Managing taxpayer identification numbers (TINs) may seem like a routine administrative task, but inaccuracies can lead to significant compliance risks if not addressed proactively. Managing vendor records, preparing for 1099 filings, and staying compliant means ensuring the TIN is correct. But what happens when you have hundreds or even thousands of records to verify? The answer is bulk TIN matching.
We will go through the step-by-step process of bulk TIN validation, so you know what to expect and how to make it work for you.
What is Bulk TIN Matching?
Bulk TIN matching enables the verification of a large number of name and TIN combinations against IRS records in a single action. The pairings may include employer identification numbers (EINs) or Social Security numbers (SSNs), and the associated legal business name or individual’s name.
Rather than having to individually verify every single entry, the batch process enables you to supply a file of hundreds, or even thousands, of entries and receive results indicating whether each entry validated with the IRS. This faster and more reliable process reduces errors, minimizes the risk of backup withholding notices, and supports ongoing IRS compliance.
Consider it a spellcheck for all of your tax data, except instead of typos, it is finding mismatches between your records and the IRS records.
Submission Process and Data Preparation
However, before you can hit “submit,” there’s some preparatory work required.
The most important step is ensuring your data is complete and correct. Ensure your data is complete and correct. If you are verifying records for a large vendor or employee base, some of those details have changed; maybe the vendor changed their business name, merged with another company, or simply got a new EIN. If your records haven’t been updated to reflect such changes, you may be at risk of compliance failures or IRS notices.
You will have to combine all the TIN/name combinations you want to look up, usually in a spreadsheet or flat file format that complies with IRS requirements. Double-check for things like:
- Typos in names
- Missing or incomplete TINs
- Extra spaces or formatting errors
- Duplicates
Minor errors like these can lead to mismatches, regardless of whether the data is correct. The cleaner your file is upfront, the smoother the validation process will be.
Validation Process and Result Compilation
Once you have prepared and submitted your file, it is encrypted in our system and securely uploaded to the real-time API TIN Matching portal, where each TIN/name combination is cross-referenced against IRS records.
- Match – The name and TIN combination is correct and matches IRS records.
- Mismatch – The TIN and name don’t match what’s on file.
- Invalid TIN – The TIN formatting is incorrect or the TIN does not exist/has recently changed.
After validation, you will get a reply file with the results. Depending on your system (e.g., TINValidation.com), the results may be available as a downloadable data file or through a dashboard that offers insights, filters, and summaries to support decision making.
Processing Time and Final Reporting
Then, how long is the whole process? The processing time varies depending on file size and complexity.
The typical processing time is 24 to 48 hours for complete bulk TIN matching files; however, it may take up to 72 hours if the files exceed a specific size or are more custom-built. That’s a fast turnaround considering the volume of data being processed.
You will need to review the full report once the results are in. This report is your guide for:
- Which TIN/name combinations matched successfully
- Which entries failed or are considered high-risk
- Common trends, like repeat offenders or frequent mismatches
- Percentages of clean vs. problematic records
This kind of insight is invaluable, particularly if you’re manually overseeing compliance for a large vendor base or attempting to bring records up-to-date before a year-end tax return.
Taking Corrective Action
Reviewing and acting on the results is essential. Addressing mismatches promptly helps avoid penalties, IRS B & P-Notices, and costly delays in your reporting cycle.
Here’s what that usually looks like:
- Contact vendors or contracting officers representing vendors with incorrect or expired TINs. For example, they may need to resubmit a W-9 or confirm their legal name.
- Create an evidence log of your validation efforts. It is highly beneficial if the IRS ever audits your 1099 process to be able to show that you did TIN matching and you followed up on mismatches.
- Update your internal systems with clean, validated data. That way, when it comes time to issue 1099s or other tax forms, everything is prepared and ready, and you’re less likely to get B or P-Notices from the IRS.
Why Use TINValidation.com for Your Bulk TIN Matching Needs
Now, you could go directly through the IRS’s TIN Matching Program—but managing all the formatting, processing, and back-and-forth can be clunky, especially if you don’t do this kind of thing every day.
That’s where TINValidation.com comes in.
We simplify the bulk TIN validation process from start to finish:
- Easy file uploads – Just drag and drop your data file. No complex formatting required.
- Fast turnaround – Most validations are completed and returned in less than 48 hours.
- Smart reporting – You’ll get clean, easy-to-read results that highlight which records need attention.
- Secure and compliant – Your data is encrypted, protected, and handled in line with IRS standards.
- Support when you need it – Have a question or need help interpreting results? We’re here to help.
We’ve helped thousands of businesses streamline the TIN validation process, reduce mismatches, and maintain full IRS compliance. Whether you have 200 or 20,000 vendors, our platform handles the complexity so your team doesn’t have to.
