​Lost Your EIN? What the IRS’s Tax Pro Account Update Actually Changes

Every business owner who has been operating for more than a few years has, at some point, needed their Employer Identification Number (EIN) for a new bank account, a loan application, or an investor request. Unfortunately, the majority discover that the confirmation letter they got with that employer id number when their business was formed is nowhere to be found.

Until recently, fixing that meant one thing: getting on the phone with the IRS yourself, sitting on hold, and hoping the agent could verify you as an authorized person before issuing a replacement. A February 2026 update to the IRS's digital infrastructure is starting to change that calculus, though not in the way some early coverage has suggested. Here's what actually happened, and what it means for you.

The baseline problem, unchanged

First, the parts that are still true regardless of any IRS technology update: your EIN number never expires and is never truly lost. It's a permanent identifier tied to your business. But the IRS does not let you look it up online. There is no public EIN lookup tool associated with your IRS account. If you can't find it in your own records, you have two paths: dig through your own paperwork, or contact the IRS directly.

Before calling anyone, check these sources first, in order of likelihood:

• Prior tax returns. For corporations, it's in Box B on the first page of Form 1120. For partnerships, Box D on Form 1065. For sole proprietors, Box D on Schedule C.
• Your original CP 575 letter — the confirmation notice the IRS mailed when your EIN was first assigned, if you applied online, you may also have a downloadable copy from that session.
• Business bank account documents, loan paperwork, or state licensing and registration filings, all of which typically list your EIN.
• Your accountant's files. Most tax preparers keep client EINs on record permanently.

If none of that turns anything up, you'll need to call the IRS Business & Specialty Tax Line at 1-800-829-4933 (Monday–Friday, 7 a.m.–7 p.m. local time) and request Letter 147C, EIN Previously Assigned — the IRS's standard replacement document. It's free, can be requested as many times as needed, and carries the same legal weight as the original CP 575 letter.

The catch here has always been the process: verification questions, hold times that can run 15–45 minutes during peak season, and delivery limited to fax or mail . The IRS does not email these documents for identity-security reasons, according to the IRS's own guidance and multiple firms that handle this process professionally.

What actually changed in February 2026

On February 9, 2026, the IRS announced an expansion of its Tax Pro Account platform (IR-2026-22) . This is a free digital portal, launched in 2021, that lets authorized tax professionals manage client authorizations online instead of relying on paper Forms 2848 (Power of Attorney) and 8821 (Tax Information Authorization).

The update specifically targets tax-professional businesses, accounting firms, tax-preparation companies, and similar organizations that operate under a shared business Centralized Authorization File (CAF) number, as opposed to individual sole practitioners. According to the IRS, designated business representatives at these firms can now:

• Manage the firm's business CAF access, including which employees are authorized to act under it
• Link the business CAF number directly to the company's EIN through the Tax Pro Account
• View taxpayer information associated with the business CAF within the scope of active authorizations
• View and withdraw active authorizations on behalf of the firm digitally, rather than through mailed or faxed forms

IRS CEO Frank Bisignano described the update as a "taxpayer favorable change" that will improve how tax-professional businesses serve their clients. Sole proprietorships and businesses that don't use CAF systems are explicitly unaffected . This is a change for firms with an established business-level authorization infrastructure, not an overhaul of how any individual business owner interacts with the IRS directly.

What this means in practice — and what it doesn't

To be precise about what this unlocks: it does not create a new way for a business owner to look up their own EIN online, and it does not bypass the IRS's identity-verification requirements. The underlying rule that the IRS will only release EIN-related information to an authorized person hasn't changed.

What it does change is the experience for businesses that already work with a CPA, enrolled agent, or tax attorney who has power of attorney or a tax information authorization on file. Previously, even an authorized tax professional had to navigate largely paper-based, fax-dependent workflows to act on a client's behalf for anything touching the business's CAF relationship. Now, a firm's designated representative can manage that relationship — including the EIN linkage — through a digital portal in something closer to real time, cutting out a meaningful amount of the back-and-forth that used to define this process.

For a business owner who's been putting off a bank's request for EIN verification because the idea of navigating the IRS phone tree themselves is exhausting, this is a legitimate reason to have a five-minute conversation with your accountant instead. If your CPA's firm operates under a business CAF, which most established accounting and tax-preparation firms handling any real volume of clients do, they may now be able to resolve what used to be a multi-week paperwork problem considerably faster.

The practical takeaway

If you've lost track of your EIN documentation:

1. Check your own records first: tax returns, bank documents, state filings. This resolves the majority of cases without any IRS contact at all.
2. If you strike out, ask your tax professional whether their firm has a linked business CAF. If so, they may be able to help you resolve EIN verification issues digitally rather than you calling the IRS yourself.
3. If you don't have an ongoing relationship with a tax professional, or your preparer's firm doesn't use a business CAF, the traditional path , call 1-800-829-4933 and request a 147C letter. This option remains available and free.
4. Going forward, once you locate or receive your EIN documentation, keep a digital copy alongside your other foundational business documents (articles of organization, operating agreement) so this doesn't become a recurring problem. You can maintain this documentation for free on a secure, SOC 2 compliant system like Loan Mantra.