Retention Money Is Not Your Money Yet — Here's How to Account for It Properly

If you work in construction, whether you're a subcontractor, main contractor, or running a limited company, retention money is part of everyday business. But it's also one of the most misunderstood areas of accounting in the sector.

Many construction businesses record retention as income the moment they raise an invoice. That's a mistake that can distort your profits, inflate your tax bill, and give you a dangerously inaccurate picture of your cash position.

Let's break down what retention money is, how HMRC and UK accounting standards treat it, and how to record it correctly in your accounts.

What Is Retention Money?

Retention (sometimes called a retention withheld or contractual retention) is a percentage of each payment — typically 3% to 10% — that a client or main contractor holds back until the work is fully complete and any defects are resolved.

For example, if you invoice £50,000 for a phase of works and the contract has a 5% retention clause, the client pays you £47,500. The remaining £2,500 is held back, often until practical completion and the end of a defect's liability period.

The retention is technically still owed to you but it's conditional. You can't spend it, and in some cases, you might not receive it at all if defects arise.

The Accounting Problem: When Is Retention Actually Income?

This is where many construction businesses go wrong. Under UK GAAP (FRS 102) and IFRS 15 (for larger entities), revenue should only be recognised when it is probable that the economic benefits will flow to the business and the amount can be reliably measured.

For retention, this means you should not recognise the full invoice value as income at the point of billing if there is a significant risk that the retention will not be released.

There are two common approaches used in practice:

• Recognise the full invoice and show the retention as a debtor, with a note or provision for amounts at risk
• Recognise only the cash-receivable portion as immediate revenue, deferring retention until it is contractually due, and payment is probable

For most small and medium-sized construction businesses filing under FRS 102 or FRS 105, the most important thing is consistency and accuracy not inflating profit with money you haven't received and may not receive.

How to Record Retention in Your Accounts

Here's a practical example. You're a subcontractor and you issue an invoice for £40,000. The main contractor withholds 5% retention (£2,000).

Step 1 — At Invoice Stage

Record the full invoice value as a debtor and split the trade receivable:

If you are uncertain whether the retention will be collected, you may also wish to create a provision against the retention receivable. This reflects the risk in your balance sheet without understating turnover entirely.

Step 2 — When the Retention Is Released

Once the defects period ends and the client confirms release of retention:

At this point the retention becomes real cash and clears off your balance sheet.

Why This Matters for Tax

If you record retention as income when invoiced but haven't received it by your year-end, you could be paying Corporation Tax or Income Tax on money you don't yet have in the bank and may never receive.

Working closely with a tax advisor Bolton or Manchester businesses can trust means structuring your accounts to avoid overpaying tax on paper profits that haven't materialised into cash.

HMRC expects your accounts to reflect commercial reality. If you're using cash basis accounting (available to sole traders with turnover below £150,000), retention is typically only income when received which simplifies the treatment.

For limited companies, accruals basis applies, and the treatment above is the correct approach.

Common Mistakes Construction Businesses Make

• Recording the full invoice (including retention) as immediately due cash — distorting cash flow forecasts
• Forgetting to chase retention when defects periods expire — cash left on the table
• Not reconciling the retention debtor ledger — leading to unpleasant surprises at year-end
• Mixing retention with standard trade debtors — obscuring how much of your receivables are at risk
• Paying VAT on retention before it is released — always check your VAT scheme

A Note on VAT and Retention

Under standard VAT accounting, VAT becomes due when you issue the invoice — even on the retained portion. However, if you're on the Cash Accounting Scheme, VAT is only due when you receive payment, which means the retained amount does not create a VAT liability until the money lands.

For construction businesses with significant retention balances, this is a material consideration. If you're not on Cash Accounting and haven't reviewed this, it's worth speaking to a small business accountant in Bolton or Manchester about whether a scheme change is appropriate.

How YRF Accountants Can Help

At YRF Accountants, we work with construction companies, subcontractors, and sole traders across Bolton, Manchester, and Bury. We help you structure your accounts to reflect the reality of how construction cash flows, including correct treatment of CIS, retention, and project-based billing.

Whether you're dealing with a backlog of uncollected retention or trying to understand why your profit looks strong, but your bank balance doesn't, we can help you get clarity.

Frequently Asked Questions

Is retention money classed as income for tax purposes?

For limited companies on accruals basis, yes — retention is generally recognised as income when the right to it is established under the contract. However, provisions can be made for amounts at risk. Sole traders on cash basis only recognise it when received.

What happens if the retention is never released?

If retention is formally disputed or written off, it can be treated as a bad debt and deducted from income for tax purposes. Keep records of all correspondence and dispute resolution attempts.

Should retention appear on my balance sheet?

Yes. Retention owed to you should appear as a debtor (retention receivable) on your balance sheet, separate from your standard trade debtors. Retention you owe to others appears as a creditor.

How do I track retention across multiple projects?

Use your accounting software (Xero or QuickBooks) to set up a dedicated retention receivable account. Log each contract's retention separately so you can chase it systematically when defects periods expire.