Making Tax Digital for Income Tax wants sole traders/self-employed to keep records and report income to HMRC via compatible software.
Thus, the choice of software matters more than the monthly price suggests, because a poor fit costs a sole trader in lost time, higher accountancy fees and weaker control of their own figures.
This guide compares the five options built for a sole trader, RentalBux, QuickBooks, Xero, FreeAgent and Sage, and shows where each one is strong and where each falls short for a self-employed person specifically.
What a sole trader should look for in MTD software
The requirement is narrower than what a limited company or a VAT-registered business needs. Three things decide it:
A bank connection that pulls your transactions in. Most of your records are bank transactions, so an Open Banking feed that imports them automatically removes the largest recurring task.
Categorisation and receipt capture that work as you go. Rules that sort recurring transactions on arrival, and receipt capture that works from your phone, keep the evidence with the entry and the quarter close to done.
Accountant access that saves you at year-end. A shared login turns your year-end review into a check rather than a rebuild, which usually lowers the fee.
What does choosing the wrong MTD software actually cost a Sole Trader?
MTD for Income Tax is not a one-off task. You submit a quarterly update four times a year, then a final declaration, for as long as you trade.
The software you pick is one you work with every quarter, and the wrong one costs you well beyond its monthly price. The costs show up in four places:
The wrong software risks miscategorising your costs
Most software gives you a ready-made list of income and expense categories built for a general business rather than the way you actually trade.
An electrician logging tool and van costs under generic headings, or a hairdresser forcing stock and equipment spending into categories meant for someone else, makes it easier to misjudge which tax bucket a cost belongs to, particularly between capital and revenue spending.
That adds hours to your bookkeeping and your accountant's year-end review.
Software that does not record as you go turns every quarter into a scramble
Software that does not record your transactions as you trade leaves three months of bank activity to be found, sorted and categorised in the days before each deadline, four times a year.
That last-minute reconstruction is where entries get missed, expenses go unclaimed and updates are filed late or wrong.
The wrong software leaves your accountant rebuilding your records, at your expense
Disorganised or incomplete records mean your accountant has to rebuild your bookkeeping before they can file anything.
That means sorting unlabelled transactions, flagging missing receipts and querying entries that do not match the bank statement, rather than simply reviewing figures you have already categorised correctly.
That rebuild is billed on top of the return itself, and the fee rises with how disorganised the records are.
A shoebox of unsorted receipts and an unreconciled year of bank transactions takes an accountant considerably longer to untangle than a quarter's figures that just need a final check.
Software that hides your numbers leaves you guessing on business decisions
A spreadsheet stores figures but does not turn them into a running profit figure, so you are pricing jobs, planning spending and taking drawings without knowing where you actually stand.
Price too low against a cost base you have not properly tracked and the margin disappears before you notice.
Draw too much in a strong-looking month and the business may not have enough cash left to cover a tax bill or a supplier payment once outstanding costs come through.
The true position only appears when your accountant produces the accounts, well after those decisions were made and too late to change them.
Best MTD Software for a Sole Trader, Compared
RentalBux | QuickBooks Sole Trader | Xero Simple | FreeAgent | Sage Sole Trader Free | |
|---|---|---|---|---|---|
Entry price | £5.75/mo (1–3 properties) | £10/mo | £7/mo | Free via NatWest group, else £19/mo | Free |
Property and self-employment together | Native, one place | Single property | Higher plan | Separate accounts | Not on free tier |
Chart of accounts | Built for your trade | Generic to self-employment | Generic | Generic | Generic |
Bank connection | 50+ banks, Open Banking | One account | Open Banking | Open Banking | One account |
Profit and loss and balance sheet | Automatic | Basic reporting | Higher tiers | Yes | Thin on free tier |
Receipt and invoice capture | AI capture | Yes | Yes | 10/mo, then add-on | Limited |
Accountant access | Yes | Yes | Yes | Yes | Yes |
Invoice limit | No cap | No cap | 10/mo | No cap on paid | 5/mo |
Now let's discuss each of these software one by one.
RentalBux
Best for: Sole Traders or self-employed who also have property income, because it is the only HMRC-recognised platform covering UK property, foreign property and self-employment together, with no second system and no re-keying between them.
RentalBux is equally strong for a pure sole trader who wants their books to match their trade and their statements produced automatically, and at £5.75 a month it is the cheapest paid option from a named provider.
What a sole trader gets:
Property and self-employment income handled natively, in one place. A sole trader who also lets property runs both from the same records, where a general accounting tool forces a second system or a workaround the moment the second income appears.
A chart of accounts built for your trade. Select your line of work and the income and expense categories match it, so a private clinic records patient charges and a baker records ingredient costs rather than forcing them into generic lines. Add your own category wherever your trade needs one the list does not include.
Your profit and loss and balance sheet, produced automatically. Once your chart of accounts is mapped, RentalBux prepares both statements as you trade, so you see your real trading position each quarter rather than waiting for the year-end accounts.
Every figure on the balance sheet traces back to source. Any figure is clickable and links straight to the transaction it came from, so a number that looks wrong can be checked in seconds.
Bank feeds from more than 50 UK banks. A read-only Open Banking feed covers the high street names alongside Monzo, Starling, Revolut, Tide, Mettle and ANNA, and pulls transactions in on the schedule you set.
Rules that categorise transactions as they arrive. Set a rule once for a recurring supplier or subscription and every match is sorted from then on. Split a single payment across categories by percentage or exact amount.
Receipt and invoice capture from your phone. Photograph a receipt or upload a PDF invoice and RentalBux reads the supplier, amount and date and attaches it to the transaction.
Quarterly updates and the final declaration filed in one place. The records you keep feed the quarterly update and the final declaration, so record-keeping and MTD filing stay together.
Accountant access when you want it. Should you use an accountant, they log in under their own role and work from your mapped records rather than rebuilding them.
A sole trader with one to three properties pays £9.50 a month, once the trial ends in August 2026.
QuickBooks
Best for: Sole traders who spend more time on a job or on the road than at a desk. The mobile app is the most capable in this comparison, and the automatic mileage tracking suits tradespeople and anyone claiming vehicle costs.
QuickBooks Sole Trader is Intuit's entry product for the self-employed, at £10 a month plus VAT.
A strong mobile app with automatic mileage tracking. The phone experience is the best here, built for logging work as it happens.
A running Self Assessment tax estimate. QuickBooks shows your estimated tax as the year goes on, so the year-end figure is less of a surprise.
Receipt capture and a single bank feed. You can photograph receipts and connect one business bank account.
Its weaker point for a sole trader is the categorisation. It works from a chart of accounts generic to self-employment rather than shaped to your trade, and the AI categorisation Intuit markets on its higher tiers is not included at the Sole Trader level.
A clinic and a courier are sorted through the same standard categories, so the tailoring is left to you. It also connects to only one bank account and does not file VAT, which means a move up to Simple Start at £14 a month plus VAT once you register.
Xero
Best for: Sole traders who already work with an accountant, because Xero is the platform most UK practices use, so your books and theirs sit in the same system and your year-end costs less friction.
Xero Simple includes MTD for Income Tax at £7 a month, the lowest standard entry price from a major provider.
A low entry price within the largest accounting ecosystem. At £7 a month it is competitively priced for the platform most UK practices use.
Near-universal accountant familiarity. Most UK accountants know Xero, which saves them time at year-end and can lower your fee.
A clear upgrade path. Take on more income sources later and you move up a tier rather than migrating to a new product.
Its weaker point is that Simple is deliberately scaled down. It handles one income stream and caps you at 10 invoices a month, and its fuller reporting and a second income source only appear on higher tiers. A sole trader who bills more than ten clients a month, or who picks up rental income, pays up to Ignite at £16 a month to reach features a smaller tool includes as standard.
FreeAgent
Best for: Sole traders who bank with NatWest, Royal Bank of Scotland, Ulster Bank or Mettle, or who are willing to open a free Mettle account, because the full product comes free with the account for as long as you hold it.
FreeAgent is owned by NatWest Group, and the free version is the complete product, not a trial. Paid directly, it is £19 a month plus VAT for a sole trader.
The full product at no cost through the right bank. Bank feeds, invoicing, expense capture, Self Assessment filing and MTD submissions, all included.
A UK-built tool made for the self-employed. FreeAgent was built for freelancers and contractors, so its workflow fits a sole trader rather than a larger business.
Direct filing to HMRC. Quarterly updates, the final declaration and Self Assessment all submit from within the product.
Its weaker point is the two conditions attached. The free access lasts only as long as you hold the bank account, so switching banks returns you to the paid rate. And FreeAgent structures by business type, so a sole trader who also lets property needs two separate accounts, one as a sole trader and one as a landlord, each submitting to HMRC on its own, with the two tax positions never shown in a single combined view.
Sage
Best for: Sole traders with very few transactions who want free MTD software without opening a new bank account, since the free tier attaches no banking condition.
Sage Sole Trader Free is the bank-agnostic free option for a sole trader starting out.
Genuinely free with no bank tie. Unlike FreeAgent's route, there is no requirement to hold a particular bank account.
Digital records and a completed self-employment summary. It keeps your income and expenses digitally and produces the self-employment figures you need.
Room to upgrade. The paid tier at £7 a month lifts the free limits when you outgrow them.
Its weaker point is the free tier's hard caps: 5 sales invoices and 25 categorised transactions a month, with reporting beyond the basics kept thin.
A moderately active sole trader reaches those limits quickly and is pushed to the paid tier to carry on, so the free plan works best for very low volumes rather than steady monthly trading.
Two practical checks beyond Price and Features
Price and feature comparisons only tell part of the story. Two further questions decide how well the software fits once you are actually using it.
Moving your records over should not mean re-entering a year of data. If you are switching from a spreadsheet or another package partway through the tax year, the software needs to take your existing records in, not force you to start again from nothing.
RentalBux accepts a CSV or spreadsheet import alongside its bank feeds, so existing records carry over rather than being re-keyed.
QuickBooks, Xero and FreeAgent each support a CSV import, though mapping your existing categories to a new chart of accounts is manual work in all three.
Sage's free tier has the least support for migration, given its low monthly caps on new entries.
You should know a quarter is ready before the deadline forces you to check. A quiet dashboard is not the same as a quarter that is actually in order.
RentalBux shows a reconciliation status. When your bank balance matches your book balance, a £0 difference confirms the quarter is ready before the submission date, not on it.
QuickBooks shows a running tax estimate through the year, which signals your position but not whether the underlying records are reconciled.
Xero, FreeAgent and Sage confirm a submission once filed, but none surface a pre-deadline readiness check in the way RentalBux does.
The right time to switch is before your next quarter starts
MTD for Income Tax is not a single decision. It repeats every quarter for as long as you trade, so the software in place today carries every return that follows it.
Switching mid-quarter is possible with any of the five options here, but starting clean at the beginning of a quarter means you are not reconciling two systems for the same three months.
Choose the software that matches your trade and your income now, rather than in the week before your next update is due.
