The description on an invoice does not always explain what a purchase is for. The same product can serve very different purposes in different businesses. For an unusual expense, a specific, accurate description is the most useful starting point. You do not need to decide for yourself how it should be treated for accounting or tax purposes.
Explain what you bought and why
Start with two simple details: what the purchase actually covers and which business activity it is intended to support. Instead of a general phrase such as 'for business purposes', describe the task, project or problem it is meant to address. For software, explain its use; for training, the subject and its connection to your work; for equipment, where and how it will be used. Do not create a justification to fit the tax treatment you would like. Your accountants need the actual circumstances, even where the business purpose needs further discussion.
Say who will use the purchase and how
Explain whether the item or service is for the owner, an employee, a particular role or the whole business. If it is also used privately, say so clearly. For an item used away from your business premises, describe where and how it is used. Do not estimate the proportion to claim based on intuition. Information about its use is the starting point for identifying which rules and documents matter in your circumstances. This also applies to purchases made available to other people or given to customers.
Include documents that help explain the purchase
Depending on the purchase, a contract, order, service description, training programme or acceptance report may be helpful. There is no need to send every message if a document describing what was supplied and a short note are enough. Keep the original supporting records, however, in case questions arise later. Include the invoice number so the explanation can be clearly linked to it. If the description on the document is abbreviated or unclear, explain it separately rather than altering the seller's document yourself.
Describe the dates, funding and any changes
State when the purchase was ordered, received and paid for, and whether it covers a one-off service, a subscription or a longer period. Flag any advance payment, instalment purchase, reimbursement, grant funding or later return. Also mention if another person or organisation paid part of the expense. These circumstances may need explanations that are not apparent from the invoice alone. If the terms change after you have sent the documents, refer back to the earlier matter with its reference number and a description of what has changed.
Discuss major or unusual purchases before deciding
Before making a purchase whose tax treatment affects your budget, show your accountants the proposed terms. You can send the offer and list your questions: which documents to keep, what to clarify with the seller and whether a further consultation is needed. Having an invoice and explaining the business connection do not, on their own, establish whether an expense is deductible or VAT can be reclaimed. The assessment depends on the specific circumstances and applicable rules. An earlier conversation helps identify missing information before you commit to the purchase terms.
Bring with you
A short checklist to prepare
- What you bought and its actual business purpose
- Who uses it and how, including any private use
- The invoice number and documents explaining what the purchase covers
- Dates, funding arrangements and any returns or refunds
- Questions to discuss before committing to a major expense