Capital One Fax Numbers
Capital One does not publish a general customer fax number — power of attorney goes through an online form and disputes go online or by mail. Here are the channels Capital One actually documents.
Last verified July 18, 2026 · Official domain: capitalone.com
Capital One does not publish a general customer fax number
Capital One does not publish a general customer-facing fax number for power of attorney or disputes on capitalone.com. Power of attorney requests are handled through an online form, and billing disputes are handled online or by mail. We do not repeat the fax numbers that aggregator sites attach to Capital One because we could not confirm them on Capital One's official site.
Official Capital One contact channels
Power of Attorney online request
capitalone.com/power-of-attorney — start the attorney/POA request online and Capital One reviews eligibility within about 7 business days.
Disputes in your account
Sign in and dispute a transaction from the transaction details, or from the Capital One Mobile app.
Billing dispute by mail
Capital One, Attn: Disputes, P.O. Box 30279, Salt Lake City, UT 84130-0279
General customer service
1-877-383-4802
Capital One directs POA and other requests to this line for routing.
What to include when you fax Capital One
- Your Capital One account number and the name on the account
- For a POA: the power of attorney document and any Capital One attorney/agent form requested through the online flow
- For a dispute: the transaction date, amount, merchant, and why you are disputing it
- A daytime phone number and current mailing address
- Copies only — never mail or upload original legal documents
How to fax Capital One
If you searched for a "Capital One fax number," the honest answer is that Capital One does not publish a general customer-facing fax line the way some banks do. Its power of attorney process is built around an online request at capitalone.com/power-of-attorney, where you start the attorney/agent request and Capital One determines eligibility — usually within about seven business days — then follows up by mail. There is no public POA fax number on Capital One's site.
Billing and transaction disputes are similar: the fastest route is to dispute the charge directly inside your Capital One account online or in the mobile app. If you prefer a paper trail, Capital One publishes a mailing address — Capital One, Attn: Disputes, P.O. Box 30279, Salt Lake City, UT 84130-0279 — rather than a customer dispute fax. For anything you are unsure how to route, Capital One's general line at 1-877-383-4802 will point you to the correct department.
Because Capital One does not advertise a customer fax, be skeptical of "Capital One fax number" listings on directory sites — we could not confirm any of them on capitalone.com, so we do not repeat them here. If a Capital One representative gives you a specific department fax for your particular case, use that number and confirm it with them before sending.
Capital One's preferred alternatives to fax
Capital One clearly prefers its online channels: the POA online request, in-account and in-app dispute filing, and secure document handling tied to your login. These are faster than paper and keep your documents inside Capital One's authenticated systems. Mail is the documented fallback for disputes; there is no customer fax to fall back on.
Faxing financial documents to Capital One safely
Power of attorney and dispute paperwork can expose account numbers and signatures. Because Capital One routes these online, prefer the authenticated online request or app whenever possible, and if a Capital One agent gives you a case-specific fax number, confirm it directly with the agent before transmitting anything sensitive.
Capital One fax FAQ
Does Capital One have a fax number for customers?
Capital One does not publish a general customer-facing fax number on capitalone.com. Power of attorney requests go through an online form, and disputes are filed online, in the app, or by mail. If a representative gives you a case-specific department fax, confirm it with them before sending.
How do I submit a power of attorney to Capital One?
Start the request online at capitalone.com/power-of-attorney. Capital One reviews eligibility — typically within about seven business days — and notifies you of the outcome by mail. Capital One does not list a public POA fax number.
How do I dispute a Capital One charge?
Sign in to your Capital One account online or in the mobile app and dispute the transaction from its details. If you prefer to write, mail Capital One, Attn: Disputes, P.O. Box 30279, Salt Lake City, UT 84130-0279.
Why can't I find a Capital One fax number online?
Because Capital One largely does not use customer fax for these requests. Directory and form sites sometimes list a Capital One fax number, but we could not confirm any of them on Capital One's official site, so we do not publish them. Use the online POA request, the in-app dispute tool, or the mailing address instead.
Who do I call at Capital One to route my request?
Capital One's general customer service line, 1-877-383-4802, can direct power-of-attorney and other requests to the right department. Have your account number and the relevant documents ready.
Other bank fax guides
XenFax is an independent online fax service and is not affiliated with, endorsed by, or acting on behalf of any bank named on this page. Bank names and logos are the property of their respective owners. Banks change department fax numbers periodically — always confirm the number against the official source linked on this page before sending sensitive financial documents.