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Terminal Tax Relief

Posted by Donald Findley 19 Jan 2026 at 13:45
Hello

Started using Tiny Tax and it seems great.

I want to claim "Terminal loss relief" to carry back losses from the final 12 months of trading, offsetting them against profits from the same trade in the three preceding tax years, reclaiming the tax and reducing the final tax burden when closing down.

I couldn't see though which box on the CT600 form I'd need to fill in to do this? I could see helpful guidance on taxing losses forward, but not profit back? Can you help please?

Many thanks!

2 Comments

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Tim Fouracre Staff 19 Jan 2026 at 18:46
Terminal loss relief is a specialist form of loss relief that allows companies to carry back losses from the final 12 months of trading to offset against profits from the previous 3 years - as you've correctly described.

This relief requires Box 45 on the CT600 and involves amending previously submitted returns to reclaim corporation tax already paid. It's quite a complex area of tax planning that falls outside the scope of what TinyTax currently handles - we focus on straightforward CT600 submissions for micro-entities with simple tax affairs.

I've made a note of this as a potential future feature, but given its complexity and the relatively small number of companies it affects, it's not something we're able to prioritise at the moment.
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Donald Findley 20 Jan 2026 at 15:28
Hi Tim, Many thanks for this. It is a small consultancy business, otherwise very straight forward. Really appreciate your swift response, and also the business model, where I didn't not have to pay upfront, only to find wasn't suitable. Shame its not for me, but will mention Tiny Tax to other and all the best for the future.