UK Accounting · Startups
Startup accounting, set up the right way
Startup accounting is about getting the foundations right from day one: choosing between sole trader and limited company, registering correctly with Companies House and HMRC, setting up cloud bookkeeping, and understanding which filings and deadlines will apply. The decisions made at the start — structure, how you take money out, VAT timing — are the hardest to undo later. For American founders launching in the UK, structure choice also carries US consequences such as Form 5471 and GILTI, so cross-border advice before incorporating matters.
Starting a business is the moment when the right accounting advice is worth the most — because the decisions you make now are the hardest to change later. The biggest one is your structure: trading as a sole trader is simple and light on admin, while a limited company is a separate legal entity that can offer protection and efficiency, at the cost of more reporting.
Around that sit the practical foundations: registering with Companies House and HMRC as appropriate, setting up business banking, putting cloud bookkeeping in place, and knowing which filings and deadlines will apply to you. Get these right at the start and everything afterwards is smoother; get them wrong and you spend later money fixing them.
And if you are an American founder launching in the UK, the stakes are higher still. Your structure choice has US consequences as well as UK ones — which is exactly the kind of decision a US–UK firm should shape before you incorporate, not after.
Starting up at a glance
- First decision
- Sole trader vs limited company
- Register with
- Companies House &/or HMRC
- Set up
- Banking, bookkeeping, software
- VAT
- Register when threshold met
- Best time
- Before you start trading
- US founders
- Structure affects US tax too
Who this is for
- First-time founders deciding how to set up
- Sole traders considering incorporating
- Freelancers and contractors going limited
- Startups wanting clean foundations from day one
- American founders launching a UK business
- Anyone unsure which structure or registrations they need
Sole trader or limited company?
This first choice shapes much of what follows. A sole trader setup is quick, with simpler reporting through Self Assessment. A limited company separates you legally from the business, can be more tax-efficient in the right circumstances, and may look more established to clients — but brings statutory accounts, a CT600 and more admin. The right answer depends on your income, risk and plans, and is worth deciding deliberately rather than by default.
Getting the foundations in place
Beyond structure, a clean start means registering correctly, separating business banking, and setting up cloud bookkeeping (such as Xero or QuickBooks) so you are Making Tax Digital ready from the outset. We also make sure you understand which deadlines — from Self Assessment to Corporation Tax — will apply to you, so nothing is a surprise.
Common mistakes we see
The recurring ones: picking a structure by default rather than by analysis; mixing personal and business money from the start; leaving bookkeeping until it becomes a mess; missing registration deadlines for taxes that now apply; and — for American founders — incorporating a UK company without checking the US side, creating a structure that is efficient in the UK but penalised by the IRS.
For American founders in the UK
If you hold US citizenship and are starting a UK business, your structure decision is genuinely two-sided. A UK limited company owned by a US person can bring Form 5471 obligations and GILTI exposure on the US side. Deciding how to set up before you incorporate — with both tax systems in view — can save you from an expensive restructure later.
How we handle it
From idea to set up properly
Choose the structure
We weigh sole trader versus limited company for your situation — on both UK and, where relevant, US terms.
Register everything
We handle incorporation and the right HMRC registrations so you start fully compliant.
Set up your systems
We get cloud bookkeeping, banking and processes in place so your admin is clean from day one.
Map your obligations
We give you a clear calendar of which filings and deadlines apply, and support you through the first ones.
Related areas we handle
Frequently asked questions
It depends on your circumstances. A sole trader is simpler to set up and run, with lighter admin, while a limited company is a separate legal entity that can offer liability protection and, in some cases, tax efficiency — but with more reporting obligations. The right choice depends on your income, risk, plans and personal situation, which is why it is worth deciding deliberately at the start.
Typically: choosing your structure, registering appropriately (with Companies House if incorporating, and with HMRC for the relevant taxes), setting up business banking, putting bookkeeping software in place, and understanding which filings and deadlines will apply to you. Getting this foundation right from day one saves expensive corrections later.
Ideally before or at the point of starting, not a year in. Early advice shapes the decisions that are hardest to undo later — your structure, how you take money out, your VAT position and your record-keeping. An accountant involved from the start helps you avoid the common early mistakes rather than fixing them afterwards.
Not necessarily at the start — VAT registration is generally required once your turnover crosses the current threshold, though you can register voluntarily earlier if it benefits you. For a new business, the key is knowing where the threshold sits, tracking your turnover, and registering at the right time rather than too late.
A great deal, because your structure choice has US consequences as well as UK ones. A UK limited company owned by a US person can trigger US filings such as Form 5471 and rules like GILTI, and how you set things up affects both tax systems. Getting US-UK advice before you incorporate can prevent costly structures that are efficient in one country but punished in the other.
Yes. We help new businesses set up cloud accounting software such as Xero or QuickBooks from the start, with the right configuration, so your records are clean, Making Tax Digital ready, and easy to build on as you grow — rather than something you have to untangle later.
Starting a business? Start it set up right.
The decisions you make at the start are the ones hardest to undo. Book a free consultation and we'll help you choose the right structure and set up your business cleanly — on both sides of the Atlantic if needed.