How MTD IT works for accounting practices

What is MTD IT and who does it affect?

Making Tax Digital for Income Tax Self Assessment (MTD IT) is HMRC’s programme to replace the annual Self Assessment return with digital record-keeping and quarterly submissions. The rollout is phased by income threshold:

Qualifying income means gross receipts from sole trading and UK property income combined, not taxable profit. A landlord with two properties and a part-time self-employed income could cross the £50,000 threshold without realising it.

This blog is part of our series, Making Tax Digital for Accountants: Your Complete MTD IT Compliance Guide.

Roughly two-thirds of MTD for ITSA registrations have been made by agents and accountants signing up on behalf of clients, which means the implementation burden sits mostly with the practice.

How does the MTD IT submission process work?

MTD IT replaces the annual Self Assessment return with a four-step annual process:

1. Quarterly updates: Four submissions per tax year that summarise the client’s income and expenses for that quarter.

2. Final declaration: This replaces the Self Assessment return, and is the formal confirmation of the client’s total tax position for the year.

3. Tax payment: The payment on account and balancing payment structure stays the same, with the 31st of January deadline unchanged. MTD IT changes the reporting cycle, but not the payment timeline.

What are the key quarterly deadlines for the 2026/27 tax year?

Quarterly submission deadlines are fixed regardless of when the client’s accounting period falls:

HMRC won’t be penalising late submissions during the 2026/27 tax year. From 2027/28 onwards, a £200 fine applies after four missed quarterly deadlines.

What does this mean operationally for a practice?

Instead of one annual return per client, the practice is now managing four quarterly submissions and a final declaration. For a practice with 100 MTD-eligible clients, that’s potentially 400 quarterly updates and 100 final declarations per year, and that’s on top of compliance work that was already there.

The practices that absorb this without expanding headcount are the ones with two things in place:

1. A clean way for clients to get their income and expense records into the system throughout the quarter

2. A submission workflow that runs as a managed process rather than a series of individual tasks

That’s where the right software earns its keep. For further information, check out our blog on what is the best cloud accounting software for MTD ITSA compliance in the UK?

How does BrightBooks by Bright handle the quarterly record-keeping?

The core challenge of MTD IT isn’t the submission itself, it’s getting clean, complete records in place before each quarterly deadline. BrightBooks by Bright is Bright’s cloud bookkeeping platform, built to maintain the digital quarterly MTD IT records that HMRC requires. Income and expenses are recorded and categorised throughout the year, so each quarter-end isn’t a scramble to reconstruct what happened. The data’s already there, ready to submit. For further information, check out our blog on how BrightBooks supports MTD IT.

What is BrightBooks' document capture tool and how does it help with quarterly returns?

One of the biggest friction points in quarterly record-keeping is getting clients to provide their expense data in a usable form without delay. BrightBooks' document capture tool by Bright, which is an MTD IT tool, removes that friction. Clients photograph receipts and invoices on their phone, and BrightBooks' document capture tool pulls receipt data like date, supplier, etc. and feeds it directly into BrightBooks. This means no more chasing for a shoebox of receipts at quarter end.

For sole traders and landlords who weren’t keeping records digitally before MTD IT, BrightBooks' document capture tool is the lowest-friction route to compliance. The client simply takes a photo, and that’s their end done. For practices managing a large MTD IT portfolio, that automation across a range of clients is the difference between quarterly deadlines being routine versus a quarterly fire drill.

Where does BrightTax by Bright fit in?

While BrightBooks handles the quarterly record-keeping and submission layer, BrightTax by Bright handles the year-end work. Once the quarterly updates are complete, BrightTax pulls the full-year figures together, allows for the adjustments and reliefs the client is claiming, and manages the final declaration to HMRC.

The result is a connected workflow:

• BrightBooks' document capture tool handles data capture

• BrightBooks maintains the live digital records and quarterly submissions

• BrightTax closes out the tax year

How does the Bright MTD suite compare to Xero and QuickBooks?

Xero covers bookkeeping and MTD submissions well for its compatible tiers, but it doesn’t include a receipt-capture tool or a full practice tax platform as part of the same suite. QuickBooks has solid self-employed MTD support at a competitive price point, but similar gaps at the practice management and tax layer.

The Bright suite is differentiated by covering the full workflow natively. Client-level capture with BrightBooks' document capture tool, digital records and quarterly submissions with BrightBooks, and year-end tax with BrightTax, without requiring the practice to stitch together tools from separate vendors.

BrightBooks by Bright has been built to make quarterly MTD record-keeping manageable at scale. Visit the Bright MTD hub for a full breakdown, or check out a demo below to see the workflow in action.

This content may have been developed with the assistance of AI tools. Content is reviewed by a member of the Bright team before publication. Guidance on legislation can be obtained from your industry body.