has €14M in annual revenue.
According to GiveRadar's records, Heinz Sielmann Stiftung is registered with the German Vereinsregister (Association Register) and overseen by the local Amtsgericht (district court). The organization has a moderate Trustpilot rating of 3.7/5. You can donate directly through their official donation page linked on their GiveRadar profile. GiveRadar provides data for research and does not endorse any organization. A GiveRadar Integrity Assessment reflects how much public data is available, not whether an organization is safe to donate to, so it is always smart to do your own research before giving.
DZI-certified organisation. Main areas of work: education, education and campaigning, animal welfare, environmental and nature conservation. Heinz Sielmann Stiftung is classified as an international organization registered in Germany.
Among international charities registered in Germany: Its annual revenue of €14M is well above the peer average of €6M.
Heinz Sielmann Stiftung is a registered nonprofit in Germany. Donations to recognized charitable organizations (gemeinnuetzige Organisationen) are tax-deductible up to 20% of your total income. You will need a donation receipt (Zuwendungsbestaetigung) from the organization for your tax return.
You can verify Heinz Sielmann Stiftung's charitable status in several ways. First, check the Zuwendungsempfaengerregister (ZER) at https://www.bzst.de/DE/Unternehmen/Zuwendungsempfaengerregister_organisation/zuwendungsempfaengerregister_organisation_node.html - the BZSt maintains this federal register of all organisations eligible to receive tax-deductible donations in Germany. Second, you can look up the association in the Vereinsregister (association register) at the local Amtsgericht (district court) via https://www.handelsregister.de/ - this confirms the legal form, registered address, and board members. Third, check whether the organisation holds the Freistellungsbescheid (tax-exemption notice) from its local Finanzamt - the notice is re-issued every three years and confirms the 'gemeinnuetzig' status under the Abgabenordnung. Legitimate charities publish this on their website or provide it on request.
You can donate to Heinz Sielmann Stiftung directly through its donation page (https://www.betterplace.org/de/organisations/9019-heinz-sielmann-stiftung). German charities typically accept SEPA bank transfer (Ueberweisung) to the organisation's IBAN, SEPA direct debit (Lastschrift/Einzugsermaechtigung) for recurring donations, PayPal, credit card payments, and online payment processors like Stripe or Mollie. Many German charities use platforms like betterplace.org, GoFundMe, or their own Spendenseite (donation page). International donors can give via SEPA transfer (Germany is in the eurozone) or PayPal. For your donation to be tax-deductible, you need a Zuwendungsbestaetigung (donation receipt) from the organisation - for amounts up to 300 euros, a bank statement showing the transfer is sufficient.
Yes, Heinz Sielmann Stiftung carries the DZI Spenden-Siegel - Germany's most widely recognised quality seal for charitable organisations, awarded by the Deutsches Zentralinstitut fuer soziale Fragen (DZI). To qualify, a charity must pass an annual independent audit covering: truthful and transparent advertising, ethical fundraising practices, sound financial management (administrative and fundraising costs must be reasonable relative to total expenditure), clear governance structures, and effective internal controls. The DZI currently awards the Spenden-Siegel to roughly 230 German charities. You can look up the full assessment at https://www.dzi.de/.
Heinz Sielmann Stiftung is based in Duderstadt, in the state of Lower Saxony (Niedersachsen) in northwestern Germany, home to Hanover. Germany is a federation of 16 states (Bundeslaender). Charitable status ('Gemeinnuetzigkeit') is granted by the local Finanzamt and recognised nationwide - the organisation can solicit tax-deductible donations from donors anywhere in Germany.
See 5 years of revenue, expense breakdowns, and balance sheet.
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Tax-deductibility for donors
German donations are deductible if Heinz Sielmann Stiftung holds a Freistellungsbescheid (recognition as a charitable purpose) and issues a Zuwendungsbestätigung receipt.
Heinz Sielmann Stiftung is in Germany, a TGE (Transnational Giving Europe) member country. Dutch donors can route gifts via Stichting Transnational Giving Europe to receive Dutch ANBI-equivalent deductibility, subject to TGE's 5% pass-through fee.
Heinz Sielmann Stiftung is registered in Germany. US donors generally cannot deduct gifts to non-US charities directly. To claim a deduction, route the gift through a US 'Friends of' fiscal sponsor or a donor-advised fund that performs equivalency determination (IRS Rev. Proc. 92-94).
Always confirm tax treatment with the charity directly or your tax advisor before donating.
We check government filings and charity disclosures quarterly. If you represent this charity, claim this page to add officers directly.
Latest news
From global news sources
No recent news coverage found
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Donor reviews (1)
5.0 / 5 average · includes imported Trustpilot
Wir kommen immer wieder gern hier her.Unser kleiner Racker hat hier immer richtig viel Spaß, ob er nun auch Tiere füttert oder Ihnen einfach nur zusieht, Jonas macht jedesmal einen richtig zufriedenen und fröhlichen Eindruck wenn wir uns hier auf dem Gut Herbigshagen herumtreiben.Der weitläufige Außenbereich lädt zu ausgedienten Spaziergängen ein und das Highlight für unseren kleinen ist natürlich immer wieder der Nachbau des KIKA Baumhauses welches hier steht.Im Innenbereich gibt es eine tolle multimediale Austellung über das Leben und Wirken von Heinz Sielmann, dem vielleicht größten deutschen Tierfilmer. An vielen Stationen kann man Filme auf Fernsehern oder dem Rundkino sehen und über Kopfhörer die entsprechenden Informationen bekommen.Meine Mutter war beim letzten Besuch auch begeistert, besonders natürlich auch von dem kleinen Cafe, in dem man bei einer zünftigen Brotzeit oder Kaffe und Kuchen rasten kann.Schaut unbedingt mal rein, wenn Ihr in der Gegend seid.
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Sign up to write a reviewCause areas in Germany
How many charities work in each area, with this charity's area highlighted.
Most common causes in Germany
Causes charities work on most.
Sources and verification
- Registration and legal identity
- Bundesanzeiger (German Federal Gazette)
- Financial filings
- Bundesanzeiger annual disclosures
- Donor reviews (external)
- Trustpilot consumer reviews
- Community reviews (verified email)
- GiveRadar Community Reviews - 1 verified review(s) on file.
Data freshness
What we know and don't know
Exactly which public data we hold on this charity. Our score reflects transparency, not impact.
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Financial data · Annual revenue figure on record
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Official website · On record
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Headquarters address · On file
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Direct contact · Email or phone published
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Tax-deductibility · Verified
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Named leadershipBoard and officer list not yet indexed
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Executive payTop-officer pay not disclosed
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Government registrationNo public registry ID
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Mission statementNo self-published statement of purpose
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Programs & activitiesNo named programs listed by the charity
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Founding dateYear founded not on file
Methodology
GiveRadar builds each profile primarily from official government charity registries, supplemented where available by third-party nonprofit databases and news archives, and combines it into a single 0-100 integrity assessment. The exact sources for this charity are listed above. We don't take a cut of any donation, ever.
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Quick facts about Heinz Sielmann Stiftung
- What is Heinz Sielmann Stiftung?
- Heinz Sielmann Stiftung is a international nonprofit organization based in Duderstadt, Germany. DZI-certified organisation. Main areas of work: education, education and campaigning, animal welfare, environmental and nature conservation.
- Where is Heinz Sielmann Stiftung located?
- Headquartered in Duderstadt, Lower Saxony, Germany.
- What is Heinz Sielmann Stiftung's annual budget?
- Annual revenue is approximately €10M-€100M.
- Is Heinz Sielmann Stiftung trustworthy?
- Heinz Sielmann Stiftung has a GiveRadar Integrity Assessment of 47 out of 100 (Partial transparency). The score reflects public-data transparency: registration, financial disclosure, governance, contact details, and how recently data was refreshed. It does not measure program impact.
- What is Heinz Sielmann Stiftung's website?
- http://www.sielmann-stiftung.de
- Are donations to Heinz Sielmann Stiftung tax-deductible?
- Donations may be tax-deductible for residents of Germany under local rules. US donors should check whether the charity has an equivalency-determination letter or a US-based fiscal sponsor before claiming a deduction.