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Chartered Accountants

Bespoke financial strategy, built around you.

From entrepreneurs and sole traders to high-net-worth individuals — we deliver digital-first accounting and strategic tax planning that gives you clarity, confidence, and control.

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Xero
Certified cloud accounting partner
MTD
Making Tax Digital ready & compliant
ICAI
Chartered & regulated accountants
SME · HNWI
Sole traders, entrepreneurs & private clients
Entrepreneurs◆ Sole Traders◆ Self-Employed◆ SMEs◆ HNWIs◆ Corporation Tax◆ Self Assessment◆ Making Tax Digital◆ Xero Certified◆ Cloud Bookkeeping◆ Tax Planning◆ VAT Returns◆ Payroll◆ Entrepreneurs◆ Sole Traders◆ Self-Employed◆ SMEs◆ HNWIs◆ Corporation Tax◆ Self Assessment◆ Making Tax Digital◆ Xero Certified◆ Cloud Bookkeeping◆ Tax Planning◆ VAT Returns◆ Payroll◆

We don't just balance books.
We build financial frameworks for businesses that are going places.

01
Cloud-native infrastructure
Xero-powered, MTD-compliant, and fully accessible in real time. Your finances visible anywhere, always.
02
Rigorous due diligence
Every number checked, every filing verified. Chartered standards applied to every engagement, regardless of size.
03
Commercially minded
We look beyond the return. Strategic advice that protects your assets, reduces your liability, and fuels your growth.

Who we work with

Built for the
self-made and
the ambitious.

Whatever stage you're at — going it alone for the first time, scaling a growing company, or managing significant personal wealth — we have the depth of expertise to match your ambitions.

01
Entrepreneurs & Startups
From day-one setup to Xero integration and first-year accounts. We handle the financial groundwork so you can focus entirely on building your vision.
02
Sole Traders & Self-Employed
Making MTD for ITSA seamless and tax optimisation a priority. Whether you're a freelancer, contractor, or independent professional — we make compliance simple.
03
SMEs & Private Clients
Scaling businesses and managing personal wealth with expert oversight. From corporation tax to capital gains — the strategic layer that growing companies and HNWIs require.
Making Tax Digital

MTD for Income Tax is now live. Sole traders and landlords are required to report income digitally on a quarterly basis. See how we can help →

About Arithmo

Where commercial
foresight meets
technical precision.

Arithmo was founded to bring high-level financial strategy to the modern business landscape. Whether you are a sole trader just starting out, an entrepreneur scaling a startup, or a high-net-worth individual managing a complex portfolio — you deserve more than a bookkeeper. You deserve a commercial partner.

Our philosophy

Innovation.
Integrity.
Impact.

We operate at the intersection of innovation and integrity. By combining the latest cloud technology with the rigorous standards of Chartered Accountancy, we deliver a service that is both agile and dependable.

We've stripped away old-school accounting friction to offer a streamlined, digital-first experience that never compromises on technical precision.

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Our commitment

i.
Tailored to you
From self-employed professionals to established SMEs, every service is scaled to your specific needs. We don't apply a one-size-fits-all approach — ever.
ii.
Future-ready compliance
We lead the way in MTD for IT and digital compliance, ensuring you stay ahead of HMRC's shifting requirements — before the deadlines arrive.
iii.
Commercially minded
We look beyond the tax return — providing the due diligence and strategic foresight required to protect your assets and fuel your growth.
iv.
Transparent & dependable
Fixed, agreed fees. No surprises. No scope creep. Honest, high-quality work delivered on time — every time.
v.
A genuine partnership
We invest time in understanding your world. The advice you receive reflects where you are today and where you want to be tomorrow.

The Arithmo difference

Digital-first.
Precision-driven.
Genuinely personal.

Whether you are a sole trader just starting out, an entrepreneur scaling a startup, or a high-net-worth individual managing a complex portfolio — you deserve a firm that understands your ambitions and has the tools and expertise to help you realise them.

Arithmo was built for exactly that. Modern infrastructure. Chartered standards. A partner mentality.

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What we do

Services that go
beyond compliance.

Every service delivered with commercial intelligence — not just technical accuracy. Cloud technology, rigorous compliance, and always looking at what's next for your business.

Annual Statutory Accounts
Preparation and submission to Companies House. Accurate, comprehensive, and fully compliant — with a commentary you can actually use.
Corporation Tax
Proactive CT600 planning and filing. We identify every legitimate relief so you never pay more than you should.
VAT Management
Registration and MTD-compliant digital submissions. Timely and accurate — no missed deadlines, no missed reclaims.
Company Secretarial
PSC registers, confirmation statements, and board minutes. Your statutory obligations — kept clean and current.
Xero Implementation & Optimisation
Full setup, migration, and ongoing optimisation of your Xero environment. Real-time visibility into your finances, always.
MTD for ITSA Readiness
MTD for Income Tax is now live. We'll get sole traders and landlords set up on compatible software, quarterly workflows established, and fully compliant with HMRC's digital reporting requirements.
Real-Time Bookkeeping
Tailored monthly or quarterly processing. Your books in order, always accessible, with clean data you can act on immediately.
Management Accounts
P&L, balance sheet, cash flow, and KPI dashboards delivered on your schedule. Reporting that drives performance.
Self-Assessment Tax Returns
For sole traders, self-employed professionals, entrepreneurs, directors, and high earners. Every allowance identified, every return filed on time.
Strategic Tax Planning
Comprehensive planning across income, capital gains, and inheritance tax. We look at your entire financial picture — not just the current year.
Capital Gains Tax (CGT)
Expert reporting on property, investments, and business disposals. Structured to minimise your liability within the rules.
HMRC Correspondence
We act as your dedicated agent — handling all HMRC enquiries, investigations, and correspondence directly on your behalf.
Virtual FD / CFO
Senior financial leadership without the full-time cost. We act as your part-time Finance Director or CFO — providing strategic oversight, board-level reporting, and the commercial insight to help you make better decisions.
Full-Service Payroll
Accurate, on-time payroll for any team size. Pensions, auto-enrolment, RTI submissions, and all HMRC correspondence handled end-to-end.
Due Diligence
Financial health checks for acquisitions, investment rounds, and partnership decisions. Rigorous, independent, and commercially framed.
Business Advisory
Guidance on cash flow, budgeting, and growth strategy. The kind of commercially minded advice that actually moves the needle.
Making Tax Digital

MTD for Income Tax is now live. Sole traders and landlords must report income digitally each quarter. We'll get you set up and fully compliant. Get in touch →

Get in touch

Let's build your
financial future.

Whether you're a sole trader looking to get your finances in order, an entrepreneur ready to scale, or a private client with more complex needs — we'd love to hear from you. Get in touch and a Chartered Accountant will come back to you personally.

Free · No obligation
Secure a 30-minute discovery call.

Discuss your requirements directly with a Chartered Accountant. A clear, honest conversation about how we can help — with no commitment required. Reach us by email, phone, or WhatsApp.

Direct contact

✉
Email
mail@arithmo.uk
We aim to respond within one working day
☎
Phone & WhatsApp
+44 7343 086 046
WhatsApp also available on this number
📍
Location
London, United Kingdom
Serving clients across the UK and Ireland

Regulated & compliant

Arithmo Asset Services Ltd (trading as Arithmo Chartered Accountants) is regulated by the Institute of Chartered Accountants in Ireland (ICAI). We are registered for anti-money laundering supervision in accordance with the Money Laundering Regulations and comply fully with our obligations under applicable AML legislation.

If you have a complaint, please contact us at mail@arithmo.uk. We have a formal complaints procedure and will acknowledge your complaint within five working days.

Legal

Privacy Policy.

Last updated: April 2026. This policy explains how Arithmo Asset Services Ltd, trading as Arithmo Chartered Accountants, collects, uses, and protects your personal information.

1. Who we are

The data controller is Arithmo Asset Services Ltd, trading as Arithmo Chartered Accountants. Company registration number 15701621, registered in England and Wales. Registered office: 124 City Road, London, EC1V 2NX.

If you have any questions about how we handle your personal data, or wish to exercise any of your rights, please contact us at mail@arithmo.uk.

2. What personal data we collect

We may collect and process the following categories of personal data:

  • Contact and identity information — name, email address, phone number, and correspondence sent to us directly.
  • Financial and tax information — income, expenses, tax returns, bank statements, and other financial records necessary to provide our services.
  • Business information — company details, director information, payroll records, and VAT information.
  • Identity verification data — as required under our Anti-Money Laundering obligations, we may collect copies of identity documents such as passports or driving licences.

We collect this data directly from you, from HMRC or Companies House where relevant, or from third parties such as Xero in the course of providing our services.

3. Why we collect it and our legal basis

  • Performance of a contract — to provide accounting, tax, and advisory services you have engaged us for.
  • Legal obligation — to comply with HMRC requirements, anti-money laundering legislation, and our regulatory obligations under ICAI.
  • Legitimate interests — to respond to enquiries, manage our client relationships, and improve our services.
  • Consent — where you have specifically consented, for example to receive communications from us.

4. How long we keep your data

We retain client records for a minimum of six years following the end of the engagement, in line with HMRC requirements and our professional obligations. Identity verification records required under AML legislation are retained for five years after the end of the business relationship.

Where you have contacted us but not become a client, we will retain your correspondence for up to two years.

5. Who we share your data with

We do not sell your personal data. We may share it with the following parties where necessary:

  • HMRC — in the course of filing tax returns and submissions on your behalf.
  • Companies House — for statutory filings.
  • Xero — our cloud accounting platform, used to process and store financial data on your behalf.
  • ICAI — our regulatory body, in the event of a practice review or regulatory enquiry.
  • Professional advisers — such as solicitors or other accountants, where required to deliver our services.

6. Your rights

Under UK GDPR, you have the following rights:

  • The right to access the personal data we hold about you.
  • The right to rectification of inaccurate data.
  • The right to erasure in certain circumstances.
  • The right to restrict processing in certain circumstances.
  • The right to data portability where processing is based on consent or contract.
  • The right to object to processing based on legitimate interests.

To exercise any of these rights, please contact us at mail@arithmo.uk. We will respond within one calendar month. You also have the right to lodge a complaint with the Information Commissioner's Office (ICO) at ico.org.uk.

7. Security

We take reasonable technical and organisational measures to protect your personal data against unauthorised access, loss, or destruction. All client financial data is processed through Xero, which is ISO 27001 certified. We review our security practices regularly.

8. Cookies

This website does not use tracking cookies, analytics tools, or any third-party scripts that set cookies. The only technology in use is Google Fonts, which may load fonts from Google's servers. No personal data is stored in your browser by this website.

9. Changes to this policy

We may update this policy from time to time. The current version will always be published on this page with the date it was last updated. We recommend checking this page periodically.

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