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Business Owners

Expert cross-border accountancy for fast-moving businesses.

In today’s fast-paced business landscape, start-ups, scale-ups, and established companies all face increasing financial complexity. That’s why our UK and US-based accountants provide a full suite of advisory and business management services – ensuring your accounts and taxes are handled accurately across both jurisdictions.

We are detailed driven

Seamless support for international business income.

Your business income may come from a variety of sources—but we’ll make sure everything is accurately accounted for.

We offer a fully transatlantic service, ensuring your legal entities comply with local regulations wherever you operate, including when setting up branch offices overseas.

Always by your side

Global tax advice you can trust.

Our experienced accountants ensure you always pay the right amount of tax – no more, no less—with no unexpected surprises.

If your income includes revenue from outside the UK, we’ll advise you on the most efficient global tax structure to minimise both personal and corporate tax liabilities.

Protecting your hard work

Helping you make the most of your success.

We’ll take care of your financial affairs so you can stay focused on growing your business.

We can’t make you rich—but we can help you keep as much of your hard earned income as possible.

Committed to your success

Here are just a few of the challenges you might face… and how we can help:

Expert support for company formation, tax efficiency, and global compliance.
We keep a close eye on both UK and international legislation to ensure you retain as much of your earnings as possible—while paying no more tax than necessary.
Whether you’re forming a new company or managing an existing one, we’ll advise you on:
  • Efficient company formation
  • Governance and best practices
  • Capital structuring and share reorganisation
At Sirius, your dedicated accountant will optimise your tax affairs and help you avoid common pitfalls. Even if you’re managing multiple projects across the UK and abroad, we’ll ensure you only pay the tax you owe.
The UK has a network of Double Taxation Treaties with many countries, and we’ll help you take full advantage – minimising international tax exposure.
We’ll also guide you through residency rules, including the impact of the Statutory Residence Test on your income tax obligations. UK residents are generally taxed on their worldwide income, but where foreign tax is also due, relief may be available.
Above all, we’ll ensure you meet all statutory requirements, with regular reviews to make sure our services continue to meet your evolving needs.

Our Services

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