Get the expertise of an in-house finance team without the cost of building one
Accounting Services for UK Businesses
Covering everything from bookkeeping and VAT returns to Corporation Tax and management accounts, our online accounting services ensure your finances are handled by experienced professionals who file early, review twice, and never leave a deadline to chance.
Beyond offering accounting services, we complement your journey with our commitment to Satisfaction
Success In Numbers
Our Accounting Services
Choosing someone to handle your finances is about more than finding a provider who can file a tax return. You need to know who's looking after your books, whether they'll understand your business, and whether something will be caught before it becomes a problem.
That's how we've built our service.
You get a dedicated accountant who knows your business and stays with your account whether you're looking for accounting services or need someone to just hire an accountant for a single tricky filing. Your bookkeeping, tax filings and management accounts are handled by the same team rather than passed between different people. And before a filing goes out, it goes through an AI check and a qualified accountant review.
Your financial information is handled under the relevant UK data requirements, with the right processes in place from the start.
Maspartner has been supporting businesses with accounting and financial operations since 2008. Our UK service brings that experience to businesses that want experienced accounting support without the cost and commitment of building the same capability in-house.
Services We Offer
Bookkeeping
- Accounting software set-up
- Monthly transaction recording and reconciliation
- Accounts payable and receivable management
- Historical books cleanup
Tax Returns
- VAT registration and VAT filing
- Corporation Tax return (CT600)
- Self Assessment (SA100)
- Confirmation Statement
- Annual accounts for Companies House
Payroll
- PAYE registration and payroll set-up
- RTI submissions (FPS and EPS)
- P11D reporting for benefits in kind
- Pension auto-enrolment compliance
Reporting & Compliance
- Monthly and quarterly management accounts
- Making Tax Digital set-up and filing
- Support switching from your current accountant
Tailored Support Across Industries
Mercurius delivers precise financial solutions & accounting services backed by industry expertise, ensuring accurate and reliable results across all sectors.
Accounting, Tax and CPAs
Ecommerce and Retail
Law firms and Attorneys
Real Estate and Construction
Education and Coaching
Why Outsource Your Accounting to Us?
Client Testimonials
Great work – love the dedicated member of the team that is assigned to work on my account.
Manvi and the team at Mercurius are excellent. We have been working with them for a number of years and they have been pivotal in keeping our accounts in good order.
Siddhartha is delightful to work with and always completes assignments ahead of schedule and with no iteration needed.
Pleasant to work with, knowledgeable on accounting principles, responsive
Sid and his team so excellent work – on time and very attentive to detail.
Why Mercurius?
100+ Ratings on Google
Experience the services that’s earned us top ratings.
Smart Savings
Senior accounting expertise without full-time salaries, benefits, or software overhead.
Total Safety
UK GDPR and data protection compliance built right into the process.
Dedicated Lead
A single accountant who knows your business inside and out.
Proactive Guidance
Our experts provide valuable insights and accounting services to help you make informed business decisions.
Software Expertise
FAQs
What do business accounting services include?
Business accounting services can include bookkeeping, VAT returns, payroll, Corporation Tax, annual accounts, and management accounts, depending on what your business needs.
When these services are handled together, your financial records stay connected from day-to-day bookkeeping through to tax filings and financial reporting. For example, accurate bookkeeping provides the figures used for your VAT return, annual accounts, and management reports. Maspartner brings these accounting services together so businesses can manage their financial requirements through one team.
What's the real difference between online accounting services and a local firm?
The main difference is how the service is delivered, rather than the standard of accounting. Online accounting services use cloud software and remote communication, so you can work with your accountant without visiting a physical office.
A local firm may offer face-to-face meetings, while an online provider may offer more flexible communication through calls, email, and messaging. The important factors are the provider’s qualifications, experience, software, response times, and understanding of your business, rather than whether their office is nearby.
How much do small business accounting services cost in the UK?
The cost depends on your turnover, transaction volume, VAT registration, payroll, and the level of support you need. Many small businesses choose fixed monthly fees, while some accountants charge by the hour.
Before choosing a provider, ask for a clear breakdown of what’s included in the fee. This should cover specific accounting services, such as bookkeeping, VAT returns, payroll, and annual accounts, rather than a broad description like “accounting support.” A fixed fee can also make your monthly costs easier to plan.
Do I legally need to hire an accountant for my small business?
No. UK businesses are not generally required to hire an accountant, but they are responsible for keeping accurate records and meeting their HMRC and Companies House obligations.
The decision usually comes down to the complexity of your finances and how much time you can manage yourself. If you’re dealing with VAT, payroll, Corporation Tax, Making Tax Digital, or more complex expenses while running the business, professional online accounting services can make these responsibilities easier to manage.
Can I switch accountants mid-year without disrupting my business?
Yes. You don’t have to wait until the end of your financial year to change accountants. The new accountant will normally need to obtain professional clearance and complete the relevant HMRC agent authorisations before taking over.
The timing can still matter if you are close to a VAT, payroll, tax, or annual accounts deadline. Giving both accountants enough time to complete the handover helps make the transition smoother and reduces the risk of important records or deadlines being overlooked.
What's the difference between bookkeeping and accounting services?
Bookkeeping records your day-to-day financial activity, including transactions, invoices, bills, and bank reconciliations. Accounting services go further by using those records for tax filings, financial reporting, compliance, and financial planning.
Keeping both functions connected can make it easier to identify errors and keep your financial information consistent. For example, accurate bookkeeping provides the foundation for your VAT returns, annual accounts, and Corporation Tax calculations.
Is it safe to hand over financial data to an online accounting provider?
It can be, provided the provider has appropriate data protection, security, and access controls in place. Online accounting services commonly use cloud-based accounting platforms, allowing financial records to be accessed and managed remotely.
Before choosing a provider, ask how your data is stored, who can access it, how access is protected, and what happens to your records if you stop using the service. Maspartner uses established accounting platforms and defined processes to manage client financial information throughout the engagement.
How do I know if I need to hire an accountant now or wait?
Consider professional support when your financial responsibilities are becoming difficult to manage alongside running the business. VAT registration, payroll, growing transaction volumes, multiple income streams, or more complex tax requirements can all be signs that you may benefit from professional small business accounting services.
For example, businesses approaching the £90,000 VAT registration threshold need to understand their obligations and prepare for Making Tax Digital for VAT. You don’t have to hire an accountant at a particular turnover, but getting advice before your finances become more complicated can help you plan and avoid last-minute compliance work.
