How Is WIP Treated on a Law Firm Sale? Why Work in Progress Is Taxed as Income

When a solicitor sells their law firm, the work in progress (WIP) and unpaid bills (debtors) are often the most misunderstood items in the deal. The common assumption is that everything sold with a practice is a capital asset taxed at capital gains tax rates. That is true of goodwill. It is not true of WIP and debtors. Getting this distinction wrong can leave a selling solicitor with an unexpected income tax bill or an exposed position if HMRC challenges how the sale price was carved up.

This guide explains how WIP is treated on a law firm sale, why it is taxed as income rather than capital, how it is valued under FRS 102, and why the sale agreement must split goodwill from WIP and debtors. It is written for solicitors planning a sale, a retirement or a succession.

What Is WIP in a Law Firm Context?

Work in progress in a solicitor's practice is the value of chargeable work that has been done on a client matter but not yet billed. Under FRS 102, which most law firms follow, revenue is recognised as the firm obtains the right to consideration for the work performed. In other words, as soon as your firm has carried out chargeable work for a client, that work has a value on the balance sheet even though no invoice has been raised.

For a conveyancing solicitor, WIP might be the work done on searches, drafting and corresponding with the other side before completion. For a litigation solicitor, it could be the time spent preparing a witness statement or a court application. In both cases the WIP represents income the firm will realise when the matter completes and the bill is delivered. Debtors are the next stage along: work that has been billed but not yet paid.

WIP and debtors are both assets of the firm, but they are income assets. They sit on a different side of the tax line from goodwill, which is the capital value of the firm's reputation, client relationships and future earning capacity. That single distinction drives the whole tax analysis below.

Why WIP and Debtors Are Taxed as Income, Not Capital

This is the point that catches most sellers out. When a practice is sold or simply ceases, the unbilled WIP and the outstanding debtors are brought into account as a trading or professional income receipt. They are charged to income tax at the seller's marginal rate, plus Class 4 national insurance, in the final period of the business. They are not a capital gain and they do not attract capital gains tax treatment, even though they are passing across in a sale.

The statutory basis is ITTOIA 2005 sections 182 to 185, which govern the valuation of work in progress (and trading stock) on the cessation of a profession or trade. On cessation, the WIP is valued and the realised value is taxed as income. Including WIP in the sale to a buyer does not change this: the buyer is paying for an income asset, and on the seller's side the amount attributable to WIP and debtors is an income receipt. Selling the WIP rather than billing it yourself does not convert it into a capital sum.

This matters because the rates are very different. Income tax runs up to 45%, and Class 4 national insurance adds a further charge on a self-employed partner's or sole practitioner's profits. By contrast, goodwill is a capital asset taxed under capital gains tax, at materially lower rates and potentially with Business Asset Disposal Relief (see below). So the slice of the price that is WIP and debtors will usually carry a higher effective tax charge than the slice that is goodwill.

Goodwill Is the Capital Asset

A partnership or LLP has no shares, so its sale is an asset and business sale: the buyer acquires goodwill, WIP, debtors and fixed assets, and the outgoing member's capital account is settled. Only an incorporated firm (a company or ABS) can carry out a share sale.

Within an asset sale, goodwill is normally the largest item and it is a capital asset. The seller's gain on goodwill is charged to capital gains tax, reported on the capital gains pages, not as trading income. For 2025/26 the standard CGT rates are 18% within the basic-rate band and 24% above it, applying to all chargeable assets including goodwill (these rates have applied since 30 October 2024). The annual exempt amount is £3,000.

If the seller qualifies for Business Asset Disposal Relief (BADR), the CGT rate on qualifying gains up to the £1 million lifetime limit is 14% for disposals to 5 April 2026, rising to 18% from 6 April 2026. BADR requires the qualifying conditions to be met throughout the two-year period to disposal. For solicitors completing late in 2025/26, the step up from 14% to 18% on 6 April 2026 is a live timing point on the goodwill element.

So on the same deal you can have two very different tax treatments side by side: goodwill taxed as a capital gain (potentially at 14%), and WIP and debtors taxed as income at up to 45% plus Class 4 national insurance. That contrast is exactly why the split has to be done carefully. For the goodwill side of the analysis, see our guide to the tax treatment of goodwill on a law firm sale.

Why the Sale Agreement Must Split Goodwill From WIP and Debtors

Because goodwill is capital and WIP and debtors are income, the sale agreement must clearly apportion the total consideration between them. This is the central planning point of the whole transaction.

If the agreement lumps everything into a single headline figure, three problems follow. First, the seller has no clean basis for reporting the income element separately from the capital element on the tax return. Second, HMRC can challenge the allocation, particularly if it looks as though value has been pushed artificially into goodwill (capital, lower rate) and away from WIP and debtors (income, higher rate) to reduce tax. Third, buyer and seller can end up in dispute after completion about which figure covered what.

The allocation should be commercially reasonable and defensible: supported by the firm's accounting records, a professional valuation of the WIP, and a sensible goodwill figure. The income slice (WIP and debtors) and the capital slice (goodwill) should each be identifiable. A practice valuation specialist can produce the supporting analysis, and your accountant can model the tax outcome of the proposed split before you sign.

How Is WIP Valued on a Law Firm Sale?

Valuing WIP is rarely a matter of taking the full unbilled value at face value. A buyer is funding the completion of the work and taking the risk that not all of it will be recovered, so the figure agreed is usually a discount to the gross unbilled value. The valuation method should be set out in the sale agreement and supported by a professional valuation.

Recognised Value Under FRS 102

The starting point is what the firm has already recognised. Under FRS 102 the firm recognises revenue as it obtains the right to consideration, so the WIP carried on the balance sheet already reflects the work performed on a reliable-measurement basis. That recognised value is the natural anchor for the negotiation and the figure that feeds the cessation computation under ITTOIA 2005 sections 182 to 185.

Discounted Value

Most agreements then apply a discount to reflect realisation risk. Some of the recorded work may settle for less than expected, some clients may dispute a bill, and the buyer carries the cost and effort of completing matters before any cash comes in. A firm with a high WIP balance made up of straightforward, near-complete matters will support a smaller discount than a firm whose WIP is older, more speculative or concentrated in complex matters. As an illustration, a firm with a sizeable WIP balance of well-advanced conveyancing files might be valued close to its recognised value, whereas a firm with an ageing WIP balance of part-finished litigation might attract a larger discount.

Why the Method Matters for Tax

Whatever the agreed figure, the amount attributable to WIP and debtors is taxed as income in the seller's hands. The discount affects how much income is realised, but it does not change the character of the receipt. A robust, evidenced valuation protects the allocation in the agreement and makes the income figure on the tax return straightforward to support if HMRC asks.

Pre-Sale Billing: Bringing WIP Forward, Not Avoiding the Charge

A common pre-sale step is to bill as much advanced work as possible before completion, converting WIP into debtors or cash. It is worth being clear about what this does and does not achieve from a tax point of view.

Billing pre-sale does not turn an income receipt into a capital one. Whether the work is billed before completion or sold as WIP to the buyer, the value of that work is taxed as income. What pre-sale billing changes is the timing and the certainty: billed and collected work crystallises in the period you control, gives you cash in hand, and removes an item from the negotiation. It can also tidy the balance sheet so that goodwill, rather than a large unbilled WIP figure, is the headline asset the buyer is paying for.

The discipline is to bill only matters that are sufficiently advanced that the client will accept the invoice. Billing prematurely risks disputes and write-offs that reduce the firm's profit in its final period. A sensible pre-sale approach usually combines:

• Billing matters that are at or near completion before the sale date, so they are realised as ordinary income in the period you choose.
• Agreeing a clear WIP valuation method with the buyer for whatever remains unbilled.
• Splitting the sale price in the agreement between goodwill (capital) and WIP and debtors (income), so each element is reported correctly.

WIP and the SRA Accounts Rules

Solicitors must also consider the SRA Accounts Rules 2019 when dealing with a sale, although WIP itself is not client money. WIP is the firm's own income asset, not money held for clients. The Accounts Rules become relevant where the firm holds client money, for example sums paid on account of costs or disbursements before a bill is delivered.

On a sale, the buyer and seller must agree how to handle any client account balances relating to ongoing matters. Client money cannot simply be transferred to the buyer: it is held for the client and can only move to the buyer where the client has given informed consent or the buyer is taking over conduct of the matter. The firm's COFA should be involved to ensure the transfer of client balances complies with the rules. A COFA compliance specialist can help structure the handover of client matters and balances.

Worked Illustration: Where the Tax Falls

Consider a sole practitioner conveyancing solicitor selling their practice. The firm has a number of ongoing matters at various stages, so it carries a meaningful WIP balance alongside its goodwill and a small amount of fixed assets. The buyer agrees to take on the WIP at a discount to its recognised value to reflect realisation risk, and a separate figure is agreed for goodwill.

In the sale agreement and on the tax return, the two elements are kept apart. The goodwill figure is a capital gain. If the seller qualifies for BADR and is within the lifetime limit, that gain is charged at 14% (to 5 April 2026), after the annual exempt amount. The WIP and debtors figure is income: it is brought into account under ITTOIA 2005 sections 182 to 185 and charged to income tax at the seller's marginal rate, plus Class 4 national insurance.

The practical lesson is not that one structure dodges tax and another does not. It is that the same pound is taxed very differently depending on whether it is goodwill or WIP. A seller who understands the split, prices it correctly in the agreement and reports each part properly avoids both an unexpected income tax charge and an HMRC challenge to the allocation. For the wider mechanics of how a practice is sold, see our comparison of asset sales and share sales for law firms and our guide to selling a solicitors' practice.

Common Mistakes Solicitors Make With WIP on a Sale

Several avoidable errors recur when solicitors deal with WIP on a sale.

Mistake 1: Assuming WIP is capital. The most expensive misconception is treating WIP and debtors as a capital receipt taxed at CGT rates because they are sold alongside goodwill. They are income, taxed under ITTOIA 2005 sections 182 to 185 at income tax rates plus Class 4 national insurance, whether sold to the buyer or billed by the seller.

Mistake 2: Failing to split the price. Bundling goodwill, WIP and debtors into a single number leaves the income and capital elements tangled, exposes the allocation to HMRC challenge and creates uncertainty on the return. Each element should be separately identified and supported.

Mistake 3: Assuming all WIP is recoverable. Not all recorded work will be billed or paid. Some matters settle for less than the time recorded and some bills are disputed. A prudent seller reviews the WIP and writes off what is unlikely to be recovered before fixing the valuation.

Mistake 4: Skipping a professional valuation. A defensible WIP valuation underpins both the price split and the income figure on the return. Without it, the seller is exposed if HMRC questions whether value was shifted out of WIP (income) into goodwill (capital) to save tax.

How a Solicitor Accountant Can Help

The treatment of WIP on a law firm sale sits at the join between income tax and capital gains tax, and it needs input from an accountant who understands the legal sector. The accountant can value the WIP for the cessation computation, model the income tax and Class 4 national insurance on the WIP and debtors alongside the CGT (and any BADR) on the goodwill, advise on a defensible split of the sale price, and make sure the final-period return reports each element correctly.

At Accounts for Lawyers, we work with solicitors across England and Wales to plan practice sales, value WIP and goodwill, and structure the sale agreement so that the income and capital elements are clearly separated and correctly taxed. If you are considering selling your firm, speak to a solicitor accountant who understands WIP valuation and the income-versus-capital split before you sign anything.

This article provides general guidance only. Every law firm sale is different, and the tax treatment of WIP and goodwill depends on the specific facts of the transaction. You should take professional advice tailored to your circumstances before entering into any sale agreement.