Katy Proctor
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If you run a third-party logistics company in or around London, your margins live or die on operational efficiency and the tax side gives you levers most 3PL operators never pull. Specialist 3PL accounting is different because logistics sits at the intersection of property, transport, technology and labour, and each of those carries its own reliefs. Pulled properly, capital allowances on warehouse fit-outs, full expensing on fleet and plant, and R&D tax relief on technology can free up six-figure sums to reinvest. This guide explains exactly where the money is in 2026, and how an ambitious limited company should be thinking about it.
Most accountants treat a 3PL like any other service company, and most 3PL operators underclaim as a result. A third-party logistics business is really four businesses stacked on top of each other for tax purposes:
On top of that, you hold inventory that belongs to your clients, not to you, which carries VAT and accounting implications general-practice accountants routinely miss. Getting all four right requires an accountant who understands how a 3PL actually operates. Getting it wrong leaves money on the table every single year.
This is the single most underclaimed area for London 3PL businesses. Every warehouse fit-out — racking, mezzanine flooring, dock levellers, lighting upgrades, security systems, MHE charging infrastructure, refrigeration for cold chain, and even certain elements of the building's electrical and plumbing systems — generates qualifying expenditure for capital allowances. The catch is that these costs only get claimed if they're identified and separated out correctly. An accountant who treats the whole fit-out as one lump of "property expense" leaves substantial relief on the table.
The two main mechanisms in 2026:
What changed for 2026, and why timing now matters: from April 2026, the writing-down allowance on the main pool falls from 18% to 14%. In plain terms, anything you don't claim upfront assets that drift into the pool rather than being expensed in year one, now attracts relief more slowly than before. That makes correctly identifying full-expensing and AIA-qualifying spend, and timing major purchases, more valuable than it was even twelve months ago.
For older warehouses with historic fit-outs, retrospective capital allowance claims are often possible going back several years. This is one of the most common areas where a sector-aware accountant pays for themselves several times over on the very first claim.
Your fleet sits in a different capital-allowances category, and the 2026 rules tilt heavily towards electric and low-emission vehicles — which also happen to sidestep ULEZ entirely.
Two further points to factor into longer-term planning: the VED Expensive Car Supplement threshold for EVs rises from £40,000 to £50,000 from April 2026, and a new mileage-based charge (3p per mile for EVs, 1.5p for plug-in hybrids) is due from April 2028. None of these changes the basic case for electrification for inner-London and last-mile operations, but they do mean the right answer is a proper total-cost-of-ownership calculation — capital allowances, ULEZ exposure, fuel, maintenance, residual values and the realities of your network — not a back-of-an-envelope guess. That's a conversation your accountant should be having with you every year as part of business planning.
A note on structure: the new 40% first-year allowance introduced from January 2026 is aimed mainly at leasing businesses and unincorporated firms — sole traders and partnerships — precisely because they can't access full expensing. If you're scaling and still unincorporated, this is a strong signal that it's time to review your structure.
More often than operators expect — and this is the second biggest underclaimed area in the sector. R&D tax relief is not just for software houses and laboratories. Any company resolving genuine technical uncertainty in the course of its work can potentially qualify, and for a 3PL that frequently includes:
What it's worth in 2026: under the merged R&D scheme (for accounting periods beginning on or after 1 April 2024), qualifying expenditure attracts a 20% above-the-line expenditure credit. For a profitable company that nets out at roughly 15% of qualifying spend; for a loss-making company, up to around 16.2% as a payable credit — broadly £15,000 to £16,200 back for every £100,000 of qualifying R&D. For a growing 3PL investing seriously in technology, that adds up quickly.
The catch: the rules tightened significantly in 2023 and 2024, and HMRC's scrutiny of R&D claims is now sharper than at any point in the scheme's history. A claim submitted without a proper technical narrative, qualifying-expenditure analysis and the mandatory supporting documentation will very likely trigger an enquiry. This is the one area where a specialist hand on the claim is essential rather than optional.
VAT in third-party logistics is genuinely complex, because you're handling goods that don't belong to you, often for clients who aren't based in the UK either. Several regimes interact:
Each of these is manageable on its own, but they interact in ways that catch out even sophisticated operators. Getting VAT right in 3PL is less about memorising the rules and more about having the operational discipline to flag the right transactions to the right treatment — which is exactly the kind of process a specialist helps you build.
3PL workforces are rarely simple: permanent operatives, temporary agency staff at peak, drivers on different contracts for multi-drop, trunking or final-mile work, and salaried managers across multiple sites. Running it well means more than accurate PAYE. It means handling holiday-pay calculations correctly under post-Harpur Trust rules, managing pension auto-enrolment across a high-turnover workforce, treating benefits in kind properly (fuel cards and company vehicles in particular), getting agency-worker treatment right, and staying ahead of National Living Wage increases each April. For a multi-site London 3PL with several hundred operatives across permanent and temporary staff, payroll is a significant operational function, not a back-office afterthought.
Do I need a specialist 3PL accountant, or will a general accountant do? A general accountant can keep you compliant, but the reliefs that matter most to a 3PL — capital allowances on fit-outs, full expensing on fleet and plant, and R&D relief on technology — are precisely the areas they tend to under-claim. Sector knowledge usually pays for itself on the first claim.
Can I claim capital allowances on a warehouse fit-out I completed a few years ago? Often, yes. Retrospective claims on historic fit-outs are one of the most common ways a sector-aware accountant recovers significant relief that was previously missed.
Is full expensing available to my business? Full expensing — the uncapped 100% first-year deduction on new main-rate plant and machinery — is available only to limited companies. Sole traders and partnerships rely on the AIA and the newer 40% first-year allowance instead, which is one reason scaling operators review their structure.
Does my 3PL really qualify for R&D tax relief? If you're solving genuine technical problems — bespoke WMS work, system integrations, routing algorithms, automation — there's a strong chance part of that spend qualifies. The relief is generous, but the compliance bar is high, so the claim needs to be built properly.
We're growing fast — when should we bring in more than basic compliance? There's no fixed point, but the usual triggers are taking on new sites, investing in technology, renewing the fleet, or raising finance. A good finance partner will flag these moments with you rather than waiting to be asked.
We work with logistics and supply-chain businesses across the UK, and we understand the operational realities of running a 3PL in a way general-practice accountants rarely do, from year-end accounts and Corporation Tax through to capital allowances, R&D relief, VAT, complex payroll and the strategic planning that helps ambitious logistics businesses scale. For London operators in particular, we pair local knowledge of the ULEZ and operational environment with the technical expertise to make sure you're claiming everything you're entitled to. You can read more about our London team on our Accountants in London page.
If you'd like to talk through a fit-out claim, get a fresh pair of eyes on your fleet planning, or explore whether your technology investment qualifies for R&D relief, we'd love to hear from you.
Get in touch at pulse-accountants.co.uk, email help@pulse-accountants.co.uk, or call our London office on 0204 6500122 .
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