Every package that can submit a VAT return has passed the same test: HMRC recognises it, or it cannot submit at all. That makes compatibility a threshold rather than a differentiator, and it is why comparing MTD software on the ability to file tells you almost nothing. What actually separates them is what happens either side of the submission, and that is where the choice should be made.
The four things that differ
How your records get in: a bridge that reads a spreadsheet, a ledger with bank feeds, or manual entry. How many registrations one licence covers, which decides it immediately if you run two businesses. What happens when a figure is wrong, meaning whether you can see the transactions behind each box or only the nine totals. And what you can get out again, because an export you can hand to an accountant is the difference between changing software next year and being stuck. Everything else is presentation.
Why a sole trader's answer is usually different
A sole trader with one bank account, a handful of monthly invoices and records already in a spreadsheet is not buying a ledger. The whole job is getting nine totals from the spreadsheet to HMRC through a digital link, and a bridge does that for a fraction of a full package. The moment that stops being true is the moment the spreadsheet stops being reliable: several income streams, stock, a second person entering data, or purchases that need coding at more than one rate. At that point the ledger is buying you the record, not the filing.
Where the cheapest stops being the cheapest
Free and near-free tiers usually mean one VAT registration, one submission route and no support, and some are free only under a turnover cap. None of that matters until the quarter it does. Read what happens at the cap before you cross it rather than after, check whether support exists at all when a submission is rejected on the deadline, and price the export: a package you cannot leave cheaply is a package whose price you have not finished paying. HMRC publishes the list of compatible software, and it is the only list that is authoritative about what can file.
Questions people ask about best mtd software
Is there one best MTD software?
No, because compatibility is a threshold everything on HMRC's list has already met. The right one depends on whether you need a bridge or a ledger, how many registrations you run, and how easily you can get your data out again.
What is the best MTD software for a sole trader?
For a sole trader whose records are already a reliable spreadsheet, bridging software usually is: it does the one job MTD adds. A full ledger earns its price when the spreadsheet stops being reliable, not before.
Where can I check that a package can actually submit?
GOV.UK publishes the list of software compatible with Making Tax Digital for VAT. If a package is not on it, it cannot submit your return, whatever else it does well.