EU VAT OSS Threshold Check 2026 by ReadyStack

The EUR 10,000 threshold is not yours if you sell into the EU from outside it - this works out the line that applies and the back-VAT behind you.


Click Add to Firefox on this page. Nothing to unzip, no developer mode - the free version runs right away.

• The threshold that is actually yours — Article 59c gives the EUR 10,000 EU-wide threshold only to a seller established in one member state. A UK or US seller gets EUR 0 - the tool says which one is yours before it counts anything.
• VAT carved out, not added on — Money you already took from an EU consumer is treated as VAT-inclusive, so the back-VAT is sales x rate / (100 + rate), not sales x rate. That single difference is about 17% of the bill at 21%.
• The month you cross, at your run rate — Takes your year-to-date EU B2C sales and your monthly run rate and names the month the EUR 10,000 line is crossed, so registration happens before the sale that breaks it, not after.
• Marketplace and registration cases — If Amazon, Etsy or the App Store is the deemed supplier, the platform accounts for the VAT and your exposure is zero. One tick tells the calculator that, instead of leaving you to guess.
• CSV of the worked result (full version) — Downloads the inputs and every figure as a .csv row you keep and hand to an accountant - the same numbers, outside the browser.
• OSS quarter alarms (full version) — Sets a browser alarm for the OSS return deadline - the last day of the month after each quarter - so the filing does not depend on remembering it.

| You type | |
|---|---|
| Where your business is established | default UK business (outside the EU) |
| What you sell to EU consumers | default Digital services (downloads, courses, software) |
| EU B2C sales so far this year | default 6200 |
| EU B2C sales per month from here | default 1800 |
| Months of the year already sold | default 8 |
| Average destination VAT rate | default 21 |
| Penalty rate your tax office adds | default 10 |
| A marketplace is the deemed supplier on these sales | default False |
| Already registered for OSS or IOSS | default False |

| It answers | |
|---|---|
| Threshold that applies to you | EUR |
| You cross it | |
| Months until you cross | months |
| Sales already past the line, untaxed | EUR |
| Back VAT, carved out of what you took | EUR |
| Penalty at your rate | EUR |
| Total exposure today | EUR |
| Counted as | |
| What to do next | |

Permissions requested: storage, downloads, alarms


Free: the calculation in the popup, no key, no limit. Full version ($60): download the result as .csv and deadline reminders - one licence key per person or team seat. Get it: https://getreadystack.com/api/buy/cl/polar_cl_CMYOeDFK0VNj2Tifzp2Hm8ULNvRMMGOyi1VV33R6VYF


When you use the tool, the extension sends one anonymous count a day (the tool’s name only — no inputs, no personal data). Turn it off on the first page after install. Firefox asks first and sends nothing unless you allow it. A licence key is checked with the payment provider (Polar) only when you enter one.