Quick answer
You must register for Jersey GST once taxable turnover exceeds £300,000 in any rolling 12-month period.
Below £300,000 registration is voluntary. Not sure where you stand? Our bookkeeping team tracks your turnover and handles registration.
The short answer
You must register for GST once your taxable turnover exceeds £300,000 in any rolling 12-month period. Below that, registration is voluntary: a choice, not an obligation. Miss the compulsory line and you may owe back-dated GST you cannot recover from customers.
Jersey deliberately set its GST registration threshold high so that genuinely small businesses are not dragged into quarterly tax administration. That is good news for sole traders and micro-enterprises. It also means many owners stop thinking about GST altogether, right up until a busy year quietly pushes them over the line.
Three questions settle it. Do you have to register, do you have a choice, and what does it cost if you get the timing wrong? Only one figure here is hard, the £300,000 threshold. For everything that can change, go to Revenue Jersey at gov.je.
The £300,000 Threshold
Registration is compulsory once your taxable turnover exceeds £300,000 in any rolling 12-month period. "Taxable turnover" means the value of the goods and services you supply that fall within the scope of GST, including standard-rated and zero-rated supplies, but generally excluding genuinely exempt supplies and items outside the scope of the tax.
Compulsory Registration Line
£300,000
Taxable turnover over any rolling 12 months. Cross it and registration with Revenue Jersey is no longer optional.
The threshold is not the same as your profit, your bank balance, or your net income. It is turnover: the top line. A business can be barely breaking even on paper and still be obliged to register because its sales have crossed £300,000. Confuse turnover with profit and you may register far too late.
Why It Is a Rolling Test, Not an Annual One
The phrase that trips people up is "rolling 12-month period". This does not mean your calendar year or your accounting year. It means you must check, at the end of each month, whether your taxable turnover over the previous twelve months has crossed £300,000. You also look ahead to whether you reasonably expect to cross it in the next thirty days.
Two questions to ask every month:
Looking back, have my taxable supplies over the last 12 months exceeded £300,000? Looking forward, am I about to in the next 30 days, perhaps because of a large order just won? A "yes" to either triggers the obligation to register.
Because the window keeps moving, a seasonal spike or a single major contract can tip a business over the line in a month you were not watching. The defence is simple: keep your bookkeeping current so your rolling 12-month turnover is always visible at a glance, rather than something you reconstruct at year end.
Voluntary Registration Below the Threshold
If your turnover sits comfortably below £300,000, you can still choose to register voluntarily. For some businesses this is a smart move; for others it adds administration for little benefit. The right answer depends almost entirely on who your customers are and how much GST you incur on your own purchases.
Voluntary registration tends to suit businesses that:
- Sell mainly to other GST-registered businesses who can reclaim the GST you charge
- Incur significant GST on stock, equipment or services and want to recover that input tax
- Want the credibility of being GST-registered when bidding for larger contracts
- Expect to cross the threshold soon and would rather register early on their own terms
By contrast, if you sell mostly to private consumers who cannot reclaim GST, voluntary registration simply makes you 5% more expensive than an unregistered competitor, or forces you to absorb the tax yourself. In that case staying unregistered is often the better commercial call.
Should You Register? A Five-Step Check
Work through these in order and stop at the first one that decides it for you. It turns a vague worry into a five-minute answer.
- 1
Add up your taxable turnover for the last 12 months (rolling, not your accounting year).
Over £300,000? You must register now. Stop here; the rest is moot.
- 2
Have you just won, or do you expect, a contract that tips you over £300,000 in the next 30 days?
The forward-look test bites on the expectation, not the payment. If yes, register now.
- 3
Still below £300,000. Are most of your customers themselves GST-registered businesses?
They reclaim the GST you charge, so registering is broadly neutral to them and lets you reclaim your own input tax.
- 4
Do you pay a lot of GST on stock, equipment or imports?
Voluntary registration lets you recover that input tax, often the deciding factor for import-heavy trades.
- 5
Do you sell mainly to private consumers who cannot reclaim GST?
Then registering makes you 5% dearer or eats your margin. Staying unregistered is usually the better commercial call.
A framework, not advice for your business — and the only hard line, £300,000, should always be confirmed with Revenue Jersey at gov.je.
Pros and Cons Weighed Side by Side
For a business genuinely free to choose, it helps to set the trade-offs out plainly rather than relying on instinct.
| Consideration | Register voluntarily | Stay unregistered |
|---|---|---|
| Reclaim input tax | Yes | No |
| Admin burden | Quarterly returns | None |
| Pricing to consumers | 5% dearer or absorbed | No GST added |
| Pricing to businesses | Neutral (they reclaim) | No GST shown |
| Perceived scale | Looks established | Looks smaller |
This is a general framework, not advice for your specific business. Your supplier base, customer mix and growth plans all change the answer.
The Cost of Late Registration
Missing the compulsory threshold is the expensive mistake. Once you are obliged to register, your liability to account for GST generally starts from the date you should have registered — not the date you eventually get around to it. That can leave you owing GST on sales you already made without charging it.
The trap with back-dated GST
If you register late, you may still owe GST on invoices you raised in the meantime. In practice you often cannot go back to customers, especially private consumers, to collect the 5% after the fact, so it comes straight out of your margin. Penalties and interest can apply on top.
The amounts and the precise rules for penalties and interest are set by Revenue Jersey and can change, so check the current position on gov.je. But the principle does not change: the cure is to monitor your rolling turnover and register on time. For the wider compliance calendar, see our Jersey tax and compliance deadlines guide.
Frequently Asked Questions
Does the £300,000 threshold count my profit or my sales?
It counts your taxable turnover, meaning the value of the supplies you make that fall within GST, not your profit. A business with high sales and thin margins can be obliged to register even if it is barely profitable. Always measure the threshold against the top line, not the bottom line.
If I register voluntarily, can I deregister later?
There are circumstances in which a voluntarily registered business can cancel its registration, typically where its turnover is and will remain below the threshold. The rules and any conditions are administered by Revenue Jersey, so confirm the current process on gov.je before deregistering, and weigh the loss of input tax recovery against the admin you would save.
What counts towards the rolling 12-month turnover?
Broadly, your standard-rated and zero-rated taxable supplies count, while genuinely exempt supplies and items outside the scope of GST generally do not. Because the classification of your particular supplies matters, confirm what is and is not included with Revenue Jersey or a bookkeeper rather than guessing.
I have just won a big contract that will push me over — when do I register?
The forward-look test matters here: if you reasonably expect to exceed £300,000 in the next 30 days, the obligation to register can be triggered immediately rather than waiting until the money lands. Act on the expectation, not just the historic figures, and check the timing rules on gov.je.
Important Disclaimer
The GST registration threshold, the rules around voluntary registration, and any penalties for late registration are set by the Government of Jersey and can change. This article is general information only and is not formal tax advice. Confirm current rules with Revenue Jersey at gov.je and seek advice tailored to your business.
From Bookkeeper.je
Not Sure Whether You Should Register?
We keep a live view of your rolling 12-month turnover so you never cross the £300,000 line unnoticed, and we will talk through whether voluntary registration makes commercial sense for your customer mix. Fixed monthly pricing, every Jersey parish covered.