The strange thing about UK freelancer invoicing in 2026 is how many freelancers are paying for tools they could be getting free. FreeAgent is free with Mettle business banking. Stripe Invoicing is free except for transaction fees you'd pay anyway when clients pay by card. Wave is free for invoicing entirely. Yet a meaningful chunk of UK freelancers are still paying £20-£40/month for dedicated invoice tools that do less than the free alternatives.
Freelancer and small-agency invoicing splits across three approaches: dedicated invoice tools (Bonsai, Invoice Ninja), accounting tools with invoicing built in (FreeAgent, Xero, QuickBooks), and payment-platform invoicing (Stripe Invoicing, GoCardless). The right answer depends on what you're trying to consolidate.
How to pick by your situation
UK sole trader / freelancer with Mettle account: FreeAgent (free with Mettle).
Want invoicing + payment + recurring billing: Stripe Invoicing (free, payment fees only).
Want simple invoicing for free: Wave (free for invoicing).
Want full freelancer toolkit (contracts, time, invoicing): Bonsai at £18-£35/month.
For most freelancers: FreeAgent if you have Mettle; Stripe Invoicing if you don't but want free invoicing with payment integration.
The four worth knowing
FreeAgent. Covered in detail in our accounting software article. For sole traders, FreeAgent's invoicing is excellent and integrates with the rest of the tax and accounting workflow. Free with Mettle business banking; £19/month standalone.
Stripe Invoicing. Free to use; you pay only the standard Stripe payment fees (1.4% + 20p on card transactions) when invoices are paid. Recurring billing supported. Direct integration with FreeAgent, Xero, QuickBooks. Free + transaction fees. The right answer for freelancers who want free invoicing with payment integration but don't have Mettle.
What's good: free to use, no monthly fee; card payment built in (clients can pay invoices instantly); recurring billing for subscription clients; strong UK / EU presence; API access for programmatic invoicing.
What's not good: card processing fees are meaningful on large invoices (1.4% on a £5,000 invoice is £70); less invoice customisation than dedicated tools; not full accounting — pair with separate accounting tool.
Wave. Free invoicing platform with basic accounting. UK availability is solid; reasonable for the price (which is zero). Payment fees per transaction.
Bonsai at £18-£35/month. Bundles invoicing with contracts, proposals, time tracking, expenses, taxes — designed for freelancers who want one tool for the whole admin workflow. The right answer if you genuinely want consolidated freelancer tooling.
How I'd actually pick
Sole traders with Mettle: FreeAgent. Free with the bank account.
Freelancers without Mettle who want free invoicing plus payment integration: Stripe Invoicing.
Freelancers wanting consolidated freelancer admin: Bonsai.
Businesses with proper accounting needs: Xero or QuickBooks (covered separately) — invoicing inside accounting beats invoicing as a standalone tool.
What I'd swerve: paid invoice-only tools (Invoice2go, etc.). Stripe Invoicing or Wave free tiers do the job for freelancers, and "looks slightly nicer" is rarely worth £20/month.
The hidden cost most freelancers miss
The invoice you don't send on time is the most expensive invoice in any freelance business. Tools matter less than the habit of invoicing weekly or monthly without delay. Whatever tool you pick, set up recurring calendar reminders. The £400 unpaid invoice from three months ago is more expensive than any monthly tool subscription you'll consider.
Affiliate disclosure: Morningfold has affiliate partnerships with FreeAgent, Stripe, Wave, and Bonsai — see editorial standards.