Making Tax Digital for VAT in Business Central: Setup Guide

Every VAT-registered business in the UK has to keep digital VAT records and file returns through software that connects to HMRC. Business Central's UK localisation does this natively. You do not need bridging software or an add-on, but you do need to set it up correctly.

This guide follows Microsoft's documented process and HMRC's rules. It covers the HMRC connection, obligations, submission, fraud prevention headers and the errors that most often stop a return going through. It is written for finance leads who run, or are about to run, VAT on Microsoft Dynamics 365 Business Central.

What Making Tax Digital for VAT actually requires

Making Tax Digital (MTD) for VAT first applied in April 2019 to businesses with taxable turnover above the VAT threshold, then at £85,000. From April 2022 it was extended to every VAT-registered business, regardless of turnover. If you are registered for VAT, it applies to you unless HMRC has granted an exemption.

HMRC's rules are set out in VAT Notice 700/22. In practice they come down to three requirements:

• Digital records. You must keep your VAT records in functional compatible software. That covers designatory data (business name, principal place of business, VAT registration number, any VAT accounting schemes), the tax point, value and VAT rate of each supply you make, the tax point, value and input tax on supplies you receive, and the summary totals behind each return.
• Digital links. Where more than one piece of software is involved, data must move between them electronically, for example by import, export or API. HMRC states that manual re-keying, and copy and paste, do not count as a digital link.
• Submission by API. The return itself must be sent to HMRC through its API platform, from software that can also receive information back.

Invoices do not have to be held digitally. Exemptions are narrow, and HMRC says extra cost or effort alone is not enough.

How Business Central's UK localisation handles MTD

Business Central's UK localisation includes MTD for VAT as standard. Microsoft documents it in Making Tax Digital in the United Kingdom on Microsoft Learn. Records, return and submission all sit in one system, so no bridging spreadsheets are needed.

The functionality breaks down into six parts:

• HMRC VAT Setup service connection. An OAuth connection, found on the Service Connections page, that authorises the Microsoft-managed "Dynamics 365 Business Central MTD VAT" application to act on your behalf with HMRC.
• VAT return periods (obligations). The Get VAT Return Periods action pulls your obligations from HMRC. Business Central uses them to fill in return dates and to remind you of due and overdue returns.
• The VAT Return. The return is created from a period. Suggest Lines calculates the boxes from your VAT entries, then the return is released and submitted.
• Submitted returns. Receive Submitted VAT Returns retrieves a return HMRC already holds for a period.
• VAT Liabilities and VAT Payments. Separate pages with Get Liabilities and Get Payments actions show what HMRC says you owe and what it has received for a date range.
• Fraud prevention data. Business Central sends the HMRC-mandated fraud prevention headers with each call. It shows the user the header content and asks for consent before anything is sent.

There are two documented gaps. Business Central does not support HMRC agent services, so an accountant cannot file through your tenant under their agent credentials. It also has no built-in way to pull entries from other companies that share one VAT registration number for group VAT. If either applies to you, plan for it before go-live. A dedicated resubmission function is listed by Microsoft as under investigation for 2027 release wave 1.

Before you start: what you need in place

Most MTD problems trace back to setup skipped before connecting. Check these first:

• HMRC credentials for the business. The person authorising the connection signs in to GOV.UK with the business's HMRC credentials and grants authority. Agree internally who holds these.
• Correct VAT registration number on Company Information. Business Central asks you to confirm it after the connection test. It must match HMRC's record exactly.
• Clean VAT posting setup. The return is calculated from VAT entries, which come from your VAT business and product posting groups. If those combinations are wrong, the return will be wrong, however good the connection is.
• A current version. Microsoft says you need the latest version of the Making Tax Digital functionality for fraud prevention data. The User IP Address Service field is available from version 20.1. Your admin can check the version in the admin center.
• On-premises only: an Azure app registration (client ID, client secret and redirect URL), a VAT report configuration with the codeunit IDs Microsoft lists, and firewall rules that allow traffic to and from HMRC.

If you are still on a migration or partway through a finance rollout, it is worth fixing VAT posting groups as part of the Business Central finance implementation rather than after your first return.

Step-by-step: connecting Business Central to HMRC

These steps follow Microsoft's documented process for Business Central online, with on-premises differences noted. Page and action names are as they appear in the product, which uses US spelling for "Authorization".

A company admin also needs to give one-off consent for each web application that talks to HMRC's VAT APIs. Without that consent, the device data needed for the fraud prevention headers cannot be sent.

Creating, submitting and tracking a VAT return

Once the connection and periods are in place, each quarter follows the same routine:

1. On VAT Return Periods, select the open period and choose Create VAT Return, then Yes to open it.
2. Choose Process, then Suggest Lines. Amounts are calculated from your VAT entries and appear under Report Lines. You can choose whether to include open entries only or open and closed, and whether to pick up entries from earlier periods, which is useful for late supplier invoices.
3. Choose Release. This locks the return and makes the Errors and Warnings FastTab available. Releasing does not submit anything. To make changes, reopen it.
4. Choose Submit. When HMRC's response contains the return, the status changes to Accepted.
5. Run Calc. and Post VAT Settlement to close the open VAT entries and move the balance to your VAT settlement account. Microsoft's documentation ties this action to the Accepted status.

What each status means

If a return was filed for a period but Business Central does not show it as accepted, open the VAT Return Period Card and choose Receive Submitted VAT Returns to pull HMRC's copy.

Mistakes on a return that has already been accepted are corrected under HMRC's error rules, not by editing the old return. According to VAT Notice 700/45, net errors up to £10,000, or up to £50,000 where they do not exceed 1% of box 6 for the current period, can usually be corrected on the next return. Larger or deliberate errors must be notified to HMRC separately.

Fraud prevention headers: what Business Central sends

Since 2021, HMRC has refused API calls that do not carry fraud prevention headers. Business Central sends them when you get VAT return periods, submit a return or get the status of a submitted return. Microsoft's fraud prevention data documentation lists the full set.

Most online tenants use the WEB_APP_VIA_SERVER connection method. With this method the headers describe the user's device, browser and session, plus Business Central's own version and server details.

Three practical points:

• Before anything is sent, the user sees the header content and is asked for consent. If they cancel, nothing goes to HMRC.
• Microsoft recommends the same person submits from the same device each time, so the header data stays consistent.
• The public IP header depends on the User IP Address Service endpoint in VAT Report Setup. If that field is blank, or the endpoint is blocked by your network, header validation is where problems start.

Common MTD errors in Business Central and how to fix them

Reauthorisation catches many finance teams out because it happens so rarely that nobody remembers how. Put a reminder in the finance calendar well inside the 18-month window (ICAEW guidance notes some software asks more often), and record which HMRC sign-in is used.

Where the problem lies in your VAT figures rather than the connection, the cause is usually upstream: unreconciled bank accounts, duplicated purchase invoices or wrong posting groups. Our guide to bank reconciliation in Business Central covers the month-end side.

A note on MTD for Income Tax

MTD for Income Tax is separate from MTD for VAT, and Business Central's MTD functionality covers VAT only. It applies to sole traders and landlords registered for Self Assessment, not to limited companies. HMRC's eligibility guidance sets these dates:

If your business runs on Business Central through a limited company, this will not change your VAT process. It matters if directors or partners have their own self-employment or property income, which they will need to report with separate MTD-compatible software.

Checklist before your first MTD submission

• VAT registration number on Company Information matches HMRC exactly.
• HMRC VAT Setup connection tested successfully, and you have recorded who authorised it and when.
• User IP Address Service set to a supported endpoint and reachable from your network.
• Admin consent given for fraud prevention data.
• VAT return periods retrieved from HMRC, with none created manually.
• VAT posting setup reviewed, and the VAT control account reconciled to the trial balance.
• Suggest Lines options agreed: open entries only, or open and closed; current period only, or earlier periods too.
• One named person and device used for submissions, with a deputy who has been trained.
• The first live return run several days before the deadline, leaving time to fix any connection issue.
• A reauthorisation reminder set inside the 18-month window.

If your team will be filing for the first time, short hands-on Business Central training for whoever owns VAT is usually quicker than learning on a live return. For ongoing help with connections, reauthorisation and quarter-end, see our Business Central support.

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