If you are planning to sell your dental practice, one date on the calendar now carries a price tag. Business Asset Disposal Relief (BADR), the reduced rate of capital gains tax on a qualifying business sale, rises from 14% to 18% on 6 April 2026. On a gain within the £1m lifetime limit, that four-point step is worth about £40,000 of extra capital gains tax. For a profession where a single practice sale is often the largest financial event of a career, £40,000 is not a rounding error.

But the deadline is also widely misunderstood, and rushing the wrong way around it can cost far more than the rate ever will. The date that matters is the date of disposal, which is a precise legal concept, and for many dental sale agreements it is the date you exchange contracts, not the date you complete. This article sets out what BADR now is, which date actually governs your rate, who qualifies, and the worked numbers that show when chasing the old rate is smart and when it is a false economy.

The deadline in one line

BADR rises from 14% to 18% on 6 April 2026. A £1,000,000 qualifying gain therefore costs £140,000 of CGT if it disposes on or before 5 April 2026 and £180,000 if it disposes on or after 6 April 2026. The difference is £40,000 for one day of disposal timing.

The trap in that sentence is the word "disposes". A great many sellers assume it means the day the deal completes and the keys change hands. It does not always mean that, and getting it wrong is how people miss a window they thought they had hit. We come back to the precise rule below, because it is the single most important technical point on this page.

What BADR is, and the rate it now carries

Business Asset Disposal Relief is a reduced rate of capital gains tax on qualifying disposals of all or part of a trading business. It sits in TCGA 1992 ss.169H to 169S. There are two numbers that define it:

  • The rate, read with its date band. BADR was 10% to 5 April 2025, is 14% for disposals from 6 April 2025 to 5 April 2026, and is 18% for disposals from 6 April 2026. If you read an older article that says BADR is 10%, it is out of date.
  • The lifetime limit. The relief applies to qualifying gains up to a £1m lifetime limit per individual. That limit has been £1m since 11 March 2020 (reduced from £10m) and is not indexed. It is cumulative, so earlier BADR or Entrepreneurs' Relief claims eat into it.

So a seller with a £1m gain and no prior BADR pays 14% if they dispose before 6 April 2026 and 18% from that date. A seller who has already used part of their £1m has a smaller band of gain reaching the relief, and the rate rise only bites on whatever band remains.

Why the disposal date, not the handshake, governs

Capital gains tax fixes the disposal date by reference to the contract, not completion, under TCGA 1992 s.28. The rule splits two ways:

  • Unconditional contract: the disposal date is the date the contract is made, which is the date of exchange (s.28(1)). Completion can follow weeks or months later and does not change the disposal date.
  • Conditional contract: the disposal date is the date the last condition is satisfied (s.28(2)). If the contract is conditional on, for example, a third party giving consent, the disposal does not happen until that consent is given.

Many dental sale agreements are unconditional at exchange. Where that is the case, exchange is the disposal date, so an unconditional exchange on or before 5 April 2026 locks in the 14% rate even if completion, and the money, land after that date. That is a genuine and legitimate planning lever for a late-2025/26 sale.

The flip side matters just as much. If your contract is conditional, perhaps on commissioner consent to novate the NHS contract, then a condition satisfied on or after 6 April 2026 pushes you into the 18% band, even if you signed in March. "Completion" is a loose word in this context. The disciplined question is: is my contract conditional or unconditional, and if it is conditional, when is the last condition met? That is a question for your solicitor, and it can be designed deliberately. Parties sometimes use a conditional structure precisely so that the disposal falls in a later tax year, or an unconditional one to pull it into an earlier one.

The two-year qualifying clock

BADR is not just about the disposal date. The qualifying conditions must be met throughout the two-year period ending on the date of disposal. For a sole trader or partnership, that means the business has been trading throughout. For a share sale of an incorporated practice, throughout those two years you must have held:

  • at least 5% of the ordinary share capital;
  • at least 5% of the voting rights;
  • at least 5% of the economic entitlement (broadly, rights to profits and assets); and
  • officer or employee status in the company,

with the company a trading company throughout. The clock ties directly to the deadline. If you incorporated recently to enable a share sale, the two years runs from incorporation, not from when you first opened the practice. A seller who incorporated in, say, mid-2025 simply cannot make a qualifying share sale before mid-2027, whatever the BADR calendar says. The deadline is irrelevant if you do not yet qualify.

What actually qualifies on a dental sale

The common shapes of a qualifying dental disposal are:

  • a sole trader or partnership going-concern disposal, selling the goodwill and trade (and you can retain the freehold if you wish);
  • a company share sale, where the individual sells their shares in the practice company and, conditions met, claims BADR on the share gain.

One structure does not give the individual BADR: an asset sale by a company. There, the company sells the goodwill and assets, the company pays corporation tax on its own gain, and the post-tax proceeds then have to be extracted to the individual, taxed again on the way out. BADR is a personal relief on a personal disposal, so a company-level asset sale does not access it for the shareholder. If you operate through a company, the route to BADR is usually a share sale, which is why the asset-versus-share decision is foundational. We cover that in asset sale versus share sale on a dental practice, and the general qualifying conditions in BADR on a dental practice sale.

One further point about a sole trader or partnership going-concern disposal is that the price is normally split between the goodwill and the tangible assets, and only part of the consideration ends up as a capital gain on which BADR is measured. The equipment slice runs through the capital-allowances system and can carry its own income-tax consequences. That allocation can change the size of the BADR gain itself, so it interacts with the timing question: a different goodwill-versus-equipment split changes the number you are applying 14% or 18% to. We deal with that split in splitting a dental sale price between goodwill and equipment. For the timing decision the headline is simply that the BADR rate is applied to the goodwill gain, and the size of that gain is itself a negotiated figure, not a given.

The £40,000 question, worked

Here is the headline step-up in plain numbers. (BADR 14% to 5 April 2026, 18% from 6 April 2026, £1m lifetime limit.)

Example 1, the £40,000 day. Dr Okafor sells her practice as a sole-trader going concern. After base cost and costs of sale, her qualifying gain is £1,000,000, within the £1m lifetime limit with none used before.

  • Disposal date 5 April 2026: £1,000,000 × 14% = £140,000 CGT.
  • Disposal date 6 April 2026: £1,000,000 × 18% = £180,000 CGT.
  • Difference for one day of disposal timing: £40,000.

Example 2, a gain above the lifetime limit. Dr Mensah has a £1,400,000 qualifying gain, no prior BADR used. The first £1m gets BADR; the excess £400,000 is taxed at the main higher CGT rate (24% on current rules).

  • Disposal 5 April 2026: first £1m at 14% (£140,000) plus £400,000 at 24% (£96,000) = £236,000.
  • Disposal 6 April 2026: first £1m at 18% (£180,000) plus £400,000 at 24% (£96,000) = £276,000.

The rate rise still only moves the first £1m, so the timing difference is again £40,000, not more. The excess £400,000 is taxed the same either way. This is the key insight for larger deals: beating the deadline saves a fixed £40,000 ceiling on the BADR band, not a percentage of the whole gain.

Where the lifetime limit changes the maths

Because the £1m limit is per individual and cumulative, two structural points follow. First, partners and co-shareholders each have their own £1m, so a two-principal practice can bring up to £2m of gain into the BADR rate across the two people, provided each qualifies in their own right. Second, gains above an individual's remaining £1m do not get BADR at all, so the 6 April 2026 lever only ever bites on the first £1m of each person's gain. If you have used BADR before, your remaining band is smaller and the maximum saving from beating the deadline is correspondingly smaller. Map your remaining lifetime limit before you weigh the deadline, because it caps the prize.

What can and cannot be brought forward

The instinct to "just complete before 5 April" runs into the reality of how a practice sale actually moves. A typical deal takes several months from heads of terms to exchange, and several of the gating items are not in the seller's control:

  • Commissioner consent to NHS contract novation. On an asset sale the NHS contract transfers by novation with the commissioner's consent, and some commissioners use the sale as a trigger to renegotiate value. This is a known timeline risk, covered in transferring the NHS dental contract on a practice sale. If your contract is made conditional on that consent, the disposal date moves to the consent date too (see the s.28 point above).
  • Lender timelines. A buyer's finance can add weeks, and a chain of approvals can slip.
  • Due diligence. CQC history, UDA delivery, associate contracts and property title all take time to satisfy.

So "exchange unconditionally before 6 April 2026" is sometimes achievable and sometimes simply is not in the seller's gift. The honest planning posture is to get a realistic exchange date from your broker and solicitor early, and to treat the deadline as something to hit if the deal naturally allows, not something to force.

When chasing the old rate is the wrong call

The rate difference is real, but it is bounded at about £40,000 on the first £1m. Set against that ceiling, the cost of rushing can be much larger.

Example 3, the rate as a tie-breaker, not a strategy. (BADR rates as above; mixed-practice multiples around 0.9 to 1.2× of normalised EBITDA.) Dr Bianchi could complete on 4 April 2026 at a rushed price, or wait to 10 July 2026, after proper EBITDA normalisation lifts the agreed price by 5% on a £1,500,000 deal, adding £75,000 of headline consideration.

  • The rate rise on the first £1m of gain costs at most £40,000 extra by waiting.
  • The 5% better price adds £75,000 of consideration. Treated as extra qualifying gain taxed at 18%, that is £13,500 of CGT, leaving roughly £61,500 net in the seller's pocket.

Waiting for the stronger deal is the better outcome despite the higher rate. A 5% price concession dwarfs the four-point rate step. The same logic applies to an under-normalised EBITDA (which depresses the multiple), or accepting a structurally weaker buyer just to hit a date. The rate rise is a tie-breaker between otherwise equal options. It is not a reason to sell badly.

Interaction with incorporation and the 24-month trap

Sellers who incorporated specifically to enable a share sale face a particular timing constraint. Incorporation relief under TCGA 1992 s.162 (incorporation relief) can roll an unincorporated practice into a company, deferring the gain into the share base cost, so that a later share sale can access BADR. But the two-year BADR clock then runs from incorporation. A practice incorporated late may not be able to make a qualifying share sale before 6 April 2026 at all, so the deadline is moot for that seller. Incorporation as a pre-sale step needs roughly 24 months of lead time to be useful, which is the same lead time EBITDA normalisation wants. Leaving it to the last minute defeats both.

Other timing-sensitive consequences of selling

A sale year rarely stands alone. A few adjacent points worth keeping on the radar:

  • Income spike in the year of sale. Final drawings, a handover consultancy period or a retained associate role can lift income, with knock-on effects on personal allowance tapering and pension taper thresholds.
  • Pension annual-allowance taper. The £60,000 allowance (2025/26) tapers where threshold income exceeds £200,000 and adjusted income exceeds £260,000. A high-income sale year combined with a big pension input can trigger it; the previous three years' unused allowance can sometimes absorb the spike.
  • NHS pension and retirement. If the sale coincides with drawing NHS benefits, the timing of accrual, McCloud choices and any partial retirement need to be coordinated with the disposal.

None of these changes the BADR rate, but each can change the net result of selling in one tax year versus another. The broader CGT picture on a sale is set out in capital gains tax on selling a dental practice.

Deferred and contingent proceeds complicate the timing further

The clean £40,000 step-up assumes a single, fully ascertained gain crystallising on one disposal date. Many practice sales, especially to corporate acquirers, are not paid all at once. Where part of the price is a performance-linked earn-out whose amount is not yet known, the tax shape changes: the right to that future payment is treated as a separate asset valued at the date of sale, and the eventual payout is a second, later chargeable event. The rate-rise lever bites on the gain at the original disposal (the completion cash and the valued earn-out right), but the second event, often taxed at the main CGT rate rather than the BADR rate, is governed by its own later date. So a deferred-consideration deal does not have one neat "disposal date" for all of the money. If your buyer is proposing an earn-out, the timing analysis has to be done slice by slice, which we cover in detail in earn-outs and deferred consideration on a dental practice sale. The practical takeaway for the 6 April 2026 deadline is that fixing the original disposal in the 14% band protects the rate on the up-front gain, but it does not lock the rate on a contingent slice that crystallises years later.

Claiming the relief and keeping the evidence

BADR is not given automatically; it is claimed, normally through the Self Assessment return for the year of disposal, and the claim has its own deadline (broadly the first anniversary of the 31 January following the tax year of disposal). The figure on the return is only as strong as the evidence behind it, and the two-year qualifying conditions are exactly what an HMRC enquiry will test. For a share sale that means contemporaneous proof of your shareholding and voting percentages, your economic entitlement, and your officer or employee status throughout the two years to disposal. For a sole trader or partnership it means evidence the business was trading. In every case keep the sale contract showing the disposal date (the document that proves whether exchange or a satisfied condition fixed your rate), the completion statement, and your base-cost and acquisition-cost records. If a s162 incorporation step preceded the sale, keep that paperwork too, because it underpins both the share base cost and the start of the two-year clock. Good records are what turn the right timing into a relief that actually survives scrutiny.

A sensible decision framework

Putting it together, a disciplined sequence for any seller eyeing the 6 April 2026 step is:

  • Confirm you qualify. Sole trader or partnership trading throughout; or share sale with 5% ordinary shares, 5% votes, economic entitlement and officer or employee status, all held for two years.
  • Confirm the clock is clear. If you incorporated, check the two years from incorporation has run.
  • Map your remaining £1m. Any prior BADR caps the band that the rate rise affects.
  • Get a realistic exchange date from your broker and solicitor, and establish whether your contract will be conditional or unconditional, because that decides which date fixes the rate.
  • Model both rate scenarios on your actual gain, then let the commercial terms lead. Take the deadline only as the tie-breaker.

In practice we have modelled both completion dates for a mixed-practice principal disposing of a gain around £1m and confirmed an unconditional exchange in the 5 April window was achievable without conceding on price, which is the ideal outcome: the lower rate captured and the deal terms intact. The point of the exercise is never to chase a date for its own sake. It is to make sure that, where the lower rate is there for the taking without commercial cost, you do not give away £40,000 by misunderstanding which date counts. Where it would cost you a materially worse deal, you let it go. For sellers weighing a phased exit against the deadline, see gradual versus immediate sale of a dental practice.