Expense reports and supporting documents for micro-entrepreneurs: the complete guide to tax compliance

The micro-entrepreneur status has a reputation for simplicity. No balance sheet, no complex tax return, a turnover declaration in a few clicks. This simplicity, however, hides a fundamental requirement: every euro declared, and every expense incurred, must be provable. Supporting documents are not an administrative detail. They are proof that your activity genuinely exists, that it generates the announced turnover, and that it operates according to the rules.

The micro-entrepreneur benefits from simplified accounting, but not from an absence of accounting. Two registers remain mandatory. The first is the revenue ledger: a chronological document listing each receipt, its origin, its amount, and its payment method. The second concerns merchandise sales or accommodation activities: a purchase ledger, which tracks expenses related to these resold purchases.

These obligations are reminded by Urssaf for the social part, and by the tax administration for the declarative part. The principle is simple. You do not have to submit your supporting documents at the time of declaration. But you must be able to produce them at any time, upon request. This is called the administration's right of communication: it can demand your documents without particular notice, as part of an audit.

A micro-entrepreneur's social contributions are calculated on the declared turnover, not on the actual profit. This is a key difference from a traditional company. This means that your expense receipts do not mechanically reduce your contributions. Their role is elsewhere: they prove that the turnover you declare corresponds to a real activity, neither inflated nor understated.

Regarding income tax, the micro-tax regime applies a flat-rate allowance to the turnover. This mechanism replaces the itemized deduction of expenses. But supporting documents remain essential in several cases: if you are subject to VAT, if you plan to switch to the actual regime one day, or simply to prove the consistency of your activity in case of verification. A turnover without any trace of professional expenses always ends up attracting attention.

The basic rule is simple to remember: every professional expense must have its proof. But the nature of this proof varies depending on the amount, the type of purchase, and your sector of activity.

An expense report supporting document is a dated and detailed document that proves an expense was incurred as part of your professional activity. To be valid, it must include several specific details:

• the date of the transaction,
• the name and address of the seller or service provider,
• the exact nature of the good or service purchased,
• the amount paid, ideally detailed as pre-tax and all taxes included,
• the payment method used.

A simple bank card receipt, without purchase details, is not always sufficient. Always prefer the invoice or detailed receipt over just the bank statement, which only shows an amount without proof of its purpose.

Depending on your profession, some documents carry more weight than others. Here are the priorities by major activity family.

For a significant purchase, the invoice alone is not always enough to trace the operation. Also keep the signed quote, which validated the amount and conditions before the purchase. Keep the purchase order, if one exists. If payment was made in installments, keep the deposit invoice and the balance invoice. For financing, leasing, or long-term rental of equipment or a vehicle, the complete contract must remain accessible. These documents allow for the reconstruction of the complete history of an investment, not just its final amount.

A classified supporting document is only valuable if it remains accessible on the day it is requested. The retention period is therefore not a detail: it determines your ability to respond to an audit, sometimes several years after the expense.

The general rule sets the retention of supporting documents and accounting records at 10 years from the closing of the financial year, under article L.123-22 of the Commercial Code. This obligation also applies to micro-enterprises.

Certain documents deserve longer retention, even beyond this minimum obligation. A commercial or professional lease must be kept for its entire duration, then a few years after its end. Documents related to a dispute with a client or supplier must be kept until the complete resolution of the dispute. In case of doubt about a document, it is better to keep it too long than not long enough.

Paper no longer has a monopoly on proof. A digital supporting document has the same legal value as an original paper document, provided certain guarantees are met: lasting legibility, no possibility of modification after recording, and traceability of its origin. A blurry scan or an easily modifiable file loses its probative force in case of dispute.

The PDF format remains the reference for archiving, as it freezes the content of the document. This topic takes on particular importance with the progressive generalization of electronic invoicing, driven by the Factur-X reform by 2027. This structured format combines a readable image and automatically exploitable data, which facilitates both archiving and controls. Anticipating this evolution today avoids an urgent switch. Discover our article on Factur-X explained simply to understand how it concerns your invoicing.

The best classification method is not the most sophisticated. It's the one you actually apply, every week, without memory effort.

Three classification logics work well for a self-employed person. Classification by month suits an activity with a regular flow of expenses. Classification by type of expense, such as supplies, travel, or communication, helps identify your cost centers. Classification by project or by client is suitable if you bill by project and need to isolate expenses incurred for each. The important thing is not to choose the perfect method. It's to keep the same one all year, to avoid gaps in tracking.

The best time to scan a supporting document is immediately, at the time of the expense. A ticket photographed on the sidewalk is much more likely to survive than a ticket slipped into a pocket. Name your files consistently, with the date and supplier name, to find them in seconds.

Then store these files in a secure space, with a separate backup copy. A single hard drive, without a copy, remains a point of fragility in case of failure or loss. For now, Quickote does not yet manage expense reports, but its voice dictation already allows you to create a quote or invoice in a few seconds. Discover our article on voice dictation for artisans to save time daily.

Each declared turnover line must be linkable to an identifiable invoice or receipt. Before submitting a declaration, get into the habit of quickly checking this correspondence. A discrepancy between the declared amount and the available documents is often the element that triggers additional questions in case of an audit. A management tool that automatically links quotes, invoices, and receipts simplifies this verification, instead of postponing it until the end of the year.

This is where most confusion lies among micro-entrepreneurs. The answer depends on your tax regime and the exact nature of the expense.

An expense is recognized as professional only if it meets three cumulative conditions. It must be incurred in the direct interest of your activity. It must correspond to a real amount, justified by a probative document. It must not be personal in nature, even partially, without a clear distinction between professional and private use.

Under the micro-tax regime, most micro-entrepreneurs apply a flat-rate allowance to their turnover, which replaces the detailed deduction of each expense. This does not exempt them from keeping supporting documents: they remain essential for VAT when applicable, and for any future evolution towards another regime. To learn all about this topic, consult our complete guide to VAT in micro-enterprises.

Here are the categories of expenses most often recognized as professional, provided they are justified:

• supplies and small equipment related to the activity,
• share of rent and charges for premises used for work,
• electricity, water, and heating, pro rata to professional use,
• professional insurance, such as civil liability or ten-year guarantee,
• transport costs related to the activity, including fuel pro rata,
• professional phone and internet subscriptions,
• training directly related to the profession exercised,
• postage and shipping costs,
• business software and subscriptions,
• bank fees related to the professional account.

Conversely, certain expenses are never recognized as professional, regardless of the regime. Strictly personal expenses, unrelated to the activity, are among them. Personal social contributions are also not deductible, as they are already calculated on a flat-rate basis on turnover. Equipment depreciation does not exist under the micro-regime, unlike a company that spreads the value of an asset over several years. Finally, sumptuous expenses, disproportionate to the actual activity, are systematically rejected by the administration.

Certain expenses regularly create misunderstandings. Meals are only justified in an exceptional professional travel context, not for your daily meals. A personal vehicle used for the activity requires a clear distinction between professional and private trips, with precise tracking. Client gifts must remain reasonable, with a supporting document mentioning the recipient and the context. So-called representation expenses always require a demonstrable professional link, not a simple assertion. As for training, it must correspond to your actual activity, and not to a retraining project unrelated to your current status.

An audit doesn't happen every day. But when it does, the absence of supporting documents turns a simple verification into a source of reassessment.

The audit generally begins with an official request, which specifies the expected documents and the deadline for response. The administration can conduct a desk audit, remotely, or a more in-depth examination of your accounting. You must then submit the requested supporting documents within the indicated deadline, in a legible and complete form. Urssaf can, for its part, conduct a separate audit concerning the accuracy of the declared turnover and the calculation of contributions.

An expense without supporting documents can be reincorporated into your taxable income, as if it had never existed fiscally. This reincorporation is accompanied by late interest on the reassessed amounts. In case of deliberate non-compliance, a 40% surcharge may apply to the recalled rights. This rate climbs to 80% in case of fraudulent maneuvers or undeclared activity, i.e., an activity not declared at all. These surcharges are added to the amounts due; they do not replace them.

Not all is lost in case of a good faith error. The right to error allows for spontaneous regularization of a situation, often without penalty, if the action occurs before any audit and without intent to defraud. In case of disagreement with the conclusions of an audit, several remedies exist: hierarchical appeal to a supervisor of the auditor, referral to a departmental contact, or recourse to mediation. Before reaching that point, always respond within the allotted time, with available documents, even partial ones. For a complex case, the support of a chartered accountant remains the best reflex to secure your defense.

Today, Quickote centralizes your quotes and invoices in a single flow, with voice dictation that saves precious time on site. Dedicated expense report management is not yet available, but it is part of the roadmap. In the meantime, the methods in this guide help you keep your supporting documents in order and stay ready in case of an audit.

• Voice dictation for quotes and invoices: you describe a client or a service aloud, the application creates a structured document.
• Quotes and invoices in one place: a single history to track your outstanding amounts and payments, without juggling multiple tools.
• Clear cash flow view: your commercial documents are accessible at any time for quick monitoring of your activity.

Want to see how it works in practice? Test our management features on the Pricing page or discover our article on choosing a quote software for artisans.