OSS and IOSS in Estonia: How One-Stop Shop VAT Works for EU E-Commerce

This material is based on guidance from the Estonian Tax and Customs Board (EMTA) regarding special e-commerce schemes, Directive 2006/112/EC (Articles 358a–369x), the Estonian Value Added Tax Act, and practical experience with online marketplaces. Always verify current rates and procedures on emta.ee prior to submitting an application.

Quick Answer: Key Takeaways in 60 Seconds

OSS and IOSS are neither taxes nor standalone obligations. They are two “One-Stop Shop” mechanisms that allow you to pay foreign VAT through the Estonian tax authority instead of registering for VAT in up to 27 different countries.

Key facts for 2026:

• OSS applies to goods that are already located within the EU at the time of sale, as well as services provided to consumers in other EU member states. IOSS applies to goods imported into the EU from third countries in consignments valued up to €150.
• €10,000 Threshold is a combined threshold across the entire EU, not per individual country. Cross-border B2C goods sales and digital services to EU consumers are calculated together. Below the threshold, you can apply the Estonian 24% VAT rate; above it, the VAT rate of the buyer’s country applies.
• The schemes are optional, but the tax is not. Opting out of OSS does not waive the obligation to pay VAT in the consumer’s country; it simply requires you to register for VAT in each destination country separately.
• Registration is done via e-MTA. An Estonian company can only register for OSS/IOSS in Estonia — based on its place of business.
• Reporting: OSS requires quarterly returns by the end of the month following the quarter (April 30, July 31, October 31, January 31). IOSS requires monthly returns by the end of the following month.
• OSS does not replace standard VAT registration or exempt you from submitting regular monthly KMD tax returns. It is an additional filing requirement, not a replacement.
• Warehousing inventory in another EU country (such as Amazon FBA) requires local VAT registration in that specific country — OSS does not resolve local inventory obligations.
• Record Keeping: Records must be retained for 10 years, compared to the standard seven years.

Below, we break down how to determine which scheme fits your business model, how to calculate the €10,000 threshold, who pays VAT when selling through marketplaces, and the most common audit mistakes.

Decision Tree: Three Questions Before Filing Your Application

Before submitting an application, answer three core questions. Their combination clearly dictates the appropriate scheme.

Question 1. Where are the goods physically located at the time of sale? Inside the EU → OSS territory. Outside the EU and shipped directly to the buyer → IOSS territory.

Question 2. Who is the buyer? A private individual or a non-VAT-registered business → schemes apply. A business with a valid VAT number → this is B2B, falling under reverse charge rules; neither OSS nor IOSS is needed.

Question 3. Do you hold inventory in other EU countries? If yes — local VAT registration in the warehouse’s host country is required in addition to OSS.

A practical takeaway rarely stated outright: for most Estonian sellers, the correct answer is not “OSS or local registration,” but rather a combination. OSS covers cross-border B2C sales, while local VAT numbers cover warehouse storage and local sales within those specific countries.

OSS: What It Is and Who Needs It

Union OSS (special scheme for EU-established businesses) applies to:

• intra-Community distance sales of goods — where goods are shipped from one EU member state to a consumer in another;
• digital services provided to EU consumers: software, subscriptions, online courses, web hosting, e-books;
• services where the place of supply is the consumer’s country: real estate-related services, cultural, sporting, educational, and entertainment events, vehicle rentals, and several other specific categories.

The logic: instead of obtaining individual VAT numbers in Germany, France, Spain, and Poland and filing four sets of tax returns, you file one single quarterly return in e-MTA, pay a single lump sum to EMTA, and the tax authority redistributes the funds to the respective member states.

The €10,000 Threshold: What Counts Toward It

This is a combined EU-wide threshold replacing the former individual national distance selling limits. The following are included:

• cross-border B2C goods sales from one EU country to consumers in others;
• digital (telecommunication, broadcasting, and electronic) services to consumers in other EU countries.

What is excluded: domestic sales to Estonian buyers, B2B transactions with VAT-registered counterparties, sales outside the EU, and—crucially—transactions where the marketplace itself acts as the deemed supplier and collects the VAT.

Below the threshold, you have a choice: apply the standard Estonian 24% VAT rate to all EU sales and declare them in your regular KMD, or voluntarily register for OSS. Above the threshold, there is no choice: VAT must be charged at the destination country’s rate, via OSS or through individual local registrations in every country.

The threshold is monitored cumulatively on a monthly basis, not at quarter-end. Checking only at the end of the quarter means you risk discovering an overshoot after weeks of issuing invoices with incorrect VAT rates.

Voluntary Registration Below the Threshold: When It Makes Sense

• You are scaling rapidly and expect to exceed €10,000 within the year — registering early avoids mid-quarter tax transitions.
• Destination VAT rates are lower than Estonia’s 24% rate — when selling B2C, applying lower local VAT rates effectively increases your profit margins.
• You prefer a single, predictable compliance routine rather than constantly monitoring threshold breaches.

IOSS: Importing Consignments Up to €150

IOSS applies to distance sales of goods imported from third countries when three conditions are met simultaneously:

1. The intrinsic value of the shipment does not exceed €150. Intrinsic value covers the goods themselves, excluding transport and insurance fees if listed separately on the invoice. For multi-item parcels, total value is assessed.
2. The goods are not subject to excise duties. Alcohol and tobacco are excluded regardless of value.
3. The goods are shipped directly from a third country to a consumer in the EU.

How it works: VAT at the buyer’s local rate is collected at the point of checkout, rather than at customs. Upon import, parcels accompanied by a valid IOSS number are exempt from import VAT charges at customs and clear efficiently. Customers avoid surprise courier fees — the exact issue that hurts conversion rates and drives returns.

Above €150, IOSS cannot be used. Standard customs procedures apply: customs clearance, duties where applicable, and import VAT calculated on customs value including duties and transport.

Splitting consignments to circumvent the €150 limit is strictly prohibited under anti-abuse rules.

Who Can Register for IOSS in Estonia

• Businesses with their place of business in Estonia — registering in Estonia exclusively;
• Non-EU companies with a permanent establishment in Estonia;
• Non-EU companies without an EU establishment — via an intermediary established in Estonia; the intermediary shares joint liability for tax obligations.

This last point is critical for dropshipping: if you own an Estonian OÜ and goods ship directly from China to the consumer, your OÜ registers directly without needing an intermediary. If your business structure differs, budget for intermediary service costs.

OSS vs. IOSS: Comparison Table

Step-by-Step Registration Guide

Step 1. Obtain a Standard Estonian VAT Number

Special schemes build upon standard VAT registration. You must secure an EE VAT number first, then register for OSS/IOSS. Review our detailed guide: VAT Registration in Estonia: Requirements & Deadlines.

Important note from e-Residency guidelines: if your company’s actual business activities are conducted outside Estonia, VAT and OSS registration should take place where management actually occurs. Formal Estonian incorporation without substance does not suffice — reinforcing the need for genuine economic presence.

Step 2. Select the Scheme and Timing

Timing is critical: applying after a quarter begins typically means the scheme activates on the first day of the subsequent quarter. Intervening sales must be declared through alternative channels. Plan registration aligned with quarterly cut-offs.

Step 3. Submit Application via e-MTA

Navigate to e-MTA: Taxes → Special e-Commerce & Services Schemes (OSS/IOSS). Applications are submitted electronically using digital authentication — ID-card, Mobile-ID, Smart-ID, or an e-Residency card. Authorized representatives can also apply on your behalf.

Upon IOSS registration, a unique IM number is issued. Never publish this number publicly or share it unverified: unauthorized shipments using your number create direct VAT liabilities for your company.

Step 4. Configure Storefront Tax Rules

This is frequently overlooked. You must collect VAT matching the consumer’s country rate, ranging from 17% in Luxembourg to 27% in Hungary, alongside reduced rates for eligible goods (e.g., books, food, children’s items).

Practical actions include:

• Enabling automated location-based tax rules in Shopify, WooCommerce, or custom platforms;
• Configuring specific product category rates for reduced-rate items;
• Determining tax-inclusive vs. tax-exclusive price displays (EU B2C typically requires tax-inclusive pricing);
• Gathering two non-conflicting pieces of evidence confirming customer location — shipping address, IP address, card issuing bank country, or billing address.

Step 5. Set Up Reporting Data Exports

OSS returns demand breakdowns by country and tax rate. Your e-commerce or marketplace software must export data with fields detailing: buyer country, customer type (B2C/B2B), applied rate, net amount, VAT collected, returns/credit notes linked to original orders, and marketplace VAT roles.

If your accountant cannot readily extract these fields, compliance issues will inevitably surface during filings.

Step 6. File Returns and Remit Tax Payments

OSS: Quarterly periods; due on the last day of the month following the quarter (April 30, July 31, October 31, January 31). IOSS: Monthly periods; due on the last day of the following month.

Payments are transferred to EMTA’s bank account using the specific reference number generated after filing. Nil returns must also be submitted when no sales occur.

Crucial detail: OSS deadlines are not extended for weekends or holidays — unlike standard domestic tax deadlines. Set calendar reminders one week in advance.

What OSS and IOSS Do Not Resolve

Misunderstanding these limitations causes many compliance strategies to fail.

Foreign EU Warehousing. Holding inventory in a German warehouse requires a German local VAT registration and reporting. This applies to Amazon FBA Pan-EU programs, 3PL logistics centers, or consignment setups. OSS covers cross-border consumer sales, but not domestic sales from foreign warehouses or intra-company stock transfers.

Standard Monthly KMD Filings. OSS serves as a supplementary filing. Monthly KMD returns (including KMD INF attachments) remain mandatory even if all revenue flows through OSS. Read our guide on taxes for Estonian companies.

Input VAT Recovery. OSS returns do not process input tax deductions. Foreign business expenses must be reclaimed via the EU 8th Directive refund procedure, while domestic Estonian input VAT is claimed on standard KMD returns.

B2B Sales. Sales to VAT-registered businesses fall under reverse-charge mechanisms and must not be declared in OSS returns. Verifying buyer VAT numbers via VIES remains mandatory.

Customs Duties. While IOSS exempts shipments from border import VAT, it does not exempt applicable customs tariffs.

Marketplaces: Determining Who Collects VAT

Marketplace sales introduce complexities regarding deemed supplier rules: the platform itself is legally treated as the seller for VAT purposes and collects tax directly.

Deemed supplier rules apply when:

• The platform facilitates distance sales of imported goods valued up to €150;
• The platform facilitates sales of goods located in the EU by a seller established outside the EU.

Practical implications for Estonian merchants:

• If the platform collects VAT, do not declare the transaction in your OSS return and exclude it from the €10,000 threshold;
• A single platform may act as deemed supplier for certain orders and not for others;
• Marketplaces interpret tax obligations differently across jurisdictions;
• Marketplace payouts do not equal gross revenue. Payouts reflect net figures after platform fees, refunds, and withheld VAT.

Best practice: export itemized transaction logs showing marketplace VAT roles per order, mapping them during accounting import rather than return preparation.

Common Mistakes to Avoid

Calculating the €10,000 threshold per country. The threshold is cumulative across the EU. Misinterpreting this leads to late compliance penalties.

Reviewing thresholds quarterly instead of monthly. Track sales cumulative month-by-month to catch threshold breaches instantly.

Treating net payout amounts as gross revenue. Payouts deduct commissions and tax; calculations must rely on gross transaction totals.

Assuming OSS eliminates local foreign VAT registrations. Holding inventory abroad strictly requires local VAT registrations.

Charging Estonian 24% VAT indiscriminately after joining OSS. OSS registration mandates applying destination country VAT rates.

Sharing your IOSS number publicly. Fraudulent parcels using your number generate direct tax liabilities.

Splitting shipments to stay under €150. Anti-abuse laws strictly forbid parcel splitting.

Failing to submit nil returns. Active OSS registrations require filings even during zero-sales quarters.

Expecting holiday extensions for deadlines. OSS deadlines do not shift for weekends or holidays; late filings incur immediate daily interest.

Retaining records for seven years instead of ten. OSS and IOSS compliance requires a ten-year document archive.

Infrastructure for Sustainable Compliance

Transitioning from initial OSS registration to routine quarterly reporting requires solid accounting infrastructure and a genuine legal presence in Estonia.

Under the Estonian Commercial Code, every entity must maintain a registered address in Estonia, alongside a licensed contact person if board management resides abroad. For OSS/IOSS users, this presence is vital: EMTA verifies management substance and can revoke scheme registrations if an entity lacks local connection. Furthermore, official state inquiries must be answered within strict statutory windows to avoid scheme deregistration.

Legal Address in Estonia is provided by eBusiness Solutions OÜ (FIU license FIU000421), an official member of the e-Residency Marketplace. We provide registered legal addresses in Tallinn commercial centers, licensed contact person services, official correspondence scanning, and regulatory deadline tracking. We assist with company formation in Estonia, commercial register updates, VAT registration, and special e-commerce scheme onboarding.

For e-commerce operations, this guarantees valid management substance, prevents missed tax notices, and aligns tax architecture with actual inventory routes. Explore our service packages at legaladdressinestonia.com and review our full suite of corporate services in Estonia.

Three Practical Scenarios

Scenario 1. Digital Product Storefront. Selling online courses and subscriptions to B2C clients across eight EU states with €90,000 annual revenue. No physical stock or imports involved. Solution: Standard Estonian VAT registration combined with Union OSS. IOSS is unnecessary. Focus on automating customer location verification rules.

Scenario 2. Asian Dropshipping Model. Products ship directly from China to EU consumers with a €35 average order value. Solution: IOSS registration, monthly reporting, collecting destination VAT at checkout. Verify marketplace deemed supplier roles for platform sales, and handle items over €150 via standard customs procedures.

Scenario 3. Physical Inventory with EU Warehousing. Goods stored in a Polish 3PL facility sold to customers in Poland, Germany, and Czechia. Solution: A hybrid approach using a Polish local VAT number (for inventory storage and domestic Polish sales) alongside an Estonian OSS registration for cross-border consumer deliveries from Poland to other EU states.

Core takeaway: Logistics geography, not company turnover, determines your tax architecture. A €60,000 store utilizing multi-country fulfillment involves greater complexity than a €500,000 business shipping from a single hub.

Upcoming Regulatory Changes

The EU’s “VAT in the Digital Age” (ViDA) package plans further expansion of single VAT registrations, extending OSS to cover intra-EU stock movements and modifying platform requirements. Key provisions target full implementation around 2028, with initial measures rolling out earlier.

For Estonian merchants, the trajectory is clear: local foreign registrations will decrease over time, while data accuracy requirements will rise. Businesses maintaining clean transaction tagging across location, customer type, and marketplace roles will adapt seamlessly to future updates.

Disclaimer: This article is provided for informational purposes only and does not constitute legal, tax, or accounting advice. Tax thresholds, EU VAT rates, marketplace terms, and ViDA reform schedules are subject to change. Always consult official EMTA guidance on emta.ee or speak with qualified specialists before registering for special tax schemes.