Architects — Self-Employed vs Limited Company Tax Guide

The Accounted Business Team·2 March 2026·8 min read

Whether you have just qualified through the RIBA Part 3 or you have been running your own practice for years, one question keeps cropping up: should you work as a self-employed sole trader or set up a limited company? The answer depends on your income, your plans for growth, and how much admin you are willing to take on.

This guide walks you through the tax obligations, allowable expenses, and structural decisions that matter most for architects working in the UK during the 2025/26 tax year.

How Most Architects Start Out

The majority of newly qualified architects begin their careers as employees in established practices. But increasingly, architects are branching out — taking on private residential projects, conservation work, or commercial fit-outs as self-employed professionals.

If you are earning income directly from clients rather than through a single employer's payroll, you are likely trading as a sole trader. That means you need to register with HMRC as self-employed and file a Self Assessment tax return each year.

Registering as Self-Employed

You must register with HMRC by 5 October in your business's second tax year. In practice, it is best to register as soon as you start trading. You will receive a Unique Taxpayer Reference (UTR) number, which you will need for your tax returns.

As a sole trader architect, your income tax works like this for 2025/26:

Personal allowance: The first £12,570 of your total income is tax-free.
Basic rate: You pay 20% on earnings between £12,571 and £50,270.
Higher rate: Anything above £50,270 is taxed at 40%.

On top of income tax, you will also pay National Insurance contributions. Class 2 NI is £3.45 per week, and Class 4 NI is charged at 6% on profits between £12,570 and £50,270. You can read more about how these work in our National Insurance for sole traders guide.

Expenses Architects Can Claim

One of the biggest advantages of being self-employed is the ability to deduct legitimate business expenses from your taxable profit. For architects, these can be substantial.

Software and Technology

Architecture is a software-heavy profession. Subscriptions to tools like AutoCAD, Revit, SketchUp Pro, Adobe Creative Suite, and rendering software such as V-Ray are all fully deductible. The same goes for your computer hardware — laptops, monitors, graphics tablets, and even 3D printers used for model-making.

Professional Fees and Memberships

Your annual RIBA membership, ARB registration fee, and any Continuing Professional Development (CPD) courses are all allowable expenses. If you pay for professional indemnity insurance — which is a requirement for practising architects — that is deductible too.

Travel and Site Visits

Architects spend a significant amount of time visiting sites, meeting clients, and attending planning meetings. You can claim mileage at the approved HMRC rates (45p per mile for the first 10,000 miles, 25p thereafter) or actual vehicle costs if you prefer. For more detail, see our mileage claims guide.

Office and Studio Costs

If you rent a studio or co-working space, the full cost is deductible. If you work from home, you can claim a proportion of your household bills — heating, electricity, broadband, and even a share of your rent or mortgage interest. HMRC also allows a simplified flat-rate deduction based on the hours you work from home each month.

Other Common Expenses

Printing, plotting, and model-making materials
Postage and courier costs for planning submissions
Books, journals, and technical publications
Client entertainment (note: this is not tax-deductible for income tax, but worth tracking for your records)
Stationery and office supplies
Accountancy fees

For a comprehensive list, take a look at our sole trader expenses guide.

Self-Employed vs Limited Company — The Key Differences

Once your practice starts generating decent revenue, you will inevitably wonder whether incorporating as a limited company makes financial sense. Here is a straightforward comparison.

Tax Efficiency

As a sole trader, all your profit is subject to income tax and National Insurance. As a limited company director, you can pay yourself a combination of a small salary (typically around the NI threshold) and dividends. Dividends are taxed at lower rates than salary — 8.75% at the basic rate, 33.75% at the higher rate — which can produce meaningful tax savings once your profits exceed roughly £40,000 to £50,000 per year.

However, limited companies pay Corporation Tax on their profits before dividends are extracted. For the 2025/26 tax year, the rate is 25% for profits over £250,000 and 19% for profits under £50,000, with marginal relief in between.

Administrative Burden

Running a limited company involves more paperwork. You will need to file annual accounts with Companies House, submit a Corporation Tax return, run payroll (even if it is just for yourself), and maintain statutory records. Many architects find this manageable with the help of an accountant, but it is worth factoring in the additional cost.

Professional Indemnity and Liability

One significant benefit of a limited company is limited liability. If something goes wrong on a project — a structural issue, a planning dispute, a negligence claim — your personal assets are generally protected. As a sole trader, you are personally liable for all debts and claims against your business.

That said, most architects carry professional indemnity insurance regardless of their business structure, which provides a practical layer of protection either way.

When to Consider Incorporating

There is no magic number, but as a general rule, if your annual profits consistently exceed £40,000 to £50,000 and you do not need to draw all the money out of the business immediately, a limited company structure may save you tax. For a deeper comparison, have a read of our sole trader vs limited company guide.

VAT — Do Architects Need to Register?

You must register for VAT if your taxable turnover exceeds £90,000 in any rolling 12-month period. For architects working on commercial projects or high-value residential schemes, this threshold can be reached quickly.

The Impact on Residential Work

Here is where it gets interesting for architects. Most new-build residential construction is zero-rated for VAT purposes, meaning you do not charge VAT on your architectural services related to new dwellings. However, renovation, extension, and alteration work on existing dwellings is standard-rated at 20%.

This distinction matters because if a large proportion of your work is zero-rated, you may still be able to reclaim VAT on your business expenses without adding 20% to your fees for clients. It is worth discussing the specifics with your accountant.

If you are approaching the threshold, our VAT registration guide explains the process and options available to you.

IR35 and Contract Work

Many architects work on a contract basis for larger practices, developers, or local authorities. If you operate through a limited company and work for a single client who controls how, when, and where you work, you may fall within the IR35 rules.

Being caught by IR35 means your income is taxed as if you were an employee, which removes most of the tax advantages of a limited company. Since April 2021, medium and large clients are responsible for determining your IR35 status, but you should still understand how these rules affect you. Our IR35 guide covers this in detail.

If you are genuinely self-employed — working for multiple clients, using your own equipment, and controlling your own schedule — IR35 is unlikely to be an issue.

Record-Keeping and Making Tax Digital

From April 2026, sole traders and landlords with income over £50,000 will need to comply with Making Tax Digital for Income Tax (MTD for ITSA). This means keeping digital records and submitting quarterly updates to HMRC.

If your architectural practice generates over £50,000 in gross income, you will need MTD-compatible software. Tools like Accounted are designed to make this straightforward — Penny, the AI bookkeeping assistant, can help categorise your transactions automatically so you are not spending your evenings sorting receipts when you could be designing.

What Records to Keep

HMRC expects you to keep records of all income and expenses for at least five years after the 31 January submission deadline for the relevant tax year. This includes:

Invoices issued to clients
Receipts for all business purchases
Bank statements
Mileage logs
Records of any assets purchased (computers, equipment, etc.)

Planning Ahead — Pensions and Tax Relief

Self-employed architects do not have the benefit of employer pension contributions, so it is important to make your own arrangements. Contributions to a personal pension or a Self-Invested Personal Pension (SIPP) receive tax relief at your marginal rate.

If you are a basic-rate taxpayer, every £80 you contribute is topped up to £100 by HMRC. Higher-rate taxpayers can claim additional relief through their Self Assessment return. This is one of the most tax-efficient ways to reduce your overall tax bill while building long-term wealth.

Getting Your Tax Right as an Architect

Architecture is a rewarding profession, but the financial side can be complex — especially when you are juggling multiple projects, managing cash flow around stage payments, and trying to work out whether incorporation is worth it.

The key takeaways are:

Register early with HMRC and stay on top of your tax obligations.
Track all your expenses — software, travel, CPD, and insurance add up quickly.
Review your business structure annually as your income grows.
Plan for VAT if your turnover is approaching £90,000.
Think about pensions — tax relief makes contributions very efficient.

Accounted helps UK sole traders stay on top of their bookkeeping and tax. Start your free 30-day trial at getaccounted.co.uk

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