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CT600 form

Posted by David Fennell 13 Dec 2025 at 21:24
Hi Tiny Tax,
I've generated the corporation tax computations calcs but when I go to review the CT600 it only has the turnover and loss brought forward information and no information has been included for the expenses or the annual investment allowance deduction. I would of thought that this would need to be included in the CT600 form?

Please can you advise?

Thanks,

4 Comments

T
Tim Fouracre Staff 13 Dec 2025 at 21:46
On the CT600 preview page, click the "Show All Boxes" button at the top - this will reveal all the detail including your expenses and Annual Investment Allowance deduction.

By default we show a condensed view with just the key figures, but all your data is there.

Let me know if you have any other questions.
D
David Fennell 13 Dec 2025 at 21:56
Hi Tim,

Thanks for your response. I don't see an a show all boxes on the actual CT600 form? I only have the option to view it in PDF.

In the corporation tax computation there is a mapping number that corresponds to the CT600 form. I can see the mapping 145 or turnover and 155 for trading profits but the expenses and AIA has no mapping in it? So thats probably why I cannot see it on the HMRC CT600 form? Is this something I need to manually map?

Thanks,
T
Tim Fouracre Staff 14 Dec 2025 at 08:58
Thank you for getting in touch about your CT600 for ELECTRON DF LIMITED.

You're absolutely right - the Annual Investment Allowance wasn't appearing on the CT600 PDF. This was a display issue on our end; your data was saved correctly but the AIA field (Box 735) wasn't being populated on the PDF.

I've now fixed this and regenerated your CT600 PDF. If you download it again from TinyTax, you'll see:

Box 735 (Annual Investment Allowance): £29,650 Box 780 (Losses carried forward): £7,588

Just to clarify - the CT600 PDF is purely for your records. Your return is actually filed digitally with HMRC via XML, and all the correct values (including your AIA) are included in that submission. The PDF is simply a presentational copy to help you see what was filed.

The calculations are correct - your AIA of £29,650 exceeds your accounting profit of £13,987, resulting in a trading loss for the period. This loss (£7,588 after adjustments) is available to carry forward to future periods.

Please let me know if you have any questions or if anything else looks off.
D
David Fennell 14 Dec 2025 at 21:25
Great thanks so much!