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MTD for ITSA made easy for you and your clients

MTD Assist is for firms that want to add value without having to chase clients quarterly.
And for clients who don't want to use bookkeeping software or pay you to do it for them.

  • Quick to set up
  • No training required
  • Free for your firm
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If this sounds familiar,
you need MTD Assist

Your digital-ready clients won’t be a problem. It’s the other ones. The clients who don’t use bookkeeping software. The ones who hand over a pile of receipts at year-end. Those you already spend too much time chasing.

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“We want clients to move onto Xero or Sage, but that won’t work for everyone.”

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“If clients struggle, we’ll offer a paid bookkeeping service. Isn’t that the only alternative?”

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“Our tax software handles MTD submissions, but we’re worried that we’ll have to chase clients every quarter.”

MTD made simple

Faster Compliance. Fewer Headaches.

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Avoid chasing clients

MTD Assist puts deadlines back on clients, with self-serve quarterly filing, and an optional review step when you want to add value.

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Protect your relationship

Unlike Xero and Sage, MTD Assist ensures the final declaration stays with your firm, so you remain essential and in control year-end.

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Simple for clients

It's an intuitive tool that’s designed with simplicity at its core. Everything clients need for quarterly submissions and nothing they don't.

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Compliance without support

Because recordkeeping is spreadsheet-simple, clients stay compliant without your team needing to provide software support.

Affordable for clients, valuable for you

MTD Assist is free for firms and affordable for clients. With built-in upsell potential, it’s a tool you can bundle, brand, and profit from, without barriers.


Whether you cover the cost, pass it on to your clients, or let them pay directly, you stay in control while offering them a seamless experience.

The complete package

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    Free for firms
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    Dedicated onboarding assistance
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    White-labelling available

Quarterly MTD submissions made easy

MTD Assist is the no-fuss way for busy accountants to keep clients compliant, without adding workload or tech support headaches.

  • Simple, intuitive interface
  • Direct HMRC integration
  • Automated quarterly submissions
  • Client-friendly dashboard
  • Affordable annual subscription

Quick to setup - Simple and intuitive to use - No training required.

Intentionally priced to be accessible to all

Billed directly to your clients by Glasscubes,
at just...

£36 +VAT per tax year
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Firms opting for centralised billing enjoy an exclusive discounted rate.
HMRC Approved
MTD for Income Tax FAQ

Questions firms ask about MTD for Income Tax

Who has to use MTD for Income Tax, and from when?

Sole traders and landlords registered for Self Assessment whose qualifying income is over £50,000 on their 2024-25 return have had to use it from 6 April 2026. The threshold falls to £30,000 (2025-26 return) from 6 April 2027, and to £20,000 (2026-27 return) from 6 April 2028. HMRC: find out if and when you need to use it.

What counts as qualifying income?

Total self-employment and property income before expenses — turnover, not profit. Only the client’s share of jointly owned property counts. A partner’s share of partnership profit, employment income, pensions and dividends do not. HMRC: work out your qualifying income.

When are the quarterly updates due?

7 August, 7 November, 7 February and 7 May, for the quarters to 5 July, 5 October, 5 January and 5 April. Each update is cumulative from the start of the tax year, and the tax return is still due by 31 January. See every 2026-27 deadline.

Are there penalties for a late quarterly update in 2026-27?

No. HMRC has said there are no penalties for missing a quarterly update deadline in the 2026 to 2027 tax year. Points-based penalties for quarterly updates start from 2027-28, and the tax return deadline is penalised as normal. HMRC: penalties for MTD for Income Tax.

Can clients keep their records in a spreadsheet?

Yes, as long as the spreadsheet is digitally linked to compatible software that sends the updates — HMRC calls this bridging software. MTD Assist keeps record-keeping spreadsheet-simple for clients who will not use bookkeeping software. HMRC: find compatible software.

Can clients send their own quarterly updates while we keep the tax return?

Yes. That is what MTD Assist is for. Clients send their own quarterly updates, with an optional review step for your firm, and the final declaration and year-end tax return stay with you.

How much does MTD Assist cost?

MTD Assist is free for firms. Clients pay £36 + VAT per tax year, and firms that choose centralised billing get a discounted rate.

Can the client pay for MTD software directly?

Yes. Glasscubes bills the client directly, so your firm has nothing to collect. If you prefer, you can cover the cost or pass it on to clients yourself.

Can we white-label MTD software for our practice?

Yes. White-labelling is available, so you can offer MTD Assist to clients as part of your own service.

How does MTD Assist compare with other MTD software?

We have compared the main options UK firms use — bookkeeping software, bridging tools and tax-return software — side by side, from each vendor’s own published material. MTD for Income Tax software compared.

Client feedback

Based on hundreds of client reviews

Ready to simplify MTD?

Get in touch today to learn how MTD Assist makes staying compliant effortless for your firm and easy for every client.