Keep your books current enough to make decisions from them.
Bookkeeping Services for UK Businesses
Bookkeeping shouldn’t be a once-a-year exercise in working out where the money went. We keep transactions recorded and accounts reconciled regularly, so you can see what your business looks like now.









Beyond offering services, we complement your journey with our commitment to Satisfaction
Success In Numbers
Our Bookkeeping Services
By the time an annual bookkeeping catch-up is finished, the tax year it covers is already closed. There's nothing left to plan around, you're just documenting what already happened, too late to change any of it.
We reconcile monthly instead, whether you need full outsourced bookkeeping services or just want to outsource your bookkeeping for the parts that eat up your week. Not because it sounds better, because it means your accountant, your lender, and you are all looking at numbers that are actually current when a decision needs making.
We've kept books accurate, not just tidy, since 2008, offering genuine bookkeeping help for small business owners who've been trying to keep on top of it alone. The businesses that come to us with a backlog almost always say the same thing, they meant to keep on top of it. We make sure that's never something you have to mean to do.
What We Offer
Accounting software set-up
Monthly transaction recording
Bank and account reconciliation
Accounts payable management
Accounts receivable management
Historical books cleanup
Financial statement preparation
White-label bookkeeping for accountancy practices
Tailoring Success Across Industries
Mercurius delivers precise bookkeeping 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
Seeking custom services?
Drop your email, and we’ll get in touch, or contact us directly.
Why Outsource Your Bookkeeping to Us?
Regular Updates
Account Reconciliation
Ledger Management
Backlog Cleanup
Software Integration
Cost Efficiency
Client Testimonials
Great work – love the dedicated member of the team that is assigned to work on my account.
Graham Blair
Habitat Seven Inc 🇨🇦
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.
Cameron Kincaid
Chemeyes Ltd 🇬🇧
Siddhartha is delightful to work with and always completes assignments ahead of schedule and with no iteration needed.
Mike Schoenfeld
MBS Consulting🇺🇸
Pleasant to work with, knowledgeable on accounting principles, responsive
Christine Atieno
Keys Please Homes🇺🇸
Sid and his team so excellent work – on time and very attentive to detail.
Joel Cape
Joel E Cape, PLC🇺🇸
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
How much is a bookkeeper per hour in the UK?
Hourly bookkeeping rates vary depending on the bookkeeper’s experience, location, software knowledge, and the complexity of your accounts. Some businesses prefer hourly support, while others choose fixed-fee bookkeeping services based on their transaction volume and monthly requirements. Comparing the total service and what’s included is often more useful than comparing hourly rates alone.
What's the difference between accounting and bookkeeping services?
Bookkeeping involves recording and reconciling your day-to-day transactions, invoices, bills, and bank activity. Accounting uses those records for tax filings, financial statements, reporting, and financial planning. Bookkeeping services focus on keeping your records accurate and up to date, while accounting covers the wider financial and compliance picture.
Why does bookkeeping matter for a small business?
Accurate bookkeeping gives you a reliable view of your income, expenses, cash position, and outstanding payments. It also provides the records needed for tax filings and financial reporting. Small business bookkeeping services can help owners keep these records current without having to manage every transaction themselves.
Can I use a spreadsheet instead of proper bookkeeping software?
It depends on your circumstances and whether your business falls within Making Tax Digital requirements. Where digital record-keeping is required, HMRC expects businesses to use compatible software, although spreadsheets may still be used in certain circumstances when connected through appropriate bridging software. Online bookkeeping services can help businesses maintain digital records while keeping their accounting process organised.
What happens if HMRC investigates my books and they're a mess?
HMRC can request records during an enquiry and may apply penalties where records are missing, inaccurate, or inadequate. If your records cannot support your tax return, HMRC may also make its own assessment based on the information available. Keeping your bookkeeping services up to date throughout the year can make it easier to respond if HMRC asks for supporting records.
Is bookkeeping itself tax deductible as a business expense?
Generally, yes. Professional bookkeeping and accounting fees incurred wholly and exclusively for business purposes can usually be claimed as allowable business expenses, subject to the normal tax rules. This means the cost of bookkeeping services may reduce your taxable profit.
How far behind can my books be before it becomes a real problem?
There is no single deadline that determines when bookkeeping becomes a problem, but the longer your records remain out of date, the harder it can be to identify errors and meet upcoming tax or reporting deadlines. A backlog can also make it difficult to understand your current cash position. Bookkeeping help for small business can be useful when records have fallen behind and need to be brought up to date.
Do bank statements count as proof of a business expense if HMRC asks?
Bank statements show that a payment was made, but they may not provide enough information to establish the nature and business purpose of the expense. You should keep the relevant invoices, receipts, or other supporting documents alongside your bank records. Good bookkeeping services should keep these records organised and linked to the relevant transactions.
Can Maspartner take on bookkeeping for a practice's overflow clients under our own name?
Yes. Maspartner can provide outsourced bookkeeping services on a white-label basis, allowing accounting practices to keep the client relationship under their own name while we handle the agreed bookkeeping work in the background. The arrangement can be structured around the practice’s existing processes, software, and client requirements.






