ONESOURCE Corporate Tax Implementation
ONESOURCE Corporate Tax (OCT) implementation for UK and international compliance - replacing manual spreadsheets with structured, repeatable, automated workflows.
ONESOURCE Corporate Tax automates the preparation, review, and approval of corporation tax returns. Implemented well, it removes the spreadsheet risk from your compliance cycle and frees the team to focus on higher-value work - implemented poorly, it just digitises the same manual process.
We build OCT around how your group actually works: return preparation templates tailored to your structure, data feeds configured directly from your ERP, and a review and approval workflow that reflects your controls. The result is a faster compliance cycle, fewer errors, and a process the team can run with confidence.
We implement OCT as a standalone solution or alongside ONESOURCE Tax Provision and Statutory Reporting, so data flows between them without manual rekeying.
An indicative six-week implementation
- Week 1 Project launch & kick-off
- Weeks 1-2 Model template design
- Week 2 System configuration
- Weeks 3-4 Template build & trial balance mapping
- Week 4 Test
- Week 5 Client testing & acceptance
- Week 6 Template delivery
An indicative six-week timeline; we agree a detailed plan at kick-off. Project management runs throughout.
Frequently asked questions
How long does an OCT implementation take?
An indicative ONESOURCE Corporate Tax implementation runs about six weeks, from kick-off through to template delivery. The exact timeline depends on your group structure and data, and we agree a detailed plan at kick-off.
How is it priced?
Pricing depends on scope - the number of entities, jurisdictions, and complexity. After a short scoping conversation we give you a clear quote, with no padding and no surprises.
Can you help us bring corporation tax compliance in-house?
Yes - bringing compliance in-house, often from an outsourced provider, is a common reason groups implement OCT. We set up the templates, data feeds, and process so your team can run it with confidence.
Can OCT handle international as well as UK corporation tax?
Yes. We configure UK CT computations and support international corporation tax requirements across the group.
How does OCT connect to our finance systems?
Through automated data feeds from your ERP and ledger systems - via API, file-based imports, or Alteryx workflows where transformation is needed.
Can OCT and ONESOURCE Tax Provision share data?
Yes. We integrate the two so data flows between corporate tax and provision without manual rekeying.
What about Making Tax Digital for Corporation Tax?
HMRC has not yet set out a timetable for Making Tax Digital for Corporation Tax, but we think it is a matter of time. A structured, software-based corporate tax process puts you in a strong position whenever it arrives.
Will this reduce our compliance-season workload?
That is the goal. Templated computations and automated feeds remove repetitive manual steps, so each cycle is faster and lower-risk than the last.
What do you need from our team?
A nominated point of contact, access to the relevant systems and data, and time for your team to make the key decisions and to test and sign off. We will also need your help with the mapping - matching your own data to the templates - as that is where your knowledge of your numbers matters most.
Do you provide support after go-live?
Yes - every implementation includes a hyper-care period after go-live, plus ongoing support and enhancements beyond that.
Who will we actually work with?
Directly with Mark and Charlotte throughout - no account managers and no junior handoffs. The people who scope the work are the people who deliver it.
Do you work remotely or on-site?
We work remotely. It keeps engagements efficient and cost-effective, and means we can support groups wherever they are based.
How are you different from a Big 4 firm?
Big 4-level expertise, delivered directly by the founders - without the overheads, layers, and handoffs. That makes it faster, more personal, and more cost-effective.
Considering ONESOURCE Corporate Tax?
Let's have a straightforward conversation about your situation - no lengthy proposal, no hard sell.