The next Making Tax Digital (MTD) deadline for many UK landlords is 7 August 2026. That date covers the first quarterly period of the 2026/27 tax year, from 6 April to 5 July. If you are already in Phase 1, this is not a soft reminder. It is the first real quarterly submit under MTD for Income Tax Self Assessment.

For a live walkthrough of filing a quarterly update, Lendlord is hosting a practical webinar: How to submit your first quarterly update with Lendlord’s MTD Hub, with a demo of connecting to HMRC and submitting an update in real time.

Who must meet the August deadline?

MTD for ITSA is rolling out by qualifying gross income from the previous tax year:

• Over £50,000: mandated since 6 April 2026
• Over £30,000: mandated from 6 April 2027
• Over £20,000: mandated from 6 April 2028

If your qualifying gross income was over £50,000, you should already be keeping digital records and using compatible software. The 7 August file is your first quarterly update for that mandate. 

What do you actually submit?

You do not send a full Self Assessment return on 7 August. You send a quarterly update through MTD-compatible software. It summarises income and expenses for 6 April to 5 July.

Think of it as a progress report to HMRC, built from digital records. The annual End of Period Statement and Final Declaration still come later, by 31 January after the tax year ends. That package replaces the traditional Self Assessment return process for those in scope. For more background on why earlier tax returns matter under MTD, see Lendlord’s guide on why MTD makes your tax return a critical document.

The rest of the 2026/27 calendar

Once Q1 is done, keep the full year in view:

• Q1: 6 April to 5 July – deadline 7 August 2026
• Q2: 6 July to 5 October – deadline 7 November 2026
• Q3: 6 October to 5 January – deadline 7 February 2027
• Q4: 6 January to 5 April – deadline 7 May 2027

Diary each date when you finish Q1. Landlords who treat August as a one-off often scramble for November. A fuller first-deadline briefing is also available in Lendlord’s guide, MTD for UK landlords 2026: first quarterly deadline.

Preparation in Lendlord – then compliance in the HMRC environment via the MTD Hub 

A practical prep list for busy landlords

1. Confirm you are in Phase 1. Check qualifying gross income against the thresholds above and the live GOV.UK guidance.
2. Finish Q1 digital records. Reconcile rent received, voids, repairs, insurance, agent fees, and allowable finance costs for 6 April to 5 July. Portfolio-level cash views help here. See portfolio management for landlords.
3. Keep evidence with the numbers. Invoices, statements, and tenancy documents should sit with the property file, not only in email. A dedicated document hub makes the pack easier to assemble.
4. Submit through compatible software. Register for MTD if needed, then send the quarterly update and store the receipt with your year-end pack.
5. Plan the Final Declaration early. Quarterly updates do not replace the January declaration. Build the habit now.

Software that is ready for the job

Landlord MTD hub – HMRC approved.

Spreadsheets alone are a weak base once you are mandated. You need software that can hold digital records and submit quarterly updates.

Lendlord is MTD-ready software for UK landlords and is approved by HMRC. That matters when you want rent, costs, and documents in one place, then a clean path to the August submit without rebuilding the books from scratch. You can explore Lendlord’s Making Tax Digital (MTD) tools, or create a free account to get set up.

If you want to see the HMRC connection and a live quarterly filing demo before August, register for the MTD Hub webinar (speakers include Aviram Shahar, Co-Founder and CEO of Lendlord, and Kevin Sefton, CEO at untied).

Soft tip for portfolio landlords: Do one property fully before you scale the process across the portfolio. Clean mapping of income and expenses on a single let teaches you where bank feeds, agent statements, and repair invoices usually break. Then roll the same method to the rest of the stock.

Bottom line

For Phase 1 landlords, 7 August 2026 is the first MTD quarterly deadline that counts. Cover 6 April to 5 July, submit MTD through HMRC compatible software, and keep later quarters and the Final Declaration on the calendar.