ONESOURCE Tax Provision Implementation
End-to-end ONESOURCE Tax Provision (OTP) implementation for multinational group tax teams - delivered directly by specialists who have configured the platform at scale.
ONESOURCE Tax Provision is the market-leading platform for group tax provision and reporting, built to streamline the financial close - calculating the group's tax provision quickly and giving the team confidence in the numbers. A successful OTP implementation is far more than installing software - it is about mapping your data correctly, configuring the right tax logic, and building a process your team can actually own. That is where implementations succeed or fail.
Osprey Consulting is led by Mark Hart, former Director of Solution Consulting at Thomson Reuters, where he oversaw the consulting team for the ONESOURCE platform. You work directly with that expertise - no layers, no junior hand-offs - from initial scoping through configuration, data integration, testing, and go-live.
We implement OTP for groups bringing provision in-house for the first time, and we re-engineer existing configurations that have drifted from good practice or were never set up to fit the group properly.
A typical 12-week implementation
- Week 1 Project launch & kick-off
- Weeks 1-2 Information request
- Weeks 2-3 Requirements & design
- Weeks 3-8 Build & test
- Weeks 9-11 Client testing & acceptance
- Weeks 11-12 Final walkthrough & amendments
- Week 12 Go-live
A typical 12-week timeline; we agree a detailed plan at kick-off. Build and test can include optional global access, integrations, and APIs. Project management runs throughout.
Frequently asked questions
How long does an OTP implementation take?
A typical OTP implementation runs about 12 weeks from kick-off to go-live. The exact timeline varies with the number of entities, your data sources, and complexity, 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.
What information do you need to get started?
Broadly, the same information you already use in your current workbooks. We kick off every project with a clear information request so you will know exactly what is needed - and if you would like to discuss it in advance, just get in touch.
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 do the heavy lifting; your input matters most at the design and review points.
Can you integrate OTP with our ERP and consolidation system?
Yes - via API, file-based feeds, or Alteryx workflows, depending on your systems.
Do we need to replace our existing systems?
No. OTP integrates with your ERP and consolidation systems via API, file-based feeds, or Alteryx. We work with the systems you already have.
Can you help if our existing OTP setup is no longer keeping up with our business?
Yes - we focus primarily on new implementations, but that experience puts us in a strong position to help where a setup has drifted from good practice or has not kept pace with how your business has changed. We review what you have, reconfigure what needs it, and leave your team confident to run it.
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 Tax Provision?
Let's have a straightforward conversation about your situation - no lengthy proposal, no hard sell.