Outsourced invoice processing can cover anything from basic invoice entry to a managed accounts payable function with approval workflows, supplier reconciliations, payment preparation, and reporting. This guide highlights a selection of London providers rather than ranking them, with a focus on companies that can take responsibility for recurring invoice and purchase ledger work.
Acumon
Acumon is a UK firm of chartered accountants and registered auditors providing outsourced invoice processing and wider accounting support to businesses in London and across the UK. The firm works with organisations ranging from growing owner-managed businesses and SMEs through to larger corporate groups that need additional support with day-to-day finance administration. Outsourced invoice processing can form part of a broader bookkeeping and accounts payable arrangement, helping businesses maintain accurate and up-to-date financial records.
Invoice processing typically involves receiving and recording supplier invoices, allocating transactions to the appropriate nominal codes and cost centres, checking supporting information, and managing invoices through established approval procedures. These activities can be integrated with purchase ledger management, supplier account reconciliation, and preparation of payment runs.
Acumon holds a Public Interest Entity (PIE) audit licence, allowing the firm to audit listed companies and other entities subject to enhanced regulatory oversight in the United Kingdom. PIE audits are subject to additional regulatory supervision and quality requirements, and only a limited number of firms are authorised to undertake this type of work.
In addition to its UK audit registration, Acumon also holds audit licences in several international financial centres, including the Cayman Islands, British Virgin Islands (BVI), Jersey, and Isle of Man. These licences enable the firm to support international corporate groups where entities are located across multiple jurisdictions.
Businesses with large transaction volumes or complex finance structures may require consistent processes across departments, entities, or reporting periods. A structured outsourced approach can help finance teams maintain visibility over outstanding invoices, creditor balances, approvals, and upcoming supplier payments.
Acumon works with finance teams and business owners to support outsourced invoice processing while helping organisations maintain reliable purchase ledger records, improve accounts payable workflows, and keep financial information organised as transaction volumes and operational requirements grow.
Outsourced Invoice Processing Service Capabilities
Acumon provides outsourced invoice processing services across a wide range of organisational structures and sectors.
These include:
- UK limited companies and corporate groups
- Public Interest Entities (PIEs) and regulated organisations
- UK subsidiaries of international groups
- charities and not-for-profit organisations
- owner-managed businesses approaching statutory audit thresholds
- offshore holding companies and investment vehicles
Outsourced invoice processing engagements are typically led by senior professionals with direct involvement throughout the engagement.
Regulatory Licences and Registrations
Acumon holds several audit registrations that enable it to support organisations operating across multiple jurisdictions.
These include:
- UK statutory audit registration
- Public Interest Entity (PIE) audit licence
- Jersey audit licence
- Isle of Man audit licence
- Cayman Islands audit licence
- British Virgin Islands audit licence
These registrations allow the firm to provide audit services to groups that include entities in both the UK and key international financial centres.
Core Services
Acumon provides a range of services that support financial reporting and governance.
These include:
- statutory external audit
- group and subsidiary audits
- Public Interest Entity (PIE) audits
- charity and not-for-profit audit
- audit of international group structures
- internal audit and governance reviews
- risk management and compliance support
Audit work is often delivered alongside discussions with management and boards regarding financial reporting processes and governance frameworks.
Many organisations initially encounter statutory audit requirements as they grow and exceed the audit exemption thresholds set out in the Companies Act.
Acumon works with businesses that are:
- approaching their first statutory audit
- preparing for external investment
- expanding into international markets
- operating within corporate group structures
Early engagement with an audit firm can help ensure that financial reporting systems and documentation are aligned with statutory audit requirements.
Contact Information
- Website: acumon.com
- Phone: 020 8567 3451
- E-mail: [email protected]
- Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK
Saffery
Saffery offers purchase ledger management within its broader outsourcing practice. Its service is particularly relevant where businesses want supplier invoice administration connected with bookkeeping, cash flow monitoring, management accounts, and VAT work.
The purchase ledger team prepares regular creditor reports, identifies disputed items and available trade discounts, and organises proposed supplier payment runs at agreed intervals. Payments can then be raised through the client’s online banking arrangements for approval. Saffery also provides bookkeeping using systems including Sage and Xero, allowing purchase ledger activity to feed directly into wider accounting records.
Key Facts
- Ideal for: Businesses requiring invoice processing within a broader outsourced accounting function
- Core services: Purchase ledger management, creditor reporting, payment runs, bookkeeping
- Specialization: Integrated accounting outsourcing
- Software: Sage, Xero, and other accounting systems
- Location: London
- Notable strength: Purchase ledger processing linked with broader accounting and reporting services
Contact Information
- Website: www.saffery.com
- Email: [email protected]
- LinkedIn: www.linkedin.com/company/saffery
- Instagram: www.instagram.com/saffery_uk
- Address: 71 Queen Victoria Street, London EC4V 4BE, UK
- Phone: +44 (0)20 7841 4000
Haggards Crowther
Haggards Crowther operates an outsourced accounting team from London and includes purchase ledger maintenance among its day-to-day finance services. The arrangement can extend from bookkeeping and invoice administration to management reporting, cash flow forecasting, payroll, and statutory accounting support.
Clients are allocated a dedicated client manager, with the firm’s published information stating that these managers are ACA, ACCA, or CIMA qualified and based in its London office. For companies wanting to outsource more than invoice entry alone, purchase ledger work can therefore sit within a wider finance function rather than being treated as an isolated administrative process.
Key Facts
- Ideal for: Companies seeking ongoing outsourced finance support
- Core services: Purchase ledger maintenance, bookkeeping, management accounts, cash flow forecasting
- Specialization: Outsourced accounting teams
- Location: London
- Notable strength: Invoice and ledger administration within a wider finance function
Contact Information
- Website: www.haggards.co.uk
- Email: [email protected]
- Address: Heathmans House, 19 Heathmans Road, Parsons Green, London, SW6 4TJ
- Phone: 020 7384 0920
Accace Adept UK
Accace Adept UK provides accounting outsourcing from its London presence, with services covering digitisation of accounting documents, purchase invoice management, bookkeeping, and connected financial workflows.
Its model may be particularly relevant to companies looking to move away from manual invoice administration. Accace Adept describes an approach in which accounting documents and workflows can be digitised while purchase invoices are incorporated into the client’s accounting environment. The UK operation is part of a broader international BPO and advisory network, which may also be relevant to businesses with finance requirements spanning multiple jurisdictions.
Key Facts
- Ideal for: Businesses digitising or outsourcing accounting workflows
- Core services: Purchase invoice management, accounting outsourcing, bookkeeping, workflow digitisation
- Specialization: Business process outsourcing and accounting
- Location: Mayfair, London
- Notable strength: Invoice administration within a wider BPO model
Contact Information
- Website: www.accace.co.uk
- Email: [email protected]
- Facebook: www.facebook.com/people/Accace-Adept/100083366079988
- Twitter: x.com/AccaceAdept
- LinkedIn: www.linkedin.com/company/accace-adept-united-kingdom
- Instagram: www.instagram.com/accace_adept
- Address: Berkeley Suite, 35 Berkeley Square, Mayfair, London W1J 5BF, United Kingdom
- Phone: +44 20 7692 8481
Manage Your Accounts
Manage Your Accounts provides virtual finance services from London, including a dedicated purchase ledger function. Its published service scope covers invoice processing, management of invoice approvals, preparation of payment lists, and payment processing.
Businesses can combine these tasks with bookkeeping, sales ledger administration, VAT returns, payroll, cash flow management, management reporting, and virtual finance director support. This makes the service relevant where invoice processing is one component of a broader plan to externalise routine finance operations rather than a standalone data-entry requirement.
Key Facts
- Ideal for: Businesses seeking a virtual finance team
- Core services: Invoice processing, purchase ledger, approvals, payment processing, bookkeeping
- Specialization: Outsourced finance operations
- Location: London
- Notable strength: Purchase and sales ledger work available within the same outsourced function
Contact Information
- Website: www.manageyouraccounts.co.uk
- Email: [email protected]
- Address: 86-90 Paul Street, London EC2A 4NE
- Phone: +44 20 33 00 00 08
Zapay
Zapay focuses specifically on accounts payable outsourcing for UK businesses and operates from central London. Its workflow covers receiving and checking invoices, coordinating approvals and supplier communication, preparing payments, and reporting on the status of accounts payable work.
The company positions its service around documented processing steps and visibility over outstanding approvals and exceptions. It can work alongside common finance platforms including Xero, QuickBooks, Sage, Dynamics 365, and NetSuite, which gives businesses scope to outsource processing without necessarily replacing the accounting system already used internally.
Key Facts
- Ideal for: Businesses specifically outsourcing accounts payable processes
- Core services: Invoice processing, approval coordination, supplier communication, payment preparation
- Specialization: Accounts payable outsourcing
- Software: Xero, QuickBooks, Sage, Dynamics 365, NetSuite
- Location: Central London
- Notable strength: Dedicated focus on AP workflows
Contact Information
- Website: zapayltd.com
- Email: [email protected]
- Address: International House, 50 Essex Street, London, WC2R 3JF
- Phone: 0203 951 4395
Coulman Scott Accountants
Coulman Scott Accountants provides bookkeeping support that includes processing purchase invoices and expenses as well as sales invoices, bank transactions, credit card transactions, and payroll journals.
Its bookkeeping packages can also cover purchase ledger reconciliations, supplier payment reports, accruals, prepayments, and financial reporting. The service therefore goes beyond simply transferring invoice information into accounting software. For businesses that need regular invoice processing together with reconciliation and reporting, these functions can be handled as part of the same bookkeeping arrangement.
Key Facts
- Ideal for: Businesses requiring invoice processing and conventional bookkeeping
- Core services: Purchase invoice processing, expenses, ledger reconciliation, supplier payment reporting
- Specialization: Outsourced and on-site bookkeeping
- Location: London
- Notable strength: Invoice processing connected with reconciliation and reporting
Contact Information
- Website: coulmanscott.co.uk
- Email: [email protected]
- Facebook: www.facebook.com/CoulmanScott
- Instagram: www.instagram.com/CoulmanScott
- Address: 20–22 Wenlock Road, London, England, N1 7GU
- Phone: 01223 789941
Cain & Co
Cain & Co provides London bookkeeping services covering both sides of the invoicing cycle. Its published bookkeeping scope includes raising and posting sales invoices, coding and posting supplier invoices, allocating supplier payments to the purchase ledger, processing bank payments, and completing bank reconciliations.
The firm also handles journals, accruals, prepayments, and fixed asset records. This service profile may suit businesses whose main requirement is dependable transaction processing but which also want the resulting bookkeeping records maintained through the period rather than handed back immediately after invoices are entered.
Key Facts
- Ideal for: Small businesses outsourcing transaction-level bookkeeping
- Core services: Supplier invoice posting, sales invoicing, purchase ledger, payment allocation, reconciliation
- Specialization: Bookkeeping and accounting
- Location: London
- Notable strength: Detailed transaction processing across purchase and sales ledgers
Contact Information
- Website: cainandco.co.uk
- Email: [email protected]
- Facebook: www.facebook.com/cainandcoUK
- Twitter: x.com/cainandcoUK
- LinkedIn: www.linkedin.com/company/cain-and-co-bookkeeping-services-limited
- Phone: 020 8087 1341
P&K Associates
P&K Associates provides bookkeeping services from locations in and around North London. Its purchase-side work includes purchase invoicing, checking purchase invoices, maintaining creditor listings, and purchase ledger administration.
The firm can also handle sales invoicing, debtor listings, allocations, debt collection, bank reconciliation, and VAT returns. Businesses can arrange bookkeeping at their own premises or through the firm’s offices, giving the service a more traditional outsourced accounting model than providers built entirely around remote processing.
Key Facts
- Ideal for: Smaller businesses seeking regular bookkeeping assistance
- Core services: Purchase invoicing, invoice checking, purchase ledger, creditor listings, reconciliation
- Specialization: General bookkeeping and ledger administration
- Location: Edgware, Harrow, and Barnet
- Notable strength: Purchase invoice checking alongside ledger maintenance
Contact Information
- Website: www.pandkgroup.co.uk
- Email: [email protected]
- Facebook: www.facebook.com/www.pandkgroup.co.uk
- Address: 10 Trevelyan Cres, Harrow, HA3 0RL; 1 Southfield, Barnet, EN5 2AS
- Phone: 020 8958 8883
Aztax Advisors
Aztax Advisors provides outsourced bookkeeping and virtual finance support from Ilford, serving businesses in East London. Its day-to-day bookkeeping covers sales invoices, purchase invoices, receipts, expenses, and bank payments.
For companies outsourcing more of the back office, Aztax also describes purchase ledger management that includes receiving, checking, and processing supplier invoices. Expense claims, sales ledger administration, document management, and finance-related correspondence can also be included. The firm works with Xero, QuickBooks, Sage, and FreeAgent.
Key Facts
- Ideal for: Small businesses and SMEs in East London
- Core services: Supplier invoice processing, purchase ledger, bookkeeping, expense processing
- Software: Xero, QuickBooks, Sage, FreeAgent
- Location: Ilford, East London
- Notable strength: Invoice administration available as part of wider back-office support
Contact Information
- Website: aztax.co.uk
- Email: [email protected]
- Facebook: www.facebook.com/people/Aztax-Advisors/61573410073184
- Twitter: x.com/Aztax_Advisors
- LinkedIn: www.linkedin.com/company/aztaxadvisors
- Instagram: www.instagram.com/aztaxadvisors
- Address: 859A High Road, Ilford, Essex, IG3 8TG
- Phone: 020 3372 4662
YMA Consultants
YMA Consultants offers bookkeeping services in London that cover the recording and management of sales and purchase invoices, bank transactions, accounts receivable, and accounts payable.
Supplier invoice processing can be combined with bank reconciliation, VAT record keeping, month-end procedures, management reporting, and customer payment follow-up. This broader scope may be useful for companies that initially want to outsource invoice processing but also need the bookkeeping records kept ready for VAT returns, year-end accounts, and management reporting.
Key Facts
- Ideal for: Businesses combining invoice processing with regular bookkeeping
- Core services: Supplier invoice processing, accounts payable, bank reconciliation, reporting
- Specialization: Bookkeeping and accounting support
- Location: London
- Notable strength: Transaction processing connected with month-end bookkeeping
Contact Information
- Website: www.ymaconsultants.co.uk
- Email: [email protected]
- Address: 419 B North End Road, London, SW6 1NY, UK
- Phone: +44 7502 373535
Wellden Turnbull
Wellden Turnbull provides outsourced accounting and bookkeeping services for businesses in London and Surrey. Purchase invoice processing is explicitly included in its bookkeeping offering alongside issuing and processing sales invoices.
The service can also incorporate bank reconciliation, VAT returns, payroll, and regular management accounts. Wellden Turnbull uses cloud accounting tools including Xero and Dext and can help clients set up Xero and train internal staff. This creates several possible delivery models, from outsourcing ongoing bookkeeping to establishing a cloud process that an internal team can subsequently operate.
Key Facts
- Ideal for: Businesses outsourcing bookkeeping or moving invoice processes to cloud accounting
- Core services: Purchase invoice processing, sales invoices, bank reconciliation, VAT, management accounts
- Software: Xero, Dext
- Location: London and Surrey service coverage
- Notable strength: Invoice processing combined with cloud accounting implementation support
Contact Information
- Website: www.wtca.co.uk
- Email: [email protected]
- Twitter: x.com/Accounts_london
- LinkedIn: www.linkedin.com/company/wellden-turnbull
- Address: 4th Floor, 49 St James’s Street, London, SW1A 1AH, UK
- Phone: +44 (0)20 7381 2022
Milsted Langdon
Milsted Langdon provides outsourced finance functions through offices that include London. Purchase ledger management forms part of a broader service covering bookkeeping, cash flow management, management information, VAT, payroll, and finance director support.
Its outsourcing approach also incorporates finance technology. The firm describes systems that allow clients to scan, review, and approve invoices and payment runs remotely, which can be useful where management wants processing work outsourced while retaining visibility and approval authority. Hybrid arrangements are also available for businesses that already have an internal accounting team but need additional capacity.
Key Facts
- Ideal for: Growing businesses outsourcing part or all of a finance function
- Core services: Purchase ledger, bookkeeping, payment workflows, cash flow management, VAT
- Specialization: Outsourced finance functions
- Location: London and other UK offices
- Notable strength: Ability to combine outsourced processing with an existing finance team
Contact Information
- Website: www.milstedlangdon.co.uk
- Email: [email protected]
- LinkedIn: www.linkedin.com/company/milsted-langdon-llp
- Instagram: www.instagram.com/milstedlangdon
- Address: Work.Life, 7 St Cross St, London EC1N 8UB, UK
- Phone: 0203 150 1113
BritTax
BritTax provides bookkeeping services from North London locations and bases its bookkeeping scope around transaction processing. Supplier invoices are included alongside customer invoices, bank transactions, and cash transactions.
The service also covers purchase ledger maintenance, recording supplier invoices and payments, supplier statement reconciliation, sales ledger maintenance, and bank reconciliation. This relatively conventional bookkeeping model may suit smaller businesses whose invoice outsourcing requirements centre on keeping supplier transactions accurately recorded and reconciled rather than implementing a separate enterprise accounts payable platform.
Key Facts
- Ideal for: Small businesses outsourcing routine bookkeeping and supplier records
- Core services: Supplier invoice processing, purchase ledger, supplier reconciliation, bank reconciliation
- Specialization: Transaction-based bookkeeping
- Location: North London
- Notable strength: Supplier invoice processing tied directly to purchase ledger reconciliation
Contact Information
- Website: brittax.co.uk
- Email: [email protected]
- Facebook: www.facebook.com/brittaxuk
- Address: Unit 53, Enfield Enterprise Centre, 26-28 Queensway, Enfield, EN3 4SA, UK
- Phone: 020 3633 7344
Capita
Capita is a UK business process outsourcing company providing technology-enabled operational and finance services to public and private sector organisations. Its finance capabilities include accounts payable, accounts receivable, payment processing, invoice matching, and purchase order controls.
For outsourced invoice processing, Capita combines back-office process management with automation to handle high-volume finance operations. Its work with the London Borough of Bexley included automated accounts payable processes and improvements to invoice workflows and purchase order compliance.
Key Facts
- Ideal for: Large organisations and public sector bodies
- Core services: Invoice processing, accounts payable, accounts receivable, payment processing
- Specialization: Finance process outsourcing and automation
- Location: London, UK
Contact Information
- Website: www.capita.com
- Facebook: www.facebook.com/Capitaplc
- Twitter: x.com/CapitaPlc
- LinkedIn: www.linkedin.com/company/capita
- Instagram: www.instagram.com/lifeatcapita
Conclusion
London businesses have several ways to outsource invoice processing. Some providers focus closely on purchase ledgers and accounts payable, including invoice capture, approvals, supplier reconciliations, and payment preparation. Others treat invoice processing as one part of a broader outsourced bookkeeping or virtual finance function.
There is no single provider that fits every finance team. The practical choice depends on invoice volume, approval complexity, accounting software, the level of supplier interaction required, and whether the business wants to outsource only transaction processing or a larger part of its finance operation.