Free Invoicing & Accounting Software for the United Kingdom
BusinessOS is free accounting software UK freelancers, sole traders, and Ltd company directors use for daily invoicing and bookkeeping. MTD accounting software structure ready for Making Tax Digital hand-off to HMRC. 20% VAT built in, GBP currency, and encrypted end-to-end. Free during limited early access — no card, no invoice cap.
Whether you're a sole trader, a Ltd company director, or a freelance consultant looking for accounting software UK — BusinessOS gives you invoicing, expenses, customer CRM, and cash flow reports without a monthly subscription.
Start invoicing free →UK tax compliance features
- 20% VAT rate applied automatically
- VAT number field for buyer and seller
- GBP currency and £ formatting throughout
- Data structure suitable for MTD (Making Tax Digital) hand-off
- Sole trader income and expense tracking
- Ltd company support
- CSV export for accountants using Xero, QuickBooks, or FreeAgent
Cities and regions served
BusinessOS works everywhere with an internet connection to sign up — and fully offline after that. Currency, tax, and language settings adapt to your location. Popular cities:
- London
- Birmingham
- Manchester
- Leeds
- Glasgow
- Liverpool
- Newcastle
- Sheffield
- Bristol
- Edinburgh
- Cardiff
- Belfast
- Nottingham
- Southampton
- Brighton
- Reading
Built for these industries
- Freelance consultants, developers, designers, and marketers
- Sole traders and Ltd company directors
- Creative agencies and boutique studios
- E-commerce merchants
- Cafes, restaurants, and food businesses
- Retail shops
- Tradespeople (plumbers, electricians, builders)
- Photographers and creative professionals
- Coaches and independent therapists
- Legal and medical solo practitioners
Complete feature set
- Unlimited invoices and quotations
- One-click quote-to-invoice conversion
- Expense tracking with receipts
- Customer CRM with pipeline and trust scoring
- Product and inventory management
- Cash flow forecasting and tax set-aside
- P&L, balance sheet, and tax reports
- Multi-currency with automatic conversion
- Voice invoicing (English + Arabic)
- One-tap WhatsApp send on every invoice
- PDF export with your branding
- Zero-knowledge encryption
- Works fully offline
- Installs as a native app on any device
Privacy first
BusinessOS stores your data with zero-knowledge encryption. Everything is encrypted on your device with AES-GCM using a key derived from your password. If our servers are ever breached, an attacker only gets encrypted noise — not your revenue figures, customer list, or bank details.
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