Odoo ERP implementation 19 works as a practice management system for UK accountancy firms by integrating CRM, project management, timesheets, invoicing and a client portal in one platform. It automates the timesheet-to-invoice cycle, chases debtors automatically, and files the firm's own VAT return via the HMRC Making Tax Digital API. Implementations start from £6,000 and sit alongside - not replacing - specialist tax software such as Iris, CCH or TaxCalc.
Odoo 19 is not an accounting system for your clients. It is the operational platform your firm uses to run itself: managing client relationships, tracking engagement delivery, capturing billable time and generating invoices. Your clients continue to use Xero, QuickBooks or Sage for their own books. Odoo sits alongside those systems as your practice management layer.
When accountancy practices contact us, the first question we hear is almost always: 'Is this our new accounting software?' The answer is no - and that distinction matters enormously. Odoo 19 is not the system your clients use to manage their own books. It is the system your firm uses to manage itself: your clients, your engagements, your time, your billing and your internal administration.
Odoo has over 12 million users worldwide across 100+ countries as of 2025. The platform is available in 2 deployment models: Odoo Online (cloud, from £7.25/user/month) and Odoo.sh (hosted cloud with customisation, from £26.90/user/month). Odoo Community edition is free and open-source under the LGPL licence. Odoo 17, released in October 2023, includes 16,000+ modules in the app store. UK implementation timeline benchmarks: accounting-only deployments average 4 weeks, full ERP with inventory and CRM averages 12 weeks, and manufacturing ERP averages 20 weeks. UK Odoo Enterprise pricing for the accounting module alone is £7.25/user/month, making it £870/year for a 10-user team - significantly cheaper than Sage 200 (£3,600/year minimum). HMRC's MTD VAT API has been integrated with Odoo since version 12 (2018) and handles over 50,000 UK VAT submissions annually. UK Odoo partners charge £600-900/day for implementation, with discovery workshops typically taking 3-5 days for a mid-market deployment.
At Softomate, we implement Odoo specifically for professional services firms in the UK, including accountancy practices. Our implementations start from £6,000 and are scoped around the real-world workflows of a UK practice: client onboarding, engagement management, timesheet capture, invoice generation and the debtor chasing cycle that every partner knows too well.
A well-scoped Odoo implementation for an accountancy firm draws on five core modules. You do not need to switch on every module in the platform. We configure only what drives value for your specific billing model and team size.
We are straightforward about this with every practice we work with. Odoo is not a replacement for specialist tax software. It will not prepare a self-assessment computation, produce a corporation tax return in CT600 format, or file accounts directly to Companies House via the XBRL route. For those workflows, your existing tools - whether Iris, CCH, TaxCalc or FreeAgent - remain in place. Odoo manages the commercial side of your practice; the specialist compliance tools manage the technical tax side. The two coexist, and we can configure lightweight integrations between them where it makes operational sense.
This is the honest positioning of Odoo for an accountancy firm. It replaces the collection of spreadsheets, Outlook folders and manual invoice runs that most small and mid-sized practices rely on today. It does not replace the compliance engine.
Time tracking in Odoo works through a mobile-first timesheet module where fee earners log hours directly against named client engagements. Approved timesheets automatically generate draft invoices at the configured hourly rate, removing the gap between work done and work billed that costs most practices 8-15% of recoverable revenue each quarter.
The moment a fee earner stops logging time on a spreadsheet and starts logging it against a named engagement in Odoo, three things happen: the data becomes reliable, it becomes available to the billing team in real time, and it stops disappearing into email threads and forgotten notes.
In Odoo 19, the flow is linear and requires minimal manual intervention once configured correctly. A fee earner opens the Timesheets app and logs hours against a task within a client project. The task carries a billing policy: either billable at a specific rate, non-billable, or billable at a milestone. When the partner or billing manager reviews the week's timesheets and marks them as approved, those hours are immediately available to generate an invoice. The accounting module pulls the approved timesheet lines, applies the hourly rate set on the engagement, and produces a draft invoice that the billing manager reviews before sending. The client receives the invoice by email and can view it in their portal. When payment arrives, Odoo reconciles it against the invoice automatically.
UK accountancy firms operate across three main billing models, and Odoo handles all three. The table below sets out how each model maps to Odoo configuration and how UK VAT is treated in each case.
| Billing model | When used in accountancy | Odoo configuration | UK VAT handling |
|---|---|---|---|
| Time and materials | Ad-hoc advisory work, bookkeeping bureau charged by hour, tax queries billed per hour | Project billing policy set to 'Timesheets'. Hourly rate set per employee or per project. Invoices generated from approved timesheets. Partner review before sending. | Standard rate (20%) applied to invoice lines. Odoo tax mapping handles the correct VAT code. Exempt supplies (some financial services) can be configured per service type. |
| Fixed fee | Annual accounts preparation, self-assessment, payroll bureau at fixed monthly rate, company secretarial | Project billing policy set to 'Fixed Price'. Invoice milestone set at project start or completion. Timesheets logged for WIP tracking and profitability reporting but do not drive invoice value. | Fixed-fee invoice raised with correct VAT rate. If engagement spans a VAT quarter, partial invoices can be raised at milestone. VAT point rules apply on invoice date by default. |
| Retainer (subscription) | Monthly retained clients for ongoing bookkeeping, payroll, management accounts or outsourced FD services | Odoo Subscriptions module (or recurring invoice template in Accounting). Invoice auto-generated monthly on a set date. Direct debit integration via GoCardless possible with third-party connector. | Standard rate applied to each recurring invoice. If retainer includes both standard-rated and exempt elements, tax must be split correctly per line. We configure this during implementation. |
Work-in-progress (WIP) leakage is one of the biggest margin problems in small practices. Time spent on client work that never gets billed - because it was not logged, was logged incorrectly, or was written off without the partner seeing it - represents real lost revenue. Odoo's mobile app (iOS and Android) includes a timer function. A fee earner can start a timer when they pick up the phone to a client and stop it when they hang up. The time entry is saved against the correct project. This alone recovers meaningful revenue in practices that move from spreadsheet-based time recording to Odoo.
We typically see UK practices recover 8-15% of previously unlogged billable time in the first quarter after going live with Odoo timesheets. That translates directly to revenue that was already being earned but never invoiced.
After implementing Odoo for professional services firms in the UK, the pattern is consistent: practices recover significant unbilled revenue in the first 90 days, but underestimate the change management required to shift staff from spreadsheets to daily timesheet discipline. The technology works. The habit change is the project.
The specific numbers from our UK accountancy implementations: practices with five to fifteen fee earners typically recover £12,000-£35,000 in previously unlogged or under-billed time in the first year. A ten-person practice billing at an average of £120 per hour, with each fee earner logging just one additional 30-minute billable task per day that previously went unrecorded, generates approximately £31,200 in recovered revenue annually. That is the scale of the WIP leakage problem in a typical practice, and it is why timesheet discipline is the first conversation we have with any firm we implement Odoo for.
Where Odoo does not deliver as expected: practices that run complex tax computation workflows and expect Odoo to reduce their Iris or CCH licence costs immediately are usually disappointed in the first six months. The compliance tools stay. What changes is everything around them - the client onboarding process, the billing run, the debtor chasing cycle and the management reporting. Those are the areas where Odoo replaces manual effort with automated workflows. The return on investment is real, but it comes from operational efficiency, not licence displacement.
The implementations that fail are the ones where no partner champions the project internally. Odoo requires consistent timesheet input from every fee earner. If senior staff do not log time, junior staff follow their lead. We now make partner buy-in a prerequisite of any implementation we take on. It is not a technical requirement - it is an operational one.
Odoo automates the invoicing cycle by generating draft invoices from approved timesheets, sending them on a configured schedule, and triggering a graduated reminder sequence for unpaid invoices at 7, 14 and 21 days - all without manual intervention from the billing team. Partners step in only for the clients who genuinely need a conversation.
Chasing debtors is one of the most time-consuming and relationship-sensitive tasks in any accountancy practice. Partners do not enjoy calling clients about unpaid invoices. Junior staff often do not feel empowered to do it firmly enough. The result is an aged debtor book that grows quietly until the partners review it quarterly and wince.
When we configure Odoo for a UK practice, we set up a follow-up sequence that works as follows. An invoice is sent on the due date. If unpaid after seven days, Odoo sends a polite reminder automatically by email. If still unpaid after fourteen days, a firmer reminder goes out. After twenty-one days, the system flags the client for a personal call by the billing manager. This sequence is fully configurable - we set the exact wording, timing and escalation rules to match the culture and client relationships of the firm. The system does the repetitive work; the partner steps in only for the clients who genuinely need a conversation.
The aged debtor report in Odoo shows outstanding invoices grouped by how long they have been outstanding: current, 30 days, 60 days, 90 days and over 90 days. This report is available in real time from the accounting dashboard. There is no waiting for month-end to understand what is owed to the practice. Partners can see their own client debtors filtered by engagement type or responsible staff member.
Every client set up in Odoo can receive a portal invitation. When they log in, they see their own invoices, outstanding balance and payment history. They can download a PDF of any invoice. This self-service function reduces the volume of routine queries coming into your practice and accelerates payment: clients who can see a clear, professionally presented invoice in a portal tend to pay faster than clients who have to email to request a copy.
Odoo connects to UK bank accounts via open banking feeds (through compatible aggregators). Incoming payments are matched automatically to outstanding invoices where the reference and amount align. Partial payments, payment on account and client credits are all handled. The bookkeeper's job moves from manually matching payments to reviewing the exceptions that the system could not match automatically.
A critical point for accountancy firms: Odoo 19 submits your firm's own VAT return directly to HMRC via the Making Tax Digital API. This is not a workaround or a bridge tool - it is a direct connection from Odoo's accounting module to HMRC's MTD for VAT API. Your practice's quarterly VAT return is prepared from your Odoo transactions and submitted with a single confirmation. The submission record is stored in Odoo for audit purposes.
This is particularly relevant for practices that are currently using a separate piece of software just for their own MTD VAT submission. Odoo eliminates that duplication. For more detail on how MTD works in the context of UK business software, the GOV.UK guidance on Making Tax Digital for VAT sets out the HMRC requirements that Odoo 19 meets.
Odoo provides four categories of practice management reporting in real time: client profitability per engagement (hours logged versus invoiced value), WIP (unbilled time as a cash flow indicator), fee earner utilisation (billable versus non-billable time ratios), and revenue by service line - all drawn from the same timesheet and invoice data without requiring a separate reporting tool.
Most small practices run on a combination of intuition, ad-hoc spreadsheet pulls and quarterly management accounts that arrive six weeks after the period they cover. Odoo gives partners live data on the metrics that actually drive practice performance.
Because Odoo links timesheets to engagements and invoices, it can report the profit on each client engagement in real time. You see the hours logged, the hourly cost of the fee earners involved (based on the staff cost rate you set), the invoiced value and the gross margin. You can run this report across all engagements for a given period or drill down to a specific client. This is the data that tells you which clients are genuinely profitable and which ones are consuming margin through scope creep, excessive revisions or under-priced fixed fees.
The WIP report shows the value of time logged on active engagements that has not yet been invoiced. This is the single most important cash flow indicator for a time-based practice. If WIP is rising without corresponding invoice generation, either billing is falling behind or engagements are over-running. Odoo surfaces this immediately rather than letting it accumulate silently until a partner review.
Partners can see revenue contribution broken down by fee earner and by service type (audit, tax compliance, bookkeeping, payroll, advisory). This is the data needed to manage capacity, set fee targets and make informed decisions about which service lines to grow. It is also the foundation for any performance-related pay structure based on billed revenue.
The timesheets module feeds a utilisation report that shows what percentage of each fee earner's logged time is billable versus non-billable. Low utilisation rates flag either capacity issues, excessive non-chargeable work or time that is not being logged. For practices managing a team, this report is the operational heartbeat that replaces the uncomfortable weekly 'where did the time go?' conversation with data.
Odoo can be configured to send scheduled reports by email - weekly WIP summaries, monthly debtor snapshots, or a quarterly profitability review - directly to partners' inboxes. This means practice management data reaches decision-makers without them needing to log in and run reports themselves.
For a broader look at the technology landscape for UK practices, the ICAEW guidance on practice technology is a useful reference point for firms evaluating their software stack. The Odoo accounting module documentation covers the technical detail on reporting configuration.
Odoo is stronger than Iris, CCH and TaxCalc on CRM, client portal and cross-module integration at its price point. Dedicated accountancy software wins on tax computation, XBRL accounts production and Companies House bulk filing. The right answer for most UK practices with five to fifty staff is Odoo for practice management alongside retained specialist compliance software - not a full replacement.
The table below sets out an honest comparison across the features that matter most to a UK accountancy practice. Pricing figures are indicative as of May 2026 - always confirm current pricing directly with vendors.
| Feature | Odoo 19 | Iris | CCH (Wolters Kluwer) | TaxCalc | Notes |
|---|---|---|---|---|---|
| Practice management | Strong. CRM, project, timesheets, billing fully integrated in one platform. | Strong. Purpose-built for accountancy. Deep Companies House integration. | Strong. Enterprise-grade. Best for larger practices. | Moderate. Good for sole traders and small practices. Less workflow depth. | Odoo wins on CRM integration and client pipeline visibility. Iris/CCH win on Companies House bulk workflows. |
| Time tracking | Strong. Mobile app, real-time WIP, billable/non-billable flags. Profitability reporting per engagement. | Strong. Purpose-built for accountancy timesheets. Integrates with Iris billing. | Strong. Integrated timesheet and billing within the CCH suite. | Basic. Not a core strength of TaxCalc. | Odoo is competitive here. Mobile capture is particularly good. |
| Client billing | Strong. All three billing models. Automated reminders. Portal access for clients. | Strong. Fixed-fee and T&M billing. Integrated with Iris accounts production. | Strong. Sophisticated billing workflows for larger practices. | Basic. Invoice generation present but limited automation. | Odoo's automated reminder cycle is a genuine differentiator for small practices. |
| MTD VAT filing | Yes. Direct HMRC API connection for the firm's own VAT return in Odoo 19. | Yes. Via Iris VAT filer or bridging software. | Yes. CCH OneClick includes MTD VAT submission. | Yes. TaxCalc includes MTD VAT filing. A core strength. | All four handle MTD VAT. Odoo handles the firm's own VAT only; it does not handle clients' VAT returns filed on their behalf. |
| Client portal | Yes. Clients view invoices, balances and documents. Configurable access levels. | Limited. Client-facing portal depends on which Iris product bundle is in use. | Yes. CCH Client Portal available as add-on. | No dedicated client portal. | Odoo's included client portal is a practical differentiator for practices wanting to reduce routine invoice queries. |
| CRM | Strong. Full CRM with pipeline, lead tracking, email integration, automated follow-ups. | Basic. Contact management present. Not a full CRM. | Basic. Client records strong; pipeline management limited. | Minimal. Contact list only. | If business development and client pipeline matter to the practice, Odoo has a clear advantage. |
| Tax computation | Not available. Odoo does not prepare self-assessment, CT600 or corporation tax computations. | Strong. Iris Personal Tax, Corporation Tax. Core product strength. | Strong. CCH Personal Tax and Corporation Tax are market-leading. | Strong. TaxCalc tax computation is its primary strength. Excellent value. | This is the critical gap for Odoo. Tax compliance software remains essential alongside Odoo for any practice doing compliance work. |
| Companies House filing | Limited. Companies House API available for confirmation statement data. No bulk XBRL accounts filing. | Strong. Iris accounts production includes direct Companies House and HMRC filing. | Strong. CCH accounts production includes direct filing. | Yes. TaxCalc includes accounts production and Companies House filing. | Practices filing many sets of statutory accounts need Iris, CCH or TaxCalc for this workflow. Odoo does not replace it. |
| Price per user per month | From approximately £25-35/user/month for required modules (Enterprise). Plus implementation from £6,000. | Typically £50-150+/user/month depending on modules. Contact Iris for current pricing. | Typically £80-200+/user/month for full suite. Enterprise pricing. Contact Wolters Kluwer. | From approximately £350-600/year per user depending on modules. Competitive for tax-only use. | Odoo's total cost of ownership is typically lower for small to mid-sized practices when the full suite replaces multiple point solutions. |
For a typical accountancy practice with five to twenty fee earners, the most practical outcome of this comparison is not 'replace everything with Odoo'. It is 'use Odoo for practice management, billing and CRM, and retain your specialist tax software for compliance workflows'. This hybrid approach is what we design and implement at Softomate. The two systems share a client record. Time tracked in Odoo feeds billing in Odoo. Tax work remains in the specialist tool. The practice stops managing three separate billing spreadsheets and a separate CRM while gaining real-time WIP and profitability data it has never had before.
If you want to understand more about the broader scope of business process automation in professional services, our guide on business process automation for UK accountancy practices covers the eight workflows where automation delivers the clearest return.
Odoo can replace Iris or CCH for practice management, billing, time tracking and CRM. It cannot replace them for tax computation, statutory accounts production or bulk Companies House filing via XBRL. Most practices we implement Odoo for retain their specialist tax software for compliance workflows and use Odoo as the commercial and operational layer. This hybrid approach is the right answer for the majority of UK accountancy firms with five to fifty staff.
Odoo can integrate with Xero via the Xero API or third-party connectors available through the Odoo app store. The key distinction is that Odoo is your practice management system - your clients continue to use Xero, QuickBooks or Sage for their own bookkeeping. If you need specific data flows between Odoo and a client's Xero instance, we scope and configure that during implementation. The integration is practical but should be designed carefully to avoid unnecessary complexity.
Yes. Odoo includes a client portal that you can activate for any client. When a client logs in, they see all invoices issued to them, their outstanding balance and payment history, and can download PDF copies of any invoice. This self-service capability reduces routine invoice queries and tends to accelerate payment. You control which clients receive portal access and what level of detail they can see.
Odoo 19 connects directly to the HMRC Making Tax Digital API and submits your practice's own VAT return from within the accounting module. The VAT return is prepared from your Odoo transactions, reviewed within the system, and submitted to HMRC with a single confirmation. This covers your firm's own VAT obligation only. Odoo does not file VAT returns on behalf of your clients - that workflow requires specialist software and agent authorisation credentials with HMRC.
Our Odoo implementations for UK accountancy firms start from £6,000. This covers scoping and discovery, module configuration (CRM, Project, Timesheets, Accounting, Client Portal), data migration from your existing systems, team training and a 30-day post-go-live support period. The final cost depends on user count, billing workflow complexity and any custom integrations required. We provide a fixed-price proposal after an initial scoping call. You can also read more about typical Odoo implementation costs for UK businesses in our detailed breakdown.
Odoo 19 gives UK accountancy practices a practice management platform that connects client relationships, engagement delivery, time capture and billing in a single system. Implementations start from £6,000, cover CRM, Project, Timesheets, Accounting and Client Portal, and deliver the greatest return on investment in the first 90 days through recovered WIP and reduced debtor days. The firms that gain most are those with five to twenty fee earners where manual billing processes and spreadsheet-based time recording are creating the biggest operational drag. Specialist tax and compliance software stays in place alongside Odoo - the two systems serve different purposes and work better together than either does alone.
We implement Odoo for UK accountancy and professional services firms from our base in Barking, East London. Contact the Softomate team to discuss your practice's requirements and receive a fixed-price implementation proposal.
Odoo implementation for a UK SME typically takes 4-6 weeks for accounting only, 8-14 weeks for CRM and inventory, and 16-24 weeks for full ERP including manufacturing. The timeline depends on data migration complexity and internal team availability. UK-specific requirements (MTD VAT, payroll RTI) add 1-2 weeks to any implementation scope.
Yes. Odoo Enterprise includes full Making Tax Digital (MTD) for VAT compliance - the software connects directly to HMRC's API for VAT return submission. This has been available since Odoo 12 and was updated for UK-only MTD rules post-Brexit. MTD for Income Tax Self Assessment (ITSA) support is included in Odoo 17 for businesses above the £50,000 income threshold from April 2026.
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