CIS Tax Returns · West London
CIS tax returns in Isleworth
The Construction Industry Scheme takes 20% off a subcontractor's invoices before they are paid, and in Isleworth that money is often more than the tax actually owed. We prepare the return, reclaim the difference and chase HMRC for the refund. Contractors get the monthly CIS300 filed by the 19th with statements issued. Fixed fees, agreed in writing.
from £30/mo · fixed, per month
Next deadlines
- VAT return and payment for the quarter that ended last month
- CIS monthly return and deduction statements to subcontractors
- PAYE and National Insurance for last month paid to HMRC (electronic)
- VAT return and payment for the quarter that ended last month
Who this is for
CIS Tax Returns for Isleworth
Construction businesses in Isleworth on either side of the scheme: sole trader and limited company subcontractors with 20% or 30% deductions to reclaim, contractors who pay subcontractors and must file monthly, businesses that do both, and established subcontractors with turnover high enough to apply for gross payment status and stop deductions altogether.
What is included
Everything inside the fixed fee
- Subcontractor verification with HMRC and the correct deduction rate (20%, 30% or gross) applied each time
- Monthly CIS300 return filed by the 19th with deduction statements issued to every subcontractor
- Subcontractor annual Self Assessment with CIS deductions reclaimed and the refund chased with HMRC
- Gross payment status application prepared with the turnover, compliance and business tests evidenced
- Domestic reverse charge VAT checked on every CIS invoice in both directions
- CIS deductions offset against PAYE for limited company subcontractors through the EPS each month
How it works
CIS Tax Returns from Isleworth, step by step
Scope the job
We find out what you need filed, when it is due and what state the records are in, and tell you which fixed-fee package applies.
Agree the price
The fee is confirmed in writing. There is no hourly billing and nothing added for questions during the work.
Hand over the records
Photographs, PDFs, software access or a spreadsheet, sent however suits you. We confirm what we have and what is missing within two working days.
Approve, then we submit
You review the draft with our explanation, sign off, and we file. Receipts, copies and the next deadlines come back to you immediately.
Why IGI
Why Isleworth businesses file with IGI
One fixed fee for cis tax returns in Isleworth, agreed in writing before any work starts and never changed part-way through the job, however long it takes us.
We work to the HMRC and Companies House calendar, not an appointment diary. Clients in Isleworth get reminders at 60, 30 and 7 days before each date that applies to cis tax returns.
We serve Isleworth remotely by design: records by WhatsApp or email, drafts back for approval, filing electronic. The saving on premises is passed to you in the fee for cis tax returns.
Continuity matters in cis tax returns: the person who prepared last year's work for your Isleworth business prepares this year's, and remembers what was agreed.
The output for Isleworth clients is never just a form. It is the form, a one-page summary of what it says, and a note of the decisions it points to for cis tax returns.
Nothing is filed for Isleworth until you have reviewed and approved it. You see the draft, you ask questions, you sign off, then we submit and send you the receipt.
Local facts
About Isleworth
Isleworth is in West London, within Hounslow, in the TW7 postcode district, England. For businesses in England the tax rules are those set by the UK Parliament: the 20/40/45% income tax bands, Class 4 National Insurance for the self-employed at 6% and 2%, Corporation Tax at 19% to 25%, and Stamp Duty Land Tax on property. Business rates are set locally by the council.
| Place | Distance | Direction |
|---|---|---|
| Woodlands, Hounslow | 0.7 mi | W |
| Syon | 0.8 mi | NE |
| St Margarets, Richmond upon Thames | 0.8 mi | S |
| St. Margarets and North Twickenham | 0.9 mi | S |
| Richmond Riverside | 1 mi | SE |
| Spring Grove, Hounslow | 1 mi | NW |
| Hounslow South | 1 mi | W |
| Kew Gardens | 1 mi | E |
Worth knowing
Rules that come up in this work
The 60-day property CGT return
Selling UK residential property that was not your main home for the whole period of ownership triggers a separate Capital Gains Tax return, due within 60 days of completion along with payment of the tax. This is in addition to the annual Self Assessment. The gain is taxed at 18% or 24% depending on your income band, after the £3,000 annual exempt amount.
Crypto records and reporting
HMRC treats cryptoassets as property. Swapping one token for another, spending crypto or gifting it are all disposals for Capital Gains Tax, and staking and lending rewards are income. Gains are computed under pooling rules with same-day and 30-day matching. From 2026 HMRC receives data from exchanges worldwide under the Cryptoasset Reporting Framework, so unreported activity is increasingly visible.
Allowable expenses
Expense claims are where a return is won or lost in an enquiry. The test is wholly and exclusively for the trade; where a cost is mixed, the business proportion can be claimed if it can be identified. Capital items such as equipment and vans are relieved through capital allowances rather than as expenses, except under the cash basis where they are simply deducted when paid.
Record keeping
Good records are the difference between a quick enquiry and a long one. For the self-employed, five years after the filing deadline; for companies, six years from the year end; for VAT, six years. Photographs of receipts, PDF statements and software exports all count. The requirement is to keep records, not paper, and a well-organised cloud folder satisfies it.
Workplace pensions and auto-enrolment
Auto-enrolment duties begin the day you take on your first employee, not when the Pensions Regulator writes to you. Eligible staff must be enrolled, contributions paid every pay period and re-enrolment carried out every three years. Director-only companies without employment contracts are usually exempt. Fines for non-compliance are fixed and escalating.
Employer National Insurance
Since April 2025 employer National Insurance has been 15% on earnings above a £5,000 secondary threshold, a substantial increase for small employers. The Employment Allowance rose to £10,500 at the same time to soften it for the smallest businesses. Directors deciding their own salary weigh this cost against the Corporation Tax deduction a salary provides.
The trading and property allowances
Not every small income needs a tax return. The trading allowance exempts the first £1,000 of self-employment or casual income and the property allowance does the same for rental income, each measured on gross receipts. They cannot be combined with rent-a-room relief on the same income, and claiming the allowance means giving up the expense deduction for that source.
Questions
CIS Tax Returns questions from Isleworth
I have not filed for several years. Can you catch me up?
Yes. Late Self Assessment returns can be filed for the last four tax years to reclaim CIS deductions, and HMRC will offset refunds against any penalties. We quote a fixed fee for the set based on the number of years and reconcile each year's statements. The sooner this is done the more years remain claimable.
Can my CIS deductions be set against my VAT or other taxes?
For sole traders, no; CIS deductions are credited against your income tax and Class 4 National Insurance through Self Assessment, with the excess refunded. For companies, deductions are offset against PAYE and CIS owed, and the remaining balance is repaid by HMRC after the year end or, on request, set against Corporation Tax.
Do I need to register for CIS?
Subcontractors should register so deductions are 20% rather than 30%; registration is free with HMRC or £49 through our service with your UTR sorted at the same time. Contractors must register before paying their first subcontractor. If you are both, both registrations are needed; our dual package is £99.
How does the VAT reverse charge affect CIS work?
Since March 2021, where both parties are VAT and CIS registered and the supply is within the scheme, the subcontractor does not charge VAT; the contractor accounts for it on their own return. The invoice must state that the reverse charge applies. We check your sales and purchase invoices for this on every return.
How does CIS work for a limited company subcontractor?
Deductions suffered by a company are not reclaimed through Self Assessment. They are offset against the company's own PAYE and CIS liabilities each month through the Employer Payment Summary, and any excess at the year end is reclaimed from HMRC in writing. The £49 CIS plus payroll bundle handles this monthly.
What is gross payment status and can I get it?
Gross status means contractors pay you in full with no deduction; you pay your tax through Self Assessment or Corporation Tax instead. You need a construction turnover of at least £30,000 (sole trader) or £30,000 per director for companies, a clean compliance record for the previous 12 months and a UK bank account. Our £199 service prepares and submits the application.
How do I get started from Isleworth?
Message us on WhatsApp or email with a sentence about your business and what you need. We reply in working hours with any questions and a fixed fee for cis tax returns. Once you confirm, we tell you exactly which records to send and the work begins. Most Isleworth clients are set up within a day.
Which deadlines matter most for cis tax returns?
The next four dates that apply to cis tax returns are shown at the top of this page, calculated from today. For Isleworth clients we diarise every one of them from the day you join and send reminders before each, so the work is done in good time rather than in the last week before a penalty.
Fixed fees, filed on time, for Isleworth
Tell us what you need. You get one fixed fee in writing, and nothing is filed until you approve it.