Making Tax Digital is HMRC’s programme to move the UK’s tax system entirely onto digital records and digital submissions. It sounds like admin. It is admin. But it’s also mandatory, the penalties for non-compliance compound quickly, and a surprising number of small agency owners are either not compliant, not prepared for what’s coming, or both.
This guide covers the current state of MTD clearly and practically — what’s already in force, what’s arriving, what it means day-to-day for a digital agency running retainers, project fees, and contractor costs, and how to set your financial infrastructure up so compliance is low-friction rather than a quarterly scramble.
MTD Explained: Two Different Programmes You Need to Understand Separately
The phrase “Making Tax Digital” covers two distinct programmes that affect different types of taxpayer. Treating them as one thing — which many agency owners do — leads to confusion about what’s actually required right now.
MTD for VAT has been live since April 2019 for businesses above the VAT threshold (currently £90,000 taxable turnover), and since April 2022 for all VAT-registered businesses regardless of turnover. If your agency is VAT-registered — which it almost certainly is if you’re billing clients more than £90,000 per year — you are already legally required to maintain digital VAT records and submit your VAT return via MTD-compatible software. This is not optional or “recommended.” It is the law and HMRC actively enforces it.
MTD for Income Tax Self Assessment (ITSA) is the bigger change and the one most sole traders and small agency directors haven’t fully reckoned with yet. It requires self-employed individuals and landlords to submit quarterly digital updates of their income and expenses to HMRC, replacing the current annual Self Assessment. It was originally scheduled for 2023, then 2024, then 2026. The current confirmed timetable is:
- April 2026: Mandatory for self-employed individuals and landlords with income over £50,000/year
- April 2027: Mandatory for those with income over £30,000/year
- Income below £30,000: Under review; further announcement expected
If you’re running your agency as a limited company, MTD for ITSA applies to your Self Assessment as an individual director drawing a salary and dividends — not to the company’s Corporation Tax return. MTD for Corporation Tax has been confirmed but is not expected before 2026 at the earliest, and details are still being consulted on.
Quick compliance check
VAT-registered agency? You must already be submitting VAT returns via MTD-compatible software. If you’re not, you’re non-compliant today.
Agency director with self-employed income or rental income over £50k? You need quarterly digital reporting from April 2026.
Sole trader running an agency? Same as above — April 2026 if income exceeds £50k, April 2027 if between £30k–£50k.
MTD for VAT: What It Actually Requires Day to Day
For most digital agencies already using accounting software, MTD for VAT is largely invisible — your accountant or bookkeeper handles it via Xero, QuickBooks, or FreeAgent, and your returns go through automatically. But there are specific requirements that catch agencies out, particularly those mixing modern cloud accounting with legacy processes or spreadsheets.
The key requirement is digital links throughout your VAT accounting chain. HMRC defines a digital link as an electronic transfer of data — so you cannot manually retype a figure from one system into another at any point between recording a transaction and filing the return. The entire trail must be digital. Copying numbers from your project management software into a spreadsheet and then into Xero by hand breaks the chain. So does any other manual re-entry step.
For agencies, this is where the complexity lies. Most small agencies have at least one manual handoff in their finance process — someone pulls a monthly invoice list from their project management tool, emails it to the bookkeeper, and the bookkeeper enters it manually into the accounting system. Under MTD for VAT, this manual re-entry is technically non-compliant. HMRC’s soft landing period for digital links ended in April 2021, so there is no longer any grace period.
In practice, HMRC is not actively auditing every small agency’s data entry process. But if your accounts are ever investigated — whether for VAT or any other reason — gaps in your digital link chain become relevant. The practical fix is to either use accounting software that connects directly to your invoicing system, or to ensure invoices are raised within the accounting software itself. An agency using Xero and raising all invoices inside Xero has no problem. An agency raising invoices in a separate tool and manually reconciling them does.
The most common legitimate approach for agencies is to use software with a direct integration to their accounting package. Marque CRM integrates with both QuickBooks and Xero, meaning invoices raised in the CRM push through to your accounting software automatically — preserving the digital link and removing the manual re-entry step that creates compliance gaps.
MTD for ITSA: What Changes for Agency Owners
The shift to quarterly digital updates is a more fundamental change to how agency owners manage their personal tax position. Currently, most directors and self-employed agency owners do one Self Assessment per year, filing by 31 January for the previous tax year. MTD for ITSA replaces this with four quarterly updates per tax year plus an end-of-year finalisation.
The quarterly updates are not quarterly tax payments — you don’t have to pay tax four times a year instead of twice. They are digital submissions of your income and expenses for that quarter, sent to HMRC via MTD-compatible software. The purpose is to give HMRC a more current view of your financial position and to spread the record-keeping burden through the year rather than compressing it into January.
What this means practically:
- You (or your accountant) will need to submit quarterly updates by specific deadlines: 5 August, 5 November, 5 February, and 5 May for each quarter of the tax year
- Records must be maintained digitally throughout the year — not reconstructed at year end from bank statements and memory
- An end-of-year finalisation (equivalent to the current Self Assessment) still happens after the tax year ends
- The software you use must be HMRC-recognised for MTD for ITSA — not all accounting tools are approved yet, though the main providers (Xero, QuickBooks, FreeAgent) are actively building compliance
The biggest behavioural change is that agency owners who currently do their accounts once a year in a rush will need to adopt at minimum a quarterly cadence. For many, this is actually beneficial — you’ll have a clearer view of your tax liability throughout the year, you’re less likely to face a shock bill in January, and your accountant can give you better advice when they’re looking at near-real-time data rather than reconstructing a picture 18 months after the fact.
Penalties under MTD for ITSA
HMRC is introducing a new points-based late submission penalty system alongside MTD for ITSA. Each missed quarterly submission earns a penalty point. Accumulate enough points and you receive a £200 fixed penalty — and further penalties for each subsequent miss. Unlike the old regime, these stack quickly for persistent late filers. The system is designed to be more forgiving of the occasional slip but more severe for habitual non-compliance.
Agency-Specific Considerations HMRC Won’t Tell You About
The MTD guidance on GOV.UK is written for the average sole trader or property landlord. Digital agencies have financial structures that create complications the generic guidance glosses over. Here are the specific issues most relevant to a typical UK agency:
Foreign client invoices and currency. If you invoice clients in euros, dollars, or any other non-sterling currency, your accounting software needs to handle the foreign exchange conversion correctly for VAT purposes. The VAT return figure must be in sterling, using the exchange rate at the point of supply. Most agency owners using cloud accounting software get this right automatically, but agencies using older systems or home-built invoice templates frequently get it wrong.
Subcontractors and the reverse charge. Since March 2021, the domestic reverse charge has applied to construction services, but more relevant for digital agencies is the reverse charge that applies to services purchased from VAT-registered businesses in other EU countries. If your agency buys freelance services from a European contractor, you may need to account for VAT under the reverse charge mechanism. This must be handled correctly within your MTD-compatible software — manual adjustments after the fact are a digital link break.
Retainer clients and accrual vs. cash basis. Most digital agencies recognise revenue when invoiced (the invoice basis), but some smaller agencies operate on the cash basis — recognising income only when received. Under MTD for ITSA, the cash basis remains available for self-employed individuals with turnover under £150,000, and is in fact the default from 2024/25 onwards following the Spring Budget 2023 changes. Understand which basis applies to your Self Assessment and make sure your software is configured accordingly, because switching basis mid-year creates reconciliation headaches.
Mixed income sources. Many agency directors have more than one income stream: salary and dividends from their limited company, plus perhaps freelance income, rental income, or income from a side project. MTD for ITSA requires a separate quarterly submission for each source of self-employment income. If you have two self-employed income streams, you’ll be filing eight quarterly updates per year, not four. Make sure your accountant is aware of the full picture.
Expenses that span business and personal use. Agency owners frequently have expenses that are partly business and partly personal — a mobile phone on a business contract, a home office portion of utility bills, a car used for client visits. Under MTD for ITSA, these expenses need to be apportioned correctly in each quarterly submission. Leaving the apportionment to year-end — as many people currently do — will no longer be straightforward, because HMRC will have seen four submissions without the adjustment applied.
Choosing the Right Software: What to Look For
HMRC maintains a list of recognised MTD-compatible software on GOV.UK. For VAT, the list is now extensive and well-established. For ITSA, it is growing but not yet complete — if your current accounting software isn’t on the list, you need to raise this with your provider now rather than in early 2026.
The main accounting platforms used by UK digital agencies and their MTD status:
- Xero — fully MTD for VAT compliant; MTD for ITSA capability in development, confirmed as a priority
- QuickBooks Online — fully MTD for VAT compliant; MTD for ITSA capability confirmed and in development
- FreeAgent — fully MTD for VAT compliant; MTD for ITSA in development (note: FreeAgent is owned by NatWest and often bundled with business banking)
- Sage Business Cloud — fully MTD for VAT compliant; MTD for ITSA in development
Beyond the accounting software itself, the question for agencies is how the rest of your financial workflow connects to it. An agency typically generates financial data in several places: project management (tracked time, expenses), invoicing, contractor payments, and expense reports. For MTD compliance, all of these need to connect to your accounting system without manual re-entry breaking the digital link chain.
The practical answer for most agencies is to consolidate as much financial activity as possible into a single platform that connects directly to their accounting software. Using a purpose-built agency management platform for invoicing, expense tracking, and retainer billing — with a native integration to Xero or QuickBooks — means your accounting package receives clean, categorised data automatically. The alternative — exporting CSVs and importing them monthly — is fragile, time-consuming, and creates exactly the manual intervention that MTD rules are designed to eliminate.
Marque CRM’s accounting integrations push invoices, expenses, and retainer billing directly into both QuickBooks and Xero. If you’re managing client billing through the platform, your accounting records update automatically, with no re-entry and no gaps in the digital chain.
What to Do Before April 2026: A Practical Checklist
April 2026 is close enough that the groundwork needs to start now, particularly if you’re currently doing your accounts in a way that relies on manual processes or year-end reconstruction. Here’s a realistic action plan:
Step 1: Confirm your VAT compliance today. If your agency is VAT-registered and you’re not already submitting via MTD-compatible software, this is urgent. You are non-compliant now. Contact your accountant and get this resolved immediately. The fix is usually straightforward — switching to or properly configuring accounting software — but it needs to happen.
Step 2: Audit your digital link chain. Map out how financial data flows from the point a transaction happens to the point it appears in your VAT return or accounts. Identify any step where data is manually typed or re-entered rather than transferred digitally. Each of those steps is a compliance risk and an operational inefficiency.
Step 3: Decide which accounting software you’ll use for MTD for ITSA. If you’re on a recognised platform already (Xero, QuickBooks, FreeAgent), check with your provider that ITSA functionality is on their roadmap and find out when it will be available. If you’re using desktop accounting software, a legacy system, or spreadsheets, you need to migrate to a cloud platform before April 2026.
Step 4: Brief your accountant. Not all accountants are equally prepared for MTD for ITSA — particularly smaller practices that haven’t yet invested in MTD-ready workflows. Ask your accountant directly: “Are you set up to handle my MTD for ITSA quarterly submissions from April 2026?” If the answer is vague or uncertain, it’s worth exploring alternatives. MTD is creating a two-speed accountancy profession and smaller practices risk falling behind.
Step 5: Review your bookkeeping frequency. If you currently do your bookkeeping quarterly or annually, shift to monthly. For MTD for ITSA you’ll need your records to be current within weeks of each quarter end, not within months. Monthly bookkeeping — or a system where transactions are categorised in near real time — is the only realistic foundation.
Step 6: Consolidate your financial data sources. The more systems feeding into your accounts, the more risk of breaks in the digital chain and the more complexity in your quarterly submissions. If your agency is managing client billing in one tool, expenses in another, and time tracking in a third, consider consolidating onto a platform that handles all three with direct accounting integrations. It simplifies MTD compliance and almost certainly reduces your admin overhead significantly regardless of tax requirements.
The goal: boring compliance
The best outcome of preparing for MTD is that compliance becomes invisible — quarterly submissions go out automatically, your accountant has everything they need without chasing you, and tax season stops being a source of anxiety. That requires setting up the right systems now, not adapting at speed when deadlines arrive. Agencies that get this right typically find their overall financial visibility improves significantly as a side effect.
Your Clients and MTD: An Opportunity Worth Noticing
If your agency builds websites, manages digital marketing, or offers any kind of ongoing support to small businesses, MTD is also a commercial opportunity. Many of your clients are facing the same compliance challenges you are — and they know even less about it than you do.
Specifically, clients who are currently running their businesses on outdated software, paper records, or disconnected tools will need to modernise before April 2026. If you have clients in that position, now is an excellent time to position your agency as the partner who can help them get there — whether that means recommending and setting up accounting software, building integrations between their e-commerce platform and accounting system, or simply making sure their digital infrastructure is MTD-compatible.
This is a conversation that positions you as a strategic partner rather than a task executor, and it surfaces genuine needs your clients have right now. “We’re sorting out our own MTD compliance at the moment, and we thought we’d check in with you on where you’re at with it” is a natural, non-salesy opener that can lead directly to project discussions.
For e-commerce clients specifically — particularly those on Shopify — the connection between transaction data and accounting records is often a mess that neither the client nor their accountant has properly resolved. Shopify’s integration with accounting software has improved significantly, but there are still gaps in how refunds, disputes, and cross-border sales are handled. If your agency manages Shopify stores, understanding these gaps gives you a genuinely valuable service to offer ahead of MTD deadlines.
Getting Your House in Order: The Bottom Line
Making Tax Digital is not an optional upgrade. MTD for VAT is already law and has been since 2019; if your agency is VAT-registered and not submitting digitally, the question is not whether you have a problem but when HMRC will notice it. MTD for ITSA arrives in April 2026 for the majority of agency directors and founders drawing meaningful income — less than two years away.
The agencies that treat this as a reason to modernise their entire financial infrastructure will come out ahead. Better bookkeeping cadence, cleaner data flows, accounting software connected directly to billing and expense systems — these aren’t just compliance measures, they’re genuine operational improvements. An agency with real-time visibility into its invoicing, expenses, and cash flow makes better decisions, has more productive conversations with its accountant, and spends far less time on financial admin each month.
The agencies that delay, continue with manual processes, and try to adapt at speed in 2026 will face exactly the kind of avoidable scramble that makes January already painful — except they’ll face it four times a year. Start the groundwork now: audit your digital chain, confirm your accounting software roadmap, shift to monthly bookkeeping, and brief your accountant. None of it is technically complex; it just requires doing it before the deadline rather than after.
Explore how Marque CRM handles invoicing, retainer billing, and accounting integrations, or see how automating your invoice workflow reduces the manual processes that MTD is designed to eliminate. If you’re managing your agency’s finances across multiple tools, our guide to building a billing system that doesn’t leak revenue is worth reading alongside this one.