Your Friendly Guide to EU VAT Compliance for Cross-Border Sellers
You might be surprised to learn that even a single sale into another EU country can trigger a VAT registration obligation, which is exactly where an EU VAT compliance guide for cross-border sellers becomes your best friend. This guide walks you through thresholds, registration steps, and reporting rules in plain language, so you can focus on growing your business instead of drowning in paperwork. It also shows you how to use tools like the One Stop Shop to simplify filings and avoid costly penalties.
Why Cross-Border Sellers Can’t Ignore EU VAT Rules
If you sell across EU borders, ignoring VAT rules isn’t an option. Once your goods land in a customer’s country, EU VAT compliance kicks in, and marketplaces like Amazon or Etsy may even collect it for you — but only if your settings are right. Get it wrong, and you could face back taxes, penalties, or a frozen seller account. A solid EU VAT compliance guide for cross-border sellers walks you through registration thresholds, OSS filing, and invoice requirements in plain steps. The moment your sales cross a country’s threshold, you must register there. Skip this, and your business pays the price later.
How the Single Market Changed Tax Obligations for Online Retailers
The Single Market turned distance selling into a single, unified marketplace, and with it came destination-based VAT obligations. Once your cross-border sales exceed the €10,000 EU-wide threshold, you must charge VAT at the customer’s local rate, not your home country’s. That means registering for One Stop Shop (OSS) and remitting tax per member state.
What changed most for online retailers? Before, you could apply your domestic VAT to all EU sales. Now, each order triggers the tax rules of the buyer’s country, making per-sale VAT determination mandatory.
Common Misconceptions About Selling Into Europe
Many cross-border sellers assume that selling into Europe triggers VAT registration only after exceeding a single EU-wide threshold. In reality, each member state applies its own distance-selling threshold, and some require immediate registration. Another common misconception about selling into Europe is that holding goods in a local warehouse exempts a seller from foreign VAT—it does the opposite, creating a fixed establishment. Sellers also wrongly believe that marketplace platforms handle every VAT obligation; while platforms may collect and remit VAT on certain B2C sales, the underlying seller remains liable for accurate reporting and records. Finally, assuming that low-value consignments escape VAT ignores the abolition of the €22 import exemption.
Penalties, Back Taxes, and Account Suspensions: Real Risks Sellers Face
Miss a VAT registration and you’re not just looking at a slap on the wrist. Penalties, back taxes, and account suspensions hit fast: overdue filings pile up interest and fines, sometimes hundreds of euros per period, and tax authorities can demand years of unpaid VAT at once. What really stings is that marketplaces like Amazon or eBay may freeze your seller account until you prove compliance, leaving your inventory stranded and your cash flow frozen. You could also lose the ability to sell into specific countries altogether. So yeah, staying on top of EU VAT isn’t busywork, it’s your safety net against sudden, expensive shutdowns.
Understanding Where Your VAT Liability Begins
Your VAT liability begins the moment you sell goods to a customer in an EU country, not when you register or file a return. For cross-border sellers, this means tracking each sale’s destination and value against local thresholds from day one. Know your starting point before you ship. Where exactly does liability trigger? It starts with the first taxable supply in a country, whether from a warehouse or direct dispatch. Ignoring this leads to back taxes and penalties. Build your compliance guide around that first sale, because every subsequent filing depends on correctly identifying when and where your obligation truly began.
Distance Selling Thresholds and When They Stop Applying
Distance selling thresholds determine when cross-border B2C sales shift VAT liability from your home country to the customer’s member state. These thresholds apply per country and typically range from €35,000 to €100,000. Once you exceed a specific country’s threshold, you must register and charge local VAT there. The distance selling threshold stops applying at the moment your cumulative sales into that country surpass the limit within the current or previous calendar year. After that point, you cannot rely on the threshold again unless your sales fall below it for a full year and you deregister. The sequence is:
- Monitor cumulative sales per EU country.
- Identify when a threshold is crossed.
- Register for VAT in that country.
- Charge and remit VAT at local rates.
- Stop using the threshold for future sales there.
Marketplace Facilitator Rules and Who Collects the Tax
When selling through an online marketplace, the platform often becomes the deemed supplier and assumes the VAT collection obligation under the Marketplace Facilitator Rules. This means the marketplace, not you, invoices the customer and remits VAT on B2C sales below the €10,000 threshold or when it facilitates the transaction. You remain responsible for VAT on your own direct sales and must reconcile marketplace reports with your returns. Q: Who collects the VAT when a marketplace facilitates my sale? A: The marketplace collects and remits VAT, but you must still report those transactions correctly in your EU VAT return.
Domestic vs. Cross-Border Transactions: Spotting the Difference
Where your customer is located determines which VAT rules apply. A domestic transaction occurs when goods move within one EU member state, requiring you to charge local VAT at the applicable rate. A cross-border transaction involves shipping to another EU country, often triggering destination-based VAT or reverse-charge mechanisms depending on the buyer’s status and the goods’ value. Spotting the difference means checking your customer’s location, the shipping destination, and whether they are a business or consumer. Misclassifying a cross-border sale as domestic leads to incorrect VAT charges, sudden liabilities, and compliance headaches. Always verify the destination before invoicing.
Domestic sales follow local VAT; cross-border sales shift liability to the destination country. Confirm where your customer is before you charge.
Registering for VAT in Multiple Member States
If you sell into several EU countries, you may need to register for VAT in each one where you hold stock or exceed the local distance-selling threshold. Here’s the key question: “Do I register everywhere at once?” Not always—start with countries where you store inventory or pass the sales limit. You can often use the One Stop Shop (OSS) to report cross-border B2C sales under one registration, but local stock still requires a local VAT number. Keep each registration separate, file returns on that country’s schedule, and track your VAT IDs carefully to avoid gaps or double reporting.
When Local Registration Becomes Mandatory
So, when does local VAT registration become mandatory? Basically, you need to register for VAT in a country once you hold stock there, even if it’s just in a fulfilment centre like Amazon FBA. Same goes if you exceed the distant sales threshold for that specific country, or if you’re selling goods already located within that member state at the point of sale. Here’s the usual trigger sequence: you store inventory locally, you pass the annual cross-border sales limit, or you make a sale from a domestic warehouse. Once any of those happen, you can’t rely on your home country registration anymore.
Voluntary Registration: Pros, Cons, and Practical Triggers
Thinking about voluntary VAT registration before you have to? It can be a smart move. The upside: you reclaim input VAT on purchases, look more legit to B2B buyers, and avoid a nasty surprise when you cross the distance-selling threshold. The downside: monthly filings, bookkeeping costs, and cash flow headaches from VAT you collected but haven’t paid yet. So when does it make sense? If you’re selling mainly to other businesses, storing inventory in a country, or rapidly approaching that €10,000 EU-wide threshold. Otherwise, wait. Honestly, run the numbers first—voluntary registration is a tool, not a trophy.
Using Fiscal Representatives and Their Role in Compliance
When you appoint a fiscal representative for EU VAT, that entity becomes legally liable for your VAT filings, payments, and record-keeping in the relevant member state. They handle registrations, submit returns, and respond to tax authority queries on your behalf. Not every member state requires a fiscal representative, but when it does, you remain ultimately responsible for accuracy. Your representative acts as the local compliance contact, ensuring deadlines and documentation meet national rules. Choose one with direct experience in your sales model and clear communication channels. Their role is practical: shield you from procedural errors while keeping your cross-border sales compliant.
- Verify whether the member state mandates a fiscal representative for non-EU sellers.
- Confirm the representative handles registrations, filings, and payments locally.
- Ensure they maintain audit-ready records and respond to authority notices.
- Clarify liability and communication workflows before signing any agreement.
The One-Stop Shop Explained Without the Jargon
Think of the One-Stop Shop as a single electronic portal where you file one VAT return for all your cross-border B2C sales across the EU. No more juggling separate country registrations. How does it work? You register in your home country, charge destination VAT rates at checkout, and submit one quarterly return covering every member state. The portal then distributes each country’s share of tax automatically. For sellers, this means one deadline, one currency conversion, and one payment instead of dozens. It turns a bureaucratic maze into a straightforward monthly routine, letting you focus on growing sales rather than chasing tax offices.
Union Scheme vs. Non-Union Scheme: Picking the Right One
So, how do you know which scheme fits your business? The Union Scheme vs. Non-Union Scheme choice basically comes down to where your company is based. If your business is established inside the EU, you’ll use the Union Scheme. If you’re based outside the EU, you’ll typically use the Non-Union Scheme. Here’s the quick version:
- EU-established seller? Go with the Union Scheme.
- Non-EU-established seller? The Non-Union Scheme is your match.
- Not sure? Check where your business is registered, not where you ship from.
Pick the wrong one and your returns get messy, so match your scheme to your establishment status before you file.
Import One-Stop Shop for Low-Value Goods
The Import One-Stop Shop for Low-Value Goods lets cross-border sellers declare VAT on consignments not exceeding €150 through a single monthly return, replacing separate registrations in each destination country. You charge VAT at checkout using the buyer’s local rate, then file one IOSS return covering all EU sales. Goods move faster through customs because the IOSS number is transmitted electronically, avoiding import VAT collection at delivery. If you sell via an online marketplace, it may handle IOSS for you; otherwise, you must register directly or appoint an intermediary. Keep records of eligible sales and confirm your IOSS number appears on invoices and shipping data.
Filing Quarterly Returns Through a Single Portal
Instead of logging into five different tax authorities, you file every quarterly return through one single portal for EU VAT filing. You upload sales data once, review pre-filled totals, and submit. The portal then routes each return to the correct country. Quarterly deadlines stay visible in one calendar. If you sell into three countries, you file three returns but from one dashboard. Corrections and payment confirmations appear in the same place. This cuts admin time and missed filings.
What if one country rejects my quarterly return? The portal flags the error, shows the rejected line, and lets you resubmit without starting over or contacting each tax office separately.
VAT Rates, Invoicing, and Record-Keeping Essentials
Cross-border sellers must apply the destination country’s VAT rate to every B2C sale, so maintaining a current rate table for all EU member states is non-negotiable. Your invoices must include your VAT identification number, the customer’s location, the applicable rate, and the VAT amount in the buyer’s currency. Record-keeping is your legal safety net: retain invoices, proof of dispatch, and payment records for at least six to ten years, depending on the jurisdiction. Critically, a valid invoice for one country may be non-compliant in another due to mandatory wording or format differences. Digital archiving with audit-ready timestamps ensures you can defend every cross-border transaction.
Navigating Reduced, Standard, and Zero Rates Across Countries
Cross-border sellers must assign the correct VAT rate to every product, because the same item can be standard-rated in one member state, reduced-rated in another, and zero-rated elsewhere. To navigate this, first classify each good using the destination country’s combined nomenclature, then verify whether that country applies a reduced rate to your category, and finally confirm zero-rate eligibility for exports or intra-community supplies. Navigating reduced, standard, and zero rates across countries demands storing rate evidence per transaction. Always apply the rate of the country where the customer receives the goods, not where your business is registered.
- Identify the product category under the destination’s tariff.
- Check the local reduced-rate schedule for that category.
- Apply zero rate only when the supply qualifies as an export or exempt intra-EU dispatch.
What a Compliant Cross-Border Invoice Must Include
A compliant cross-border invoice needs a few key things to keep everyone happy. Always include your full business name, address, and VAT number, plus your customer’s details and their VAT ID for B2B sales. Add a unique invoice number and the issue date. List each item with quantity, unit price, and the VAT rate applied. If you’re using the reverse charge, note “VAT exempt” or “reverse charge” clearly. For cross-border B2C sales, show the VAT rate of the customer’s country. Finally, include the total excluding VAT, the VAT amount, and the grand total.
How Long to Store Records and in What Format
Under EU VAT rules, cross-border sellers must retain invoices and supporting records for six to ten years, depending on the member state where the transaction is recorded. Most jurisdictions mandate six years, but countries such as Germany and Austria may extend this to ten. Acceptable formats include original paper invoices, scanned PDFs, and structured electronic files, provided they remain legible, unaltered, and accessible. Digital archiving systems must preserve audit trails and allow export in a readable format upon request. Storing records solely in a non-searchable image file risks non-compliance. Consistent, backdated archiving across all applicable jurisdictions prevents penalties during audits.
Store VAT records for six to ten years, matching each member state’s deadline, in legible paper or secure, unaltered digital formats that remain accessible for audit.
Handling Returns, Refunds, and Bad Debts
When a cross-border customer returns goods, you must adjust the original VAT declared in the dispatch country, typically by issuing a credit note that reduces your taxable amount. For refunds without returns, the same correction applies, but if you refund via a payment processor without a linked credit note, your VAT records will not match. Handling Returns, Refunds, and Bad Debts requires tracking each transaction’s VAT treatment per EU member state.
Bad debts are not automatically deductible for VAT; you can only reclaim VAT on unpaid invoices if you meet specific national conditions, such as proving the debt is irrecoverable.
Always reconcile credit notes and bad debt claims against your periodic VAT returns.
Correcting Errors on Previously Filed Returns
When you discover a mistake on a submitted EU VAT return, act fast and correct it properly. Most errors can be fixed through an amended VAT return in the country where the original was filed, while minor adjustments are often allowed on your next return under local thresholds. Gather the original filing, invoice evidence, and a clear calculation of the difference before submitting. If you used a fiscal representative or One Stop Shop, check whether the correction goes through that channel. Never ignore an error, because voluntary disclosure usually reduces penalties and interest.
Q: Can I correct an error from a previous EU VAT return? A: Yes, typically by filing an amendment or adjustment in the same country, ideally before the tax authority contacts you.
Adjusting VAT When Customers Send Items Back
When a customer returns goods, you must correct the VAT originally charged. Issue a credit note that references the original invoice, then reduce your output VAT for that period. For cross-border sales, use the VAT adjustment on returned goods to reclaim tax under the destination country’s rules. If you already filed the return, amend it via your next VAT return or a specific correction mechanism. Keep records of the return and credit note for audits. Timing matters: adjust in the period the return is accepted, not when the refund is paid. Q: Can I simply refund without adjusting VAT? No—without a proper credit note, you risk overpaying VAT and failing compliance.
Recovering Overpaid Tax Through Refund Claims
When you overpay VAT in another EU member state, recovering that cash requires a **refund claim under the EU VAT Refund Directive** rather than a standard return adjustment. You must file electronically through the portal of your own member state, typically by 30 September of the following calendar year. Attach invoices and proof of import VAT payment, since missing evidence triggers automatic rejection. Claims below the local threshold may be carried forward, so track deadlines carefully. A dedicated table comparing claim types can clarify eligibility.
Amazon, eBay, Etsy, and Other Platform Obligations
When Anna sold handmade candles across the EU, she assumed Amazon, eBay, and Etsy handled everything. Platform obligations for EU VAT compliance proved trickier. Amazon may deem itself the deemed supplier on certain B2C sales, charging and remitting VAT, yet sellers still need valid VAT IDs for FBA inventory. eBay often leaves VAT collection to you unless using its managed payments. Etsy collects VAT on digital items and some physical goods to EU buyers, but not all.
Never assume the marketplace files your returns; always confirm who is the deemed supplier per transaction.
Other platforms vary. Keep your own records, reconcile reports, and verify each sale’s VAT treatment.
Deemed Supplier Rules and What They Mean for Your Books
When a platform like Amazon or Etsy becomes the deemed supplier, they’re treated as the seller for VAT purposes on your behalf. That means for most B2C sales within the EU, the platform calculates, collects, and remits the VAT directly—so you don’t report those transactions on your own VAT return. Your books should reflect this shift: record the platform payout as your net revenue, not the gross sale, because VAT never touches your account. Keep platform statements separate from your own invoices, and double-check that you’re not accidentally double-reporting VAT the platform already handled.
Downloading Transaction Reports That Satisfy Tax Authorities
To satisfy EU tax authorities, you must download transaction reports that satisfy tax authorities directly from each platform’s seller dashboard. Start by selecting the correct reporting period and your home Member State’s VAT rate. Then export the raw CSV or PDF, ensuring it shows gross amounts, buyer location, and VAT collected. Always verify that the report identifies the correct VAT treatment per destination country, not just a single blended rate.
- Log into Amazon, eBay, or Etsy seller central.
- Navigate to tax documents or transaction reports.
- Choose the date range matching your VAT return.
- Download the file and confirm it includes buyer country and tax amount.
- Archive the report unaltered for audit purposes.
Reconciling Platform-Collected VAT With Your Own Filings
Okay, so when a platform like Amazon or Etsy collects VAT on your behalf, that money never hits your bank account—but you still have to reconcile platform-collected VAT with your own filings. Grab your monthly platform VAT reports and match them against your sales records. Check the country, rate, and transaction date for every order. If the platform collected VAT, you don’t remit it again—just report it as a separate line. Any mismatch? Flag it before submitting. Keep a simple spreadsheet tracking collected versus filed amounts per country. That way, you avoid double-paying or scary letters from tax authorities.
Import Duties, Customs, and VAT at the Border
When your goods cross the EU border, import duties, customs clearance, and import VAT are triggered unless you intervene correctly. Import VAT is typically paid by the importer of record, not automatically by you as the seller, so clarify this in your shipping terms. To avoid double taxation, use customs procedures like postponement or deferred payment. Registering for VAT in the destination country may let you reclaim import VAT on your returns. Note that customs authorities treat the declared transaction value as the basis for both duty and VAT, even if your commercial invoice shows a lower price. Always provide a compliant commercial invoice and correct commodity codes to prevent delays.
How Customs Declarations Interact With VAT Reporting
Customs declarations directly feed VAT reporting because the declared customs value, import VAT amount, and commodity code determine what you must reconcile in your periodic VAT return. When goods enter the EU, the import VAT paid or deferred under postponed VAT accounting must be matched against the corresponding customs entry, ensuring the taxable base aligns with the declared transaction value. Accurate customs declarations prevent mismatches between import VAT and reported output or input VAT. In practice, a single incorrect commodity code or undervalued declaration can trigger a VAT assessment even if the sale itself was correctly invoiced.
- Reconcile customs entry numbers with import VAT lines in your VAT return.
- Use the customs value as the VAT taxable base for the import.
- Match postponed import VAT to the same period’s acquisition or reverse-charge entries.
- Retain customs declarations as audit evidence for cross-border VAT filings.
Duty Relief Programs and Special Procedures for E-Commerce
For low-value consignments, the Import One-Stop Shop (IOSS) simplifies VAT but does not automatically eliminate customs duties. Sellers can still benefit from duty relief programs such as the EU’s €150 duty exemption threshold for most goods, though this does not apply to excise products. Special procedures for e-commerce include:
- Using IOSS to declare and pay VAT on distance sales of imported goods valued at or below €150.
- Applying for duty relief under the low-value consignment regime when eligible.
- Keeping accurate commercial invoices and customs declarations to substantiate relief claims.
Without these steps, sellers risk double taxation or delayed clearance at the border.
Avoiding Double Taxation on Goods Entering the EU
Picture this: you’ve already paid import VAT at the border, then your customer gets charged VAT again at checkout—that’s the double taxation nightmare. To sidestep it, use your EORI number and IOSS scheme where applicable, ensuring import VAT is declared once. Always retain customs proof of import VAT payment and reconcile it against your VAT return. When selling via marketplaces, verify who is the deemed supplier. For goods stored in EU warehouses, use fiscal representation or deferment accounts to avoid duplicate charges. Mastering these steps keeps your cash flow healthy and customers happy.
- Register for IOSS to collect and remit VAT once for consignments under €150.
- Keep customs import documents to credit import VAT against your periodic return.
- Confirm whether the marketplace or you are liable for VAT on deemed supply.
- Apply for VAT deferment or fiscal representation for stored goods to prevent double charging.
Technology and Tools That Simplify Compliance
Honestly, the right software makes EU VAT feel way less scary. Technology and tools that simplify compliance for cross-border sellers include platforms like TaxJar, Avalara, and Quaderno that automatically calculate VAT rates at checkout based on your customer’s location. These tools also store valid VAT IDs, apply reverse charge rules, and generate OSS-ready reports. A key insight?
You don’t need to memorize every EU threshold—your dashboard will flag when you cross one.
Many tools even sync with Shopify or Amazon, pulling transaction data so you never miss a filing. Just pick one that supports the One Stop Shop scheme, and let it handle the math while you focus on selling.
Choosing VAT Software That Connects to Your Storefront
Choose a VAT tool that plugs directly into your storefront, because manual exports invite errors and delays. Storefront-connected VAT software pulls order data automatically, applies the correct EU destination rates, and flags missing VAT IDs before checkout completes. Confirm the integration supports your platform, syncs refunds and returns, and updates rates without downtime. Test the connection with a live transaction before committing.
- Verify native plugins for your exact ecommerce platform
- Check real-time rate updates and VAT ID validation at checkout
- Confirm automatic syncing of refunds, returns, and credit notes
- Test the connection with a live order before full rollout
Automating Rate Lookups and Invoice Generation
Automating rate lookups connects your checkout or billing system to a VAT rate database that returns the correct percentage based on the customer’s country, product type, and applicable reduced rates. The same automation then generates compliant invoices containing mandatory fields such as VAT numbers, tax breakdowns, and reverse-charge notes. Automating rate lookups and invoice generation reduces manual errors, ensures consistent formatting across currencies, and stores sequential invoice numbers for audit trails. Integration usually works via API calls or pre-built connectors for platforms like Shopify, WooCommerce, or ERP systems.
- Real-time VAT rate retrieval by customer location and product category
- Automatic invoice creation with required EU VAT identifiers and tax sums
- Sequential numbering and secure archiving for audit readiness
- API or plugin integration with existing sales and accounting tools
Audit Trails: What Tax Authorities Expect From Digital Records
Tax authorities expect digital records to preserve a complete, unbroken audit trail for EU VAT compliance from transaction to filing. Each sale must link to an invoice, VAT rate applied, and the buyer’s location evidence. Credit notes, refunds, and corrections must reference the original entry rather than overwrite it. Records should show who changed what, when, and why. Timestamps must be consistent and verifiable. Data must remain readable and exportable in a standard format for inspection. Sellers should store records for the legally required period and ensure no gaps exist between order, payment, and reporting systems.
An audit trail is a verifiable, chronological record linking every transaction to its invoice, VAT treatment, and filing, with no missing or overwritten entries.
Staying Compliant as Rules Evolve
Last spring, Marta’s small ceramic shop sold a vase to a customer in France, then a mug to someone in Italy. She thought her old VAT setup was fine—until the EU’s 2025 import rules shifted the threshold for distance sales. Staying compliant as rules evolve means checking your One-Stop-Shop (OSS) portal monthly, not yearly. How do you keep up? Set a calendar reminder to review the European Commission’s VAT e-learning corner every quarter, and update your checkout’s tax logic whenever your home country’s rate or the €10,000 cross-border threshold changes. That way, Marta avoids surprise back-taxes and keeps selling without panic.
Monitoring Changes From the European Commission and ECJ Rulings
To keep cross-border VAT positions defensible, sellers should track two distinct streams: European Commission implementing measures that alter place-of-supply or reporting mechanics, and ECJ rulings that reinterpret existing directives retroactively. Monitoring changes from the European Commission and ECJ rulings means setting alerts onCommission https://stafir.com/ VAT Committee guidelines and CURIA case notifications, then mapping each update to your transaction flows. Assess whether a judgment affects past periods, requiring amended returns, or only prospective invoicing. Document the date you identified each change and the internal action taken. This creates an audit trail showing you actively monitored judicial and administrative developments rather than reacting after penalties arise.
Effective VAT compliance depends on systematically tracking Commission measures and ECJ judgments, then translating each into concrete adjustments to returns, invoices, and internal controls.
Working With Local Tax Advisors Without Breaking the Bank
To control costs when working with local tax advisors, start by defining a narrow scope: ask them to review only your registration thresholds, filing cadence, or a specific cross-border transaction rather than your entire bookkeeping. Request fixed-fee quotes for one-off compliance checks instead of open-ended retainers, and batch your questions monthly to reduce billable hours. Use shared documents with pre-filled sales data so advisors spend time on analysis, not data entry. For routine filings, consider a regional advisor covering multiple member states, which often costs less than separate country specialists.
Q: How can I keep local tax advisor costs low while staying compliant?
A: Limit their work to high-risk areas, demand fixed fees, and handle data preparation yourself.
Building a Quarterly Compliance Calendar for Your Business
Build a quarterly compliance calendar to keep cross-border VAT obligations visible and actionable. Start by mapping every recurring deadline, from returns and EC Sales Lists to OSS filings, then assign each task a fixed week within the quarter. Building a quarterly compliance calendar for your business turns scattered deadlines into one predictable rhythm, so nothing slips when rules shift. Reviewing your calendar at the start of each quarter lets you adjust filings before small changes become costly penalties. Build in buffer time for data collection and payment approval, and archive confirmations after submission.
- List all VAT deadlines by country and filing type
- Assign owners and reminder dates for each task
- Schedule quarterly reviews to update obligations
- Archive submission receipts for audit readiness
