CIS Returns for Contractors
Your CIS returns, handled monthly.
If you engage subcontractors under the Construction Industry Scheme, the monthly filing obligation sits with you — verification, deduction rates, and submissions to HMRC, every month without exception. Supreme Consulting manages all of it on fixed-fee pricing, with replies within one working day.
- Monthly CIS returns filed before the 19th, every month
- Subcontractor verification completed before any payments are made
- Correct deduction rates applied — 0%, 20%, or 30% — without guesswork
- CIS deductions tracked and reconciled against your year-end accounts
No long-term contract. If it is not working after three months, you leave with your CIS records up to date and nothing owed.
Get a free quote
Fixed-fee pricing. Reply within one working day.
What our clients say
★★★★★
Prompt, Clear Communication Every Time
“Communication is always prompt, professional, and easy to understand, which makes dealing with finances far less stressful.”
★★★★★
Good Results at a Reasonable Price
“Stuart is a thorough efficient worker who produces good quality results at a reasonable price.”
★★★★★
Holds Your Hand Throughout
“Stuart holds your hand and advises throughout!”
★★★★★
Takes the Time to Explain Things
“They take the time to explain things.”
Sound familiar?
CIS admin piling up alongside the day job?
The monthly CIS return deadline does not move. Neither does the obligation to verify each subcontractor before paying them, or to apply the right deduction rate for each one. For a contractor running jobs, managing a team, and trying to keep cash flowing, the paperwork has a way of slipping. A missed filing brings a penalty. An incorrect deduction brings a correction and a conversation with HMRC you could have done without.
- ✕ Monthly CIS return missed or filed late, triggering HMRC penalties
- ✕ Subcontractors paid before being verified, creating deduction rate risk
- ✕ CIS deductions unreconciled, causing confusion at year-end and on Self Assessment
What sorted looks like
Your monthly CIS return is filed before the 19th, every month, with the correct deductions applied and a clear record kept. Subcontractors are verified before payment. Your deduction records match your accounts at year-end.
- ✓ Monthly CIS returns filed on time — HMRC penalties taken off the table
- ✓ Every subcontractor verified before payment — correct rate applied from day one
- ✓ CIS deductions tracked through the year, reconciled cleanly at year-end
- ✓ Fixed-fee pricing — you know the cost upfront, with no hourly surprises
What clients say after working with us
Contractors and small business owners across Hampshire and beyond. Here is what a few of them said.
Very clear and gives excellent clarity on all situations when I am in doubt. Communication is always prompt, professional, and easy to understand, which makes dealing with finances far less stressful. They take the time to explain things.
Stuart is a thorough efficient worker who produces good quality results at a reasonable price.
What the CIS service covers
A monthly filing service built around the actual obligations a contractor faces under the Construction Industry Scheme — no bolt-ons, no vague promises.
Monthly CIS Return Filing
Your CIS return is prepared and submitted to HMRC before the 19th of each month. Deductions are calculated correctly for each subcontractor on your books, and a statement of deductions is issued so subcontractors can claim what they are owed.
Filed on time, every monthSubcontractor Verification
Before any subcontractor is paid for the first time, their status is verified with HMRC. This determines whether the correct rate is 0%, 20%, or 30% — and keeps you on the right side of your obligations from the outset.
Completed before first paymentYear-End Reconciliation and Self Assessment
CIS deductions made across the year are reconciled against your accounts at year-end, matching what was reported monthly with what appears in your annual figures. For subcontractors who are sole traders, those deductions feed directly into your Self Assessment return.
Clean records at year-endConsistent results across different businesses
Sole traders, contractors, and small business owners — a cross-section of who we work with and what they found.
Help That Goes Beyond Basic Advice
“I’m so grateful for the help received with my small cleaning business. Stuart holds your hand and advises throughout!”
Clarity in Every Situation, Without Jargon
“Very clear and gives excellent clarity on all situations when I am in doubt. Communication is always prompt, professional, and easy to understand, which makes dealing with finances far less stressful. They take the time to explain things.”
Thorough Work Delivered at a Fair Price
“Stuart is a thorough efficient worker who produces good quality results at a reasonable price.”
What makes the difference in practice
CIS compliance is straightforward when it is handled properly. Here is why contractors working with us find it stays that way.
Construction compliance, not an afterthought
Supreme Consulting has worked with construction contractors and subcontractors since 2005. CIS verification, monthly returns, and deduction rate management are part of the core service, not something figured out on the fly. You will not need to explain how the scheme works before getting a useful answer.
The 19th does not catch us out
The monthly filing deadline is fixed, and so is our process for meeting it. Returns are prepared and submitted ahead of the deadline each month without reminders needed from you. If something changes on your subcontractor list, the update is factored in before the submission goes out.
Fixed fee, no meter running
CIS returns are priced on a fixed monthly fee based on the number of subcontractors on your books and the scope of the service. You know the cost upfront. There are no hourly charges for verification calls or queries — those are part of the service.
Up and running in four steps
The transition to having your CIS handled externally takes very little from you. Most of the work happens on our side.
A short discovery call
We start with a no-obligation call to understand your current setup — how many subcontractors you pay, whether verification is up to date, and how your CIS records have been managed so far. Fifteen to twenty minutes is usually enough.
A clear, fixed-fee proposal
You receive a written proposal setting out exactly what is covered, what it costs per month, and when we start. No ambiguity about scope and no surprises on the first invoice.
We take on the records
We request access to your existing CIS records and, where needed, work through any outstanding verifications or back-filings. If returns are in arrears, we deal with that as part of the onboarding rather than leaving it to mount up.
Monthly filings, handled
From the first full month, your CIS return is prepared, submitted, and confirmed without you needing to track the deadline. You receive a copy of the submission and subcontractor statements. The 19th becomes a date you stop thinking about.
“I’m so grateful for the help received with my small cleaning business. Stuart holds your hand and advises throughout!”
Answers to the questions we hear most
Do you handle CIS for both contractors and subcontractors?
Yes. For contractors, we manage monthly CIS returns, subcontractor verification, and deduction statements. For subcontractors who have CIS tax deducted from their payments, we include those deductions in your Self Assessment return and ensure any overpaid tax is reclaimed. The two roles have different obligations under the scheme and we deal with both.
What does the CIS returns service cost?
Pricing is fixed monthly and based on the number of subcontractors on your books and the scope of what is included. You receive a written quote before anything starts. There are no hourly charges for verification queries or corrections — those are covered within the agreed fee. Indicative figures are available on a call.
My CIS returns are behind. Can you catch up on arrears?
This is a fairly common starting point. We work through outstanding returns as part of onboarding, establish what has and has not been filed, and submit any arrears in the correct order. HMRC imposes late filing penalties on a sliding scale, and getting the backlog cleared quickly limits further accrual. We will be straightforward with you about what is owed and how to resolve it.
Is there a minimum contract length?
No long-term commitment is required. We work on a rolling monthly arrangement and ask for one month’s notice if you wish to leave. If you move on, your CIS records are up to date, your submissions are on file, and nothing is owed. Most clients stay because the service works, not because they are contracted to.
What if a subcontractor’s verification status changes mid-year?
Verification status can change — for example, a subcontractor may move from gross payment status (0%) to standard rate (20%) following an HMRC review. We check status at the point of first engagement and monitor for changes that affect the deduction rate. If HMRC issues a new instruction, it is applied from the next payment without you needing to track it.
Can CIS deductions affect my corporation tax or Self Assessment bill?
Yes, and it is worth understanding how. For limited company contractors, CIS deductions suffered can be set against your PAYE and NIC liabilities, and any excess is refundable. For sole trader subcontractors, deductions are credited against your Self Assessment tax liability. Handled correctly, you do not overpay — but the offset mechanism does need to be claimed properly and at the right time.
Related services for construction businesses
Stop tracking the 19th yourself. We have that covered.
Monthly CIS returns filed on time, subcontractors verified, deductions tracked. Fixed-fee pricing, no lock-in, and a reply within one working day.