Best Invoicing Apps for UK Freelancers (2026)

Finding the right invoicing tool as a UK freelancer is surprisingly tricky. Most of the well-known options are either designed for US businesses (wrong currency, no VAT support), loaded with accounting features you'll never use, or charge monthly fees that eat into slim margins.

We've tested the leading options and rated them on what actually matters to UK freelancers. Here's the honest breakdown.

What we looked for

1. UK-first: GBP by default, VAT support, HMRC compliance out of the box
2. Speed: How quickly can you create and send an invoice?
3. Value: Quality of the free tier and fairness of paid plan pricing
4. Mobile usability: Works well on a phone for invoicing on the go

1. Invoice Kwik — Best overall for UK freelancers

Free plan available · Paid plans from £5/month · invoicekwik.uk

Built specifically for UK freelancers and sole traders, Invoice Kwik's standout feature is its AI-powered voice and text commands. Just say or type "Invoice ABC Ltd £800 for copywriting" and the invoice is created — HMRC-compliant, VAT calculated, ready to send. No forms, no menus, no clicking.

Pros:

1. Voice and text commands — fastest invoice creation on the market
2. 100% UK-built, HMRC-compliant invoices by default
3. GBP and VAT handling from day one, no configuration needed
4. Genuinely useful free tier (3 invoices per month)
5. No learning curve — if you can send a text message, you can use it

Cons:

1. No full accounting suite (intentionally — it does invoicing extremely well)
2. Newer product with a smaller review base than established tools

Best for: Freelancers, tradespeople, sole traders, and contractors who want to invoice fast and get paid faster.

2. FreeAgent — Best for limited companies

Free with NatWest/RBS business account · From £19/month otherwise · freeagent.com

A full-featured accounting and invoicing platform popular with UK freelancers and limited companies. Strong on Making Tax Digital compliance, Self Assessment support, and tax return preparation. If you bank with NatWest or RBS, you get FreeAgent free as part of your business account — which makes it exceptional value.

Pros:

1. Full accounting suite, not just invoicing
2. MTD-ready for VAT and Self Assessment
3. Free if you bank with NatWest or RBS
4. Excellent UK tax support and HMRC integration

Cons:

1. Overkill if you only need invoicing
2. Steeper learning curve than simpler tools
3. Expensive at £19/month if you don't qualify for the free tier

Best for: Limited companies and freelancers who need full accounting alongside invoicing.

3. Xero — Best for growing businesses

From £16/month · xero.com

Enterprise-grade accounting software that's become very popular with UK SMEs. Excellent integrations and powerful reporting, but considerably more than most freelancers need or want to pay for.

Pros:

1. Powerful integrations ecosystem
2. Strong reporting and cash flow forecasting
3. Good accountant collaboration features

Cons:

1. Expensive for solo freelancers — hard to justify the monthly cost
2. Complex UI that takes time to learn
3. No free tier

Best for: Growing businesses with an accountant who already uses Xero.

4. QuickBooks Self-Employed — Decent budget option

From £8/month · quickbooks.intuit.com

Popular and affordable, with decent UK VAT support. Originally US-focused but now reasonably well adapted for UK sole traders. Good mileage and expense tracking if you need it alongside invoicing.

Pros:

1. Affordable entry price
2. Good mileage and expense tracking
3. Solid mobile app

Cons:

1. US origin means some UK features feel bolted on rather than native
2. No free tier
3. Customer support can be slow

Best for: Freelancers who want mileage and expense tracking alongside basic invoicing.

5. Zoho Invoice — Best free option

Completely free · zoho.com/uk/invoice

Zoho Invoice is genuinely free with no invoice limits and no credit card required. Part of the wider Zoho ecosystem, it has solid UK support including VAT. The UI is dated and takes some configuring for UK use, but the price is hard to argue with.

Pros:

1. Completely free — no hidden costs, no invoice limits
2. Reasonable VAT and HMRC support
3. Works on desktop and mobile

Cons:

1. UI is dated and clicks-heavy — takes longer than modern tools
2. Requires setup time to configure correctly for UK VAT
3. No AI or voice features

Best for: Freelancers on a tight budget who don't mind an initial setup process.

At-a-glance comparison

Our verdict

For most UK freelancers — especially tradespeople, designers, consultants, and contractors — Invoice Kwik hits the best balance of speed, UK compliance, and price. The AI voice and text feature is genuinely unique and meaningfully faster than any competitor we tested. Note that HMRC integration is currently limited to quarterly VAT returns — if you need full MTD or Self Assessment support, pair it with your accountant's preferred tool.

If you're a limited company with complex accounting needs or an existing accountant relationship built around a specific tool, FreeAgent or Xero are more powerful choices — though at considerably higher cost and with a steeper learning curve.

If budget is the absolute priority and you don't mind spending an hour on initial setup, Zoho Invoice is hard to argue with at £0 per month.

Try Invoice Kwik free — no credit card required.