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Get Started using CCH iFirm Making Tax Digital for Income Tax

This user document pertains to CCH iFirm MTDfIT in conjunction with CCH Central version 2025.110 or above

Overview

Making Tax Digital for Income Tax introduces the requirement for sole traders and landlords from April 2026 with a turnover over £50,000, expanding to those earning over £30,000 from April 2027 and over £20,000 from April 2028 to keep records in digital form and file their quarterly submission, perform their end of year adjustments and final declaration via compatible software.

Our priority is to support Advisors, and their Clients, by delivering an MTD for Income Tax solution that supports the full MTD requirement. This Get Started guide documents how to work with Making Tax Digital for Income Tax within CCH iFirm.

Signing up for MTD

HMRC has provided a step-by-step guide and video to help you set up the relevant accounts for MTD.
Making Tax Digital for Income Tax as an agent: step by step - GOV.UK and Sign up your client for Making Tax Digital for Income Tax - GOV.UK

Note:

Create a Government Gateway Account: If you don't already have one, you'll need to create a Government Gateway user ID and password. You can do this on the HMRC website.
Gather Your Information: Make sure you have your National Insurance number and Unique Taxpayer Reference (UTR) ready. These are required during the registration process.

Authorised as an Agent

The guidance serves as a reminder to both agents and taxpayers that it is the client’s responsibility to designate a main agent. Clients will receive consent statements outlining what information a main or supporting agent can access.

While clients can appoint multiple supporting agents to act on their behalf, only one main agent can be assigned at a time. If a new main agent is chosen, the previous one will lose access.

Supporting agents, however, will retain their authorisation even if additional supporting agents are added.

Useful Information! “If there is no need for a supporting agent, the process is very straightforward – HMRC has confirmed that those currently authorised as agents for Self Assessment will automatically become ‘main agents’ once the client is signed up to MTD.”

Prerequisites

Must have CCH Central version 2025.110 installed
Your practice has subscribed to CCH iFirm MTD for Income Tax
In CCH Central, a new task permission #Client#LaunchiFirmMTDfIT has been created to allow firms to select which employees can access MTDfIT.
Note: Without this permission you won't be able to launch MTDfIT.
.Net 8.0 runtime installed ( This is available via our CSI installer > Tools Install)

Note: You need to have signed up/subscribed to MTD for Income Tax on HMRC’s website, otherwise you will not be able to authorise CCH iFirm with HMRC. The revenue have produced a short video to guide you through the process (see below).

Process of Making Tax Digital for Income Tax

Video: Watch this video to find out how to sign up your client for Making Tax Digital for Income Tax

Useful Information! The authorisation with HMRC is expected to last for an 18-month period (so you do not need to regularly repeat it). However, if HMRC introduce any new APIs/services, then this may require CCH iFirm to be authorised again.

Please note: You need to have signed up your client and be authorised to act on their behalf for MTD for Income Tax, otherwise you will not be able to view their quarterly submission obligation in CCH iFirm.

How to Authorise CCH iFirm MTD for Income Tax with HMRC

Your practice must obtain an authorisation token from HMRC within the software before you can submit the Quarterly Account and Final Declaration.
In the current version of CCH iFirm MTDfIT, you can obtain the authorisation token via a dedicated 'link' within a MTDfIT client. In the next release, there will be an option within the software that allows users to obtain the authorisation token directly.
To navigate to the address in your internet browser, append /practiceauth to the end of the address after /Advisor (see screenshot below).

4. Enter the Agent Reference Number (ARN)

5. Click Authorise (underneath Authorisation)

6. You will be redirected to the HMRC website ( Government Gateway Sign-In required)

7. Click on 'Continue'

8. Enter your HMRC user ID and Password

9. Click on 'Sign in'
10. Click on 'Give permission'

Note: Your credentials used to sign into HMRC’s page, in order to grant permission for CCH iFirm MTD for Income to be your compatible software of choice with HMRC must be the same creedentials as your online services account that HMRC require all agents to have.

These will be used to use all the API-based services that HMRC provide.

The authorisation with HMRC is expected to last for an 18-month period, so should not need to be repeated frequently.

11. Once you have granted permission, your authorisation status should now be Active

How to create a CCH iFirm MTD for Income Tax client

Note: The starting tax year that CCH iFirm supports for MTD for Income will be 2025/26. You will not be able to create an MTD client for any previous years.

Please note: The NINO and post code are mandatory fields for MTD for Income, they must be present in the client record. Otherwise, an error will be shown and you won't be able to create that client in MTD for Income Tax, as these fields are used get the quarterly submission obligation from HMRC into CCH iFirm

In CCH Central, click on Create a new tax year within Tax Return
In the 'Create a new tax return' panel, select a tax year e.g 2026
Select the return type of MTD for IT in the Tax Year drop-down list.
Click Next >>
Link to the appropriate CCH Central Workflow or Tax flow (or click next if you don't use CCH Central Workflow)
Click Finish
You will be redirected to the CCH iFirm webpage. Log-in using your email address that is registered in CCH iFirm.
(Note: this email address here should match your employee email address in CCH Central)
Once logged in, you will see the MTD for Income Tax quarterly submissions screen for your client.

Important Note: Ensure that your practice has obtained the authorisation token before proceeding to the next step.

This is a one-time authorisation with HMRC and is valid for an 18-month period.

See the steps above under " How to Authorise CCH iFirm MTD for Income Tax with HMRC"

9. If your Practice doesn't have authorisation to act on the clients behalf for MTD for Income Tax, then you can click 'Request Authorisation'

Click on
Now, share that link with the Client

Note: The Client will need to grant you authorisation by logging into their online service account.
Once authorisation has been granted by the client, CCH iFirm MTDfIT will retrieve the quarterly submission obligations for the client, this is based on the previous years tax submission.

Adding income and expenses data

Click 'Add'
Click Add income and expenses
Click Upload Excel File

4. Click Choose a template
5. Select to download either 'Separated quarters' or 'Combined quarters'

6. Open the spreadsheet for each of your obligations

Note: If you have existing workbooks that you use to capture your clients income and expenses for example, you can include the MTD for Income Tax spreadsheet into your existing workbook and link the figures using macros or formulas so that it populates the tagged fields.

As long as the CCH iFirm spreadsheet is the first tab in the workbook, the data will be injected into CCH iFirm MTD for Income Tax. This is still a valid digital link from a MTD requirement point of view.

Please note: The client name, NINO, tax year and property/self employed details in the spreadsheet need to match what is in CCH iFirm for the client and obligation that you are uploading.

7. When you are ready to upload the file, select Add income and expenses and click upload from MS Excel
8. Click Upload File

If the client name, National Insurance Number (NINO), tax year and property/self employed details in the spreadsheet do not match what is CCH iFirm for the client and obligation you are uploading, then the error below is shown .