CIS | Edgware
Half CIS, Half Private Jobs? How Edgware Trades Should Handle Mixed Income on One Tax Return
The typical Edgware trade does not have one income. There is the CIS package on a site (tax deducted at source), and there are the homeowner jobs across HA8, the extensions, re-roofs and repairs paid by bank transfer with no tax taken off. Both belong on one Self-Assessment, and handled badly, the mix quietly costs people thousands.
The two streams behave differently
CIS income arrives with 20 per cent already deducted; those deductions are a credit against your final bill. Private income arrives gross; its tax is settled through the return. On the return they are combined into one self-employment, with one profit figure and one expense pool spread fairly across both.
The classic DIY mistake
We regularly review self-prepared returns from Edgware where the private income was added on top, but the expenses were only set against the CIS work, or worse, the CIS deductions were forgotten entirely. The result is effectively paying tax twice on the same profit. Done correctly, the CIS deductions usually cover the tax due on the private work and still leave a refund.
The roofer who stopped overpaying
An Edgware roofer with a site package plus domestic re-roofs had filed his own returns for years, declaring everything honestly but claiming almost nothing. Rebuilding one year properly (scaffold tower, materials fronted on domestic jobs, miles between roofs and merchants, insurance, phone) plus amending the prior year recovered £3,700.
With the Broadwalk regeneration coming
Edgware town centre's redevelopment will pull in years of local site work. Trades picking up packages there while keeping their domestic round will live exactly in this mixed pattern, so getting the structure right now pays every year after. Practical basics: one business bank account for everything, invoices for private jobs, statements kept from every contractor, and receipts photographed as you go. More on the local service: CIS accountant in Edgware. Estimate the CIS side with the refund calculator.
Frequently Asked Questions
Do I need two separate tax returns for CIS and private work?
No. One Self-Assessment covers both as one self-employment. The skill is in presenting the two income streams and the shared expenses correctly.
Should I charge VAT on my private jobs?
Only if you are VAT-registered, which becomes compulsory when taxable turnover passes the threshold. Many mixed trades sit below it; we monitor clients who are getting close because crossing it unknowingly is expensive.
A homeowner paid me in cash. Does it really need declaring?
Yes. All trading income counts. With your expenses and CIS credits, declared cash usually costs far less tax than people fear, and undeclared cash is what triggers investigations.
Can I claim for tools I use on both site and domestic work?
Yes, business use is business use across both streams. No need to split tool costs between them.
My materials for private jobs go on my own card. Claimable?
Fully, as long as they are for the job and you keep the receipt or bank record. Materials fronted for domestic work are one of the most-missed claims we see.
What if a private customer never pays me?
A genuinely written-off bad debt is deductible for accruals-basis accounts, and on the cash basis you simply never count income you never received. Either way you should not pay tax on money you never got.
Does mixed income make payments on account worse?
It can: private income has no tax deducted, so a bigger balance can push you over the threshold where HMRC wants advance payments. We forecast this so January never surprises you.
Can you fix previous years where the mix was handled wrongly?
Usually yes. Returns can be amended within 12 months of the filing deadline, and overpayment relief can reach back further in the right circumstances.
Mixing site work and private jobs in Edgware?
One call sorts the structure: what to keep, what to claim, and whether your old returns left money behind.
Or email info@yourtaxhelp.co.uk | CIS accountant in Edgware
General guidance only. Not personal tax advice. Contact us for advice specific to your situation. Figures relate to the 2025/26 tax year unless otherwise stated.