Bookkeeping software only becomes urgent when something goes wrong. A laptop gives up the week before a VAT return is due. Your accountant asks for the year's records and you are emailing screenshots. Or you take on a second pair of hands and realise only one computer holds the file. Cloud accounting and desktop software both keep the books, but they behave very differently when real life intervenes. Here is how they compare on cost, access, backup and Making Tax Digital — the four things that actually affect your week.

The basic difference, in plain terms

Cloud accounting runs on the provider's servers. You log in through a browser or an app, and you pay a subscription monthly or annually. Your data sits with the provider and updates happen without you doing anything.

Desktop software is installed on a computer in your office or on a server you control. The data file lives on that machine. You typically pay a one-off licence, sometimes with an optional support plan, and you decide when to upgrade — usually by buying the next version.

Plenty of products blur the line now. Some familiar desktop names sell hosted versions, where the software runs on a remote machine you reach over the internet. It feels like desktop and prices like cloud. Worth asking which one you are being quoted for.

Cost: compare the whole picture, not the sticker

The headline price is the least useful number. A cloud subscription is a recurring cost that tends to climb as you add users, companies or modules. A desktop licence is a bigger upfront payment with smaller ongoing costs, but the savings can leak away through upgrades, backup arrangements, a machine capable of running it, and the time spent keeping it alive.

Ask these before you commit:

• What does it cost when a second or third person needs access?
• Are VAT returns, payroll and invoice chasing included, or charged separately?
• Is the desktop licence per user, per machine, or annual?
• What is the exit route? Can you export your data in a usable format without paying a fee?
• If you are VAT registered, can the software file returns directly to HMRC?

Then add the invisible costs. Moving from desktop to cloud means someone has to convert or re-key the file. Moving the other way may mean your accountant bills you for the time. A cheap tool your accountant cannot work with is rarely cheap.

Access, working patterns and collaboration

This is where cloud usually wins. If you spend your days on site, photographing receipts on your phone and reconciling them in the van is genuinely useful. Bank feeds pull transactions in without you typing them, and your bookkeeper and accountant see the same figures at the same time, which removes the annual shoebox.

Desktop holds up when the books are one person's job at one desk. A small manufacturer with a single office computer, a steady invoice run and a settled routine does not gain much from a subscription. It also suits places where broadband is patchy, because a local file does not care whether the internet is up.

If anyone else touches the numbers — a partner, a bookkeeper, an accountant — think hard before choosing something only one person can reach.

Backup and security: the question that catches people out

Cloud providers handle servers, backups and uptime. That does not remove your responsibilities. Use a strong, unique password, switch on two-factor authentication, and remove access for anyone who leaves. Check how you can export your data, and where it is held if you handle personal information, because data protection rules apply wherever the file sits.

With desktop, backups are yours. The common failure is painfully simple: the file and the backup sit on the same machine, the drive fails, and both are gone. If you stay on desktop, keep three copies, on two types of media, with one held off-site. Cloud storage for the backup file is a sensible option.

Cloud is not automatically safer than desktop, and desktop is not automatically insecure. The bigger risk is a business with no backup routine at all.

Making Tax Digital compliance

Making Tax Digital for VAT required VAT-registered businesses to keep digital records and file returns using compatible software, and that alone pushed many businesses towards cloud. MTD for Income Tax Self Assessment is being introduced in stages, but both the start dates and the income thresholds have changed more than once. Check HMRC's current guidance rather than relying on what you read last year.

Compatibility matters more than where the software sits. The real test is whether the product appears on HMRC's list of recognised software and can submit returns directly. Some older desktop packages cannot file digitally; bridging software can fill the gap but adds a step, and it still has to be compatible. If your current tool is not on that list, that is a sound reason to change.

When desktop still makes sense

There are honest cases for staying put:

• One user, one machine, a routine unchanged for years.
• Unreliable broadband, or a site with no connection at all.
• A contractual or regulatory reason to hold the file locally.
• Very simple bookkeeping where a monthly subscription is hard to justify.

Even then, check two things: whether your accountant can accept the file, and whether the software will keep pace with filing requirements. Choosing desktop today is not a life sentence, but migrating later usually costs more than migrating now.

How to decide in practice

1. Write down what you actually need: VAT returns, payroll, CIS, invoice chasing, number of users. Ignore features you will never open.
2. Ask your accountant or bookkeeper which products they can work with, and how they prefer to receive data.
3. Trial a cloud product with real transactions for a month. Import a bank statement, run a reconciliation, produce a VAT summary.
4. Confirm the exit route before you commit, and download a full backup of your current data today.
5. Review after twelve months. If you are paying for modules you do not use, move to a smaller plan.

If you are VAT registered, work with anyone else, or want your records available when you are away from the desk, cloud is usually the simpler default. If you are a sole trader with straightforward books, one computer and a disciplined backup habit, desktop can still serve you well.

Whichever you choose, the boring habits matter more than the badge on the software: reconcile the bank every month, attach receipts to transactions as you go, and back everything up. For anything specific to your tax position, particularly around MTD and your filing obligations, ask your accountant for advice tailored to your business.

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