Stage-payment deposits, CIS deductions, materials on the Travis Perkins account, subbies paid Friday in cash — and now HMRC wants it all digital, quarterly.. £495 one-time setup + £150/mo for full done-for-you compliance — software, quarterly submissions, year-end. ACMA CGMA qualified.
Get Your Free Readiness Check →No call required to start · 60-second form · Audience size in UK: ~85,000 sole-trader builders + general contractors caught by April 2026 MTD ITSA — average UK builder earnings vary widely (£28K-£70K+) depending on whether they take main-contractor risk or work CIS-subbed; the CIS-registered population alone exceeds 1.3m, of which a meaningful portion are sole traders billing £50K+ gross
UK self-employed builders carry the heaviest operational record-keeping burden of any trade caught by MTD ITSA. The combination of CIS deductions at source (both incoming and outgoing — many sole-trader builders are both subcontractors to main contractors AND contractors to their own subbies), high materials throughput, and stage-payment income recognition creates an MTD compliance picture that very few builders currently handle digitally. Typical pain: a small-builder doing a £45K loft conversion takes a £15K deposit at start, £15K at first-fix, £12K at second-fix, and £3K on completion sign-off (snagging retention). Each stage payment needs recording in the quarter received; materials are bought across all four stages from multiple suppliers; three subbies are paid CIS-deducted at different stages. Under the post-April-2026 individual-transaction digital records rule, that single project generates 60-100 individual digital records — and the typical sole-trader builder currently captures this entirely in a notebook + a shoebox of receipts. The shift is operationally radical, not just compliance-tidy.
These are different from a generic sole trader's. They're what catches uk self-employed builders at year-end if MTD ITSA isn't set up properly.
CIS deductions dominate the income picture — most sole-trader builders subbing to main contractors have 20% (or 30% if unregistered) withheld at source, and that withholding needs flowing through quarterly submissions correctly so they don't double-pay or under-pay at year-end.
Materials are 30-50% of the gross job value but financed by the builder upfront — Travis Perkins, Jewson, Selco, B&Q Trade accounts each generate dozens of monthly transactions, and the digital-records rule means every receipt is logged individually, not as a monthly summary.
Subcontractor relationships flip both ways — a sole-trader builder pays his own subcontractors (sparks, plumbers, plasterers) under CIS, deducting 20% at source if they're registered, and that creates a contractor-side reporting obligation separate from MTD ITSA.
Variations + extras on jobs straddle quarter boundaries — a £35K kitchen + extension that grows to £42K with mid-job variations needs the income recognition timing right (deposit, stage payments, snagging retention) so quarterly submissions reflect reality rather than just bank deposits.
Xero with the CIS add-on is the strongest fit for builders running both sides of the CIS equation — it handles inbound CIS deductions (what main contractors deduct from you) and outbound CIS deductions (what you deduct from your own subbies) in a single workflow, with monthly contractor returns generated automatically. £15-30/month including CIS module. QuickBooks Sole Trader is cheaper (£10/month) but its CIS handling is limited to single-side relationships, which suits builders who only sub TO main contractors but not those running their own subbies. ServiceM8 + Tradify integrate with both for quoting, scheduling, and on-site materials tracking; if you're running 3+ jobs concurrently, the job-management layer is worth more than the bookkeeping software. Avoid spreadsheets entirely from April 2026 — even bridging software won't make Excel-only workflows compliant with the individual-transaction rule.
3 questions. We email you a personal readiness report with what software to use, when you need it live, and what the flat-rate cost looks like for uk self-employed builders.
Two separate flows in your software. (1) Income from main contractor: gross invoice goes in as plumbing/building services income; the 20% CIS deduction is recorded as tax-withheld-at-source (a balance-sheet item, not a quarterly expense). It accumulates and offsets your final tax bill at the Final Declaration. (2) Payments to your plasterer: if he's CIS-registered, you deduct 20% from his invoice, pay him 80%, and pay HMRC the 20% monthly via your CIS contractor return. If he's not CIS-registered (unverified), you deduct 30%. The plasterer's gross cost is a quarterly expense (subcontractor costs); the CIS you withhold and remit is NOT an expense — it's tax you're collecting on HMRC's behalf. Most sole-trader builders running their own subbies need a contractor-side CIS workflow that's separate from MTD ITSA; Xero handles both in one place.
Depends on your basis. Under cash basis (most common for sole-trader builders under £150K turnover): the £15K is Q4 income of the OLD tax year, recorded the date the deposit cleared your bank. Under accruals basis: revenue is recognised when EARNED, so a deposit for work not yet done is technically deferred income — it sits as a liability until the work happens, then gets recognised in Q1-Q2 of the new tax year as the kitchen install completes. Cash basis is simpler and matches what most builders already do; accruals is more accurate for stage-payment jobs but means you're effectively running a deferred-revenue ledger, which most sole traders aren't equipped for. We usually leave smaller builders on cash basis and only move to accruals if the deposit-vs-delivery timing distortion gets material.
Each item — that's the individual-transaction rule from April 2026. The monthly Travis Perkins statement IS an aggregation, but HMRC wants the underlying line-item detail digitally captured. Most builders solve this by getting Travis Perkins to email itemised PDF invoices for every delivery (they will, on request) and forwarding each to a receipt-capture tool (QuickBooks, Xero, Dext) that OCRs them automatically. The monthly statement then just becomes a reconciliation check, not a source document. Same approach for Jewson, Selco, MKM, Howdens trade accounts. Capturing the line detail also matters because some items are zero-rated VAT (timber for new dwellings under certain conditions), some are standard-rated, and you want that distinction preserved if you're VAT-registered or close to the threshold.
Yes. The Plus tier includes all four quarterly submissions, the Final Declaration (with year-end adjustments rolled into it), monthly bookkeeping (up to 200 transactions/month), one VAT return per quarter if applicable, and 1-business-day email support. Covers up to two income sources — ample for most uk self-employed builders.
Xero with the CIS add-on is the strongest fit for builders running both sides of the CIS equation — it handles inbound CIS deductions (what main contractors deduct from you) and outbound CIS deductions (what you deduct from your own subbies) in a single workflow is excellent software but it doesn't categorise transactions for you, doesn't catch errors, doesn't reconcile bank feeds intelligently, and doesn't tell you when you've crossed a tax threshold. We use the same software but with a CGMA-qualified human running the process. For uk self-employed builders specifically, the difference is whether MTD ITSA becomes a Monday-morning admin task you can't avoid or something handled in the background.