Making Tax Digital App: What Your Phone Can Actually Do
Not all Making Tax Digital apps are equal. Here's what a genuine MTD app should do on your phone, and what most charge you for that you'll never use.
April 2026 is closer than your next VAT return. If you are a sole trader earning above £50,000, HMRC's Making Tax Digital for Income Tax will be mandatory, and a Making Tax Digital app on your phone is the most practical way to stay compliant without hiring an accountant or learning spreadsheet macros.
But here is the problem: the app market for MTD is already cluttered with tools built for small businesses, accountancy firms, and limited companies, then retrofitted with a mobile skin and sold to sole traders as "simple". You end up paying for a dashboard full of features you will never open, while the one thing you actually need, a clean way to log income and expenses from your phone, is buried three menus deep.
This post is not a ranked list of software (we have covered Best Accounting Software Sole Trader UK 2026: Ranked and MTD Software for Self Employed: Are You Buying Too Much? elsewhere). This is a practical guide to what a Making Tax Digital app should actually do on your phone, what is marketing fluff, and how to judge any app against your real working day.
- A genuine MTD app must connect directly to HMRC's API and submit quarterly updates without a desktop detour.
- Receipt capture and automatic expense categorisation are the two mobile features that save real time for tradespeople.
- Most sole traders earning £50,000 to £80,000 need four quarterly updates and one end-of-year declaration per year, nothing more.
- Paying monthly for payroll, VAT returns, or multi-currency support is waste if you are a sole trader with UK clients.
- Test any MTD app against your busiest working day, not a demo environment with clean sample data.
- Making Tax Digital App
- A smartphone or tablet application that connects to HMRC's Making Tax Digital API, enabling sole traders and landlords to log income and expenses digitally, then submit quarterly updates and an end-of-year declaration directly to HMRC without using a desktop browser or paper records.
What HMRC Actually Requires From Your App
Before judging any Making Tax Digital app, it helps to know exactly what HMRC mandates, because the requirements are narrower than most software vendors imply.
Under Making Tax Digital for Income Tax Self Assessment (MTD ITSA), sole traders above the income threshold must:
- Keep digital records of all business income and expenses
- Submit four quarterly updates to HMRC each tax year
- Submit a final end-of-year declaration (replacing the traditional Self Assessment return)
That is it. HMRC does not require you to use a specific app, invoice inside the software, run payroll through it, or produce profit and loss reports in a particular format. The quarterly update is essentially a summary of income and expenses, categorised correctly, sent digitally to HMRC's systems.
So when an app's homepage leads with "invoicing, payroll, cashflow forecasting, and MTD compliance", ask yourself how much of that list applies to you. A sole trader plumber earning £65,000 a year, paid in cash and bank transfer, needs digital records and four submissions. The payroll module is irrelevant. The cashflow forecasting is a nicety. The multi-currency dashboard is noise.
The Four Things a Phone-First MTD App Must Do Well
1. Capture Receipts Instantly on Site
If you are an electrician or a handyman, you are not sitting at a desk after every job to log your expenses. You buy cable ties at a builder's merchant, shove the receipt in your pocket, and forget about it. A legitimate Making Tax Digital app earns its subscription fee by letting you photograph that receipt the moment you are back at the van.
Good receipt capture does three things: it reads the amount automatically using OCR (optical character recognition), it suggests an expense category, and it attaches the image to the transaction so you have proof if HMRC ever queries it. Poor receipt capture just stores a photo with no data extraction, leaving you to type in figures manually later.
Test this before you commit. Take a crumpled, slightly blurred receipt from a trade counter and see what the app makes of it. If it fails on that, it will fail on your real paperwork.
2. Categorise Expenses to HMRC's Approved Categories
HMRC's MTD system uses specific income and expense categories, and your quarterly submission must map to these. An app that uses its own internal categories and then silently translates them is a risk; translation errors can trigger queries. An app that shows you HMRC's actual categories (or at least maps transparently to them) gives you confidence that your submission is clean.
For sole traders, the core expense categories include materials, subcontractor costs, travel, vehicle running costs, premises costs, advertising and promotion, and administrative costs. A good Making Tax Digital app surfaces these clearly. A bad one hides them behind generic labels like "other outgoings" and leaves you guessing.
3. Submit Quarterly Updates Without a Desktop
This sounds obvious, but some apps still require you to log into a web browser to submit quarterly updates. The mobile app is merely a data-entry tool; the actual submission happens on a laptop. That is not a phone-first MTD app. That is a mobile front end bolted onto desktop software.
A genuine Making Tax Digital app handles the entire submission cycle on the phone: review the quarter's figures, check the totals, confirm, and send to HMRC. You should receive a confirmation reference number without ever opening a laptop.
4. Show Your Running Tax Estimate
This is the feature most sole traders actually want and most apps bury. If you can see, at any moment, roughly what your tax bill will be based on income logged so far, you can put money aside as you earn rather than scrambling in January. A Making Tax Digital app that shows a live tax estimate, updated every time you log a new invoice or expense, is doing something genuinely useful.
This connects to a broader point about cash flow. Our Sole Trader Tax Calculator UK: What Most Get Wrong post covers how to estimate your liability accurately, but a good MTD app should automate most of that thinking.
What the Expensive Apps Charge You For (That You Don't Need)
The major accounting software vendors, including Xero, QuickBooks, and FreeAgent, have all developed MTD-compatible apps. They are genuine products built by competent teams. But they are priced and structured for small businesses with employees, VAT returns, and complex balance sheets.
Here is a concrete example. A Xero Starter plan (the cheapest tier) currently costs around £16 per month. The next tier, required if you send more than five invoices a month, costs around £33 per month. For a sole trader submitting four quarterly updates a year to HMRC, that is over £390 annually for software that also manages multi-currency transactions, connects to Stripe, and produces consolidated group accounts. You are funding features designed for a business with a finance director.
As we explored in FreeAgent vs QuickBooks Self Employed: Stop Paying for Features You'll Never Use, the pattern repeats across the market. The software vendors have every incentive to sell you the full suite. MTD has given them a legislative mandate to reach millions of sole traders who previously filed once a year and needed nothing in between.
The question is not whether these apps are good. The question is whether they are proportionate to what you actually need.
The Red Flags to Watch in Any MTD App
"HMRC recognised" vs HMRC API-connected. Some apps claim HMRC recognition in their marketing but only use bridging software under the hood, importing from a spreadsheet rather than connecting directly via API. Check HMRC's published list of MTD-compatible software. If the app is not on it, it is not compliant regardless of what the marketing says. We have covered the risks of this approach in MTD Bridging Software: A Stopgap or a Trap?
Free trials that require a credit card. A confident software vendor does not need your payment details before you have submitted a single expense. Free trials gated behind billing information are a dark pattern designed to capture passive subscribers.
Mobile apps that redirect to a browser. Open the app, find the submit button, tap it. If it opens a web browser, you do not have a genuine mobile MTD experience.
No offline mode. You are on a building site with no signal. You need to log materials purchased five minutes ago before you forget. An app with no offline capability is not designed for tradespeople.
Pricing that changes after the trial. Get the post-trial monthly cost in writing before you commit. Several MTD apps use introductory pricing that increases after three to six months, sometimes doubling.
People also ask
How to Test Any Making Tax Digital App Before You Pay
Do not evaluate an MTD app in a demo environment. Vendors curate demos with clean data, fast connections, and perfect receipts. Evaluate it against your actual working conditions.
Run through this checklist during the trial:
- Photograph a real receipt from a trade supplier. Does the app extract the amount and date automatically?
- Log a cash sale from memory, two days after it happened. How many taps does that take?
- Find the quarterly submission screen. Can you complete a test submission without opening a browser?
- Check where the running tax estimate lives. Is it on the home screen or buried?
- Turn off your mobile data and try to log an expense. Does the app store it offline and sync later?
- Find the HMRC category list within the app. Are standard sole trader categories present and clearly labelled?
- Look up the cancellation process. Can you cancel within the app or must you email a support team?
If an app fails more than two of these in a trial, it will fail you during a busy quarter.
What a Purpose-Built MTD App Looks Like
The MTD app market has a gap at the bottom of the price range. The expensive end is dominated by full-suite accounting platforms. The free end is populated by tools that are technically MTD-compatible but provide minimal guidance and poor mobile experiences. In the middle, built specifically for sole traders who want compliance without complexity, is where purpose-built apps like TapTax operate.
A purpose-built Making Tax Digital app for sole traders should cost less than a takeaway coffee per week, connect directly to HMRC, work from a phone, and require no accounting knowledge to operate. It should not try to be your payroll system, your invoicing platform, or your cashflow forecasting tool unless you specifically need those things.
If you want to understand exactly what digital bookkeeping records HMRC requires underneath any app you use, Sole Trader Bookkeeping Requirements: What HMRC Actually Demands sets out the rules plainly. And if you are still working out when your MTD obligations actually start, When Do I Need to Start MTD? Your Deadline by Income has the specific dates by income band.
The One Question That Decides Which App You Need
Every sole trader shopping for a Making Tax Digital app should start with a single question: what does my working day actually look like?
If you are on site from seven in the morning, generating receipts, invoices, and cash payments throughout the day, the only thing that matters is how fast and reliably the app captures that information from your phone. Everything else is secondary.
If you spend significant time at a desk, manage subcontractors, or have genuinely complex finances, a more feature-rich platform might justify its higher price. But be honest about which category you fall into before signing up for a subscription.
April 2026 opened this post because that is when MTD ITSA becomes mandatory for sole traders above the £50,000 threshold. By the time that deadline arrives, you want to have been using your chosen Making Tax Digital app for at least two quarters, so the process feels routine rather than stressful. Starting in January 2026 is not early. Starting now is sensible.
Pick one app, run the checklist above during the trial, and make the decision in the next fortnight. The alternative is leaving it until March and making a panicked choice under pressure.
You might also like
Ready to simplify your tax filing?
Join the waitlist and be the first to know when TapTax launches.