Outsource Bookkeeping UK: Costs, Process, and Control

UK VAT registration for US businesses can be required much earlier than many owners expect, especially if you hold stock in the UK or sell directly to UK customers.

If you are a US company, start with one question: are you making “taxable supplies” in the UK? If yes, HMRC may expect you to register, charge UK VAT, and file VAT returns.

Can you wait for the £90,000 threshold?

UK-established businesses usually register when taxable turnover exceeds £90,000 in any rolling 12-month period (or if they expect to exceed it in the next 30 days).
But overseas businesses can be treated differently. If you’re a non-established taxable person (NETP), the normal threshold does not apply, and you may need to register from your first taxable sale in the UK.

A quick rule of thumb:

UK established: the £90,000 test is often relevant.
Not UK established: check whether you are an NETP and whether you have made any taxable supplies.

What is a “taxable supply” for a US business?

A taxable supply is a sale that is within the scope of UK VAT (standard, reduced, or zero-rated). Exempt supplies are different and do not behave the same way for VAT registration decisions.

Common trigger scenarios:

You sell goods to UK customers and the goods are in the UK at the time of sale (for example, stored in a UK warehouse).
You import goods into Great Britain and then sell them locally.
You provide services where the “place of supply” is treated as the UK (depends on the service and whether the customer is a business or a consumer).

Selling goods from the US to UK customers: the £135 consignment rule

If the goods are outside the UK at the point of sale, there are special rules for low-value consignments.

For consignments with an intrinsic value of £135 or less, UK guidance says UK VAT is charged at the point of sale when you sell directly to customers in Great Britain. In practice, that often means you need to be VAT-registered so you can charge VAT correctly and report it on your VAT return.

There is also an important B2B exception: for a business customer that is UK VAT-registered, you generally do not charge VAT if the customer provides a valid UK VAT number, and the customer accounts for VAT under a reverse charge mechanism.

Once a consignment goes over £135, “normal” import VAT and customs rules apply again, and the VAT mechanics can change depending on who imports and how the shipment is declared.

Goods: UK stock is the usual “gotcha”

If your products are physically in the UK before you sell them, VAT registration risk rises fast. This includes 3PL warehouses and fulfilment centres. UK guidance is explicit that if you own goods located in the UK at the point of sale, you must register and account for VAT on sales you make in Great Britain or Northern Ireland.

Also check who is the “importer of record.” If you import goods into Great Britain, you will usually need a GB EORI number to clear customs.

Services: don’t assume you must charge UK VAT

For services, VAT depends heavily on customer type and service rules:

B2B: the place of supply is often where the customer belongs (reverse charge may apply).
B2C: the place of supply is often where the supplier belongs, with exceptions.

So a US company selling services to a UK business may not charge UK VAT the same way as a local seller, but you still need to classify the service before deciding.

Imports and EORI: get the customs basics right

If you import goods into England, Wales, or Scotland, government guidance says you need an Economic Operators Registration and Identification number starting with GB.

Practical checklist:

Confirm whether you need a GB EORI.
Decide who will act as importer of record.
Align incoterms, invoices, and customs entries with the VAT treatment you expect.

How to register for UK VAT as a US business

Most businesses can register online.
Overseas applications can attract extra checks, so prepare evidence.

You generally need:

Business legal details (entity name, address, registration number)
Details of the responsible person
Evidence of UK trade or intention to trade (contracts, invoices, shipping records, platform reports)
Expected taxable sales and the date you first made (or will make) taxable supplies in the UK

After approval, HMRC issues:

a UK VAT number, and
an “effective date of registration” (the date from which you must account for VAT).

Picking the “effective date”: don’t guess

For UK-established businesses, the effective date often ties to when you exceeded the threshold (or expected to exceed it).
For NETPs, it can be tied to the date you first made taxable supplies in the UK.

If HMRC later decides you should have registered earlier, you may owe backdated VAT, interest, and penalties.

What changes after you register?

VAT registration changes operations. You will usually need to:

Charge the correct VAT rate on UK taxable sales.
Keep a clear VAT audit trail (invoices, import documents, evidence of where stock was).
File VAT returns on time and pay any net VAT due.
Apply input VAT recovery rules correctly.

Many overseas sellers use outsourced bookkeeping services to keep records consistent month to month, especially with refunds, multiple channels, and stock movements.

Once you’re VAT-registered, the hard part is staying consistent month to month: clean reconciliations, correct VAT treatment per channel, and a clear audit trail for HMRC. If you want predictable reporting without hiring in-house, it can help to work with an outsourced bookkeeping company that can run the bookkeeping routine, keep records VAT-ready, and flag issues early (like stock-in-UK triggers, missing import entries, or mismatched invoice data).

Common mistakes (and simple controls)

Typical mistakes:

Assuming the £90,000 threshold protects you (it may not as an NETP).
Ignoring stock location (UK stock can create UK taxable supplies).
Mis-aligning importer of record and paperwork.
Weak evidence for HMRC checks.

Simple controls:

Reconcile sales platforms to bank receipts monthly.
Store import entries and VAT invoices together.
Document the VAT logic per channel (direct site, marketplace, wholesale).

A fast decision flow

1. Are you selling goods that are in the UK at the time of sale?

If yes, treat VAT registration as urgent.

2. Are you selling goods from abroad in consignments £135 or less to UK consumers?

If yes, plan for VAT at the point of sale.

3. Are you importing goods into Great Britain?

If yes, fix EORI/customs first, then confirm VAT

4. Are you selling services?

If yes, classify the service and customer type (B2B vs B2C).

5. Are you UK established?

If no, test NETP status and the “first taxable supply” trigger.

Summary

VAT registration is manageable when you treat it as a workflow: tax logic, customs, invoicing, and records lining up. If you’re already trading in the UK, confirm your trigger point first, then register with the right effective date, then build a repeatable process for returns and evidence.