Verified AccountantsUK firms, verified against the public record
One Abacus Limited website icon

One Abacus Limited

Accountant in London SE25

Verified & RegulatedTrust Score100/100Excellent

Companies House: 0986182621 Hambrook Road, London, SE25 4HLData updated 07 Jul 2026

In the local market

One Abacus Limited is one of 4856 accountancy practices we verify in London. It advertises a wider range of services than most firms we list in London.

Verified Accountants assessment

One Abacus Limited is a UK limited company based in London, incorporated in 2015 and trading for 11 years.

Public records confirm it is anti-money-laundering supervised by AAT, a member firm of AAT, up to date with its accounts (last filed 30 Nov 2025), and running a confirmed website. Its website shows it handles Small business, Self Assessment, VAT, and Payroll and works with Xero and FreeAgent.

How we verify →

Verification record and Trust Score

100/100

Trust Score

Excellent
Public record
AML supervised · AAT
Active company
Filing compliant
Trading 10 years
Professional qualification
  • AAT
  • ICAEW
  • ACCA
Contact
Website
Phone
Email

The Trust Score is the share of the applicable public signals we have verified, scored out of 100 - fully deterministic, never subjective. How it is scored, and every signal's points →

Companies HouseActiveno. 09861826 (opens in new tab)incorporated 2015Companies House · checked 07 Jul
Registered activity
  • SIC 69201 - Accounting and auditing
The business activity the firm registered with Companies House (its Standard Industrial Classification).Companies House · checked 07 Jul
Filing complianceAccounts and confirmation statement filed on timelast accounts 30 Nov 2025 (opens in new tab)Companies House · checked 07 Jul
Professional bodyMember firm of AATFMAAT · licence 1002102Association of Accounting Technicians (AAT) is a UK professional accountancy body. Member firms must meet its qualification and conduct standards and can be disciplined by it.AAT · checked 17 Jul
Anti-money-launderingSupervised by AATAAT is one of the professional bodies approved to supervise accountants for anti-money-laundering. Every UK accountant must be supervised, by HMRC or an approved professional body, so this confirms the firm is monitored and operating legitimately.AAT · checked 17 Jul
Sources: Companies House (opens in new tab), AAT
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Good fit for

  • Works in Xero and FreeAgent
  • Handles Small business, Self Assessment, VAT and Payroll

Specialisms and services

Certified
Xero Silver Partner - since 2016
Services
AccountantSmall businessSelf AssessmentVATPayrollBookkeepingLimited company accountsContractorCISCompany Formation
Software
FreeAgent

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Addresses

Registered office Companies House
21 Hambrook Road, London, SE25 4HL
Office Google Business Profile
Parkhall Business Centre, 40 Martell Rd, London, SE21 8EN

The registered office is the firm's address on the Companies House register; the office is the trading address on its confirmed Google Business Profile. They can differ.

People at One Abacus Limited

Persons with significant control (2)

  • Mr Ryan MortonOwns 25-50% of shares, 25-50% of voting rights, Can appoint or remove directors
  • Mr Simon Nicholas McdonaghOwns 25-50% of shares, 25-50% of voting rights

Source: Companies House register (opens in new tab).

Financials (as filed)

Companies House filing history (opens in new tab) | 2022 to 2025
Net assets
£100
as at 30 Nov 2025-£17k vs 2024
Current assets
£74k
as at 30 Nov 2025+£71k vs 2024
Cash at bank
-£13k
as at 30 Nov 2025-£3.3k vs 2024
Average employees
2
as at 30 Nov 2025
Current assets (cash, debtors, other) and net assets by year, in £. Latest year first.
2025202420232022
CashDebtorsOtherNet assets
Full figures
As filed30 Nov 202530 Nov 202430 Nov 202330 Nov 2022
Average employees2222
Net assets£100£17,037£103£1,612
Cash at bank-£13,071-£9,792£4,567£53,936
Current assets£73,570£2,269£42,229£88,568
Debtors£75,216£12,061£37,662£34,632

Figures as reported in this firm's accounts filed at Companies House. Net assets is total assets less what the company owes; a figure below zero means recorded liabilities exceed assets. Small companies may file abbreviated accounts that omit turnover and profit. Public record, reproduced as facts.

Timeline

  1. 2015Company incorporated
  2. 2025Latest accounts filed
  3. 2026Verified on this directory

Frequently asked questions

Is One Abacus Limited a regulated accountant?

Yes. One Abacus Limited is a member firm of AAT, and is supervised for anti-money-laundering by AAT. Every UK accountant must be supervised for anti-money-laundering, by HMRC or an approved professional body, so this confirms the firm is authorised to practise and monitored for compliance.

Is One Abacus Limited a chartered accountant?

One Abacus Limited is a member firm of AAT, a UK professional accountancy body, but it is not a chartered firm. Chartered status is conferred only by bodies such as ICAEW, ICAS or ACCA.

Where is One Abacus Limited based?

One Abacus Limited's registered office is 21 Hambrook Road, London, SE25 4HL, but it trades from Parkhall Business Centre, 40 Martell Rd, London, SE21 8EN (from its confirmed Google Business Profile). A registered office is the address on the Companies House register and can differ from where a firm actually works.

What services does One Abacus Limited offer?

Based on its own website, One Abacus Limited offers Small business, Self Assessment, VAT, Payroll, Bookkeeping, and Limited company accounts. Confirm current services and availability with the firm before engaging. Message this firm →

What accounting software does One Abacus Limited use?

One Abacus Limited is Xero (Silver partner), so it works with Xero. Certified partners are trained on the software and listed in the vendor's own advisor directory.

How long has One Abacus Limited been established?

One Abacus Limited was incorporated at Companies House in 2015, so it has been on the register for about 11 years. A longer trading history is one sign of an established, accountable firm, though a newer firm is not necessarily less capable.

Does One Abacus Limited file its accounts on time?

Yes. According to Companies House, One Abacus Limited's most recent statutory accounts were filed by their due date. On-time filing is a basic sign that a company is being administered properly.

How do you verify One Abacus Limited?

We build this record only from public, authoritative sources - for this firm, Companies House and AAT, and stamp every claim with its source and the date we last checked it. We show only what we can verify and say so plainly when we cannot. How we verify →

How is the Trust Score calculated?

The Trust Score is fully deterministic: fixed points for public, verified signals - an active company, anti-money-laundering supervision, filing compliance, a confirmed website and trading history. One Abacus Limited scores 100/100. Nothing in the score is subjective, and every rule is listed on this page. How we verify →

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