Who actually needs a permanent fax number?

Anyone who prints a fax number on forms, letterhead, listings, or vendor profiles and cannot control when the other party dials. Occasional senders do not need one.

Should I keep the EIN return fax as my business number?

No. EIN by Fax includes a 90-day IRS return channel. After the confirmation lands, publish a lifetime number if banks and vendors will keep asking — do not treat the 90-day line as letterhead.

Is a permanent number the same as a HIPAA inbox?

No. A lifetime number is an admin address. Protected health information needs HIPAA Secure Mode and a BAA on a company plan, not a lifetime claim.

Do Canadian businesses need a lifetime number for CRA?

CRA usually delivers protected correspondence through My Business Account or mail, not fax. A Canadian lifetime number still helps with banks, counsel, and US counterparties that ask for fax on forms.

Who Needs a Permanent Fax Number in 2026 (and Who Should Skip It)

A permanent fax number is not a personality trait and it is not a page bundle. It is a published address: you put it on a form once, and someone you do not control dials it weeks or months later.

If that sentence does not describe you, skip lifetime. Send from $0.99 or take a 30-day number for $4.99. The full price math is in Lifetime vs 30-day vs subscription. This post is the “who” — founders after EIN, real estate, clinics, and the people who should not be sold a forever line.

After the EIN: solo LLC founders

The EIN by Fax product is $19.99: Form SS-4 fill, Fax-TIN, and a 90-day return number so the IRS can send the confirmation cover sheet (typically about four business days). That job ends.

What does not end: Mercury, Stripe, a payroll vendor, a 1099 contractor, and the first bank still asking for a fax field on a W-9 or vendor form. Those arrive on their onboarding queue.

Keep the lifetime number if the fax is going on your operating-agreement packet, invoice footer, or “company fax” field. $97 once (Pro $147). Send stays $0.99. Extra inbound after starter credit is $4.99. Credit does not expire.

Do not treat the 90-day EIN line as letterhead. It is a per-job IRS reply channel. Formation math:

Situation	Product
Client needs an EIN this week	EIN by Fax $19.99
Your own firm needs a published fax	Lifetime $97
Daily staff queue	Companies from $9.99/mo

Real estate, title, escrow, mortgage

Closings slip. Conditions come back after the buyer’s 30-day rental is dead. That is the late-reply story in one sentence.

A listing, broker packet, or title instruction sheet that shows a fax number is a publish decision. The lender or insurer works a file when the file is ready — not when your temporary line expires.

Use 30-day only when you know the other desk will return pages this cycle (a same-week payoff request, a known underwriter). Use lifetime when the number is printed where a stranger will find it in month four.

Inbound on lifetime is still $4.99 after credit, with hold-to-release if the balance is empty. You are buying the address, not unlimited title packages.

Clinic, dental, and pharmacy admin

Referrals and prior-authorizations still move by fax. They also arrive late: a specialist office dials the number on last month’s cover.

A lifetime number is a reasonable admin inbox for that. It is not a HIPAA claim. SingleFax lifetime does not include a BAA. If you handle PHI, use HIPAA Secure Mode on a company plan.

Soft rule: publish lifetime for routing and vendor forms; put PHI on the Secure path.

Accountants, bookkeepers, tax prep

Engagement letters and organizer packets sit in a drawer until March. A client’s prior CPA or a payroll bureau may fax you in August.

If you only send returns and elections, stay on pay-per-fax. If clients and counterparties need a number that still rings next season, lifetime is the published line. Heavy January–April volume with several staff is a subscription problem.

IRS honesty (same as the comparison post): Fax-TIN will fax an EIN packet back if you gave a return number. Most other IRS traffic is outbound from you, or Document Upload — not a surprise inbound firehose.

Law firms and courts

Letterhead still has a fax field. Some clerks, boards, and insurers have not moved. A permanent number keeps that field honest.

Daily exhibit volume and shared intake belong on for-companies. Lifetime is the stable address on the stationery, not a substitute for a multi-user queue. See also faxing for legal documents.

Canada inbound (without the CRA myth)

A Canadian lifetime number is still a strong fit when banks, counsel, or US partners put a fax field on onboarding packs.

CRA usually delivers protected correspondence through My Business Account or mail — not as unsolicited fax to your number. Lifetime here is identity for counterparties and forms that still ask, not a CRA inbound pipe.

Formation and EIN helpers (Fiverr and similar)

This is the ICP that gets sold the wrong SKU.

Per-client SS-4 work needs a 90-day return channel, not a $97 line you never reuse. That is EIN by Fax at $19.99. Lifetime is only if your formation shop wants a permanent firm fax on your site.

Do not pitch lifetime as the EIN-mill product.

Occasional / personal (most people)

Tax season, one insurance form, a landlord packet. If the form does not require your fax, send for $0.99. If they must fax you back this month, $4.99 for 30 days. Lifetime is for the minority who will keep printing the same number.

Quick chooser

Send only → $0.99
Known reply window → $4.99 / 30 days
Publish / unknown timing → $97 lifetime
Daily volume / seats → $9.99/mo
Client EIN → $19.99, 90 days

Hold-to-release applies on lifetime: empty credit does not drop the pages; we email sender and page count and release after top-up. 30-day money-back: refund policy.

Claim the number on the lifetime fax number page, or start from lifetime numbers 101 if you still want the mechanics.