DIY Accounting for UK Limited Companies
You're smart enough to run a business. You're smart enough to do your own accounts, with Finn alongside you.
AccountsOS makes DIY accounting for UK limited companies straightforward at £20/month. Finn, your AI accountant, handles VAT/MTD, Corporation Tax and receipt scanning automatically, with plain-English guidance throughout. Try free for 14 days.
Traditional Cost
Free (spreadsheets) + risk + time
AccountsOS
£20/month with Finn as your safety net
You Save
Peace of mind included
Free for 14 days • No credit card required
Sound familiar?
Feeling like you need an accounting degree to manage your books
Spreadsheets that are one formula error away from disaster
Not knowing if you're doing it right until HMRC tells you otherwise
Wanting to DIY but lacking confidence
There's a better way
AccountsOS makes DIY accounting achievable. Finn explains what to do and why, catches your mistakes before they matter, and handles the technical stuff like VAT calculations and Corporation Tax returns automatically. You stay in control. Throw receipts at Finn via photo, WhatsApp or email and it keeps the books in order. You just get a ping when something needs your eye.
Finn explains everything in plain English
Built-in error checking and warnings
VAT calculated and filed for you automatically
Corporation Tax prepared with guidance
Receipt scanning removes data entry
Real-time dashboard shows your position
AccountsOS vs DIY spreadsheets
| Feature | AccountsOS | DIY spreadsheets |
|---|---|---|
| Monthly cost | £20/month, all-in | Free + hours of your time |
| Who does the data entry | Finn reads receipts and bank feeds | You, manually |
| Receipt handling | Photo, email or WhatsApp, done instantly | Manual entry or scanning |
| VAT/MTD filing | Automatic, filed direct to HMRC | Manual spreadsheet, separate tool |
| Deadline tracking | Companies House + HMRC auto-synced | Your own calendar or diary |
| Getting answers | Ask Finn in plain English, instant | Google or pay an accountant |
| Error checking | Finn flags issues before you file | None until HMRC writes to you |
Perfect for
First-time directors who want to understand their finances
Spreadsheet users ready to level up
Control-conscious founders who don't trust black boxes
DIYers who want a safety net, not a nanny
Frequently Asked Questions
Is DIY accounting legal for limited companies?
Yes. There's no legal requirement to use an accountant in the UK. You can prepare and file your own accounts, VAT returns, and Corporation Tax returns. Many directors do, successfully.
How hard is DIY accounting for a limited company?
With the right tools, not hard. The main challenges are categorising transactions correctly, calculating VAT and Corporation Tax, and meeting deadlines. AccountsOS handles all three with Finn's AI assistance. You make decisions, Finn does the maths.
What if I get my DIY accounting wrong?
AccountsOS catches common mistakes before you file. Finn warns about categorisation errors, highlights potential compliance issues, and explains HMRC rules. If you do make an error, you can amend returns. It's not the end of the world.
Should I start with DIY then get an accountant later?
Many founders do exactly this. DIY accounting with AccountsOS teaches you how your finances work. If you scale to the point where you need specialist advice, you'll be a better client because you understand your numbers.
Ready to save Peace of mind included?
Join UK founders who've switched to smarter, more affordable accounting.
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