CIS gets bolted onto most UK accounting software as a tick-box feature, but there's a big gap between "we have a Less CIS column on invoices" and "we'll file your CIS300 to HMRC, generate Payment and Deduction Statements for every subbie you pay, and feed your own withheld deductions straight into Self Assessment". If you're running CIS both ways — paying subbies AND being paid by main contractors — that gap is expensive.
Six UK tools a sole trader subbie or small ltd contractor would genuinely consider in 2026: FreeAgent, QuickBooks Online, Xero, Sage Accounting, Clear Books, and the Sage 50 CIS module. Every one is HMRC-recognised for CIS. The difference is depth, audience and workflow.
Three questions before you pay for any of them:
Subbie only, contractor only, or both? If you're a sole trader receiving CIS-deducted payments, you need statements-in and reclaim-at-year-end — most tools handle this. If you're a small ltd paying your own subbies, you need to file CIS300 monthly to HMRC and issue Payment and Deduction Statements. That's where the field narrows. FreeAgent, QuickBooks, Xero, Sage Accounting, Clear Books and Sage 50 CIS all file CIS300. Many cheaper tools don't.
Does it feed your tax return? For sole traders, the question is whether CIS deductions you've recorded flow into Self Assessment automatically or whether you're re-entering totals. FreeAgent is strongest — income and CIS withheld feed directly into the SA section. For ltd companies, none of these file CT600 themselves; they hand your accountant a clean CIS ledger, which is what accountants actually want.
Mobile usability for on-site recording. Can you log a contractor payment with CIS deduction applied from your phone, or do you need a laptop? FreeAgent, QuickBooks and Xero handle CIS-tagged invoices and payments from the mobile app once CIS is set up on the web. Sage and Clear Books are more desktop-led. For a van-based subbie, this matters.
Clear Books and Sage 50 CIS are contractor-first tools — they do CIS300 filing and statements brilliantly, but if you're a pure subbie reclaiming at year-end, they're overkill. Hudson Contract (not included here) is a different category entirely: CIS outsourcing, not software, where someone else runs CIS for you. Worth knowing about if you really don't want to touch it, but out of scope for this comparison.
If you've already read our accounting software comparison, four of these names will look familiar — this page looks at them through a purely CIS-workflow lens, ignoring bank feeds, general bookkeeping and VAT features that don't affect CIS specifically.
Our pick
Best for solo subbies with 3-5 contractors and no accountant
FreeAgent — subcontractor-strong, CIS deductions feed directly into Self Assessment, plain-English tax language throughout. Often free if you bank with NatWest, Mettle or RBS. Ideal if you're a sole trader who wants tax and CIS handled without paying an accountant monthly.
Best for small ltd running CIS both ways
QuickBooks Online — CIS centre with direct CIS300 filing to HMRC, bulk Payment and Deduction Statement generation (up to 50 at once), first-class contractor AND subbie handling in one ledger. More complex to set up than FreeAgent but scales better for busier contractor work.
Best mobile CIS workflow for on-site recording
FreeAgent or Xero — both handle CIS-tagged invoices and payments from the mobile app once CIS is configured on the web. Xero has the edge on general mobile polish; FreeAgent has the edge on CIS-specific clarity.
Best for CIS-only contractors wanting lean, focused software
Clear Books — CIS is a first-class feature, not a bolt-on. Automatic CIS300 pre-fill, direct HMRC submission, bulk statement generation per subcontractor group. Smaller ecosystem than QuickBooks or Xero, but if your primary use case is contractor-side CIS, it's purpose-built.
Best with an accountant who already works in Sage
Sage Accounting or Sage 50 CIS — any UK construction accountant is comfortable in Sage, and the CIS modules are built for practice workflows including refunds and corrections. More expensive than alternatives, less mobile-friendly, but the easiest hand-off if your accountant is already Sage-native.
