Best Accounting Software for Contractors UK

Contractors in the UK sit in an unusual accounting space. You are not a typical sole trader selling products or services to the general public. You work on contracts — sometimes long-term, sometimes project-based — and your accounting needs revolve around tracking income from a small number of clients, managing IR35 implications, claiming legitimate expenses, and keeping HMRC satisfied.

Most accounting software treats you like a miniature company. You end up paying for inventory management, purchase orders, and multi-currency invoicing you will never use. Meanwhile, the things you actually care about — accurate tax estimates, IR35 documentation, CIS deduction tracking, and painless Self Assessment — are either missing or poorly implemented.

Here is how the main options compare for UK contractors in 2026.

What Contractors Need From Accounting Software

Before comparing platforms, it helps to list what actually matters to contractors specifically.

Accurate Tax Estimates

As a contractor, your income can vary significantly between contracts. Your software should calculate your Income Tax, National Insurance, and payments on account in real time, updating as your income changes throughout the year. This prevents the shock of an unexpected tax bill.

IR35 Documentation

If you work through a limited company or as a sole trader providing services to clients, IR35 is always in the background. While your accounting software cannot determine your IR35 status, it should help you maintain the documentation that supports your position — contracts, substitution clauses, working arrangements, and evidence of being in business on your own account.

CIS Support

If you work in construction, the Construction Industry Scheme means your clients may deduct 20% or 30% from your payments and pay it directly to HMRC on your behalf. Your software needs to track these deductions accurately so you can reclaim any overpayment through Self Assessment.

Expense Tracking

Contractors have specific allowable expenses — travel to temporary workplaces, professional subscriptions, tools and equipment, training related to current contracts, and home office costs. Your software should categorise these correctly and help you claim everything you are entitled to.

MTD Compliance

Making Tax Digital is now live for those earning over £50,000. If you are a sole trader contractor above this threshold, you need HMRC-recognised software for quarterly submissions. Our Making Tax Digital guide explains the requirements in detail.

The Best Accounting Software for Contractors

1. Accounted — Best for AI-Powered Contractor Bookkeeping

Price: From £12/month | MTD: Yes | CIS: Yes | IR35 documentation: Partial

Accounted handles contractor-specific requirements well. The AI bookkeeper Penny categorises contractor expenses automatically — travel, equipment, professional subscriptions, and subcontractor payments are all handled. For construction contractors, CIS deduction tracking is built in, with Penny tracking the gross payment, deduction amount, and net payment received for each CIS transaction.

The WhatsApp integration is particularly useful for contractors who work on-site. Photograph a receipt for materials or a hotel bill, send it to Penny, and the categorisation and matching happen automatically. No need to log into a portal at the end of a long day.

Tax estimates update in real time, accounting for CIS deductions already made on your behalf. This means you always know your actual tax position — not just what you owe in total, but what you owe after CIS deductions are offset.

Strengths: AI categorisation for contractor expenses, CIS tracking, WhatsApp receipt capture, real-time tax estimates, MTD-native Weaknesses: IR35 documentation is limited, no invoicing yet, UK only

Explore our features or sign up for a free trial.

2. FreeAgent — Best Free Option for Contractors

Price: £14.50/month (free with NatWest/RBS) | MTD: Yes | CIS: Limited | IR35 documentation: No

FreeAgent is a strong all-round platform, and the free access through NatWest makes it an attractive option for budget-conscious contractors. The time tracking and project management features are useful for contractors billing by the hour or tracking time across multiple contracts.

CIS support is basic — you can track CIS deductions manually, but there is no automated calculation or contractor verification. For non-construction contractors, this is not a limitation. For construction workers, it means extra manual work.

Strengths: Free with NatWest, time tracking, project management, good tax estimates Weaknesses: Limited CIS support, no IR35 documentation, manual categorisation

We compare these in detail in our Accounted vs FreeAgent review.

3. Xero — Best With a Contractor Specialist Accountant

Price: £15–£47/month | MTD: Yes | CIS: Via add-ons | IR35 documentation: Via accountant

Xero is the platform most accountants use, and if you work with an accountant who specialises in contractors, Xero plus their expertise is a powerful combination. The accountant handles IR35 documentation, CIS returns, and tax planning, while Xero keeps the books in order.

For contractors managing their own accounts, Xero's complexity can be a barrier. CIS support requires add-on software, and the pricing is steep for sole traders who do not need the full feature set.

Strengths: Universal accountant support, strong ecosystem, reliable bookkeeping Weaknesses: Expensive for sole traders, CIS requires add-ons, complex interface

Read our Accounted vs Xero comparison for a detailed breakdown.

4. QuickBooks — Best for Contractors With Invoicing Needs

Price: £12–£32/month | MTD: Yes | CIS: Yes (higher plans) | IR35 documentation: No

QuickBooks handles CIS on its higher-tier plans, with automated CIS deduction calculations and HMRC submissions. The invoicing features are strong, which matters if you invoice your clients directly rather than working through an agency.

The Self Employed plan at £12/month is basic but functional for straightforward contractor setups. The limitation is that CIS support is only available on the more expensive plans, and the upgrade path from Self Employed to the main QuickBooks product involves some disruption.

Strengths: CIS on higher plans, good invoicing, solid mobile app, reasonable pricing Weaknesses: CIS needs higher tier, Self Employed plan is limited, US-centric design

See our Accounted vs QuickBooks comparison.

5. Sage Accounting — Best for Established Contractors

Price: £12–£26/month | MTD: Yes | CIS: Yes | IR35 documentation: No

Sage has strong CIS support, including contractor verification and monthly return submissions. If CIS is your primary concern, Sage handles it reliably. The UK support team is another advantage — getting help from someone who understands CIS regulations is valuable.

For general contractor accounting, Sage works well but is more complex than necessary for a sole trader with simple needs. The interface shows its enterprise heritage, and you end up navigating around features you do not use.

Strengths: Strong CIS support, UK-based support, reliable, established brand Weaknesses: More complex than necessary, not contractor-focused, mid-range pricing

We compare Sage and Accounted in our Accounted vs Sage review.

6. Crunch — Best for Contractors Who Want Full Accountancy Service

Price: From £79.50/month | MTD: Yes | CIS: Yes | IR35 documentation: Yes

Crunch is not software alone — it is a managed accounting service that bundles software with access to a dedicated accountant. For contractors, this means someone handles your CIS returns, advises on IR35 status, files your Self Assessment, and answers questions throughout the year.

The trade-off is cost. At £79.50+ per month, Crunch is significantly more expensive than software-only options. But if you want human oversight and expertise — particularly around IR35 — the peace of mind can be worth the premium.

Strengths: Dedicated accountant, IR35 advice, full CIS management, hands-off approach Weaknesses: Expensive, less control over your own accounts, locked into their service

CIS: A Closer Look

The Construction Industry Scheme affects a large proportion of UK contractors. If your clients are construction companies, they are likely deducting CIS from your payments. The standard deduction is 20%, but if you are not registered for CIS or do not provide your UTR, the rate jumps to 30%.

Your accounting software needs to:

1. Track gross payments, deductions, and net amounts for every CIS transaction
2. Record CIS deductions as tax credits so they offset your Income Tax bill
3. Handle materials correctly — CIS deductions apply to the labour element only, not materials
4. Support CIS tax reclaims through Self Assessment

Accounted, Sage, and QuickBooks (higher plans) handle CIS natively. FreeAgent and Xero require workarounds or add-ons. If CIS is central to your work, this should be a primary factor in your decision.

For a deeper dive into CIS requirements, read our Construction Industry Scheme guide.

How to Choose

Choose Accounted if you want AI-powered bookkeeping that understands contractor expenses and CIS deductions. Penny handles the categorisation, receipt scanning, and tax calculations automatically. Try it free.

Choose Crunch if you want a dedicated accountant managing your finances and providing IR35 advice. Be prepared to pay significantly more for this service.

Choose Sage if CIS is your primary concern and you want established, reliable CIS functionality with UK-based support.

Choose FreeAgent if you bank with NatWest and do not work under CIS. The free access and solid general features make it a strong choice for non-construction contractors.

Choose Xero if you already work with an accountant who specialises in contractors. The accountant plus Xero combination is well-proven.

For a broader comparison beyond contractor needs, see our best bookkeeping software guide. The right software depends on whether you work under CIS, how complex your IR35 situation is, and how much you want to manage yourself versus delegating to an accountant or AI.

Useful Resources

• HMRC's list of MTD-compatible software
• Making Tax Digital requirements

See how Accounted compares to Xero, Sage, QuickBooks and more — and why sole traders are switching. See the full comparison →