United Kingdom
Corporation Tax, VAT, and Making Tax Digital compliance — handled by a team that tracks Companies House and HMRC deadlines as closely as you do.
HMRC Doesn't Send A Reminder Before The Penalty.
UK compliance runs on fixed, unforgiving deadlines — Corporation Tax due 9 months and 1 day after your accounting period ends, annual accounts due 9 months after that, and VAT returns that must go through Making Tax Digital-compatible software with no exceptions. As of April 2026, the joint HMRC/Companies House filing route also closed, so Company Tax Returns now require standalone commercial software. Businesses that get caught out usually aren't careless — they just didn't know the joint filing route they'd always used had quietly disappeared.
The full scope of UK-market work, handled end to end.
Here's exactly what that looks like handled properly:
Built for businesses operating in or expanding into the UK.
Accounting & CPA firms
White-label UK compliance support for your international clients, delivered under your own brand.
Businesses in United Kingdom
Direct accounting, tax, and compliance support for businesses operating a UK entity or subsidiary.
If you have a single, simple UK entity with an existing accountant already filing correctly through MTD-compatible software, you likely don't need a new partner for this market specifically.
What We're Tracking In The UK Right Now.
UK compliance runs on fixed statutory deadlines with real penalties. Here's a sample of what we track, right now, for businesses operating here.
Corporation Tax Deadline
UK Corporation Tax payment is due 9 months and 1 day after your accounting period ends, with the CT600 return itself due 12 months after — two separate deadlines businesses often confuse.
VAT & Registration
UK VAT sits at 20%, mandatory above £90,000 taxable turnover. Every VAT-registered business must keep digital records and file through MTD-compatible software, without exception.
Joint Filing Route Closed
The joint HMRC/Companies House filing service closed in April 2026. Company Tax Returns to HMRC now require standalone commercial software — annual accounts can still go via Companies House's own web service.
Companies House Accounts
Annual accounts must be filed with Companies House within 9 months of your accounting reference date, with automatic penalties from £150 to £1,500 for late filing.
A documented process, from scoping to your first UK filing.
Click a step to see how it works.
Free consultation
We learn your entity structure, current filing status, and which deadlines are coming up.
Scope & proposal
A clear list of deliverables, deadlines, and turnaround times.
Secure onboarding
NDA signed, access set up, prior filings reviewed for gaps.
Filing & advisory
Corporation Tax, VAT, and Companies House filings delivered on schedule.
The advantage isn't knowing UK tax law. It's knowing exactly when the rules quietly changed.
The CATO closure caught plenty of experienced UK businesses off guard, not because the rule was complicated, but because nobody was watching for it. That's the real value of a team that tracks regulatory changes continuously, rather than finding out at filing season.
Pricing depends on scope, not guesswork.
Entity size
Turnover and balance sheet position.
VAT status
Whether you're VAT-registered and at what volume.
Frequency
Monthly, quarterly, or annual filing cadence.
There's no flat rate that fits a small single-entity business and a VAT-registered group the same way, so we don't pretend there is. Most engagements are scoped and quoted on the first call, not after weeks of back-and-forth.
Why not just hire a local UK accountant?
A fair question — here's how the trade-off actually looks.
Hiring Locally
Partnering with Corptiva
Case studies from this market.
Migrating a client off the closed CATO joint filing route without missing a deadline
What a proactive regulatory-change response looks like when HMRC's filing infrastructure shifted underneath an existing client relationship.
Fluent in the tools you already use.
What clients usually ask.
It affects unrepresented companies who used the joint route directly — most businesses working with an accountant like us were already filing through commercial software.
Yes, both are coordinated as part of the same engagement, along with Companies House filings.
Yes — this is a common way engagements start, with a clean handover process.
Yes, including UK GAAP to parent-company IFRS or US GAAP reconciliation.
We assess the penalty exposure honestly and help you file and remediate as quickly as possible.
Yes, payroll processing and PAYE compliance are part of this practice.
One call to see if we're the right fit — no pitch, no pressure.
Tell us what you're dealing with — messy books, a firm outgrowing its bandwidth, a market you haven't worked in before. We'll tell you honestly whether Corptiva is the right partner for it.