6 April 2026 is not a concept anymore. It is a date.
This is not another post explaining what MTD for Income Tax is or why it matters. You already know. What you need now is the practical side sorted: how to onboard clients without chaos, how to price the additional work without underselling yourself, and how to get the right paperwork out the door quickly.
That is exactly what this post covers.
Start With the Source: HMRC's Agent Toolkit
Before anything else, HMRC published a dedicated agent toolkit in January 2026 and updated it in February 2026. It is the most comprehensive and authoritative resource available for agents right now, and it is free.
The toolkit covers client segmentation, preparing your practice, the conversation to have with each affected client before sign-up, how to sign clients up, software decisions, agent services account setup, and where to find further guidance and support from HMRC directly.
If you have not worked through it yet, that is the place to start.
Segmenting Your Clients: Who Is In and When
Your April 2026 clients are those whose combined gross income from self-employment and property exceeded £50,000 in the 2024/25 tax year. These are the ones that need your attention right now.
Check for exemptions at this stage too. Some are automatic, others need to be applied for. Digital exclusion is a valid basis where a client genuinely cannot engage with software.
Finally, if any clients work with a bookkeeper, clarify now whether you are acting as main agent or supporting agent, as this affects how quarterly submissions flow and what each party can and cannot do.
The Conversation to Have With Each Affected Client
Most clients will have already received a letter from HMRC about MTD. That letter is your natural opener. Ask if they received it, address any concerns, and reassure them that the change is more manageable than it sounds.
From there, the ground to cover is straightforward. Agree on software based on what they can realistically manage. Set expectations around record keeping frequency as monthly habits are easier to build now than fix later. If they are mixing personal and business transactions, a dedicated business bank account makes everything cleaner. If a bookkeeper is involved, agree roles and confirm software compatibility before sign-up. And remind them that HMRC does not copy agents on correspondence, so any MTD letters should come straight to you.
This is also the right moment to talk about revised fees. Clients are far more receptive when it is part of the onboarding conversation rather than a separate discussion that arrives later.
Signing Clients Up: Don't Leave It to April
HMRC will not be signing clients up. It must be done by either the client or the agent, and the sooner the better. Sign-up takes only a few minutes per client but leaving it until April leaves no room to troubleshoot if something does not go smoothly.
Before you begin, your agent services account needs to be in place with client authorisations loaded. You will need the client’s full name, date of birth, National Insurance number, and relevant business information. After sign-up, you can review and update the list of mandated income sources if needed.
One thing worth communicating clearly to clients: there are no penalty points for late quarterly updates in the 2026/27 tax year. That grace period does not extend beyond it though, so building good habits from the start is still the right approach.
Choosing MTD Software: Including Free Options
Software is the foundation everything else sits on. For clients with the simplest circumstances, a spreadsheet combined with bridging software is HMRC-compliant, provided data is digitally linked throughout and never manually copied across at any point. For clients with more complexity, dedicated MTD software is the more practical choice.
Not every client needs an expensive solution. There are genuinely capable free tools available that hold up well for straightforward sole traders and landlords. If you are still mapping out your software recommendations, our guide to the top free MTD software for accountants is a useful starting point.
Onboarding MTD Clients Without the Chaos
Once the client conversation is done and software is agreed, the actual onboarding begins: proposals, engagement letters, AML checks, risk assessments, and getting invoicing set up. At volume, doing this manually for every client is where practices lose hours they do not have.
Systemising this part of the process is how you protect your capacity across the coming months. Our guide on onboarding MTD clients efficiently walks through each stage so you are not piecing it together from scratch for every client you bring on.
Pricing MTD Services: Don't Undercharge
MTD genuinely changes the scope of work. There are quarterly touchpoints, software setup, client training, more contact across the year, and a final declaration on top of it all. If fees do not reflect that additional scope, practices absorb the cost quietly and feel it by the middle of the year.
The temptation to bundle MTD into existing fees to sidestep a difficult conversation is understandable, but it is the wrong call.
Pricing needs to account for client readiness, complexity, transaction volume, and how much hand-holding each client will realistically need. A straightforward sole trader and a client with multiple income streams are not the same job and should not be priced the same way. Our guide on how to price MTD ITSA services walks through the key factors, pricing models, and how to structure packages for different client types.
Get the Scope in Writing: Engagement Letters
MTD changes the service scope for most clients, which means existing engagement letters almost certainly need updating. HMRC’s own agent toolkit references professional body guidance under PCRT that specifically encourages agents to use letters of engagement that clearly define roles and responsibilities under MTD. Updating your engagement letters is not just admin. It is professional best practice with direct backing from HMRC and the professional bodies.
If drafting these individually from scratch is not realistic right now, we have a free MTD ITSA engagement letter template you can adapt and issue quickly. It covers quarterly reporting obligations, software responsibilities, and what each party is accountable for.
Keep It Consistent: Use a Checklist
As onboarding volume increases, small things get missed. A checklist keeps every client handled consistently, whether you are managing the process yourself or delegating to a team member. It also gives clients something concrete to work through, which makes the whole process feel structured and professional on your end.
Our MTD readiness checklist is there for exactly that purpose.
One Last Thing
The practices that come out of this period strongest will not be the ones who knew the most about MTD. They will be the ones who moved efficiently, charged fairly, and got their systems in place early. The knowledge is there. The guidance from HMRC is clearer than it has ever been. You have everything you need.
Onboard efficiently. Charge with confidence. Good luck with the 6 April go-live.
