Somewhere between finding a promising supplier and actually getting approved to sell their products, you will likely be asked to fax something. It might be a signed reseller agreement, a completed W-9, a copy of your resale certificate, or a credit application for a wholesale account. If you have never dealt with this kind of paperwork before, it catches you off guard, mostly because it feels like a strange throwback in an otherwise digital sourcing process.
I have coached hundreds of sellers through supplier onboarding, and this exact moment trips up a surprising number of them, usually because they assumed their entire sourcing process would stay digital from start to finish. Below is a practical walkthrough of the specific documents ecommerce sellers most often need to fax, how to prepare each one correctly, and how to avoid the mistakes that slow down supplier approval.
Before you run into your first supplier fax request, it is worth having an account ready with a service like FAX.PLUS, which offers a free tier that covers the occasional documents most sellers need to send during onboarding. Setting it up in advance means a supplier’s paperwork request never becomes a bottleneck.
Where This Fits Into Your Sourcing Process
If you are still early in deciding whether this business model is right for you, our guide to what high-ticket dropshipping actually involves covers the supplier relationships and paperwork expectations that make guides like this one necessary in the first place. Faxed paperwork is a small but recurring piece of that supplier relationship, and knowing what to expect ahead of time removes one more unknown from getting your first wholesale accounts approved.
Why Suppliers Still Ask for Faxed Documents
Most wholesale suppliers, especially smaller manufacturers and distributors that have been operating for decades, built their document intake process around fax long before email became standard business practice. Rather than rebuild that entire workflow, many simply kept fax as an accepted or preferred channel, often because it creates an automatic timestamp and paper trail that satisfies their internal compliance requirements more clearly than an email attachment does.
The Reseller or Wholesale Agreement
This is the document you will encounter most often. Suppliers use it to establish that you are buying at wholesale prices for resale rather than personal use, and it typically includes your business information, tax ID, and a signature confirming you agree to their terms, such as minimum order quantities or MAP pricing policies.
To fax this correctly, read through the entire agreement before signing, since some suppliers bury pricing or minimum order requirements in the fine print. Sign every page that requires a signature, not just the last one, since suppliers frequently reject incomplete submissions and ask you to resend the whole document, costing you days you did not need to lose.
The W-9 Form
A W-9 provides your taxpayer identification information to a supplier or partner who may need to report payments to you. Fill this out carefully and completely, since a missing entity type checkbox or an unsigned certification section is one of the most common reasons a supplier bounces it back and asks you to resubmit. Double-check that the business name and tax ID you provide match what is on file with the IRS exactly, since a mismatch can cause processing delays on the supplier’s end that have nothing to do with your actual application.
Resale Certificates and Tax Exemption Forms
If you are purchasing wholesale inventory for resale, many suppliers require a copy of your state resale certificate before they will waive sales tax on your wholesale orders. This document usually needs to be faxed or emailed as a clear, complete scan, not a partial or cropped image, since suppliers typically file these for their own tax compliance and need every field legible. If you operate in multiple states or sell across state lines, confirm with each supplier exactly which certificate they need, since requirements vary and a supplier will not proceed until they have the correct one on file.
Credit Applications for Net Terms
Some suppliers offer net-30 or net-60 payment terms once you have an established relationship, and getting approved typically requires a credit application faxed along with a few trade references. Fill in every reference field with a current, working contact, since suppliers routinely call to verify these before extending credit, and an unreachable reference is a common reason credit applications get delayed or denied outright.
How to Prepare Any of These Documents for Faxing
Regardless of which specific form you are sending, the preparation steps stay the same. Fill out every required field completely rather than leaving anything blank that does not clearly apply to you, since an incomplete form often gets rejected outright rather than partially processed. Sign in the correct location, and if the form requires an initial on specific pages in addition to a final signature, do not skip those. Scan or photograph the completed document clearly, using a fax provider’s mobile app if you are working from a printed copy, and review the resulting file before sending to confirm every page is legible and none are cut off or blurry.
Sending the Document
Once your document is ready, log into your online fax account, upload the file, and enter the supplier’s fax number exactly as provided, including the correct area code. If the supplier gave you a specific attention line or department, include a brief cover page noting who the fax is for, since general supplier fax lines often serve multiple departments and a cover page helps route your submission to the right person faster.
Confirming Your Supplier Received It
Check your fax service’s delivery confirmation immediately after sending, and save or screenshot it. If you do not hear back from the supplier within a reasonable window, typically two to three business days depending on their stated processing time, follow up by phone or email with your delivery confirmation in hand rather than assuming the document went unnoticed. Suppliers process a high volume of incoming paperwork, and a polite follow-up referencing your confirmed send time is usually all it takes to move things along.
What Happens If You Do Not Have a Fax Machine and Have Never Used Online Fax
If this is your first time using an online fax service, the full walkthrough of the sign-up and sending process is covered step by step in our guide on how to send a fax online without a fax machine. The short version is that it takes only a few minutes to set up and works entirely from your phone or computer, with no physical hardware required.
Timing Your Fax Around Supplier Onboarding
Supplier onboarding often moves faster than sellers expect once the paperwork is in order, so having your fax account, your completed W-9, and your resale certificate ready before you start reaching out to suppliers can shave days off your timeline. Our guide on finding the best suppliers for high-ticket dropshipping walks through the full vetting and outreach process, and having your documentation ready in advance means you can move straight from a positive supplier conversation to a signed agreement without a multi-day paperwork gap in between.
Business Formation Paperwork That Sometimes Requires Fax
It is not only suppliers who ask for faxed documents. Some banks and state agencies still require a faxed signature page as part of opening a business bank account or finalizing LLC formation paperwork. If you are working through the steps in our business formation guide, keep your fax account handy for this stage as well, since it can come up unexpectedly even in an otherwise fully online application process.
Niches Where This Comes Up Most
Fax requirements are far more common in some product categories than others. Sellers sourcing in furniture, medical and mobility equipment, industrial and commercial tools, and major appliances tend to run into it more frequently, since many suppliers in those spaces have been operating the same way for decades. Our high-ticket niches list covers dozens of categories worth considering, and if you are choosing between niches, it is worth factoring in that some supplier relationships will require more of this kind of paperwork than others.
Freight Claims Paperwork
Beyond onboarding, faxed paperwork tends to resurface any time a high-ticket shipment arrives damaged. Freight carriers and insurance adjusters commonly require a signed claim form submitted by fax before they will process a damage claim, and having an account ready before that first damaged pallet shows up saves real time when a claim deadline is running.
How Suppliers Verify What You Send
Larger wholesale distributors often cross-check your resale certificate and W-9 against state and federal databases before finalizing an account, which is one reason an illegible or partially completed scan causes real delays rather than a quick fix. According to guidance frequently cited on G2 for B2B onboarding software, incomplete vendor documentation is consistently ranked among the top reasons new business accounts stall during setup, whether the process is happening through fax, email, or a dedicated portal.
Some larger suppliers have started layering fax alongside digital verification tools, and platforms tracked on Capterra for supplier onboarding show a similar pattern industry-wide: fax has not disappeared, but it increasingly coexists with digital verification steps rather than standing alone as the only channel.
Keeping Your Documents Organized for Future Suppliers
Once you have a completed, signed W-9 and a scanned resale certificate ready to go, save clean digital copies of both so you are not filling out the same forms from scratch every time a new supplier asks for them. A simple folder labeled with your business documents, kept somewhere you can access from your phone, turns what could be a ten-minute task into something you can complete in under a minute for your next supplier application. Research summarized by SoftwareAdvice on small business document management points to exactly this kind of reusable template system as one of the simplest ways sellers save time on recurring administrative tasks.
When a Supplier’s Fax Request Signals Something Worth Noticing
Occasionally, the specific paperwork a supplier requests tells you something about how they operate more broadly. A supplier that requires a notarized signature, a faxed original rather than a scanned copy, or an unusually detailed credit application is often a larger, more established operation with formal compliance requirements, which can be a positive signal about their reliability as a long-term partner. On the other hand, a supplier with unusually loose paperwork requirements is not necessarily a red flag on its own, but it is worth applying the same scrutiny you would to any new sourcing relationship regardless of how much documentation they ask for upfront.
Common Mistakes That Slow Down Supplier Approval
The most frequent mistake is submitting an incomplete form, whether that means a missing signature, an unchecked box, or a blank field that the supplier actually needed filled in. The second most common mistake is sending a blurry or partially cut-off scan, particularly when photographing a document with a phone rather than using a proper scanner or a fax app’s built-in scanning tool. Both mistakes cause the same outcome: the supplier bounces your submission back and asks you to resend, adding days to a process that should have taken minutes.
A less obvious mistake is not keeping a copy of what you sent. Save a copy of every completed form before you fax it, so if a supplier claims they never received a specific document or asks a question about what you submitted, you can answer immediately instead of digging through old files or resending from memory.
What to Do If a Supplier’s Fax Number Does Not Work
Occasionally a fax number listed on a supplier’s website or application form is outdated or no longer in service. If your fax fails to deliver, do not assume the supplier no longer accepts fax entirely. Call their office directly to confirm the current number, since suppliers sometimes update their fax line without updating every piece of marketing material or every version of their onboarding paperwork that is circulating. A quick phone call here usually resolves the issue faster than repeatedly resending to a number that was never going to work.
Handling Paperwork for Multiple Suppliers at Once
If you are reaching out to several suppliers in the same week as part of building out your product catalog, it helps to track which documents you have sent to which supplier and when. A simple spreadsheet with columns for supplier name, documents sent, date sent, and approval status prevents the common problem of losing track of which reseller agreement is still pending and which one already came back approved. This becomes especially useful once you are managing five or more supplier relationships simultaneously, since the paperwork details start to blur together without some kind of system to track them.
Frequently Asked Questions
Do all suppliers require faxed paperwork, or is email usually enough?
It varies by supplier. Many now accept email as an alternative, but a meaningful number, especially smaller and more established wholesale distributors, still specify fax as their preferred or required submission method for certain documents like signed agreements or tax forms.
Can I fax a W-9 or resale certificate directly from my phone?
Yes. Most online fax apps let you photograph a completed paper form or upload a digital PDF and send it as a fax directly from your phone, without needing a scanner or computer.
What should I do if a supplier says they never received my fax?
Check your fax service’s delivery confirmation first, since it will show whether the transmission actually succeeded. If delivery was confirmed on your end, resend the document along with your confirmation details rather than assuming the fault was on your side.
Is it safe to fax a W-9 with my tax ID on it?
Reputable online fax services encrypt transmissions, and faxing a W-9 carries similar security considerations to emailing one as an attachment. Use an established, reputable fax provider rather than an unfamiliar free tool with no clear privacy policy.
How long should I wait before following up on a faxed application?
Most suppliers process incoming paperwork within two to three business days. If you have not heard anything after that window, a polite follow-up call or email referencing your delivery confirmation is a reasonable next step.
Building This Into Your Supplier Onboarding Process
Treating fax as a routine, five-minute step rather than an unexpected obstacle makes supplier onboarding noticeably smoother. If you want this and every other piece of your supplier vetting and onboarding process handled correctly from the start, our done-for-you service builds this kind of operational detail directly into your store setup. If you would rather work through it yourself with guidance, our coaching program covers supplier paperwork alongside every other step of building a high-ticket dropshipping business.
For a broader overview of what building this kind of business actually involves, visit Ecommerce Paradise. You can also grab our free beginner’s guide to get oriented before you start reaching out to suppliers.
Trevor Fenner is an ecommerce entrepreneur and the founder of Ecommerce Paradise, a platform focused on helping entrepreneurs build and scale profitable high-ticket ecommerce and dropshipping businesses. With over a decade of hands-on experience, Trevor specializes in high-ticket dropshipping strategy, niche and product selection, supplier recruiting and onboarding, Google & Bing Shopping ads, ecommerce SEO, and systems-driven automation and scaling. Through Ecommerce Paradise, he provides free education via in-depth guides like How to Start High-Ticket Dropshipping, advanced training through the High-Ticket Dropshipping Masterclass, and fully done-for-you turnkey ecommerce services for entrepreneurs who want a faster, more hands-off path to growth. Trevor is known for emphasizing sustainable, real-world ecommerce models over hype-driven tactics, helping store owners build scalable, sellable, and location-independent brands.
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