Recovering costs from a client is straightforward in principle — you spent money on their behalf, they pay you back. In practice, the invoicing rules are more nuanced. Get it wrong and you could be paying VAT on amounts that should be exempt, missing reimbursements entirely, or creating accounting headaches for your client. This guide covers everything from the legal distinction between expense types to the exact line items to include on your invoice.
The key distinction: recharging expenses vs disbursements
Before you add expenses to an invoice, you need to understand which category they fall into. The distinction determines how VAT applies and how the transaction is recorded in your accounts.
Rechargeable expenses (the most common case)
A rechargeable expense is a cost you incur in delivering services for a client, which you then pass on as part of your fee. You buy the train ticket in your name, claim it back from the client, and the full amount — including VAT on the original purchase — flows through your turnover.
Examples: travel to a client site, hotel for an off-site meeting, software licences purchased for the project, printing costs.
VAT treatment: you add your own VAT on top of the recharged amount (if you are VAT-registered). So if you paid £120 including 20% VAT for a train ticket, you recharge £120 to the client and add 20% VAT on that £120. The client sees £144 on their invoice. You recover the input VAT on your own return, and collect output VAT from the client — the two cancel out for you, but the client pays your VAT on the recharge.
Disbursements (less common, specific rules)
A disbursement is a payment made strictly as an agent on behalf of the client. You are not buying for yourself and passing the cost on — you are acting as a transparent intermediary. The key tests: the supply is made to the client (not to you), the client knows you are paying on their behalf, and you recover the exact amount without any markup.
Examples: court filing fees paid on behalf of a legal client, a domain name registered in the client's name, a government certificate fee.
VAT treatment: genuine disbursements are outside the scope of VAT — you do not add VAT when recharging them. However, if any of the above tests fail, the expense becomes a rechargeable cost and VAT applies as above.
In practice, most expenses incurred by freelancers (transport, accommodation, meals, equipment) are rechargeable expenses, not disbursements. When in doubt, treat them as rechargeable and apply your VAT.
What to include on the invoice
A well-structured expense invoice clearly separates your fee from your costs, making it easy for the client's accounts payable team to process and for you to reconcile your records.
Option 1: separate line items on the main invoice
The simplest approach for small, predictable expenses is to list them alongside your services on a single invoice:
Professional services — 5 days consulting @ £500/day £2,500.00
Travel — return train London–Manchester (15/05/2026) £98.00
Hotel — 1 night Manchester (15–16 May 2026) £129.00
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Subtotal (excl. VAT) £2,727.00
VAT @ 20% £545.40
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TOTAL DUE £3,272.40
Add a brief description for each expense so the client can match it to their records and your receipts.
Option 2: summary line with expense report attached
For projects with many small expenses (mileage, meals, parking), it is cleaner to consolidate them into a single line on the invoice and attach a detailed expense report as a supporting document.
Consulting services — June 2026 £4,200.00
Expenses (see attached report ref. EXP-2026-06) £347.50
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Subtotal (excl. VAT) £4,547.50
VAT @ 20% £909.50
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TOTAL DUE £5,457.00
The expense report lists each item with date, amount, and category. You retain the original receipts.
Option 3: separate expense invoice
For larger projects or when the client requires it, issue a separate invoice purely for expenses. Use your normal invoice format — the same service invoice template works — but title it clearly (e.g., "Expense Invoice" or "Invoice for Reimbursable Costs"). This keeps the project's professional fees separate from its costs, which many finance teams prefer.
Evidence and receipts: what to keep
You must be able to substantiate every expense you recharge to a client. In most jurisdictions, this means retaining the original receipt or invoice for the underlying cost. Digital copies are generally acceptable, but check your country's requirements — some tax authorities still require original paper receipts for certain expense types.
Organise receipts by:
- Project or client — so you can produce all evidence for a specific invoice if challenged
- Date — matches the timeline on your expense report
- Category — useful for your own bookkeeping and for any client queries
Best practice is to photograph or scan receipts immediately after incurring the expense. Physical receipts fade and get lost; a photographed receipt stored in a folder labelled with the client name and project is infinitely more useful.
Mileage and car expenses
If you use your own vehicle for client travel, you typically cannot recharge the actual fuel cost — you recharge the mileage at an agreed rate. In the UK, HMRC's Approved Mileage Allowance Payments (AMAP) rates are:
| Vehicle | First 10,000 miles/year | Over 10,000 miles | |---|---|---| | Car or van | 45p per mile | 25p per mile | | Motorcycle | 24p per mile | 24p per mile | | Bicycle | 20p per mile | 20p per mile |
These rates cover fuel, wear and depreciation. If you recharge at these rates to a client, the amount is treated as a rechargeable expense and VAT applies if you are VAT-registered.
Keep a mileage log showing: date, start point, end point, purpose, and miles travelled. Without a log, mileage claims are very difficult to defend under audit.
Meals and subsistence
Meals are the most contentious expense category. General rules:
- Travel-related meals (away from your normal place of work for business purposes): generally allowable as a business expense and reimbursable from clients
- Client entertainment (dinner with a client, corporate hospitality): these are rarely allowable as business expenses in most jurisdictions, and clients are unlikely to reimburse them unless specifically agreed in the contract
- Working lunches at your desk: not an allowable expense
When invoicing for subsistence, keep the receipts, note the business purpose, and confirm with the client that meals are within the agreed reimbursable scope.
Agreeing expenses before you incur them
The single most effective way to avoid disputes over expense reimbursements is to agree the rules before the project starts.
Your contract or payment terms should specify:
- Which categories of expense are reimbursable (travel, accommodation, software, materials…)
- Any caps (e.g., maximum hotel rate per night, economy class only for flights)
- Whether markup is applied to expenses (some consultants charge 5–10% admin on recharged costs)
- Approval requirements for large expenses (e.g., anything over £500 requires prior client sign-off)
- Timeline for submitting expense reports (monthly, per project phase, at project end)
A clear upfront agreement prevents the uncomfortable conversation where you submit a £1,200 hotel bill and the client insists they expected a budget hotel.
VAT edge cases on expenses
Expenses incurred outside your country: if you travel abroad for a client and incur local VAT (e.g., a hotel in Germany with German VAT), you may be able to reclaim that foreign VAT via the EU VAT refund scheme (for EU-based businesses) or the relevant country's refund process. This is separate from what you charge your client — you recharge the net cost plus your own country's VAT.
Mixed-use expenses: if you take a taxi to a client meeting and then continue to a personal appointment, only the business portion is reimbursable. Either split the cost or absorb the personal element — do not recharge the full amount.
Subsistence away from home: extended projects requiring stays away from your usual base may qualify for different (and sometimes more generous) treatment under domestic tax rules. Consult your accountant if you are working away for extended periods.
Including expenses on your freelance invoice
When building expenses into your standard freelance invoice template, set up a consistent section at the bottom of the fee lines. Label it clearly ("Reimbursable expenses"), sub-total it separately, then apply VAT across the full amount (fees + expenses) if you are VAT-registered.
This layout makes it easy to see at a glance what your time costs versus what your costs cost, and it gives your client confidence that expenses are properly documented.
Common mistakes that delay reimbursement
No receipts: claiming expenses without evidence is the fastest way to get a payment query. Always attach or reference receipts.
Vague descriptions: "travel" means nothing to an accounts payable clerk. "Return train — London Paddington to Bristol Temple Meads — 03/06/2026" gets paid faster.
Mixing personal and business expenses: keep a separate card or account for business expenses if possible. Mixed expenses create reconciliation problems.
Invoicing expenses in a different currency without a conversion: if you incurred expenses in USD and are invoicing in GBP, show the original amount, the conversion rate used, and the GBP equivalent.
Forgetting expenses entirely: for long projects, it is easy to lose track of small expenses. Logging them in real time — even in a simple spreadsheet — prevents this.
Summary
Billing for expenses does not have to be complicated. Distinguish between rechargeable expenses and true disbursements, apply the correct VAT treatment, provide clear descriptions and evidence, and agree the rules with the client before you start. Done properly, expense reimbursement adds to your cash flow, not your admin burden.