CIS tracking for subcontractors: stop losing money to HMRC
9 min read
CIS is not only about calculating deductions. It is about proving them. If you cannot track deductions per contractor, you can lose money at tax return time. That is why people search cis deduction tracking software subcontractor.
Why CIS tracking becomes a monthly headache
You may invoice multiple contractors, each with different job values and payment timing. Deduction statements arrive in different formats. Without a clear system, totals drift and evidence gets buried.
- Who deducted what this month?
- Which contractor still owes payment?
- Are CIS totals aligned with invoice data?
What happens if tracking is weak
If records are incomplete, you may fail to claim all CIS deductions back through Self Assessment. That is real cash left with HMRC when it should stay in your business.
Billdr's CIS tracking approach
Billdr records CIS deduction per invoice and summarises by contractor. You get monthly totals and year-to-date visibility without rebuilding spreadsheets.
Critical rule: CIS deduction is calculated on net amount, not gross. This matters even more when VAT applies.
CIS + VAT + reverse charge explained simply
In construction, VAT and reverse charge can change how VAT appears on the invoice, but CIS logic still follows net value. If reverse charge applies, VAT handling differs, yet CIS deduction basis remains net labour/service amounts as relevant to your invoice setup.
For full VAT context, read VAT for sole trader tradespeople.
Accountant-ready reporting
Billdr includes CIS summaries in the accountant pack, alongside income, expense, mileage, and VAT sections. That means fewer back-and-forth questions in January.
See how full reporting is delivered in our accountant pack guide.
Try Billdr free for 30 days — no card required. Use code 3MONTHSFREE for 3 months free when you continue. Start at billdr.co.uk/signup.