Case study: Backdated VAT Registration and Returns for an Amazon FBA Seller in Italy

When you store goods in an Amazon warehouse in another EU country, VAT can become complicated very quickly. If you exceed the EU OSS threshold or start storing in another country without realising what it implies, you may suddenly discover that you should have registered for VAT in that country months ago.

This case study shows how a German Amazon FBA seller faced this problem with stock in Italy, needed backdated VAT registration and returns, and turned to hellotax for a practical solution – including a clear exit plan and OSS setup for the future.

---

The Client: German Amazon FBA Seller With Stock in Italy

The client is a German company selling physical goods via:

• Amazon (exclusively as sales channel)

• Amazon FBA for warehousing and fulfilment

Key facts:

• Country of establishment: Germany

• Sales region: EU + UK, B2C

• Channels: Amazon only (no own webshop yet)

• Warehousing:

  • Germany (home country)

  • Italy (Amazon FBA warehouse)

• Turnover: Between €10,000 and €100,000 per year in the EU & UK

• VAT situation before contacting hellotax:

  • German VAT registration in place

  • OSS threshold (€10,000) exceeded since 2023

  • No Italian VAT registration, despite stock being stored in Italy

The client initially believed that OSS and Amazon’s internal VAT tools would “take care of everything”. Only when Amazon started insisting on an Italian VAT number did they realise they needed backdated VAT registration and returns in Italy to regularise the past periods.

If you wish to know more about how OSS works, read our article on OSS schemes.

---

The Challenge: OSS Threshold Exceeded + Storage in Italy

Two main issues came together:

1. OSS threshold exceeded since 2023

The client’s cross-border B2C sales had exceeded the €10,000 OSS threshold since 2023. This meant:

• They should have applied the customer’s country VAT on many sales, and

• They needed correct OSS returns and/or local VAT registrations where stock was stored.

The seller was already using OSS concepts in discussions with their tax advisor, but the implementation was incomplete and not fully aligned with the reality of Amazon FBA storage.

2. Storage in Italy without local registration

Because Amazon moved and stored their products in an Italian fulfilment centre:

• They triggered a local VAT registration obligation in Italy (due to stock being held there).

• Domestic Italian sales (IT warehouse → IT customer) are not covered by OSS and must be reported in local Italian VAT returns.

• Amazon began pushing for proof of Italian VAT registration – with the clear warning that the seller’s Amazon account could be restricted if this was not resolved.

The client now needed:

• Backdated VAT registration and returns in Italy, from the date of first storage.

• A way to determine that first storage date (which was not obvious from their internal files).

• A plan to stop storing in Italy from 1 January 2026 and handle future sales via OSS from Germany only.

They were under time pressure because Amazon’s deadline was approaching and the FBA account was at risk.

For an official overview of how the EU’s One Stop Shop works for cross-border online sales, you can also consult the European Commission’s guidance on the VAT One Stop Shop (OSS).

---

Why Backdated VAT Registration and Returns Were Needed

From a VAT point of view, the client could not simply “start from now”:

• Goods had already been stored in Italy for some time.

• Domestic Italian sales and intra-EU stock movements involving Italy had already taken place.

• Italian tax authorities could later discover this (e.g. via Amazon data) and demand:

  • Late registration

  • Backdated VAT returns

  • Interest and possibly penalties

To avoid that, the seller decided – together with their tax advisor – to:

1. Register for Italian VAT, backdated to the date when the first goods were stored in Italy.

2. Submit backdated VAT returns for all affected periods.

3. Deregister once all stock was removed from Italy and all obligations were closed.

4. Use OSS going forward for cross-border B2C sales from Germany (without foreign warehousing).

However, they were struggling to:

• Find the exact date of the first storage in Italy in Amazon reports.

• Understand how far back the backdated VAT registration and returns should go.

• Coordinate the registration, back filings and future deregistration as one coherent project.

This is where hellotax stepped in.

---

The Solution: Backdated VAT Registration and Returns in Italy With a Clear Exit Plan

hellotax proposed a structured, step-by-step project:

1. VAT Analysis: OSS + Local Italian Obligations

First, hellotax and the client clarified the full picture:

• Confirmed that the OSS threshold had been exceeded since 2023.

• Confirmed that goods were stored in an Italian Amazon FBA warehouse.

• Clarified which sales should be:

  • Reported locally in Italy (domestic IT sales from the Italian warehouse), and

  • Covered by OSS (cross-border B2C sales from Germany once warehousing in Italy is stopped).

This analysis made it clear that backdated VAT registration and returns in Italy were necessary and unavoidable if the client wanted to avoid future problems and keep their Amazon account safe.

2. Backdated VAT Registration in Italy

hellotax then set up the backdated Italian VAT registration:

• Preparation and submission of the registration file to the Italian tax office.

• Coordination of necessary translation work (official documents into Italian).

• Communication with the tax office regarding the intended backdating of the registration.

The client chose a monthly payment plan to keep flexibility:

• Registration fee (one-off)

• Translation cost (one-off)

• Monthly compliance fee from December until deregistration

• Backdated months to be billed once the first storage date was confirmed

This approach allowed the client to start immediately, without waiting until every historical detail was known.

3. Determining the First Storage Date via Amazon Integration

A key practical issue was:

“When exactly did we first store stock in Italy?”

Instead of continuing to search manually in Seller Central, hellotax proposed:

• Onboarding the client to the hellotax platform,

• Connecting Amazon data to the system, and

• Letting the system automatically detect the first warehouse movements into Italy.

This made it much easier to:

• Determine the periods that needed backdated VAT registration and returns.

• Avoid over- or under-declaring the past period.

• Have a consistent data basis for Italian VAT and future OSS work.

4. Backdated VAT Returns and Ongoing Italian Filings

Once the period was clear, hellotax handled the backdated VAT registration and returns in Italy:

• Preparation and submission of all historical VAT returns for Italy.

• Reporting of intra-community movements (e.g. DE → IT stock transfers) where required.

• Calculation of any Italian VAT payable for the past months.

For the current period, hellotax also:

• Took care of ongoing monthly VAT returns,

• Ensured deadlines were met,

• Used the Tax Letter Inbox to receive and translate any Italian tax office letters.

5. Deregistration and Switch to OSS from 1 January 2026

The client’s strategic goal was clear:

• Stop storing in Italy from 1 January 2026.

• Use OSS from Germany for cross-border B2C sales within the EU.

hellotax therefore built a full lifecycle plan into the project:

1. Backdated VAT registration in Italy.

2. Backdated VAT returns and clean-up of historical obligations.

3. Ongoing VAT returns until the last stock is sold or removed from Italy.

4. Deregistration of the Italian VAT number once stock is no longer stored there.

5. Configuration and support of the OSS scheme, so that:

   • Cross-border B2C sales are reported via German OSS, and

   • No new stock is moved to Italy (avoiding a renewed local obligation).

This is a good example of how backdated VAT registration and returns are not just a “firefighting” exercise but part of a wider strategy: cleaning up the past and designing a simpler, more centralised solution for the future.

---

Implementation Timeline

Although every case is different, the project followed these typical phases:

• Week 1–2:

  • VAT analysis (OSS + Italy)

  • Confirmation of obligations and scope

  • Decision on monthly plan vs. yearly plan

• Week 2–6:

  • Submission of backdated Italian VAT registration

  • Translations and communication with the Italian tax office

  • Amazon integration set up to detect the first storage date

• Once registration number is issued:

  • Preparation and submission of backdated VAT returns for the identified period

  • Settlement of any outstanding VAT plus interest

  • Start of regular monthly Italian VAT filings

• From 1 January 2026 onwards (target):

  • No more stock in Italy

  • Last Italian VAT returns and preparation for deregistration

  • Switch to OSS-only from Germany for cross-border B2C sales

---

Results: From VAT Risk to a Managed Exit

By working with hellotax, the client achieved:

• ✅ A clear understanding that they needed backdated VAT registration and returns in Italy – and why.

• ✅ A concrete plan to regularise all Italian VAT periods affected by storage and OSS threshold issues.

• ✅ A structured monthly fee model that matched their plan to exit Italy and avoid long-term commitments.

• ✅ Practical help to identify the first storage date in Italy via Amazon data, instead of relying on manual guesswork.

• ✅ Confidence that future sales can be handled via OSS from Germany, without re-creating the same problem in other countries.

Most importantly, VAT stopped being a vague, stressful risk tied to Amazon’s warnings – and became a managed, time-limited project with a clear end point.

---

What Other Amazon Sellers Can Learn

If you sell with FBA and store goods in other EU countries, you can use this case as a checklist:

1. Check the OSS threshold

   • Have your cross-border B2C sales within the EU exceeded €10,000 since 2021?

   • If yes, you probably need OSS and/or local registrations.

2. Check where Amazon stores your stock

   • If your goods are stored in another country (e.g. Italy, France, Spain, Poland), you may need local VAT registration there.

   • Domestic sales in that country are not covered by OSS.

3. If you missed a registration, act early

   • Ignoring the issue rarely makes it go away.

   • Often the right approach is backdated VAT registration and returns to clean up the past.

4. Align VAT with your logistics strategy

   • If you plan to stop storing in a country, you may combine:

     • Backdated registration

     • Backdated VAT returns

     • A planned deregistration once stock is removed

     • A switch to OSS-only from your home country

5. Use data, not guesswork

   • Your first storage date, warehouse flows and country-by-country sales should be backed by Amazon data.

   • A tool like hellotax can help extract and interpret that data.

---

How hellotax Helps With Backdated VAT Registration and Returns

For Amazon and marketplace sellers, hellotax can:

• Analyse your current setup (OSS, storage locations, marketplaces).

• Identify which countries require backdated VAT registration and returns.

• Handle:

  • Local registrations

  • Backdated and ongoing VAT filings

  • Intrastat / EU movement reports where required

  • Deregistrations once you change your logistics.

• Receive, translate and sort tax office letters via the Tax Letter Inbox.

• Provide a central compliance dashboard so you always know what has been filed and what is due.

---

Thinking About Backdated VAT Registration and Returns?

If you suspect that:

• You stored goods in another EU country without registering, or

• You exceeded the OSS threshold and did not adjust your VAT setup,

then it’s very likely that backdated VAT registration and returns will be part of the solution.

hellotax can help you:

• Understand what went wrong,

• Quantify the risk,

• Design a clean-up plan (including backdated registrations and returns), and

• Set up a simpler, more future-proof structure going forward.

👉 Next step: book a free consultation with hellotax and let a VAT expert review your Amazon setup, OSS position and any need for backdated VAT registration and returns.

You’ll leave the call with a clear action plan – whether you are dealing with Italy, France, Spain, Poland or several countries at the same time.