Retention Money in Construction: How Subcontractors Can Stop Leaving Cash Behind

Retention is one of those construction words that sounds normal until you realise what it actually means.

You do the work. You invoice the job. The contractor holds some of your money back. Then months later, you have to remember to ask for it.

For a self-employed subcontractor, that can be brutal on cash flow.

It might only be 3% or 5% on paper, but across several jobs it adds up quickly. Worse than that, retention money is often forgotten because the job has moved on, the site is finished, and everyone is busy with the next one.

That is how tradespeople end up leaving money behind.

What is retention money?

Retention money is a percentage of your payment held back by the contractor or client.

It is usually there to protect them if defects appear or unfinished work needs sorting. In bigger construction jobs, retention is common. For smaller subcontractors, it can feel like being paid late by design.

A typical setup might be:

5% retained from each payment
half released at practical completion
the other half released after the defects period

The exact terms depend on the contract. That is why you need to check the paperwork before you start.

Do not assume retention works the same on every job. It does not.

Why retention causes problems for tradespeople

The biggest issue is not always the deduction itself. It is the tracking.

Most subcontractors are focused on the work in front of them. You finish one site, move to another, then another. Three months later, you vaguely remember there is retention due somewhere but you cannot remember the amount, the date or who to chase.

That is when the money slips away.

Retention causes three main problems:

it reduces your cash flow while you are still paying fuel, materials and wages
it creates admin months after the job has finished
it gives the contractor an excuse to delay final payment if your records are weak

If you are not tracking retention properly, you are relying on the contractor to remind you to collect money they are holding. That is not a business system.

That is hope.

Agree the retention terms before starting

Before you start the job, you need to know:

what percentage will be retained
whether retention applies to labour only or the full invoice
when the first part is released
when the final part is released
what needs to happen before release
who you contact when it becomes due

If this is not clear, ask before you begin.

A simple message is enough:

Can you confirm the retention percentage, when each part is released, and whether it applies to labour only or the full invoice amount?

If the answer is vague, that is a warning sign.

Put retention on your invoice clearly

Do not hide retention in your own head.

Show it clearly on the invoice so there is a record.

For example:

Total labour and materials: £4,000
Retention at 5%: £200
Amount due now: £3,800
Retention due for release: £200

That way, both sides can see the money exists.

If the retention is split, record the split as well:

£100 due at completion
£100 due after defects period

This matters because six months later, you do not want to be digging through WhatsApp messages trying to reconstruct the job.

Keep a retention tracker

Every subcontractor who deals with retention needs a tracker.

It does not have to be fancy. It just needs to show:

customer or contractor name
job name
invoice number
invoice date
retention amount
expected release date
amount released
amount still owed
notes from any chase

The mistake is treating retention as part of the old job. It is not. It is money owed to the business and it needs the same attention as an unpaid invoice.

If you would chase a £500 invoice, you should chase £500 of retention.

Chase before it becomes ancient history

Do not wait a year and then send a vague message.

Set a reminder before the release date and chase professionally.

Try something like:

Hi, just checking in on the retention for invoice 1042 on the Oak Street job. The completion retention is now due for release. Can you confirm when payment will be processed?

Keep it calm. Keep it specific. Give the invoice number, job name and amount.

The more organised you sound, the harder you are to ignore.

Do not let snagging become an open-ended excuse

Retention is often linked to defects or snagging. That is fair enough if there is genuine work to finish.

But it should not become an open-ended excuse to hold money forever.

If there is a snag, ask for it in writing. Ask what needs correcting and by when. Once it is sorted, confirm completion in writing and request release of retention.

The key is to keep everything moving.

No vague conversations. No loose promises. No leaving it to someone else.

Why this is a Dayrates problem

Retention is not just a payment issue. It is a record-keeping issue.

If you do not have the invoice, job notes, customer details and payment history in one place, retention becomes easy to forget.

Dayrates helps tradespeople stay on top of the paperwork that usually slips through the cracks: invoices, quotes, receipts, CIS deductions and job records from the phone.

Retention is exactly the sort of money that gets lost when admin is scattered across notebooks, texts and memory.

Final word

Retention money is still your money.

Do not treat it like a bonus. Do not treat it like something you might get if the contractor remembers.

Track it from the start, show it clearly on the invoice, set a reminder, and chase it like any other payment.

The job is not finished when the tools leave site.

It is finished when all the money is in.