White-label CT1 outsourcing built around how Irish accounting practices actually work.
CT1 season catches a lot of firms off guard — not because the work is unfamiliar, but because of the sheer volume of it. Between reconciling accounting profit with taxable profit, working through capital allowances, applying the right Finance Act reliefs, and keeping up with whatever Revenue has changed recently, the hours add up fast.
And the problem isn't really the complexity. It's doing all of it, repeatedly, across dozens of clients, while deadlines are stacking up and your senior people are already stretched thin.
That's the situation most Irish accounting firms find themselves in at some point. More corporate clients means more CT1 returns, and at a certain point your internal tax team simply can't absorb it all without something slipping.
We work with Irish accounting and tax practices to take that pressure off. At Aone Outsourcing Solutions, our team handles CT1 preparation — calculations, schedules, the full return — and delivers everything ready for your partner to review. Your name goes on it. Ours doesn't.
Before anything else, we get the taxable profit figure right. That means going line by line through the accounts, separating allowable deductions from non-deductible expenses, and applying the correct revenue adjustments. It's detailed work, but it has to be done properly or everything downstream is off.
Writing-down allowances, disposals, qualifying asset classifications, amounts carried forward β we track all of it across your client base, not just for the current period.
R&D tax credits, close company surcharges, deferred tax, capital gains β these take time and careful handling. We work through them thoroughly so your team isn't left second-guessing the numbers at review.
We complete the entire Form CT1 with supporting computations, structured for straightforward partner sign-off and electronic filing through ROS.
Every CT1 we prepare follows the same process, which means fewer errors and more predictable turnaround times for your team.
We don't just send a completed return. Every file comes with reconciliations and support schedules so your partner can follow the logic without having to dig for it.
Your branding throughout. Your client has no idea the work was outsourced, which is how it should be.
Five returns this month, forty next month β we adjust. You're not locked into a fixed arrangement that doesn't match your actual filing calendar.
Finance Act changes, Revenue guidance updates, corporate tax compliance requirements β our team stays current so your returns don't fall behind.
The area of our team is the legislation of Irish Corporation Tax, the Revenue practice, and the updates of the Finance Act.
There's no complicated onboarding. Here's how it typically goes:
We examine your client file, difficulties, documentation policies, and filing dates.
Access is encrypted, and data protection and confidentiality standards are fully met.
Calculations of Corporation Tax are calculated in accordance with the Irish tax law and Revenue guidelines.
The CT1 returns are checked and checked in structure prior to delivery.
Your team reviews the return, provides feedback where necessary, and approves it for filing.
We support with Revenue questions, amendments, and further filing.
Professional Services
Real Estate & Property Management
E-commerce & Retail
Healthcare & Medical Practices
Technology & SaaS
Manufacturing & Wholesale
Logistics & Transportation
Startups & Growing Businesses
Aone is our go-to for complex CT1 cases involving group relief and trading losses. Their calculations are accurate and ready for Revenue.
Outsourcing CT1 preparation has freed our senior tax professionals to focus on advisory work without sacrificing quality.
Their process has improved the consistency of our CT1 filings and made internal reviews a lot smoother.
Yes. Our corporation tax and CT1 services are exclusively outsourced Irish accounting and tax practices.
Yes. Computations and CT1 returns are done under your firm's brand and in complete privacy.
Yes. We handle group relief claims, utilisation of trading losses, R&D tax credits, capital allowances and other technically complex issues regularly.
Pricing will be determined based on the volume of returns, complexity, and turnaround requirements. A tailor-made quote is available on contact.
Yes, this service is built specifically for Irish accounting and tax practices. We're not a generic outsourcing provider.
Yes β group relief, trading losses, R&D tax credits, capital allowances. These come up regularly and we're comfortable with all of it.
Outsourcing corporation tax preparation helps accounting firms manage workload, improve turnaround time, and access experienced tax professionals without expanding internal teams.
Let us take care of your books and make this financial year a good one.
AoneOutsourcing
After giving opportunities to numerous providers, the experience of working with Aone was overwhelming. Highly recommended.