UK trades

Enter on the Details tab information about the trade such as its name and commencement date. If the trade has ceased, then enter the cessation date here also.

You cannot enter figures of the profit or loss here. These should instead be entered at Profit and Loss. You should, however, enter here details of prior year adjustments, other adjustments and losses brought forward.

Summarises the capital allowance claims made in respect of this trade.

With the exception of claims in respect of certain cars, no figures are entered on this tab. You should instead make all capital allowance claims from the Fixed asset register. Select the relevant linked amount on the Capital allowances tab to go to that capital allowances page where you can amend AIA claims or disclaim WDAs and/or FYAs. Any capital allowances details entered in the Fixed asset register which relate to this trade and changes made in each capital allowances page will be reflected in the Capital allowances tab.

The Losses tab has three subtabs (Losses This Period, Losses b/f and Losses b/b) and each shows the amount of the loss for the respective loss type for this trade.

Use the subtabs to show how the respective loss types should be used.

Losses This Period

Enter in the relevant box the amount of losses:

• foregone
• relieved in the current period
• surrendered as group relief
• relieved in the previous period
• relieved in periods prior to the previous period

• relieved in periods prior to the previous period under the temporary extension rules in FA 2021, s18 and Schedule 2

• relieved under the terminal loss relief rules

• relieved under the terminal loss relief for carried forward losses rules

• surrendered for R&D tax relief under the SMEs scheme or the R&D-intensive SME scheme

  Note:

  To enter losses in Group relief surrendered, there must be at least one associated company (or one 51% group company during periods between 1 April 2015 and 31 March 2023) excluding this company entered at Return information.

  If the company is a loss-making R&D-intensive SME, check R&D intensity condition met. in accounting periods starting on or after 1 April 2024. R&D intensity condition met is enabled if Total available exceeds zero and Total R&D expenditure incurred by R&D-intensive SME / R&D expenditure incurred by R&D-intensive SME on the R&D Claims tab exceeds zero.

Losses b/f

Enter in the relevant box the amount of losses:

• foregone or no longer available

• transferred in and available for relief

• surrendered as group relief

• relieved against interest and dividends treated as trade profits

• surplus qualifying charitable donations and any surrendered as group relief

• transferred out

• extinguished on cessation

  Note:

  To enter losses in Less: Qualifying charitable donations surrendered as group relief, there must be at least one associated company (or one 51% group company during periods between 1 April 2015 and 31 March 2023) excluding this company entered at Return information.

  If the company is a loss-making R&D-intensive SME, check R&D intensity condition met. in accounting periods starting on or after 1 April 2024. R&D intensity condition met is enabled if Total available exceeds zero and Total R&D expenditure incurred by R&D-intensive SME / R&D expenditure incurred by R&D-intensive SME on the R&D Claims tab exceeds zero.

Losses b/f and Losses c/f have to be analysed between those arising before 1 April 2017 and those arising after 31 March 2017.

Any losses not specifically allocated in the above boxes will be carried forward to the next period. Carried forward losses do not show on the Losses summary, as you do not have to make an election in their respect.

Losses b/b

Enter in the relevant box the amount of losses:

• brought back

• brought back under the temporary extension rules in FA 2021, s18 and Schedule 2

• brought back under the terminal loss relief rules including relief for carried forward losses

The Losses b/b subtab requires the AP end date of the AP from which losses have been brought back to be entered. Where trade losses are brought back from more than one UK trade, the respective date entered in each of those UK trade's Losses b/b subtab must be the same for all UK trades. The date entered populates the equivalent date in the Tax computation.

The information entered here will help to populate Losses summary, which reports the loss claim elections.

This summarises all R&D claims made in the period for this trade. The entries are used to complete the relevant boxes of the CT600 and CT600L.

Claim notification and additional information

This section is for reporting that:

• a claim notification form has been submitted
• an additional information form has been submitted

If a checkbox is ticked, the equivalent CT600 box will be populated.

These are digital forms which are available from .GOV.UK.

See Tell HMRC that you’re planning to claim Research and Development (R&D) tax relief by making a claim notification by making a claim notification for guidance including if and when a claim notification form must be submitted.

See Submit information to support your claim for R&D Corporation Tax reliefs for guidance about the additional information form including when it must be submitted.

SME R&D enhanced relief or R&D enhanced relief: R&D-intensive SME

This section summarises all R&D claims where the R&D claim type is Enhanced relief - incurred by SME or, for accounting periods starting on or after 1 April 2024, Enhanced relief - incurred by R&D-intensive SME. For accounting periods starting on or after 1 April 2021, you will need to enter the following details:

Exception to tax credit cap applies or Exception to R&D PAYE/NICs cap for R&D-intensive SMEs applies.

This must be checked if the exception applies (meaning the cap does not apply) (see CTA 2009, s1112E). If you check this box, or leave it unchecked, you will need to enter other data, as explained below.

Total expenditure on externally provided workers

You must enter an amount here if Exception to tax credit cap applies or Exception to R&D PAYE/NICs cap for R&D-intensive SMEs applies is checked. Use the help tip for guidance on what to enter here. The amount entered cannot exceed 15% of R&D expenditure incurred by SME or R&D expenditure incurred by R&D-intensive SME (see CTA 2009, s1112E(5)).

PAYE and NICs for which company is liable this period.

You must enter an amount here if Exception to tax credit cap applies or Exception to R&D PAYE/NICs cap for R&D-intensive SMEs applies is unchecked (see CTA 2009, ss1112C and 1112D).

Number of employer PAYE references added.

If you have completed PAYE and NICs for which company is liable this period, you must include the employer PAYE reference(s). Click the linked value to open the Employer PAYE reference(s): This company pop-up. In the pop-up, click Add and enter the PAYE reference in the row that appears. You can add a maximum of two employer PAYE references, e.g. the main PAYE reference and any separate PAYE reference for directors etc., and you must include both PAYE references if there are two.

Relevant PAYE and NICs liability of connected companies.

If the company has any connected companies, you must enter the total PAYE and NICs liability of all the connected companies (see CTA 2009, ss1112C and 1112D).

Number of employer PAYE references of connected companies added.

If you have completed Relevant PAYE and NICs liability of connected companies, you must include the PAYE reference(s) for each connected company. Click the linked value to open the Employer PAYE reference(s): Connected companies pop-up. In the pop-up, click Add and enter the PAYE reference in the row that appears. Each connected company may have more than one PAYE reference. You can add a maximum of 15 connected companies' PAYE references.

Surrendered for R&D tax credits or Surrendered for R&D tax credits by R&D-intensive SME

The payable tax credits rate varies. For accounting periods starting on or after 1 April 2023 and ending on or before 31 March 2024 the rate is 10% unless the R&D intensity condition is met when it is 14.5%. For accounting periods starting on or after 1 April 2024, only loss-making R&D-intensive SMEs can claim payable tax credits and the rate is 14.5%.

In an accounting period in which the payable tax credits rate changes, you must enter the amount of the surrendered loss that is related to the period from which the new rate applies.

SME payable tax credits used to discharge other company liabilities in this CTSA return or SME R&D payable tax credits used to discharge other company liabilities in this CTSA return

Use the help tip for guidance on what to enter here.

R&D expenditure credits (RDEC)

This section summarises all R&D claims where the R&D claim type is any of RDEC - subcontracted to SME, RDEC credits or RDEC SME subsidised/capped.

You must enter additional details at R&D Expenditure credits (see below).

Total R&D credits and RDEC set off against liabilities in this return period

This summarises the data entered and/or calculated elsewhere.

R&D expenditure refunded

This summarises all R&D claims where the R&D claim type is R&D expenditure refunds. This R&D claim type cannot be selected in accounting periods starting on or after 1 April 2016.

This sets out the R&D Expenditure Credits made in the period for this trade. The entries are used to complete the relevant boxes of the CT600 and CT600L.

R&D expenditure credits (RDEC)

Enter the relevant details in each box, as appropriate. Use the help tips for guidance as to what to enter.

Where an amount of RDEC is surrendered from or to any group company, click the relevant linked value to open the appropriate pop-up. In the pop-up, click Add and enter each group company's name, accounting period start and end date (if different to this company), unique tax reference and the amount in the row that appears.

RDEC carried forward

This summarises the RDEC to be carried forward. If there is any step 2 restriction c/f, some or all of it may be surrendered to one or more group companies. Click the relevant linked value to open the appropriate pop-up. In the pop-up, click Add and enter each group company's name, accounting period start and end date (if different to this company), unique tax reference and the amount in the row that appears.

RDEC surrendered

This summarises the RDEC surrendered to all group companies entered elsewhere.