Accountant for Architects: Choosing and Taxing Your Practice Structure

The decision that moves the most money in an architecture practice is not which software you buy or which reliefs you chase. It is whether you trade as a sole practitioner, as a limited liability partnership (LLP), or through a limited company. That choice sets how your profit is taxed, what happens if a claim lands, and how much administration you carry every year. Work through it first, with your actual profit figure, and the rest of the practice's tax follows from it.

Sole practitioner, LLP or limited company

Structure is a trade off rather than a ranking. Each option has its own tax, liability and administration profile, and the answer changes as the practice grows.

Sole practitioner

You and the practice are the same legal person. Profit is taxed as your income, at 20% above the personal allowance, 40% above the higher rate threshold and 45% above £125,140, plus Class 4 National Insurance at 6% between £12,570 and £50,270 and 2% above that. The personal allowance of £12,570, the £50,270 higher rate threshold and the 6% Class 4 rate are the rates set for 2025/26, still current when this page was checked in August 2026. Liability is unlimited, which is the part that matters for a profession carrying professional indemnity exposure on buildings that outlive the fee. Administration is light: one Self Assessment return, and Making Tax Digital for Income Tax from 6 April 2026 if qualifying income is over £50,000.

General partnership and LLP

Two or more architects in practice together are taxed the same way whether they use a general partnership or an LLP. Both are tax transparent: the firm files a partnership return but pays no income tax itself, and each member is taxed individually on their profit share under the profit sharing arrangement for the period. The difference is liability. In a general partnership it is joint and several. An LLP is a separate legal person registered at Companies House, so members' liability is limited, at the price of filing accounts publicly.

Practices choose the LLP when they want partnership economics with a liability wall. What it does not do is reduce the tax bill, because the members are still taxed at personal rates on the whole profit whether they draw it or leave it in the firm. Our page on personal tax for LLP members walks the member side of that.

Limited company

The practice becomes a separate legal person and pays corporation tax on its profit: 19% where profits do not exceed £50,000, 25% where they exceed £250,000, and marginal relief in between, which taxes the slice from £50,000 to £250,000 at an effective 26.5%. Those limits are divided between associated companies, so a second company you control halves them. You are then taxed personally when you take money out, as salary or as dividends. The company can keep profit inside itself, taxed only once until extracted, which is where it starts to win. Corporation tax is due nine months and one day after the period end.

Worked example: Eryn's practice in Southampton

Eryn runs a two person architecture practice in Southampton. Fee income after all business costs but before anything paid to her leaves £80,000 of profit for 2026/27, and she needs all of it to live on. She has no other income.

As a sole practitioner. Her taxable income is £80,000. The personal allowance covers £12,570. The basic rate band from £12,570 to £50,270 is £37,700 taxed at 20%, which is £7,540. The remaining £29,730 above £50,270 is taxed at 40%, which is £11,892. Income tax is £19,432. Class 4 National Insurance is 6% on the same £37,700, which is £2,262, plus 2% on £29,730, which is £594.60, so £2,856.60. Total tax and National Insurance is £22,288.60 and she keeps £57,711.40.

Through a limited company. She takes a salary of £5,000, at the secondary threshold, so the company pays no employer National Insurance on it. Company profit after that salary is £75,000. Corporation tax is 19% on the first £50,000, which is £9,500, plus the effective 26.5% marginal rate on the next £25,000, which is £6,625, so £16,125. That leaves £58,875 to pay out as dividends.

Her personal position: the £5,000 salary uses part of the personal allowance, leaving £7,570 of it to cover dividends, and the £500 dividend allowance sits on top. Of the dividends falling inside the basic rate band, £37,200 is taxed at the ordinary rate of 10.75%, which is £3,999. Her total income is £63,875, so £13,605 sits above £50,270 and is taxed at the upper dividend rate of 35.75%, which is £4,863.79. Personal tax is £8,862.79. Adding corporation tax gives £24,987.79 of total tax, and she keeps £55,012.21.

The sole practitioner route leaves Eryn £2,699.19 better off on those numbers, because full extraction pays tax twice. Change one assumption and the answer flips: if she only needed £45,000 to live on and left the rest in the practice to fund a hire, the retained profit would carry corporation tax only, and the company would win. Dividend rates of 10.75%, 35.75% and 39.35% apply from 6 April 2026, and the £500 dividend allowance is unchanged. You can run your own numbers with the sole trader versus limited company calculator, and the comparison of company against LLP for a consultancy practice is set out in our limited company versus LLP guide.

The salaried member trap in an architecture LLP

When a practice promotes an associate to fixed share member, the salaried member rules become live. HMRC taxes an LLP member as an employee where all three conditions are met: at least 80% of their reward is disguised salary, they have no significant influence over the affairs of the LLP, and their capital contribution is under 25% of expected disguised salary. The Supreme Court in BlueCrest, decided in July 2026, held that significant influence has to come from a legally enforceable governance right in the members' agreement or in statute, not from the informal weight a senior architect carries in the studio. That narrows the escape route that many mid sized professional practices had relied on. Treat it as a risk to review with your accountant when you draft the promotion, not after the first tax year has closed.

Accounting software for architects

Searches for architect accounting software imply a specialist product exists. It does not, in the sense of a ledger built for the profession. What a practice actually runs is two layers.

The first layer is a general cloud ledger, Xero, QuickBooks or FreeAgent. All three keep the digital records that Making Tax Digital requires, all three handle VAT returns, and all three are what your accountant will work in. The second layer is project accounting: tracking fees, time and resource against RIBA work stages so you can see whether stage 4 is running over the fee you quoted. That is where practice management tools sit, and they earn their cost once you have several projects running at once and staff time to allocate. A single handed practice with four projects a year gets that from a spreadsheet and loses nothing.

Both points below cost real money when missed. Staged fee billing means invoiced does not equal earned, so agree with your accountant how work in progress is carried at year end before the accounts are drafted rather than after. And if your practice management tool exports to the ledger, test the export on a real month before you commit, because re keying invoices is the cost that quietly outlasts the licence saving.

VAT for an architecture practice

Architectural services are standard rated at 20%. Registration is compulsory once taxable turnover exceeds £90,000 in any rolling 12 months, or when you expect to exceed £90,000 in the next 30 days. The rolling test catches practices out: a large fee landing in month 11 can trigger registration even though the annual accounts look comfortably under. Once registered, you can only deregister if turnover falls below £88,000.

Most practices bill VAT registered developers and commercial clients who reclaim the VAT, so registration is close to neutral. Practices working mainly for private homeowners feel it as a real 20% on the fee, which is worth modelling before turnover crosses the line. Our VAT threshold guide covers the rolling calculation in detail. Making Tax Digital for VAT has applied to every VAT registered business since April 2022, so digital records and compatible software are already the baseline.

Capital allowances on studio equipment and fit out

Workstations, large format plotters, servers, survey equipment, virtual reality kit and studio fit out are plant and machinery. The Annual Investment Allowance gives 100% relief on up to £1,000,000 of qualifying spend per 12 month period, which is above anything a normal practice will spend, and it cannot be carried forward if unused.

Two changes matter for spend from 2026. A 40% first year allowance applies to new and unused main rate plant and machinery bought on or after 1 January 2026, available to companies and unincorporated practices, though for most practices the Annual Investment Allowance at 100% is still the better claim. And the main rate writing down allowance falls from 18% to 14%, for company periods from 1 April 2026 and unincorporated periods from 6 April 2026, so anything that lands in the pool rather than getting full relief now unwinds more slowly. The special rate pool for integral features such as heating, lighting and ventilation stays at 6%. The mechanics, including how a straddling period is handled, are in our capital allowances guide, and if you buy rather than lease your studio the fixtures apportionment on the purchase is covered in capital allowances on property. Practices that search for accountants for architects and surveyors usually want that property side handled too, and the same apportionment rules apply to a surveying practice buying premises.

Deductions specific to practising architects

These three recur on every architecture practice's accounts, and each is deductible where it is incurred wholly and exclusively for the business:

• Architects Registration Board (ARB) registration. Registration is what allows you to use the title architect, and the annual retention fee is a cost of practising. An architect employed by a practice claims it, and approved professional subscriptions, under the approved list rules through their own tax return or PAYE code rather than through the practice.
• Professional subscriptions, including Royal Institute of British Architects membership where it is held for the practice.
• Professional indemnity insurance. Premiums are a business cost, and run off cover for a closed practice remains deductible against the practice's final period where it is contracted for as part of winding down.

Design consultancy is outside the scope of the Construction Industry Scheme, so paying another consultant for design input does not make you a contractor under the scheme. If your practice moves into actual construction operations, that is a different business and the rules do bite: see our Construction Industry Scheme guide.

Research and development relief: what the rules say

Architecture is heavily marketed as a research and development claim opportunity. The statutory test is narrower than the marketing. Relief requires an advance in science or technology and scientific or technological uncertainty that a competent professional in the field could not readily resolve. Design work, however original, is not an advance in science or technology. Work done to meet building regulations, standards or planning conditions is not an advance. Aesthetic change is not an advance.

Where a project does involve a genuine technological advance, for example developing a new material behaviour or a novel structural technology whose performance cannot be determined from existing knowledge, the current regime applies to accounting periods beginning on or after 1 April 2024: a merged scheme giving a 20% expenditure credit, and Enhanced R&D Intensive Support for loss making small and medium companies whose qualifying research and development spend is at least 30% of total expenditure. Those are the facts. Whether any part of a given project meets the advance test is a technical question about that project, and the honest answer for most architecture work is that it does not.

Paying yourself from a limited practice

If you incorporate, extraction is the next decision. The usual pattern is a modest salary plus dividends. A single director company generally sets salary at the £5,000 secondary threshold, because employer National Insurance runs at 15% above that from 6 April 2025 and the Employment Allowance of £10,500 is not available to a company whose only employee is a single director. A practice with at least one genuinely employed person other than a director can claim that allowance, which usually makes a salary at the £12,570 personal allowance the better setting.

Above the salary, dividends are paid from post tax profit with a £500 allowance, then taxed at 10.75%, 35.75% and 39.35% from 6 April 2026. Watch the director's loan account while you are at it: drawings ahead of a declared salary or dividend leave the account overdrawn, and a balance outstanding nine months and one day after the period end triggers a charge at 35.75% on loans made from 6 April 2026, repayable once the loan is cleared. The 2026/27 dividend rates page sets out the bands.

What to ask an accountant before you appoint one

There is no genuine architect specialism in UK accountancy. The firms that advertise one are general practices with a sector page, which is fine as long as you test the things that actually affect a practice. Ask how they would handle work in progress on staged fees, what they would want to see before supporting a research and development claim, whether they will model the structure fork at your profit level rather than assert an answer, and what their fee covers when a member joins or leaves. A firm that answers the first and third of those clearly is worth more to your practice than one with an architect page.

Location matters less than practices expect. Practices in London file under exactly the same rules as one in Southampton, and cloud bookkeeping means your accountant's address changes nothing about your tax. Choose local only if you genuinely want to meet in person.

If you want your practice's structure modelled on your own numbers, get in touch.