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Specialist Accounting for CIS Contractors & Construction Businesses

Contractors can save significant money by registering as Limited Companies. We help CIS contractors structure their business tax-efficiently, manage CIS deductions, verify subcontractors and stay fully compliant with HMRC’s Construction Industry Scheme — every month, without fail.

Solicitors Specialism at a Glance

20+

years advising CIS contractors

£0

cost for your initial consultation

50%

average tax savings for our clients

CIS

returns filed on time, every month
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  • CIS Specialism: Contractors can save money by registering as Limited Companies. We help CIS contractors structure their business correctly from day one — and recover CIS deductions efficiently so cashflow is never unnecessarily tied up with HMRC.

CIS Contractor Finance Needs Genuine Sector Expertise

Solicitors’ practices operate under the Solicitors Accounts Rules — a complex regulatory framework governing the handling of client money that creates specific accounting and compliance obligations found nowhere else in the business world. Non-compliance can result in SRA intervention, sanctions and reputational damage that takes years to repair.

“Contractors can save money by registering as Limited Companies and saving money on tax. We identify the right structure for every CIS contractor’s situation — and the savings are often substantial from the very first year.”
We’ve been working with CIS contractors across London and the UK for over 20 years. We understand that the construction industry has its own financial rhythms — project-based income, plant and equipment investment, subcontractor relationships and seasonal cashflow — and that specialist advice genuinely makes a measurable difference.

Six Areas Where CIS Contractors
Need Specialist Accounting

The Construction Industry Scheme creates specific monthly compliance obligations — verification requirements, deduction calculations and monthly returns — that demand genuine specialist handling to avoid costly HMRC penalties.
CIS returns filed monthly
Every monthly CIS return submitted accurately and on time
CIS deductions reclaimed
We recover your CIS deductions efficiently through the tax system
Limited company savings
Registering as a limited company can save contractors thousands
CIS Monthly Returns
We file your monthly CIS return with HMRC — covering all subcontractors paid during the month, the deductions made and the payment statements issued. Filed accurately and on time, every single month, without exception.
Subcontractor Verification
Before paying any new subcontractor for the first time, HMRC requires verification to determine the correct deduction rate. We handle all verification requests — ensuring the right rate is applied and your compliance records are maintained correctly.
CIS Deduction Reclaims
As a subcontractor, CIS deductions made from your payments are offset against your PAYE/NI liabilities or reclaimed through self-assessment or corporation tax. We manage this process efficiently — recovering your money as quickly as possible.
Tax-Efficient Business Structure
Contractors can save significant money by incorporating as a limited company. We assess your situation and advise the optimal structure — potentially transforming your tax position and putting thousands more in your pocket every year from day one.
Gross Payment Status

Gross payment status allows subcontractors to receive payments without CIS deductions — dramatically improving cashflow. We advise on eligibility, help you apply to HMRC and maintain the compliance record required to keep it year after year.

Plant & Equipment Capital Allowances
Construction plant, machinery, vehicles and equipment attract significant capital allowances. We ensure every qualifying capital expenditure is correctly claimed — maximising your tax relief on every piece of plant, equipment and vehicle in your business.

A Full Specialist Service
Tailored to CIS Contractors

We provide everything a CIS contractor or construction business needs from its accountants — from monthly CIS returns and subcontractor verification through to annual accounts, corporation tax, VAT and plant capital allowances.
Monthly CIS Returns

We file your monthly CIS return with HMRC for every subcontractor paid during the month — accurately, on time, every month. No penalties, no missed deadlines, no errors in deduction rates applied to any subcontractor.

Subcontractor Verification

We verify all new subcontractors with HMRC before their first payment — confirming the correct deduction rate and maintaining the verification records your CIS compliance requires throughout the year.

CIS Deduction Reclaim Management

We offset your CIS deductions against your PAYE/NI liabilities or reclaim them through self-assessment or corporation tax — recovering your money efficiently and minimising the cashflow impact on your business.

Limited Company Formation

For sole trader contractors, incorporating as a limited company typically delivers significant annual tax savings. We handle the entire formation process and restructure your tax affairs for maximum efficiency from day one.

Project Accounting & Reporting

We provide job costing, project profitability analysis and contract accounting — giving you the financial visibility to price jobs correctly, manage costs effectively and understand the true profitability of every project.

VAT & Domestic Reverse Charge

The domestic reverse charge VAT rules for construction services add significant complexity. We ensure your VAT is handled correctly under these rules — avoiding costly errors in both billing and quarterly returns.

How We Support Your Construction Business

From your first conversation through to ongoing monthly CIS returns and year-round support — here’s exactly what working with MazeKey’s CIS specialists looks like.
Free CIS Consultation
We discuss your CIS position, business structure, current accounting and any immediate compliance issues — identifying actions and savings from the very first conversation.
File
CIS & Tax Review
We review your current CIS registration, return history, deduction position and business structure — identifying any gaps, missed reclaims or opportunities to improve your tax efficiency immediately.
Returns & Accounts Prepared
Monthly CIS returns, annual accounts, corporation tax or self-assessment returns — all prepared with full CIS sector knowledge and filed accurately to HMRC every time.
Filed & Submitted
Every CIS return filed on time, every deduction reclaimed efficiently — your compliance record with HMRC maintained flawlessly and your cashflow protected throughout the year.
Ongoing CIS Support
Monthly CIS returns, quarterly VAT, payroll, annual accounts and year-round tax planning — complete CIS contractor accounting support available whenever your business needs it.

Why CIS Contractors Need Specialist Accounting

CIS returns filed late or incorrectly
71%
Wrong deduction rate applied to subs
63%
CIS deductions not reclaimed
55%
Wrong business structure overpaying tax
49%
Gross payment status lost or not applied for
38%

CIS Compliance Is More Complex Than Most Contractors Think

The Construction Industry Scheme creates specific monthly compliance obligations for contractors — verification requirements, deduction calculations, payment statements and monthly returns — that sit on top of normal business accounting. Getting any of these wrong attracts HMRC penalties and interest that accumulate rapidly if not addressed.
We’ve been working with CIS contractors across London and the UK for over 20 years. We understand that the construction industry has its own financial rhythms — project-based income, significant plant investment, complex subcontractor relationships and seasonal cashflow pressures — and that specialist advice makes a measurable difference to your bottom line every year.

Without Specialist Advice
vs With MazeKey

The difference between generic accounting and specialist CIS contractor advice is both financial and compliance-critical. Here’s what it looks like in practice for your business.

The Cost of Getting It Wrong

CIS contractors without specialist support risk monthly penalties, incorrect deductions, unclaimed refunds and avoidable tax overpayment — often accumulating for years undetected.
  • cross-circleCreated with Sketch Beta. Monthly CIS returns filed late — automatic HMRC penalties accumulate every month
  • cross-circleCreated with Sketch Beta. Wrong deduction rate applied — subcontractor disputes and HMRC corrections
  • cross-circleCreated with Sketch Beta. CIS deductions not reclaimed — cashflow tied up with HMRC unnecessarily
  • cross-circleCreated with Sketch Beta. Wrong business structure — significant tax overpayment every single year
  • cross-circleCreated with Sketch Beta. Plant capital allowances missed — substantial tax relief unclaimed on equipment
  • cross-circleCreated with Sketch Beta. Domestic reverse charge VAT errors — HMRC penalties and corrections required

Built for CIS Compliance & Savings

Our specialist CIS contractor clients get monthly returns filed on time, deductions reclaimed efficiently and tax-efficient structures that put more money in their pockets.
  • Monthly CIS returns always filed on time — zero HMRC penalties, ever
  • Correct deduction rates verified for every subcontractor — no disputes
  • CIS deductions reclaimed efficiently — cashflow maintained and protected
  • Optimal business structure — significant annual tax savings delivered
  • All capital allowances claimed — maximum relief on plant and equipment
  • Domestic reverse charge VAT handled correctly — fully HMRC compliant

Why Choose MazeKey for CIS Contractors?

01
25 Years of CIS Sector Experience

We’ve been advising CIS contractors and construction businesses across London and the UK for over two decades — understanding monthly return obligations, subcontractor verification, deduction management and construction sector tax planning inside out.

02
Monthly CIS Returns — Never Missed, Never Late

We file your monthly CIS return on time, every month — covering every subcontractor, every deduction, every payment statement. Our CIS contractor clients have never received a late filing penalty since working with us.

03
CIS Deductions Recovered Efficiently

We manage the complete process of recovering your CIS deductions — whether through offset against PAYE liabilities or reclaim through self-assessment or corporation tax — ensuring your money is recovered as efficiently as possible.

04
Limited Company Advice That Saves Thousands

We assess every contractor’s situation and quantify the exact savings available from incorporating — handling the entire formation process if appropriate and restructuring your tax affairs for immediate maximum efficiency.

05
Capital Allowances Maximised on Every Project

Construction plant, machinery, vehicles and site equipment attract significant capital allowances. We ensure every qualifying expenditure is claimed correctly — maximising your tax relief across every piece of equipment and every project.

06
Available When Your Projects Need Us

Available from 9am to 10pm, seven days a week — so whether it’s a mid-project CIS query, a subcontractor payment question or a business growth decision, expert CIS accounting advice is always just a call away.

Ready to Get Your CIS Accounting Working Properly?

Monthly CIS returns filed on time, deductions reclaimed efficiently, tax-efficient structures and specialist construction accounting — all from a firm with 25 years of CIS experience. Book your free consultation today.
Get in Touch Today
020 3981 9311

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