Free tool

What will the company owe?

Most founders have no idea until someone tells them. This walks your accounting profit through the tax adjustments, applies the exemption you actually qualify for — and explains why — then shows the ECI figure and the deadline it feeds.

Free to use — just say where to reach you.

Enter your email and the calculator opens right here. No sign-up, no password, and nothing is sent to your inbox — we simply like knowing who finds these useful.

Every figure is an estimate on current published rates — not a filed position and not tax advice. COAT subscribers see this pre-filled from their own books. Check this with us before you rely on it.