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🏗️ CIS Specialist · Portsmouth

CIS Accountant in Portsmouth — Contractors & Subcontractors

HMRC-registered CIS specialists serving Portsmouth fully online. Monthly returns on time, refund claims maximised, self-assessment sorted — fixed fee.

📅 Book Free 15-Min Call📞 07478 645331
HMRC Registered AgentSame-Day FilingFixed Monthly FeesCIS Refunds Claimed
CIS Accountant in Portsmouth

CIS Made Simple for Portsmouth Contractors & Subcontractors

Portsmouth is one of the South Coast's major commercial cities, home to the UK's largest naval base, significant waterfront regeneration and a large domestic construction market serving the city's dense residential population. PO1 to PO4 has a substantial trades and construction community working on both public and private projects across Portsmouth and the wider Hampshire area. Your Tax Help Accountants, HMRC-registered, handles CIS for Portsmouth contractors and subcontractors fully online at a fixed monthly fee.

💡 As an HMRC-registered agent we deal with HMRC directly — filing CIS returns, verifying subcontractors, managing compliance and claiming back overpaid tax.

What We Handle

Complete CIS Service for Portsmouth

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Monthly CIS Returns

Filed by the 19th every month — all payments and deductions covered. Never miss a deadline.

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Deduction Statements

Accurate monthly statements for every subcontractor — gross, deduction and net shown clearly.

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Subcontractor Verification

Every new subcontractor verified with HMRC before first payment — correct rate from day one.

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CIS Refund Claims

Self-assessment filed with every allowable expense — recovering all overpaid CIS deductions.

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Self-Assessment Returns

Full SA100 annually — all income, deductions and expenses, maximising your refund.

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Gross Payment Status

Application to HMRC for gross payment status if you qualify — no deductions at all.

Are You Owed a CIS Refund?

Most Portsmouth CIS subcontractors overpay tax. Book a free call and we will calculate exactly what you are owed.

📅 Find Out What You're Owed — Free Call
Why Your Tax Help Accountants

CIS Specialists. Fixed Fee. Always Responsive.

  • HMRC-registered agent — we deal with HMRC directly on your behalf
  • Same-day filing for urgent or overdue CIS returns
  • Fixed monthly fees — no surprises, no hourly rates
  • All deduction rates and rules handled correctly
  • Self-assessment with every allowable expense claimed
  • Serving Portsmouth (PO1-PO4) and the whole of the UK online
4.5★
Google Rating
Same Day
Urgent filing available
Fixed Fee
No surprise bills — ever
CIS Questions

Frequently Asked CIS Questions

I'm a Portsmouth tradesperson — what is the deadline for my monthly CIS return?
Monthly CIS returns must be filed with HMRC by the 19th of the month following the tax month in which payments were made. For example, payments made in March must be reported in a return filed by 19 April. HMRC issues an automatic £100 penalty for each return filed late — even by one day, even if the return is nil. We file your return every month before the deadline as part of your fixed service.
Can you handle CIS for Portsmouth defence and naval construction contractors?
Yes. CIS applies to construction work on defence and naval facilities in the same way as any other construction project. We handle your monthly returns, subcontractor management and self-assessment across all your Portsmouth and Hampshire contracts — including any government or MoD projects — as a single unified service.
What should a Portsmouth sole trader do before taking on their first CIS subcontractor?
Before making any payment you must register as a CIS contractor with HMRC and verify the subcontractor through HMRC's online service to establish the correct deduction rate. You then deduct CIS from each payment, provide monthly deduction statements and file a monthly return by the 19th. We set up everything you need and manage all ongoing compliance — so you can focus on your work.
Can you file overdue CIS returns for a Portsmouth business that has fallen behind?
Yes — and do it urgently. Penalties accumulate at £100 per month per missed return. We assess your full position, prepare and file all outstanding returns on the same day if needed, manage any penalty situation and get your compliance back on track permanently.
How do I get started?
Book a free 15-minute call via Calendly or call 07478 645331. We review your CIS position, explain what needs doing and give you a clear fixed-fee quote. We can take over immediately.
Related Guides

Further Reading

🏗️How to Claim a CIS Tax Refund — Step-by-Step Guide for 2026 → 📋How to Register for Self Assessment with HMRC in 2026 → 💼Do I Need an Accountant as a Sole Trader? The Honest Answer for 2026 →

Get Your CIS Sorted Today

No obligation. No jargon. A straightforward conversation about your Portsmouth CIS situation.

📅 Book Free 15-Min Call📞 07478 645331

Email: info@yourtaxhelp.co.uk  |  yourtaxhelp.co.uk