Best Invoicing Software for Sole Traders UK 2026

Introduction

For many sole traders, invoicing is the most important financial task. You do the work, you send an invoice, you get paid. The right invoicing software makes this process quick, professional, and reliable. The wrong software adds friction, delays payments, and creates admin headaches.

This guide compares the best invoicing options for UK sole traders in 2026, covering dedicated invoicing tools and accounting platforms with strong invoicing features.

What Good Invoicing Software Should Do

At a minimum, you need to create professional-looking invoices with your branding, send invoices by email, track which invoices are paid and which are outstanding, send payment reminders, accept online payments to speed up collection, handle VAT correctly for VAT-registered businesses, and generate reports on outstanding amounts.

Beyond the basics, features like recurring invoices, estimates that convert to invoices, and automatic reconciliation with bank transactions add genuine value.

FreeAgent

FreeAgent has some of the best invoicing for UK sole traders. You can create branded invoices, set up recurring invoices, convert estimates to invoices, track time and bill it, and send automated payment reminders. The interface is clean and the workflow is logical.

FreeAgent also connects invoices to your broader bookkeeping. When a payment arrives, it matches to the invoice and updates your books. The Self Assessment integration means invoiced income flows through to your tax calculations automatically.

Pricing: approximately £19 per month plus VAT, or free with NatWest banking.

Invoicing verdict: excellent. One of the best invoicing experiences for UK sole traders.

Xero

Xero's invoicing is polished and feature-rich. Custom templates, recurring invoices, online payment acceptance (via Stripe, GoCardless, or PayPal), multi-currency support, and automated reminders. The Starter plan limits you to 20 invoices per month, but the Standard plan removes this limit.

Xero's invoicing integrates with its broader accounting features, so payments automatically reconcile. The accountant ecosystem means your accountant can see your invoice status alongside your other financial data.

Pricing: from approximately £15 per month (Starter, limited) to £30 per month (Standard, unlimited).

Invoicing verdict: excellent, particularly if you need multi-currency or high invoice volumes.

QuickBooks

QuickBooks offers good invoicing across its plans. You can create and send invoices, set up recurring billing, track payments, and accept online payments. The Self-Employed plan includes basic invoicing, while higher plans add more customisation.

The mobile app allows you to create and send invoices on the go, which is useful for sole traders who need to invoice from job sites or between meetings.

Pricing: from approximately £8 per month (Self-Employed) to £35 per month (Plus).

Invoicing verdict: good, with the best value at the Self-Employed tier.

PayPal Business

PayPal's invoicing is often overlooked but is genuinely useful for sole traders. You can create and send professional invoices, accept payments directly through PayPal, and track payment status. The invoicing itself is free; PayPal charges transaction fees on payments received.

The advantage is that many clients already have PayPal accounts, which can speed up payment. The disadvantage is that PayPal invoicing does not integrate with your bookkeeping unless you use additional software.

Pricing: free to send invoices. Transaction fees apply to payments.

Invoicing verdict: good for simplicity, limited for accounting integration.

Stripe Invoicing

Stripe Invoicing is designed for businesses that accept card payments. You can create invoices, accept online payments, and set up recurring billing. The invoices are clean and professional.

Stripe charges per invoice (currently around 0.4% of the invoice amount) plus standard payment processing fees. For high-value invoices, this can be more economical than percentage-based pricing.

Pricing: per-invoice fee plus payment processing.

Invoicing verdict: good for businesses already using Stripe. Less suitable as a standalone solution.

Invoice Ninja

Invoice Ninja is an open-source invoicing platform with a generous free tier. You can create branded invoices, track payments, manage expenses, and accept online payments. The paid plans add more features and white-labelling.

It is more of a dedicated invoicing tool than a full accounting platform, which means you would need separate bookkeeping software.

Pricing: free tier available. Paid plans from approximately £8 per month.

Invoicing verdict: good value if invoicing is your primary need.

Accounted

We will be transparent here. Accounted's invoicing module is currently in development. If invoicing is your primary requirement right now, the platforms above offer more mature solutions.

Where Accounted adds value is in the broader bookkeeping context. When invoicing launches, invoiced income will automatically flow through to your tax calculations, Penny will track payments and alert you to overdue invoices, and reconciliation with bank transactions will happen automatically.

In the meantime, many Accounted users pair a simple invoicing tool (like PayPal or Stripe Invoicing) with Accounted for their bookkeeping and tax management. Accounted picks up the incoming payments through bank feeds and categorises them correctly.

Pricing starts at £14 per month. See our pricing page.

Invoicing verdict: not yet a standalone invoicing solution, but works well alongside dedicated invoicing tools.

Getting Paid Faster

Regardless of which software you use, these practices help you get paid faster. Send invoices immediately after completing work. Include clear payment terms (14 days is standard for sole traders). Offer online payment options (card, bank transfer, PayPal). Send reminders automatically before the due date. Follow up promptly on overdue invoices. Consider offering a small discount for early payment on large invoices.

The Integration Question

The best invoicing experience comes when your invoicing is connected to your bookkeeping. When a client pays an invoice, the payment should automatically reconcile with your bank transaction and update your financial records. This eliminates double-entry and ensures your books are always accurate.

Platforms like FreeAgent, Xero, and QuickBooks handle this natively. If you use a standalone invoicing tool, you need to ensure the data flows through to your bookkeeping somehow.

Our Recommendation

For the best standalone invoicing experience, FreeAgent (especially if free through NatWest) or Xero offer the most polished solutions for UK sole traders.

For the cheapest option with decent invoicing, QuickBooks Self-Employed at £8 per month covers the basics.

For the best overall bookkeeping experience with invoicing handled separately, Accounted for AI-powered bookkeeping paired with a simple invoicing tool gives you the best of both worlds until Accounted's own invoicing module launches.

Sign up for Accounted and get your bookkeeping sorted while you choose the invoicing tool that works best for you.