Monthly admin piles up.
Verifying subcontractors and calculating deductions every month is easy to fall behind on.
ICAEW Chartered
3 weeks turnaround
Flexible plans available
CIS Accountant — filed fast, fixed fee, ICAEW-regulated.
Monthly CIS returns prepared and submitted. We verify subcontractors, calculate deductions, and keep you compliant — you don't have to.
- An ICAEW-qualified accountant signs off every filing.
- Filed within 3 weeks of receiving your records
- Fixed fee — no hourly billing, no surprise invoices
- Fully online — share records securely, no office visits
Fixed quote by email within one working day · No obligation
ICAEW Chartered Accountants · Practice established in the 1970s · See our firm details
- Regulated by ICAEW
- Established in the 1970s
- 100% online
Reviewed by Krishna Prasad Dahal FCCA, ACA (ICAEW), FCA (ICAI India)
Sound familiar?
CIS shouldn't be this complicated.
Most contractors and subcontractors we speak to tell us the same story. If any of these sound familiar, you're in the right place.
Deadlines come round every month.
Miss a monthly CIS deadline and HMRC penalties start stacking immediately.
One verification error means penalties.
Get a subcontractor's status wrong and HMRC can charge penalties on top.
Simple by design
How We File Your CIS Returns
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01
Get your fixed quote
Tell us if you're a contractor or subcontractor. Reply within one working day.
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02
Share your records
Payment and subcontractor details, uploaded securely.
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03
Filed every month
Verified, calculated, submitted. You approve in plain English first.
Common questions
FAQs About Our CIS Accountant Service
Still not sure? Email a chartered accountant directly — we reply within one working day.
Do I need to register for CIS?
If you're a contractor paying subcontractors in construction, yes.
Are you ICAEW Chartered Accountants?
Yes. SmartFiling is the trading brand of Ballards Newman (Finchley) Limited, an ICAEW-regulated London Chartered Accountants practice with roots in the 1970s.
What if I missed a filing deadline?
We can still help — late filings attract automatic penalties, but we'll minimise additional costs and file quickly.
How do I claim back CIS deductions?
Limited company subcontractors reclaim through payroll/Corporation Tax. Sole traders reconcile through Self Assessment.
Can you verify my subcontractors for me?
Yes, subcontractor verification with HMRC is included.
Also available
Other fixed-fee services you might need.
Payroll Services
Payroll processing, PAYE submissions and RTI filings handled for you. Straightforward and compliant for small teams.
From £15 per employee / month
See Payroll ServicesSelf Assessment Tax Returns
Your Self Assessment tax return prepared, reviewed and filed with HMRC from £149 — for directors, landlords, sole traders and anyone with untaxed income.
From £149
See Self Assessment Tax ReturnsBookkeeping
Monthly or quarterly bookkeeping that keeps your records HMRC-ready year-round and makes accounts filing simpler every time.
Flexible plans available
See BookkeepingReady when you are
Get Your CIS Returns Filed — Properly.
Flexible plans available · 3 weeks turnaround · ICAEW Chartered Accountants.
UK Chartered Accountants · ICAEW-regulated
100% Online
Fixed fees from £149
PII insured
