Law Firm Partner Capital Accounts: Tax Treatment Explained

Two Accounts, Two Jobs: Capital vs Current

A partner's capital account and current account are two different things, and confusing them causes most of the avoidable tax errors that arise at partner level. The distinction is worth getting clear before anything else. The capital account holds your fixed, long-term investment in the firm, the buy-in, and is broadly fixed unless the partnership agreement changes it. The current account holds the working balance: profit you have been allocated but not yet drawn, plus any interest on capital credited to you, less your drawings. The capital account is your stake in the firm; the current account is the running tally of profit and cash that moves every month.

Both accounts are tracked per partner in the firm's accounts and reconciled at the year-end, and both appear on the firm's balance sheet. The firm is tax-transparent: a partnership or LLP pays no corporation tax on its trading profit, and each partner is taxed personally on their allocated profit share (ITTOIA 2005 section 863). Neither account is itself a taxable event. The tax sits on the profit allocation, not on movements through the accounts. This page answers the four tax questions that flow from that: how a capital contribution is treated going in, how interest on capital is taxed, whether undrawn profit on the current account has been taxed, and how the return of capital on exit is treated.

It helps to picture the two accounts side by side. The capital account is set by the partnership agreement, usually at a fixed sum or a sum geared to the partner's profit share, and it changes only when the agreement requires a top-up or allows a reduction. It is the partner's long-term skin in the game. The current account, by contrast, is a moving figure that is recalculated continuously: profit is credited to it as it is allocated, interest on capital is credited to it, and drawings are debited from it. A partner who consistently draws less than they are allocated will see the current account build up over time; a partner who draws ahead of their allocation will see it fall, and it can go negative. Keeping these two ideas distinct (a fixed investment versus a moving profit-and-drawings tally) is the single most useful thing a partner can do to understand their own tax position.

The Capital Contribution: An Investment, Not Income

The core tax point is simple and frequently misunderstood. When you put capital into the firm, you are funding an ownership stake. It is not taxable income to you on the way in, and it is not a tax-deductible expense on the way in either. You cannot deduct your buy-in from your taxable profit. The contribution simply sits on your capital account as your investment in the firm.

Contrast that with what is taxed: your allocated profit share for the year (ITTOIA 2005 section 850). The amount of capital you have contributed does not change the fact that you are taxed on your share of the firm's profit, nor does it reduce that share. The firm does not get a deduction for your contribution either, because it is a balance-sheet movement (cash in, capital account credited), not a profit-and-loss item. So the act of buying in, taken on its own, is tax-neutral. The cost of borrowing to fund the buy-in can be relievable (covered below), but the capital itself is neither income nor a deduction.

The same logic runs the other way too, which is why it is worth fixing now. Because the contribution was never deducted or taxed going in, the eventual return of that capital is not taxed coming out (covered in full below). The capital account is, in effect, a holding pen for the partner's own money: it goes in untaxed and undeducted, sits as the partner's stake, and comes back out untaxed. Everything that is taxed, year by year, happens on the profit allocation that flows through the current account, not on the capital account. Partners who grasp this stop worrying about the tax on their capital movements and focus, correctly, on the tax on their share.

The Current Account: Where Undrawn Profit Lives

The current account is the running tally of profit you have been allocated but not yet drawn, plus any interest on capital credited to you, less your drawings (and, in firms that operate tax reserves, less amounts held back for your tax). It moves throughout the year as profit is credited and drawings are taken.

The crucial tax link is this: you are taxed on the allocated profit share when it is allocated, regardless of whether you draw it. Undrawn profit credited to your current account has already been taxed on you in the year of allocation. Drawing that balance later is not a second taxable event. This is exactly where partners go wrong, assuming that undrawn profit sitting on the current account is somehow money that has not been taxed yet, to be picked up when it is drawn. It is not. It is already-taxed profit, retained in the firm as working capital and recorded on your current account. For the fuller treatment of why tax follows the allocation rather than the cash, see our guide to law firm drawings versus profit.

Interest on Capital: An Allocation, Not Savings Interest

This is the most misunderstood item in partner accounts, and the one this page exists to put right. Many partnership agreements credit each partner with interest on capital, often a set percentage applied to their capital balance, before the residual profit is shared out. Despite the name, this is not bank or savings interest, and it is not taxed under the savings rules.

Interest on capital is an allocation mechanism. It is the first slice of the partnership's trading profit, allocated to the partner under the profit-sharing arrangement (ITTOIA 2005 section 850). The agreement is simply saying: before we divide the residual profit, allocate a slice to each partner in proportion to their capital. That slice is part of the partner's trading profit share. So it is taxed as trading profit, at income-tax rates plus Class 4 National Insurance (6% on profits between £12,570 and £50,270 and 2% above, 2025/26), exactly like the rest of the share.

The practical consequences matter. Do not report interest on capital in the savings boxes of your tax return: it forms part of the partnership profit share and goes on the partnership pages. It is not covered by the personal savings allowance. And it carries Class 4 National Insurance, which savings income does not. The firm gets no deduction for it, because it is an appropriation of profit (a decision about how to share the firm's profit) rather than an expense. The name says interest; the tax says profit share. For how the wider allocation, including interest on capital, is set under different models, see partner profit allocation in UK law firms.

Why do agreements use interest on capital at all, if it is just profit share by another name? The commercial purpose is fairness between partners. If two partners do equal work and earn equal residual shares, but one has tied up far more capital in the firm, crediting interest on capital rewards the partner who has funded more of the firm's working capital before the rest of the profit is split equally. It is a way of recognising the cost of the capital each partner has committed. That is a perfectly sensible commercial mechanism. The trap is purely in the tax reporting: the word interest invites partners (and sometimes their advisers) to slot it into the savings section, where it does not belong. Once you see it as the first line of the profit-sharing waterfall rather than a return on a deposit, the correct treatment is obvious.

Drawings Against the Accounts: Cash, Not a Tax Point

Drawings reduce the current account, or, if you draw more than has been allocated to you, push it negative. They are advances against your allocated profit share, taken as cash through the year. Drawings are not income in their own right and they are not the measure of your tax. You are taxed on the allocated share, not on what you happened to draw.

This is the bridge between the accounts and the tax: tax follows the allocation, while the accounts simply record the cash plumbing. A partner who under-draws still pays tax on the full allocation; a partner who over-draws does not generate extra taxable income, they just run down their current account. The drawings-versus-profit point is owned by its own page, linked above, so we keep it brief here and move on.

Funding the Capital Account With a Qualifying Loan

If a partner borrows to fund their capital contribution, the loan interest is deductible under the qualifying-loan interest relief rules in ITA 2007 sections 398 to 412. The conditions are precise:

• Qualifying use (section 398): the loan must be used to purchase a share in the partnership, to contribute capital to a partnership used wholly for its trade or profession, to advance money to such a partnership, or to repay another qualifying loan of this kind.
• Member throughout (section 399): you must be a member of the partnership throughout the period from the use of the loan until the interest is paid.
• Not an investment LLP (section 399): relief is denied where the LLP is an investment LLP. A trading law firm is not one.
• Capital recovery (section 399 and sections 406 to 412): relief is withdrawn to the extent you later recover capital from the partnership.

The neat way to hold the two points together: the contribution itself is not deductible, but the cost of borrowing to fund it is relievable, at your marginal rate, claimed on self-assessment. For the cost of buying in and the financing options behind it, see how much it costs to buy into a UK law firm partnership. Note that committing capital of at least 25% of disguised salary is also one of the levers that keeps a fixed-share partner out of the salaried member rules; see our explainer on the salaried member rules.

For most partners, the capital account first appears at the moment of promotion to full equity, which is when the buy-in and the loan to fund it are arranged. If you are at that point, our guide to the fixed-share to equity partner promotion walks the whole status change, the funding and the first tax bill in order; this page is the deeper treatment of the capital account itself once it exists.

Return of Capital When a Partner Leaves: Not Income

On exit, the partner's capital account is settled, often phased over a period set by the partnership agreement. Returning the partner's own capital is not a taxable receipt: it is the return of an investment, not income. Getting your own money back is not an income tax event.

There is a separate question on exit, and it is a capital one. If you dispose of your partnership interest or your share of goodwill for more than you put in, the excess is a chargeable gain under the capital gains tax rules (individual rates 18% and 24% from 30 October 2024), with Business Asset Disposal Relief potentially available on qualifying disposals (14% from 6 April 2025 to 5 April 2026, 18% from 6 April 2026, subject to the £1m lifetime limit and the relief conditions). That is a different cluster of analysis. The distinction to hold is clean: capital back at face value is not taxed; a gain on the interest above what you put in is CGT, not income tax.

One further point ties back to the loan relief above: recovering capital from the partnership can withdraw the qualifying-loan interest relief on any loan still outstanding (ITA 2007 section 399 and sections 406 to 412). So an exit, or any earlier withdrawal of capital, needs to be looked at alongside any relievable loan.

The Tax Point Is the Profit Allocation, Not the Account Movements

Pulling the thread together gives the page's organising principle. The single charge to tax at partner level is on the allocated profit share each year (ITTOIA 2005 sections 850 and 863). You are taxed on the share, not on your drawings and not on the balances sitting in either account.

Look at the four movements in turn. Capital in: not income, not a deduction. Interest on capital: part of the profit share, taxed as trading profit with Class 4 National Insurance. Undrawn profit on the current account: already taxed in the year of allocation, not taxed again when drawn. Capital out on exit: not income (though a gain on the interest is CGT). None of those movements is a separate income-tax event in its own right. They are recorded on the two accounts, while the tax sits squarely on the annual allocation. Hold that principle and the rest follows.

This principle is also why reserving for tax has to be done against the allocation rather than against the balances or the cash. A partner who looks at a healthy current account balance and assumes the tax on it is still to come has misread the position: that balance is already-taxed profit. A partner who looks at a modest current account, because they have drawn heavily, and assumes their tax bill is correspondingly modest has also misread it: the tax follows the full allocation, not the reduced balance. The accounts are a record of cash and stake; the tax is a charge on the share. Keeping the reserving anchored to the allocation, and treating the account balances as information rather than as the tax base, is what stops the common cash-flow surprises at partner level. Our companion guide to tax reserving and payments on account builds the reserve from the allocation in detail.

How This Looks in the Firm's Accounts and Your Return

In practical reporting terms, the partnership return (the SA800) reports the firm's profit and each partner's allocated share. You then report that share, including any interest-on-capital element, on the partnership pages of your personal self-assessment return (the SA100), as trading profit, not in the savings section. The capital and current account balances appear on the firm's balance sheet; they do not appear on your personal return as income.

Two record-keeping habits make all of this easier. Keep documentation of your capital contributions, including any loan used to fund them and how the loan was applied, so the section 398 relief is clean. And keep a clear note of the basis on which interest on capital is credited under the agreement, so it is reported correctly as profit share rather than savings. For the underlying member tax that all of this sits within, see how LLP members are taxed, and for where the share is reported on the personal return, see our solicitor self-assessment tax guide.

Worked Sketches

The following are illustrative only, anonymised, and not advice.

Capital in is not income. A new partner contributes capital to the firm. Nothing is taxed on them on the way in: it is an investment, recorded on their capital account, neither income nor a deduction. They are taxed only on their allocated profit share for the year. The buy-in is not a tax event; the profit share is.

Interest on capital is taxed as profit share, not savings. A partnership agreement credits a partner with interest on their capital balance before the residual profit is split. Despite the label, this is the first slice of the profit allocation (section 850), taxed as trading profit with Class 4 National Insurance (6% then 2%, 2025/26), reported on the partnership pages, not in the savings boxes and not covered by the personal savings allowance. The name says interest; the tax says profit share.

Undrawn profit and the current account. A partner is allocated profit but draws less than the allocation. The undrawn balance is credited to their current account. They were taxed on the full allocation in the year it was allocated; drawing the balance later is not taxed again. The current account holds already-taxed profit, not untaxed money.

Capital back on exit. A retiring partner's capital is returned, phased over the period set by the agreement. The return of their own capital is not income. Any value received above what they put in (a gain on the interest or goodwill) is a separate capital gains tax question, where Business Asset Disposal Relief may apply. Capital back is not income; a gain on the interest is CGT, not income tax.

Getting the Treatment Right: Speak to a Specialist

Several moving parts interact here: how the agreement defines interest on capital and any current-account interest, clean loan documentation so the qualifying-loan relief stands up, and the terms on which capital is settled on exit. Getting the agreement drafting and the reporting right at the outset avoids the common errors, particularly the misclassification of interest on capital as savings income, which can quietly distort returns for years.

Every firm's capital structure is different, and the figures and the treatment depend on the partnership agreement and your own funding. If you are a partner or a firm reviewing how the capital and current accounts work and how the movements are taxed, speak to a legal-sector-specialist accountant who can review the agreement and confirm the treatment against your arrangement.