When a salaried or sessional GP is offered a partnership, the broad question of whether to become a partner soon gives way to a much more practical one: what do I actually pay to come in, and what does that money buy? This page answers exactly that. It isolates the capital buy-in, explains parity (the route from a reduced share to a full, equal profit share over an agreed period), and sets out how the buy-in figure is set and valued. It is the money-and-mechanics page for joining a partnership, not a wide-angle look at the pros and cons.
The wider financial picture of becoming a partner, the move from employee to self-employed, drawings versus profit, Class 4 National Insurance, the NHS pension and the deed checklist, is covered in full in our guide to the financial implications of becoming a GP partner. Read that for the consequences. This page stays on the buy-in itself. It is general information, not personal advice.
What a Buy-In Actually Is (and What It Is Not)
A buy-in is a payment, or a credit built up over time, into the partnership capital accounts, representing the incoming partner's share of the practice's net assets. Those net assets are the things the partnership owns less what it owes: the equipment and fixtures, the working capital, and any share of owned premises. The buy-in brings your capital account up to a level comparable with an existing partner's, so that all partners hold a broadly equivalent stake.
What a buy-in is not is a payment for NHS goodwill. The sale of NHS GP goodwill has been prohibited since 1 April 2004, with the current rules in the Primary Medical Services (Prohibition on the Sale of Goodwill) Regulations 2019 (SI 2019/251). A GP, or anyone acting on their behalf, cannot sell the goodwill of an NHS medical practice, nor company shares whose value includes that goodwill. The only goodwill that can ever legitimately feature is goodwill attaching to genuinely private, non-NHS work, which is usually small or nil in an NHS-led practice. For the goodwill rules in full, see our guide to whether GP practice goodwill can be sold.
This matters because buy-ins in some other professions are framed as a multiple of profits or goodwill. In an NHS GP buy-in there is no goodwill multiple. The number is driven by net assets and, where relevant, premises valuation. If you arrive at the table expecting to negotiate a goodwill price, you are working from the wrong model. Our broad financial implications guide sets the buy-in in the context of the whole decision; here we stay with the mechanics.
It also helps to be clear about the direction the money flows. The buy-in is not a cheque written to the outgoing or existing partners as a personal reward for letting you in. It is a contribution into the partnership itself, recorded as your stake in the capital accounts, so that you own your fair share of the assets you will be using and benefiting from. Where an outgoing partner is leaving at the same time, their capital is returned to them through a separate buy-out, and the two events are accounted for separately even if they happen on the same day. Keeping the buy-in and any buy-out distinct in your mind avoids the common confusion that you are paying the leaver for the privilege of joining.
The Two Things You Might Be Buying Into: Net Assets and Premises
The Net-Assets Share (the Capital Account)
The net-assets share is the core of most buy-ins. The partnership owns equipment, fixtures and fittings and holds working capital; it also owes money to creditors and lenders. The difference is the net assets, and those net assets are divided between the partners through their capital accounts. An incoming partner usually contributes capital to bring their capital account up to the level of an existing partner's, funding their share of the working capital and the tangible assets.
If you are not sure how a capital account is presented or how it differs from a current account, our guide to reading GP partnership accounts walks through both. In short, your capital account is your long-term stake in the practice's net assets and changes only on events such as a buy-in, a buy-out or a property revaluation, while your current account is the running year-to-year tally of profit allocated to you less what you have drawn.
The level at which your capital account is set is a negotiation, not a fixed formula. Some partnerships expect every partner to hold an equal capital stake, so a new joiner contributes enough to match the others. Others run with unequal capital accounts, reflecting different sessions, different premises shares or simply history, in which case the question becomes what level you are expected to reach and over what timescale. Read the most recent balance sheet alongside the partners' capital accounts to see where the existing partners sit, because that tells you what level you are being asked to match and whether the figure being quoted to you is consistent with the accounts. A buy-in figure that does not reconcile to the net assets in the accounts is a question to raise, not a number to accept.
The Premises Share (Often a Separate Decision)
Surgery premises are a bigger feature for GPs than for most professions, and they are frequently held in a separate property partnership or LLP alongside the medical partnership rather than inside it. That structure means buying into the practice and buying into the premises can be two separate transactions. A new partner may join the medical partnership but not, yet or ever, the property; or may buy a premises share funded by a separate facility.
Premises valuation is property-specific and assessed by a surveyor or the District Valuer, so there is no standard figure. The property economics are also shaped by how income support flows: notional rent for owner-occupiers (a current-market-rent basis, District Valuer assessed) or the legacy cost rent scheme. For the underlying decision of whether to own or rent, see our guide to owning versus renting surgery premises, and for the standing-liability risk that attaches to a premises share, our guide to last-man-standing premises risk. We touch premises here only as a component of the buy-in valuation; those two pages cover the ownership decision and the risk in depth.
Because the property is so often a separate transaction, it is worth deciding early whether you want to buy into it at all. Owning a share of the surgery brings a share of the notional-rent income and, over the long term, a share of any capital growth in the building, which many GPs regard as a genuine asset within their wider financial plan. Against that, it brings borrowing, a long-term liability and the last-man-standing exposure if the partnership shrinks. Some incoming partners deliberately join the medical partnership first and consider the property later, once they have seen the practice from the inside. There is no single right answer, but it is a decision to make consciously rather than have made for you in the heat of the buy-in negotiation.
Parity: Working Up to a Full Profit Share
What Parity Means
Parity is the point at which a partner holds a full, equal share of profits, subject to the allocation method set out in the deed. The common practice is to bring an incoming partner in on a reduced share and step them up to parity over an agreed parity period (sometimes called the incremental period). The reduced starting point reflects that a new partner may initially do fewer sessions, carry less capital, or be on a trial footing.
Parity periods and starting shares vary widely by practice and are set in the deed, so we deliberately do not state a standard length or a standard starting percentage; any figure quoted as typical is illustrative only. What matters is that you read the specific timetable in the deed you are being offered, and understand what triggers each step up.
How Parity Interacts With the Buy-In
The share you work up to often tracks the capital you contribute and the sessions you commit. A partner building to a full share may build their capital account up in parallel. Be aware that "parity" can mean either an equal profit share or equal capital, and the deed should make clear which it intends, because the two do not always move together.
For tax, the key point is that a GP partner is taxed on their allocated profit share, not on their drawings. During the parity period you are taxed on whatever share has been allocated to you for that year, whatever cash you have actually drawn. Our guides to GP partnership profit sharing and tax planning and drawings versus profit and tax reserving cover how shares are allocated and why you reserve against your share rather than your drawings.
The interaction with parity has a practical consequence that catches new partners out. In the early years your allocated share may be rising while your capital account is still building, so your taxable profit can climb faster than the cash you feel comfortable drawing. If you are also servicing a loan to fund the buy-in, you may be reserving for a growing tax bill, repaying borrowing and building capital all from the same income stream. None of this is a reason to avoid partnership, but it is a reason to map the parity timetable against your own cash flow from the outset, rather than assuming a full share simply means more money in your pocket from day one.
Mutual Assessment Versus Parity
Many practices run a mutual assessment period before offering parity or permanency, a trial stretch during which both sides decide whether to commit. That period, and the financial due diligence you should do during it, is a topic in its own right. We cover it fully in our guide to the GP partnership mutual assessment period and what to check. Here we assume you have decided to join and focus on the money you pay and how it is calculated.
How the Buy-In Cost Is Set and Valued
The Starting Point: the Partnership Accounts
The buy-in is anchored to the net assets per the most recent accounts, or a valuation drawn up specifically for the transaction, divided to give the incoming partner's share. Tangible assets may be taken at book value or revalued for the deal; the deed and the negotiation decide which. To make sense of the accounts the figure is drawn from, our guide to reading GP partnership accounts shows you what each section means.
Premises Valuation
Where premises are bought, the property share is valued on a current-market basis, surveyor or District Valuer assessed, separately from the medical-partnership net assets. Again there is no standard figure, because this is property-specific. If you are buying into the property as well as the practice, treat the premises valuation as its own piece of work alongside the net-assets calculation.
Working Capital
Part of the buy-in is your share of working capital, the cash the practice needs to fund the gap between paying staff and other costs and receiving its NHS income. A partner who joins with a low or nil capital account may build their working-capital share up from undrawn profit over time rather than paying cash up front; the deed sets the mechanism. Either way, working capital is a genuine part of what you are buying into, not an afterthought.
Working capital is easy to overlook because it is not a visible asset like a building or a piece of equipment, but it is what keeps the practice solvent month to month. NHS income arrives in arrears and on a rhythm that does not always match the practice's outgoings, so the partners collectively fund the float that bridges the gap. When you join, you take on your share of that float, which is why the buy-in is rarely just the value of the tangible assets. Understanding the working-capital element also helps you read the cash-flow demands of your first year, because a practice running on thin working capital will expect its partners to keep their drawings disciplined.
What Is Explicitly Excluded
To be clear once more: there is no NHS goodwill in the figure, because it cannot be sold. The buy-in is therefore net-assets-and-premises driven, not a profit multiple. The only goodwill that could legitimately feature is genuinely private, non-NHS goodwill, which is usually small or nil in a typical NHS-led practice. Our complete guide to GP partnership tax sets the capital-account and goodwill position in its wider context.
Paying the Buy-In: Cash, or Building It From Profit
There are two common routes, and the right one depends on the deed and on your own circumstances. The first is paying capital in, often funded by a partnership-capital loan. The second is leaving in undrawn profit so that your capital account builds over the parity period. Paying in gives you a full stake sooner but means borrowing or finding cash; building from profit means lower borrowing but lower drawings while the capital accumulates.
How you fund the buy-in, and the tax relief available on a loan taken out to do it, is covered in detail in our guide to financing a GP partnership buy-in. We do not repeat the interest-relief rules here. The cash-flow point to carry over is that, because a partner is taxed on profit share rather than drawings, your drawings are set against anticipated profit and trued up at year-end, as explained in the broad implications guide and our drawings versus profit page.
The Capital Guarantees and Liabilities That Come With the Stake
Buying in can bring more than an asset share. You may be asked to give capital guarantees for practice borrowings or lease commitments, and, where you buy premises, you may take on exposure to the property liability and the last-man-standing risk if partners leave and are not replaced. These are part of the risk picture rather than immediate cash, but they belong in your assessment of what the buy-in really commits you to. We cover the standing-liability risk in our guide to last-man-standing premises risk, and the wider risk-and-reward balance in the financial implications guide.
The distinction between what you pay now and what you might be liable for later is worth holding onto. The buy-in is the cash or capital you commit on joining. The guarantees and liabilities are contingent: they crystallise only if something goes wrong, such as the practice defaulting on a loan or partners departing and leaving a lease unsupported. A buy-in that looks modest in cash terms can still carry significant contingent exposure if it comes with personal guarantees on a large borrowing or a long lease. Ask for the full picture of both, the upfront contribution and the standing commitments, so that you are comparing the true cost of joining rather than just the headline buy-in figure. This is precisely the kind of point a medical accountant and a specialist solicitor should pin down together before you sign.
Questions to Ask About the Buy-In Before You Agree It
Before you commit to a buy-in figure, get clear answers, in writing, to the following. These are buy-in mechanics; the wider pre-commitment due diligence and the general deed checklist are covered on the pages linked below.
- What exactly does the buy-in represent in the capital accounts: net assets, working capital, premises share?
- Is the premises a separate transaction, and am I buying into it?
- What is the parity timetable and the starting share, and what triggers each step up?
- How is the figure valued: book value or revaluation, and who values the premises?
- Do I pay cash, build capital from undrawn profit, or borrow to fund the contribution?
- What capital guarantees or liabilities attach to the stake?
For the checks to do before you commit to any of this, see our guide to the mutual assessment period and financial due diligence. For the deed-signing checklist and the broad picture, see the financial implications of becoming a GP partner.
How We Help GPs Joining a Partnership
We work with GPs across the UK on the move into partnership, with a particular focus on the buy-in itself: reading the partnership accounts the figure is drawn from, sense-checking how net assets, working capital and any premises share have been valued, and modelling how a parity timetable interacts with your drawings, your tax reserving and your cash flow. Where a premises share is involved, we coordinate with the surveyor and your solicitor so the property side is valued and documented properly rather than glossed over.
The aim is simple: you should understand precisely what you are paying, what it buys, and how the figure was reached, before you sign. You can read more about how we support GPs on the for GPs page, or get in touch to talk through a specific buy-in. The wider GP tax and accounts category collects our related guides.