If you are a plumber working under the Construction Industry Scheme (CIS), you know the frustration of seeing a large part of your pay taken before it even hits your account. Typically, 20 percent of your invoice is deducted and paid straight to HMRC.
It feels like lost earnings – but the truth is, you often do not owe anywhere near that much tax. In fact, many plumbers overpay tax under CIS and are due a refund. The problem is that without proper records, those refunds are never claimed. That is why many choose to work with CIS bookkeeping services for tradespeople, making sure their accounts are accurate all year round.
Why plumbers lose money under CIS ?
There are a few reasons plumbers end up giving HMRC more than they should. CIS deductions apply at a flat rate of 20 percent, even when your profit margins are tight. Everyday expenses, from van insurance and fuel to tools, materials, and phone bills often go unrecorded. Missing receipts and late invoicing make it harder to reclaim what you are owed, while last-minute bookkeeping at year-end usually means mistakes and missed claims.
A plumber’s real experience
Take Joe, a self-employed plumber. Over the course of one year, £18,000 was deducted through CIS. Once his expenses were recorded properly, his actual tax liability was £14,800. That difference meant a refund of £3,200, money that would have otherwise been lost. With monthly bookkeeping support for plumbers, cases like Joe’s are easy to prevent.
How to stop losing money ?
The best way to keep more of your earnings is by keeping on top of your records. That means tracking every expense, filing CIS submissions correctly and on time, and reviewing monthly bookkeeping reports so you always know where you stand. Working with a dedicated CIS bookkeeper who understands the plumbing trade ensures nothing slips through the cracks.
The Tax2u approach
At Tax2u, we specialise in affordable, construction-focused bookkeeping. Our service is built for plumbers and sole traders who want to maximise earnings while staying compliant. We reclaim overpaid deductions, include every allowable expense, and provide clear monthly reports that give you a true picture of your business.
Learn more about our Bookkeeping services for tradespeople and stop losing money to HMRC.