How to Prepare and Confirm Your MTD IT Submission

MTD IT quarterly submissions are mandatory and form the foundation of the year’s financial reporting. Accurate and timely updates ensure that when the fifth and final submission is completed — incorporating adjustments, reliefs, and any corrections — the resulting figures are based on reliable underlying data.

Before submitting any obligations, review all transactions entered for the reporting period across the entire company. This provides assurance that all income and expenses have been captured and categorised correctly. This review is particularly important if you are submitting multiple sets of obligations.

Landmark Systems are not tax specialists and cannot advise on how your nominal codes should be categorised. For any queries relating to allocation, please consult your Accountant or Tax Adviser.

Reviewing Transactions:

On the Self-Assessment screen:

1. Highlight the Tax Entity

2. Select Transactions to view all entries for the selected period - Transactions are grouped by HMRC Category

3. Use the + icon to expand each group and review the detailed transactions contributing to the totals. Check to make sure any new nominals you have created in the period are mapped correctly

Carefully verify that the reporting period is correct, all expected income and expenses are present, no transactions are duplicated or omitted, and values appear reasonable for the period.

Category allocation is determined by the Taxable Entity mappings applied to each transaction. If more than one Taxable Entity exists, the default allocation follows this hierarchy:

1. Analysis Taxable Entity (if the detail line contains an Analysis)
2. Enterprise Taxable Entity (if the detail line contains an Enterprise)
3. Nominal Taxable Entity
4. Nominal Group Taxable Entity
5. If no Taxable Entity is set, it must be assigned manually

Understanding this hierarchy is important when reviewing how transactions are mapped to HMRC categories.

Resolving Missing Taxable Entity Warnings

A red warning triangle icon displayed in the Taxable Entity or Category columns indicates that no Taxable Entity has been applied to that transaction. 

These transactions can and should be corrected before submission. Amend the allocation as required to ensure accurate reporting in Obligations.

Once all transactions have been reviewed and any necessary amendments made > Click Save to confirm your postings.

Submitting Obligations

Click on Obligations > Retrieve > Click on the required period below > Transactions

Check again before your first quarterly submission to make sure all your income and expenses are correct. Expand using the + sign (as previously described).

Go through the net totals for the quarter carefully to ensure the period’s transactions are right before hitting Confirm

Review the income and expenditure overall amounts, as HMRC expects quarterly updates to be as accurate as possible, even though you can make corrections later in the year.  This report can be exported to Excel if required.

Click on Submit to complete the submission process. You will get a message to say if it has been successful or not:

If you need to view the data after the submission has been made, you can highlight the quarter again in the Obligations screen and click on View Submission. There is also the option to Export the data to a .csv file.