Employee Expenses Forms UK: Employer Guide 2026
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Part ofUK Employment Law Guide for Employers (2025)
Running a business means dealing with a steady stream of small financial transactions between the company and its people. Staff travel to see clients, buy materials on their own cards, take prospects out for coffee, and occasionally front larger sums that need paying back quickly.
Without a proper system for recording and approving these amounts, things slip, tempers fray, and HMRC paperwork becomes a scramble at year end. This page walks through the forms and processes that UK employers commonly use to handle employee expenses and related salary paperwork.
It covers what each document is for, how they fit into onboarding, why accurate records matter for tax purposes, and where employers most often go wrong. If you are setting up expense procedures for the first time, or tidying up what you already have, the guidance below is a practical starting point.
What this document is
Employee expenses forms are the internal records a business uses to capture costs that staff pay out of pocket on the company's behalf. The most common is the expense claim form, which lists each item of spend, the date, the business reason, and any VAT where receipts are held.
Alongside this sit mileage logs for staff using their own vehicles, subsistence claims for meals while travelling, and authorisation sheets signed off by a line manager before payment is processed. Salary-related paperwork often sits in the same family: payslips confirming what has been paid, P60 and P45 forms produced through payroll, loan or salary advance request forms, and forms for changes to bank details.
Employers in the UK are expected to keep clear records of expenses paid to staff, because HMRC can ask to see them. A good expenses process protects the business, treats staff fairly, and makes year-end reporting on form P11D (where needed) far less painful.
How to use this document
- Decide what the company will reimburse. Before issuing any forms, write down what counts as a legitimate business expense. Think about travel, accommodation, client hospitality, phone use, home working costs and mileage rates. Set sensible limits so staff know what is reasonable and managers are not left making judgement calls on every submission.
- Introduce the process during induction. New starters should be shown the expenses system on day one, not weeks later when they have already paid for things. Cover which form to use, what counts as an allowable cost, whether receipts must be uploaded or posted, and how long reimbursement usually takes.
- Require evidence and a clear business reason. Every claim should be backed by a receipt or equivalent proof, along with a short note explaining the business purpose. This protects the employee, satisfies HMRC record-keeping expectations, and makes it easier for finance to reclaim VAT where the rules allow.
- Build in manager approval. A second pair of eyes on each claim catches errors, duplicates and the occasional overreach. Approval can be a signature on paper or a digital sign-off, but it should happen before payment is made, not after. Keep the approval trail with the claim.
- Reimburse promptly and keep records. Staff who have spent their own money expect to be paid back without chasing. Set a regular reimbursement date linked to payroll, tell people what to expect, and archive the forms and receipts for at least six years so they are available if HMRC asks questions.
Common questions
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Common questions
Q Do employers have to reimburse business expenses in the UK?
There is no blanket legal duty to reimburse every cost, but employment contracts, staff handbooks and custom often create an obligation. Certain costs, such as necessary travel for the job, are commonly repaid. If an employer refuses to refund genuine business spend, this can cause disputes and, in some cases, claims for unlawful deductions from wages. A clear written expenses policy prevents most problems.
Q What records does HMRC expect for employee expenses?
Employers are expected to keep records showing what was paid, to whom, when, and the business reason. Receipts, approved claim forms and payment records should generally be retained for at least six years. Some expenses also need reporting on form P11D or through a PAYE Settlement Agreement. The exact treatment depends on the type of expense, so check current HMRC guidance.
Q Are mileage payments taxable?
Mileage paid at or below HMRC's approved rates for business travel in an employee's own vehicle is generally tax-free and does not need reporting. Payments above the approved rate may be taxable and reportable. The approved rates are set by HMRC and can change, so confirm the current figures on gov.uk before setting your internal mileage rate.
Q Can an employer refuse an expense claim?
Yes, where the claim falls outside the expenses policy, lacks evidence, or was not for a genuine business purpose. To avoid disputes, the policy should set out clearly what is and is not reimbursable and how disagreements are handled. Blanket refusals of reasonable business costs can damage staff relations and, in some circumstances, breach the employment contract.
Q What is a P11D and when is it needed?
A P11D is an HMRC form used to report certain benefits and expenses provided to employees that have not been taxed through payroll. Common examples include company cars, private medical insurance, and some reimbursed costs. Not every expense needs P11D treatment, particularly where HMRC exemptions apply. Employers should check the latest rules on gov.uk or ask a payroll specialist.
Q Should small businesses use expense software or paper forms?
Either can work, but digital tools tend to save time once claim volumes grow. Software can capture receipt images, flag duplicates, apply mileage rates automatically and produce audit trails. Paper forms are fine for very small teams but become cumbersome quickly. Whatever system you use, make sure approvals are documented and records are stored securely for the retention period.
Q Can an employer make salary advances or staff loans?
Yes, many employers offer short-term advances or small loans, usually repaid through payroll deductions. A written agreement should set out the amount, repayment schedule and what happens if the employee leaves. Loans above certain thresholds can trigger tax implications as a benefit in kind, so check current HMRC rules before offering larger sums.
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Sources
This guide is based on primary UK law and official guidance.
- Guidance · UK GovHMRC: Expenses and benefits for employersgov.uk
- Guidance · UK GovHMRC: Travel, mileage and fuel allowancesgov.uk
- Guidance · UK GovHMRC: Form P11D guidancegov.uk
- Guidance · UK GovHMRC: Record keeping for businessesgov.uk
Legal helpline
Unsure how to set up your expenses process?
Getting expenses and payroll paperwork right matters for HMRC compliance and for keeping staff happy. An experienced legal adviser can help you think through your options based on what you describe on the call, from policy wording to what to do when claims go wrong.
- Plain-English answers to your specific questions about employee expenses
- Practical perspective on your specific situation as an employer
- Guidance tailored to what you describe about your current process
- A clearer sense of what to watch out for before you roll anything out
Legal disclaimer
This article is for general information only. It is a tool to help you find your way — not legal advice, and not a substitute for speaking to a qualified adviser about your situation.