W-9 requirements for vendors are one of the most overlooked areas of accounts payable compliance, and the consequences of ignoring them show up every January. Collecting W-9 forms from vendors on an ongoing basis is a critical accounting practice that directly affects your ability to file accurate 1099s on time. When businesses wait until year-end to gather this documentation, they face rushed timelines, unresponsive vendors, and a real risk of IRS penalties.
This article explains why ongoing W-9 collection matters, what the IRS expects, and how accounting teams can build a process that eliminates the January scramble.
What is a W-9 form and why do vendors need to provide one?
A W-9, formally titled “Request for Taxpayer Identification Number and Certification,” is an IRS form that businesses use to collect a vendor’s legal name, address, taxpayer identification number (TIN), and federal tax classification. You need this information to accurately report payments on Form 1099-NEC or 1099-MISC at the end of each tax year.
Businesses generally need a W-9 from any vendor whose payments reach the 1099 reporting threshold during a calendar year and who is not operating as a C corporation. That threshold is changing. For payments made in 2025, the long-standing $600 floor for Forms 1099-NEC and 1099-MISC still applies. Under the One Big Beautiful Bill Act (Section 70433), the threshold rises to $2,000 for payments made beginning in 2026, and it will be indexed for inflation starting in 2027. Without a valid W-9 on file, your business cannot complete 1099 preparation accurately, which puts you at risk for penalties and incorrect filings.
Collecting a W-9 is not a one-time task. Vendors change their legal names, entity types, and TINs over time. A form collected three years ago may no longer reflect the vendor’s current information, which means your 1099 filing could contain errors even if you had a W-9 on record.
Why ongoing W-9 collection reduces compliance risk
Many businesses treat W-9 collection as a year-end activity, requesting forms from vendors in December or January right before the 1099 filing deadline. This approach creates several problems that ongoing collection solves.
IRS compliance starts before the first payment
The IRS expects you to have taxpayer identification information on file before you issue payments to a vendor. Waiting until year-end to request a W-9 means you may have been making payments for months without the documentation the IRS requires. Ongoing W-9 collection ensures you meet this requirement by making the form part of your vendor onboarding process.
Year-end workload drops significantly
Accounting teams already face heavy workloads in January with year-end close, financial reporting, and audit preparation. Adding a vendor document chase to that list diverts staff time from higher-priority tasks. When W-9 forms are collected throughout the year as part of normal vendor management, the 1099 preparation process becomes a matter of data validation rather than data collection.
Errors and penalties decrease
Incomplete or incorrect tax information is a leading cause of 1099 filing errors. For information returns required to be filed in 2026, the IRS can impose penalties ranging from $60 to $340 per form for late or incorrect filings, and those penalties increase if the IRS determines the failure was due to intentional disregard. Maintaining current W-9s throughout the year reduces the likelihood of filing with outdated TINs, misspelled legal names, or incorrect entity classifications.
Risks of waiting until January to collect W-9 forms
Delaying W-9 collection until the 1099 filing deadline is approaching creates a cascade of operational and compliance problems.
Vendors are often unresponsive during the holiday season and early January. Many small vendors and independent contractors do not prioritize returning tax forms quickly, especially if they are managing their own year-end obligations. This means your accounting team spends valuable time sending follow-up emails, making phone calls, and tracking down documentation instead of focusing on accurate reporting.
Missing W-9 data also increases the likelihood that you will need to file extensions or submit corrected 1099s. Both of these outcomes carry costs: filing extensions can trigger IRS scrutiny, and corrected forms require additional staff time and create confusion for vendors who receive multiple versions of their tax documents.
In some cases, businesses resort to backup withholding at a rate of 24% when a vendor fails to provide a valid TIN. While backup withholding protects the business from penalties, it creates friction with vendors who see a significant portion of their payment withheld unexpectedly.
How to build an effective W-9 collection process
Creating a reliable system for vendor tax compliance does not require expensive software or a dedicated team. It requires discipline and a few process changes that integrate W-9 collection into your existing accounts payable workflow. Businesses that outsource this work through client accounting services can offload vendor onboarding and 1099 preparation entirely.
Collect W-9s during vendor onboarding
The simplest and most effective step is to require a completed W-9 before issuing a vendor’s first payment. Make the W-9 a mandatory part of your vendor setup process, alongside banking information and contract documents. No W-9, no payment: this policy ensures you never start a vendor relationship without the documentation you need for 1099 compliance.
Review and update W-9s annually
Even with strong onboarding practices, vendor information changes. Set a recurring annual review to request updated W-9s from all active vendors. Many businesses schedule this review in the third or fourth quarter, giving vendors time to respond before the year-end reporting period begins. This annual touchpoint catches changes in entity type, address, or TIN before they become filing problems.
Use a centralized tracking system
Whether you use accounting software with built-in vendor management, a shared spreadsheet, or a dedicated compliance platform, keep all W-9s in a single, organized location. Track the date each W-9 was received, flag vendors with missing or outdated forms, and set reminders for annual updates. A centralized system makes it easy to audit your records and identify gaps before they become urgent.
Validate TINs before filing
The IRS offers a TIN matching program that allows businesses to verify vendor TINs against IRS records before filing 1099s. Running TIN validation as part of your W-9 collection process catches discrepancies early, giving you time to request corrections from vendors rather than discovering errors after forms have been filed.
The connection between W-9 collection and 1099 preparation
W-9 collection and 1099 preparation are two halves of the same compliance obligation. The W-9 provides the data, including legal name, TIN, and entity classification, that populates your 1099 forms. When that data is accurate and current, 1099 preparation becomes a straightforward process of matching payment totals to vendor records.
When W-9 data is missing or outdated, 1099 preparation turns into a multi-week project that consumes staff time, delays filings, and increases the risk of IRS penalties. Businesses that invest in ongoing W-9 collection consistently report smoother year-end closes and fewer corrected filings. A proactive approach here also pairs well with broader tax advisory services that keep reporting obligations on track throughout the year.
The 1099 filing deadline for Form 1099-NEC is January 31, with no automatic extension available. That tight deadline makes it essential to have all vendor documentation in order well before the new year begins.
Best practices for maintaining vendor tax compliance year-round
Strong vendor tax compliance is not just about avoiding penalties. It also supports better vendor relationships and more efficient operations. Here are the key practices that keep your W-9 records current and your 1099 filing on track.
Establish a written policy that requires W-9 collection before any vendor’s first payment. Communicate this policy to all departments that engage vendors, including procurement, marketing, and facilities. Assign ownership of W-9 tracking to a specific person or team within accounts payable. Schedule a quarterly or annual review cycle to refresh W-9s for active vendors. Document your process so it survives staff turnover and remains consistent year over year.
These practices apply whether your business manages ten vendors or ten thousand. The scale of the effort changes, but the principle stays the same: collect early, update regularly, and never wait until January.
Frequently asked questions
When should you collect a W-9 from a vendor?
You should collect a W-9 from a vendor before issuing their first payment. The IRS expects businesses to have taxpayer identification information on file before making reportable payments. Waiting until year-end to request W-9s creates compliance risk and increases the chance of filing errors on 1099 forms.
What happens if a vendor refuses to provide a W-9?
If a vendor refuses to provide a W-9, you are required to begin backup withholding at a rate of 24% on all payments to that vendor. Backup withholding protects your business from IRS penalties but reduces the vendor’s net payment. Most vendors will provide a W-9 promptly once they understand the withholding consequences.
How often should W-9 forms be updated?
W-9 forms should be reviewed annually for all active vendors. Vendors may change their legal name, entity type, address, or TIN over time, and outdated information leads to incorrect 1099 filings. An annual review cycle, ideally in the third or fourth quarter, gives you time to collect updates before year-end reporting.
What are the IRS penalties for incorrect 1099 filings?
For information returns filed in 2026, IRS penalties for incorrect or late 1099 filings range from $60 to $340 per form, depending on how late the correction is made. If the IRS determines the error was due to intentional disregard, the penalty increases to $680 per form with no maximum cap. These amounts are adjusted for inflation each year, so confirm the current figures with the IRS before filing. Maintaining accurate W-9 records is the most effective way to avoid these penalties.
Do you need a W-9 from vendors paid below the 1099 threshold?
Generally, you are not required to file a 1099 for a vendor whose payments stay below the reporting threshold for the year, so a W-9 is not strictly necessary in those cases. The threshold is $600 for payments made in 2025 and rises to $2,000 for payments made beginning in 2026 under the One Big Beautiful Bill Act. Even so, collecting a W-9 from all vendors as a standard practice is still recommended. Payment amounts can increase during the year, and having the form already on file avoids a scramble if the threshold is crossed.
What is the difference between a W-9 and a 1099?
A W-9 is a form that vendors complete to provide their taxpayer identification information to your business. A 1099 is the form your business files with the IRS to report payments made to that vendor during the tax year. The W-9 supplies the data needed to prepare accurate 1099s, and the two forms work together as part of your vendor tax compliance process.
