LetterAgent
Mail physical letters by just asking your AI assistant.
Home > Guides > IRS payment plan fax
Yes, in many cases. The IRS accepts faxed installment agreement requests for certain taxpayers and situations, but the right fax number depends on your case, and the online payment agreement tool is faster when you qualify. Use the number on the notice the IRS sent you, or the number your assigned revenue officer gave you.
This is general information, not tax advice.
An installment agreement is the IRS's name for a monthly payment plan for back taxes. The request itself is usually made on Form 9465, the Installment Agreement Request, sometimes with a Collection Information Statement (Form 433-A or 433-F) attached when the IRS needs a picture of your income and expenses. Whether you can fax that packet, and where it goes, turns on how your case is being handled.
Fax fits three common situations. First, you are already working with a revenue officer or a specific IRS office, and that person gave you a fax number for your case. That is the clearest fax case: the number is tied to a person who expects your packet. Second, you are responding to a notice that itself lists a fax number for replies. Third, you are submitting a form the IRS instructions say may be faxed for your situation, such as certain business cases or cases where the online tool does not accept your balance or tax type.
Fax is not the default for everyone. Individual taxpayers who owe within the online tool's limits can usually set up a plan through the IRS Online Payment Agreement application, which gives an immediate answer instead of a fax that sits in a queue. If the online tool accepts your case, use it first. Fax earns its place when the online tool rejects you, when you need terms the tool cannot offer, or when a human at the IRS is already handling your case.
| Route | Best when | What you get |
|---|---|---|
| Online Payment Agreement tool | You qualify and your balance fits its limits | An immediate decision in most cases |
| Fax to an assigned officer or office | A person is already handling your case | Your packet lands with that person directly |
| No fax number was given and you cannot use the online tool | A paper trail, but slower processing |
Send the completed Form 9465, plus any financial statement the instructions or your notice call for, plus a cover page with your name, Social Security number or employer ID number, the tax periods involved, and a phone number where the IRS can reach you. Never guess at a fax number from a search result: IRS fax numbers are office-specific, they change, and a packet sent to the wrong office can sit unprocessed while interest and penalties keep running. The reliable sources are the notice in your hand, the revenue officer assigned to you, or the IRS phone line for your case type.
Keep the confirmation page and note the date you sent the packet. Then follow up. A faxed installment request does not stop collection action by itself until the IRS accepts the agreement, so if you receive further notices after faxing, call and ask whether the request was received and what its status is. Do not assume silence means approval.
The IRS reviews the request, checks whether the proposed monthly amount covers the debt within the allowed time, and may ask for more financial information or propose different terms. Until an agreement is accepted, keep making any payments you can and keep filing returns on time: a new unfiled return or a missed payment can derail an agreement before it starts. Once accepted, the agreement usually requires direct debit or payroll deduction for some taxpayers, and it stays in force only while you remain current on future tax obligations.
One caution that catches people out: an installment agreement does not stop interest and penalties from accruing on the unpaid balance. It stops most enforced collection, like levies, while you comply, but the balance still grows. That is why the IRS sometimes pushes for the largest monthly payment you can show you can afford, and why a financial statement matters for larger balances.
LetterAgent's fax service is currently available in testing for US and Canadian fax numbers, with no inbound faxes. You describe the fax to your AI assistant, approve the exact quoted total, and pay once through Stripe. Fax is still in testing and activation is in progress, so do not rely on it for a request sitting against a collection deadline.
Ready to fax it? Fax with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it is sent.
LetterAgent is a working name. Prices include print, postage, and our service fee. US prices in USD, Canadian prices in CAD (Canadian prices exclude applicable sales tax, added at checkout). Currently in private testing.
Need help? Ask your assistant: it can check a job's status any time. If it ever can't handle something: hello@getletteragent.com