The Best MTD Software for
UK Sole Traders

Choosing MTD software in 2026 is less about flashy features and more about three honest questions: is it recognised by HMRC today, does it cover the income types on your return, and are you paying for support you will actually use? This page compares the genuinely sole-trader-focused options, including where each one wins and where it loses, so you can pick without the marketing gloss.

The honest comparison table

What MTD for Income Tax actually demands

Before you weigh apps, understand the obligation. From April 2026, if your combined self-employment and property income tops £50,000 you must keep digital records and submit quarterly updates to HMRC, then a final declaration after year end. The threshold falls to £30,000 in April 2027 and £20,000 in April 2028. The test is on gross income, so a courier turning over £54,000 with £41,000 profit is in scope from day one. Whatever software you pick must handle quarterly cumulative submissions cleanly, because HMRC expects each quarter to carry your totals to date.

This is also the moment to get the basics of your tax position straight. For 2025/26 the personal allowance is £12,570, with basic rate 20% to £50,270, higher rate 40% to £125,140, and additional rate 45% above. The allowance tapers away between £100,000 and £125,140, creating an effective 60% marginal band that catches higher-earning sole traders out. Class 4 National Insurance runs at 6% between £12,570 and £50,270, then 2% above, with Class 2 settled through Self Assessment. If you trade in Scotland your code starts with S and you face six bands (19/20/21/42/45/48%); Wales uses a C code with rates currently matching the rest of the UK, and NIC is UK-wide. It is worth a quick tax code check before you file, because a wrong code silently distorts your figures.

Pie (pie.tax): free filing with paid human add-ons

Pie is HMRC-recognised and leans into a free Self Assessment filing model, charging only for one-off add-ons: a return check at roughly £59.99, a done-for-you service around £149, and access to tax assistants. It is built around the SA100 and its supplementary pages, so rental income, dividends and multiple freelance income streams are first-class citizens rather than afterthoughts. Pie has also picked up a "Best Tax App UK 2025" accolade, which reflects genuine polish.

Where Pie wins: it is recognised today, the core filing is free, and it covers a broad return. If you have a property page (SA105) with mortgage-interest relief restricted to a 20% tax credit, dividends within the £500 allowance, and a freelance side gig, Pie's breadth is a real advantage. Where it is less of a fit: if you want a single, automated month-to-month workflow rather than a return-centric experience, the model feels more like assisted filing than continuous bookkeeping.

Kletta: premium software plus a human bookkeeper

Kletta is Finnish-built, HMRC-recognised, and unapologetically premium at £19, £29 and £49 per month. The headline differentiator is people: paid tiers include a human UK bookkeeper and a Self Assessment review, plus a two-sided accountant channel. It covers CIS, property income and capital allowances, and the mobile experience is a "snap-and-forget" model designed to minimise manual entry.

Where Kletta wins: if you are a CIS subcontractor who deducts 20% (registered) or 30% (unregistered) and usually expects a refund through Self Assessment, having a human review your figures is reassuring. The same applies to landlords navigating capital allowances or the post-April-2025 world where the Furnished Holiday Lettings regime has been abolished. Where it loses: it is the most expensive option here, and for a single-income sole trader with simple expenses, you are paying for support you may rarely need. Run the numbers with our CIS tax calculator to see whether a refund alone justifies the monthly cost.

FreeAgent, QuickBooks Self-Employed and Coconut: the heavier incumbents

These are established, recognised tools, and that maturity counts. FreeAgent is broad and capable, sometimes free if you bank with NatWest, RBS or Mettle. QuickBooks Self-Employed is familiar and widely supported. Coconut bundles a business current account with tax tracking. The trade-off is that they are generally heavier, broader or pricier than a sole trader strictly needs, and the cheapest plans often arrive via bank bundles or promotional rates that step up later. If you want full invoicing, payroll-adjacent features or VAT returns (the VAT registration threshold is £90,000 on a rolling 12-month basis), these earn their keep. If you just need clean MTD filing, they can be overkill.

TapTax: low-cost, one-tap, built for Making Tax Digital

TapTax takes the opposite bet to the incumbents: do the sole-trader MTD job, do it cheaply, and do it on your phone. Pricing is freemium at £0, £4.99 and £9.99 per month, with open-banking auto-import, AI categorisation, receipt scanning and mileage tracking feeding a running tax estimate. The pitch is "Tap. File. Done." for quarterly updates.

The honest caveat: TapTax is MTD-compatible and built for Making Tax Digital, but HMRC production recognition is pending, whereas Pie and Kletta are recognised today. So the trade is real. If a name on HMRC's published list before you sign up is non-negotiable, that is a point for the recognised tools. If you value a free entry tier, the lowest paid prices in this comparison, and a genuinely one-tap mobile flow, TapTax is the focused choice. For sole traders with several income types, pairing TapTax with the multiple income calculator helps you sanity-check the full picture before you file.

How to choose in one minute

• Want a recognised name on HMRC's list today, for free, with broad income coverage? Look at Pie.
• Want a human bookkeeper and a reviewed return, and happy to pay premium? Look at Kletta.
• Already deep in invoicing, VAT or a bank bundle? FreeAgent or QuickBooks may suit.
• Want the lowest price, a free tier, and one-tap mobile filing, and comfortable that TapTax recognition is pending? Shortlist TapTax.

There is no single winner for every sole trader. Recognised-today breadth (Pie, Kletta) and low-cost automation (TapTax) are genuinely different products solving the same deadline. Map your income types, your appetite for human support, and your monthly budget against the table above, and the right pick usually becomes obvious. Read more on the timeline in our MTD for sole traders guide.