Making Tax Digital for Income Tax (MTD for Income Tax, or MTD ITSA) is now live. Since 6 April 2026, sole traders and landlords with qualifying income above £50,000 must keep digital records and send HMRC a summary of their income and expenses every quarter, instead of filing one Self Assessment return a year. The change that trips people up is what it does not do: it does not change when your tax is due. You still pay on 31 January and 31 July as before. What changes is how often you report – and that has real, if often overlooked, consequences for your working capital.
This guide explains who is caught, what you actually have to do, what it costs in cash terms, and how to turn the new quarterly rhythm into a cash flow advantage rather than just another admin burden. If you run a business or a property portfolio and have been putting off thinking about this, it is worth twenty minutes now.
Who Has to Comply, and When
MTD for Income Tax is being phased in by income level. From 6 April 2026 it applies if your qualifying income for the 2024/25 tax year was more than £50,000. From April 2027 the threshold drops to £30,000, and from April 2028 to £20,000. So even if you are below £50,000 today, there is a good chance you will be brought in within two years.
The phrase that catches people out is “qualifying income”. It means your gross income from self-employment and property combined – that is, your turnover before you deduct a single expense, allowance or cost. It is not your profit. Take Meera, who lets three flats in Nottingham producing £38,000 in rent and does freelance interior styling on the side worth £18,000 a year. Neither activity breaches £50,000 on its own, but combined her qualifying income is £56,000 – so she is in the first wave from April 2026, even though her actual taxable profit is far lower. If you have more than one income stream, add the gross figures together before assuming you are exempt.
What Actually Changes: Four Updates Plus a Final Declaration
Under MTD ITSA you make five submissions per tax year instead of one. Four are quarterly updates – running totals of your income and expenses pulled from digital records – and the fifth is a Final Declaration that replaces the old Self Assessment return and confirms your full position for the year.
The quarterly deadlines are fixed: 7 August (for the quarter to 5 July), 7 November (to 5 October), 7 February (to 5 January) and 7 May (to 5 April). For the 2026/27 tax year, your first update is due by 7 August 2026, and the Final Declaration for that year is due by 31 January 2028 – the same January date you already know. You must use MTD-compatible software to keep the records and file; you cannot type the figures straight into the old HMRC portal anymore.
The Myth That Costs People Sleep: Your Tax Is Not Due Any Sooner
The single most common worry is that quarterly reporting means quarterly tax bills. It does not. MTD changes the reporting cadence, not the payment cadence. Your income tax and Class 4 National Insurance are still due on 31 January (balancing payment plus first payment on account) and 31 July (second payment on account), exactly as under Self Assessment. Sending HMRC a quarterly summary does not trigger a payment.
That distinction matters for your cash planning. The money you owe and the dates you owe it are unchanged, so the discipline of setting aside a percentage of every payment you receive remains your best defence against a nasty January. If you have ever been caught out by a tax bill you knew was coming but had not funded, our guide on why a profitable business can still be short of cash covers the habit that prevents it.
The Hidden Costs You Need to Budget For
While your tax bill is unchanged, MTD does introduce genuine new cash costs, and these are easy to miss when you are focused on the deadlines.
The first is software. You now need an MTD-compatible package or bridging tool, and most are sold as a monthly or annual subscription – typically somewhere between £100 and £400 a year depending on the product and whether you bundle bookkeeping features. That is a recurring operating cost that did not exist when you filed once a year on a free portal.
The second is time, or someone else’s time. Four updates a year means your bookkeeping has to be current four times a year, not reconstructed in a panic each January. If you do it yourself, that is hours of your time spread across the year. If you use a bookkeeper or accountant, expect their fees to reflect the extra quarterly touchpoints. Either way, build the cost into your budget now rather than discovering it in August.
The practical move is to treat the software subscription and any additional accountancy fee as fixed monthly outgoings in your forecast, the same way you would treat insurance or a software-as-a-service tool you depend on.
How Quarterly Reporting Can Actually Help Your Cash Flow
It is easy to frame MTD purely as a burden, but the quarterly rhythm has a genuine upside if you use it. Under the old system, many sole traders only looked at their full numbers once a year, often months after the period had ended. By then it was far too late to do anything about a slow quarter. Keeping digital records and reviewing them every three months gives you four honest snapshots of how the business is actually doing – which is exactly the raw material for a cash flow forecast.
Consider Dan, a self-employed electrician in Cardiff turning over £64,000. Before MTD he kept receipts in a shoebox and handed everything to his accountant each January. Now, because he reconciles his records every quarter, he can see in early November that his October cash position is thinner than the same point last year, and he has time to chase outstanding invoices and tighten his spending before Christmas. The reporting obligation forced a habit that makes his business more predictable. Pairing those quarterly figures with a rolling 13-week cash flow forecast turns a compliance task into an early-warning system.
Turn your quarterly figures into foresight: our step-by-step guide to building a 13-week cash flow forecast shows how to use the numbers MTD already makes you collect to see cash squeezes – including your July and January tax payments – before they arrive.
Penalties: What Bites, and When
HMRC has built in a soft landing, but it is narrower than many people assume. For the first year, 2026/27, there are no penalties for missing a quarterly update deadline – though you still have to keep digital records and you cannot file your Final Declaration without the updates. From 2027/28 a points-based system applies: each missed quarterly update or Final Declaration earns one point, and once you reach four points you are fined £200. Points expire after twelve months of full compliance.
The crucial caveat is that the soft landing covers reporting, not payment. Late payment penalties are unaffected and apply from the first year. They start accruing from day 16 after a payment due date and escalate the longer the tax stays unpaid, on top of interest. In other words, you can be forgiven a late quarterly summary in year one, but you will not be forgiven a late tax payment on 31 January. This is one more reason the cash discipline matters far more than the filing deadlines.
How MTD Interacts With VAT and Your Other Cycles
If you are VAT-registered, you are already living with MTD for VAT and its own quarterly stagger. MTD for Income Tax runs on tax-year quarters (to 5 July, 5 October, 5 January and 5 April) by default, which may not line up with your VAT periods. You can elect to use calendar-month quarter-ends to simplify the dates, but the two regimes remain separate filings. The risk is purely administrative – more dates to track – rather than financial, but a clash of cycles is exactly the kind of thing that turns into a missed deadline if you are not deliberate about it. If you are weighing how your VAT scheme affects the timing of cash in and out, our guide on the VAT cash accounting scheme is a useful companion.
Your MTD Working Capital Checklist
Start by confirming whether you are actually in scope. Add up your gross self-employment and property income for 2024/25; if the combined figure tops £50,000 you are mandated now, and if it is over £30,000 you will be from April 2027. Do not rely on either figure alone if you have more than one income stream.
Next, choose and pay for MTD-compatible software, and put the subscription in your budget as a recurring cost. If you use an accountant, ask them now what their quarterly process and fees will look like, so there are no surprises. Then put the four quarterly dates – 7 August, 7 November, 7 February and 7 May – in your calendar alongside the unchanged 31 January and 31 July payment dates, and make sure you can tell at a glance which dates are about reporting and which are about money leaving your account.
Most importantly, use the quarterly habit for something more than HMRC. Each time you prepare an update, take ten extra minutes to check your cash position, chase anything overdue, and confirm you have set aside enough for your next tax payment. Keep a separate tax savings pot and move a fixed percentage of every receipt into it so that 31 January funds itself. If a genuine timing gap still opens up – a strong quarter followed by a large tax payment, say – that is what short-term working capital finance is for, but the goal is to need it rarely. Handled well, MTD is less a tax headache than a standing prompt to look at your numbers four times a year, which is something every business owner should be doing anyway.