Faxing the French Treasury: Disputing a Public-Sector Bill

Short answer: a trésorerie (treasury office) — renamed in most départements service de gestion comptable (SGC), or public accounting service — is the DGFiP department that collects debts owed to local authorities and public institutions: school canteen, after-school care, nursery, water and sanitation charges, hospital stays, post-parking fees, rent on municipal housing. When you receive a notice of sums due (avis des sommes à payer) or a formal demand for payment, two procedures are distinct and are not addressed to the same person: disputing the merits of the amount (the authorising officer — town hall, hospital, water board — is the one who issued the bill) and disputing the collection or requesting time to pay (that falls to the public accountant, i.e. the treasury office or the SGC). Many SGCs still have a fax line, and faxing them makes it possible to lock in the date when the deadline is only a few days away. But fax does not replace registered mail: send the same file by recorded delivery with acknowledgement of receipt the very same day and keep the transmission report.

Trésorerie, SGC, SIP: knowing who you are writing to

Confusion costs weeks. Three distinct networks coexist within the Direction générale des finances publiques, and a fax sent to the wrong department will not be redirected in time.

In other words: if you believe the bill is wrong (your children did not eat at the canteen on those days, the water reading is absurd, the hospital stay was covered by the CPAM), you must write to the authorising officer — but also inform the public accountant, so that enforcement proceedings are suspended. If you acknowledge the amount but cannot pay it in one go, it is the SGC and the SGC alone.

For taxes proper, the procedure and the deadlines are different: we cover them in our article on claims and formal demands addressed to the tax authorities.

The deadlines you must not miss

The notice of sums due is an enforceable title. It carries enforcement power in itself, without going before a judge. The deadlines are short and are set out on the reverse side, in small print that few people read.

• Two months from notification of the notice to lodge an opposition à exécution (you dispute the existence or the amount of the debt) or an opposition à poursuites (you dispute the lawfulness of the enforcement measure), in accordance with article L. 1617-5 of the Code général des collectivités territoriales. This claim is addressed to the public accountant, and it is a mandatory preliminary step: going straight to a judge without having gone through them causes the appeal to fail.
• Two months likewise for a court action before the administrative court or the civil court, depending on the nature of the debt, running from the accountant's reply — or from their silence for two months, which counts as a rejection.
• Two months after notification of an administrative garnishment order (SATD) to challenge it, and in practical terms fifteen days before the funds are actually taken from the bank account.
• Four years for the assessment limitation period and the limitation period for collection action, also four years from the date the title was taken into charge: a notice dug up six years later can be challenged on that ground.

It is precisely within these two-month windows that fax regains its usefulness. A formal demand received on the 14th of a month, a business trip, a post office closed on Saturday afternoon: a fax sent at 5.40 p.m. on the final day produces a time-stamped transmission report, whereas a letter posted that same evening will bear the next day's postmark.

What is worth faxing to an SGC

Four letters cover most of what an individual or a small organisation sends to a public accountant.

1. Requesting time to pay or an instalment plan

You acknowledge the debt. You are asking for an instalment schedule. The letter must be short, specific in figures and signed:

• full identification: name, address, notice reference (title number, financial year, subject), amount;
• the proposal: number of monthly instalments, amount of each, date of the first payment;
• evidence of your situation: tax assessment, Pôle emploi/France Travail certificate, sick-leave certificate, a simple table of outgoings;
• an express request for suspension of enforcement proceedings while the case is being examined.

A public accountant very often grants a schedule of three to twelve months when approached before an enforcement measure is taken. After an SATD, it is much harder.

2. Disputing the merits, with a copy to the accountant

Addressed to the authorising officer (the mayor, the hospital director, the chair of the water board), with a copy faxed to the SGC the same day so that the file is flagged as disputed. Attach everything that proves the error: a school certificate of attendance days, a counter-reading of the meter, a certificate from your top-up health insurer, the CPAM statement.

3. Requesting a discretionary write-off

This does not argue about the debt: it asks for it to be written off in whole or in part on grounds of financial hardship. It targets surcharges, enforcement costs, sometimes the principal for hospital debts. It does not interrupt any appeal deadline — never use it in place of an opposition à exécution.

4. Challenging an administrative garnishment order

This is urgent by nature: the bank freezes the funds and charges fees. Fax makes full sense here, backed up by a phone call to confirm receipt.

Finding the right number — and checking it before you send

This is the weak point of any fax procedure aimed at the DGFiP. The local network reform has merged hundreds of treasury offices into public accounting services since 2019, with new addresses, new numbers, and analogue lines unplugged during the switch to voice over IP.

Three rules to avoid faxing into the void:

1. Start from the document you received. The notice of sums due carries in its header the exact name of the assigned department, its address, its phone number and, where one exists, its fax line. It is the most reliable source there is.
2. Cross-check against an official source. The impots.gouv.fr website and its directory of services, or the service-public.fr portal, let you confirm that the department exists and check its contact details. For a hospital or a municipality, use the institution's official website.
3. Check the format and call. Ten digits, no international dialling code, no extension. A ten-second voice call to the switchboard to have the fax number confirmed is worth more than a transmission lost in transit. Our full method is set out in the article devoted to checking French administrative fax numbers, and the directory of official numbers lets you look up departments already listed.

If the SGC no longer has a fax — an increasingly common case — switch to the secure messaging service in your personal account on impots.gouv.fr, which also time-stamps the submission, and back it up with registered mail.

Building a faxable file that gets through first time

A twelve-page fax sent askew, with a faint stamp and an illegible title number, ends up filed with no action. A few habits are enough.

Assemble the file before sending. Cover sheet, signed letter, then the supporting documents in the order announced. Our fax cover sheet generator produces a legible header showing the number of pages, and the PDF file assembler lets you merge the documents in the right order before transmission.

Scan cleanly. A document scanner with an automatic feeder solves in a single pass the problem of ten- to twenty-page files, whereas smartphone photos produce contrasts that do not survive fax compression. Failing that, a smartphone stand with a light avoids the cast shadows that drown the figures on a meter reading.

Sign in bold ink. The signature must remain visible after faxing: a black ballpoint pen comes through better than a pale blue felt tip or a gel pen that smudges.

Number the pages by hand in the bottom right-hand corner, in the form "3/9". The accountant will know immediately if a page is missing, and you will be able to resend just that one.

Date and keep everything. The transmission report is the only proof of your diligence. File it together with a copy of the dossier in an elasticated folder per case, or as a PDF in a folder named after the title reference. A small portable external hard drive backs up the whole set without depending on a single computer. On retention periods, see our article on archiving transmission receipts.

The mistakes that cost the most

Silence from the public accountant for two months counts as a rejection. Failing to follow up means letting the litigation deadline run out for nothing.

• Paying first, disputing later. Payment does not extinguish the right to a refund, but it considerably weakens an opposition à exécution: in practice you have acknowledged the debt.
• Calling instead of writing. A phone call leaves no trace. Even when the officer is helpful, put it in writing.
• Disputing with the wrong department. An opposition à exécution addressed to the town hall rather than the accountant may be ruled inadmissible. Always copy in both.
• Forgetting the title reference. Without a title number and a financial year, an SGC handling tens of thousands of claims will not find your file.
• Confusing a discretionary write-off with a dispute. The former interrupts nothing. If the deadline is close, lodge the opposition first, then request the write-off in a second letter.
• Waiting for the SATD. Once the garnishment has been notified to the bank, the fees are payable and time is working against you.

Real-world cases

School canteen: days billed in error

Three meals billed during a week of justified absence. A certificate of absence issued by the school or a note from the head teacher is enough. The letter goes to the municipality's education department, with a copy faxed to the SGC marked "file disputed, suspension of enforcement requested". A simple table calculating the difference, meal by meal, speeds up processing.

An abnormal water bill

A leak downstream of the meter may give rise to a capping of the bill under article L. 2224-12-4 of the CGCT, on production of a plumber's repair certificate within one month of informing the service provider. Attach the repair invoice and the meter reading taken after the repair. A meter-reading notebook kept monthly makes the case crystal clear.

Hospital stay: the daily charge that comes round twice

Check the CPAM statement and your top-up insurer's cover first. Very often the bill is correct but the complementary share has never been forwarded. In that case the right contact is the institution's admissions office, not the SGC. Our pointers on these exchanges can be found in the article devoted to documents faxed to hospitals.

Frequently asked questions

Does a treasury office really accept a fax in 2026?

It depends on the department. SGCs housed in recent premises have often kept a fax line for exchanges with revenue officers, notaries and healthcare institutions. Others have scrapped it. Check the notice you received and call before sending, and always plan a registered letter in parallel.

Does the transmission report prove my dispute was received within the two months?

It proves that a transmission took place to a given number, at a given time, with a given number of pages. It is prima facie evidence that the courts weigh at their discretion. It is all the stronger when accompanied by a full copy of the faxed file and a registered letter sent the same day. We explore this question in our analysis of the evidential value of fax.

Does a dispute suspend payment?

An opposition à exécution suspends enforced collection in principle, unlike an opposition à poursuites, which only suspends the measure being challenged. Request it expressly and in writing: suspension is not automatic in administrative practice.

Can I fax from a computer without a fax machine?

Yes. An online fax service sends a PDF to a French number and returns a transmission receipt. If you go through your broadband router's landline, the options vary by operator: see what Free, Orange, SFR and Bouygues still offer. With no equipment at all, the service points listed in our guide to places where you can send a fax remain a fallback solution.

What should I do if the SGC never replies?

After two months, silence counts as a decision to reject: the window for court action opens. Follow up in writing, enclosing a copy of your first submission and the transmission report, then refer the matter to the departmental tax conciliator (conciliateur fiscal départemental), and failing that to the Défenseur des droits. Keep a record of every step.

In summary

• The trésorerie or SGC collects; the authorising officer (town hall, hospital, water board) issues the bill. Disputing the amount and disputing the collection do not go to the same department.
• The key deadline is two months from notification of the notice of sums due, for an opposition à exécution or an opposition à poursuites addressed to the public accountant — a mandatory preliminary claim.
• Fax is there to win the date when the deadline is expiring. It replaces neither registered mail nor the secure messaging in your personal account.
• Check the fax number on the notice you received, cross-check it against an official source, and confirm it by phone: the local network reform has removed a great many lines.
• A faxable file comes down to a legible cover sheet, a signed letter with the title reference, and hand-numbered documents.
• Keep the transmission report and a full copy of the file: it is the only proof of your diligence if the dispute goes before a judge.