Last updated: April 2026
I learned about TIN penalties the expensive way. A client filed 340 1099-NEC forms in January, and 23 came back with name/TIN mismatches. At $310 per incorrect form (the 2026 penalty rate, up from $260 in prior years), that was $7,130 in avoidable fines. Every single mismatch was a typo or a contractor who had changed their legal name. A 30-second verification before filing would have caught all 23.
TINCheck by Sovos does exactly that verification. Enter a name and TIN (SSN, EIN, or ITIN), and it matches against IRS records in 2-5 seconds. Pass or fail. It also simultaneously screens against OFAC sanctions lists, the Death Master File, and 30+ other government watchlists. One check covers the IRS match and regulatory screening in a single lookup.
Backed by Sovos, one of the largest tax compliance platforms globally, with over 15,000 enterprise customers. TINCheck is their self-service product aimed at small and mid-size businesses that need TIN validation without a full Sovos enterprise contract.
Run Your First TIN Check FreeI Ran 50 Checks. Here Is What the Process Looks Like.
I tested TINCheck with a batch of 50 contractor records from a staffing agency client. The web interface is straightforward: enter the legal name, enter the TIN, click verify. Results come back in 2-5 seconds with a clear pass/fail indicator.
Out of 50 checks, 46 passed immediately. Three came back as mismatches (the name on file did not match the IRS record), and one was flagged on the Death Master File. The three mismatches turned out to be two name changes (marriage, legal name update) and one data entry error where a digit was transposed. The Death Master File flag was a false positive: the contractor was very much alive, but shared a name with a deceased individual in another state.
That false positive highlights something important. TINCheck's multi-database screening catches real issues, but it also generates noise. OFAC and Death Master File screening will flag common names (think "John Smith" or "Maria Garcia") at a higher rate. Each flag requires manual review to confirm or dismiss. For a 50-record batch, I spent about 15 minutes on manual review. For a 5,000-record batch, plan for a few hours or assign it to a team member.
The good news: each result creates an audit trail. If the IRS ever questions a filing, you have timestamped proof that you verified the TIN before submitting. That documentation can reduce or eliminate penalties under the "reasonable cause" defense.
Bulk Verification for Year-End Filing Crunch
Individual checks work for ongoing vendor onboarding. But most businesses need to validate hundreds or thousands of TINs at once during year-end 1099 season. TINCheck's bulk file processing lets you upload a CSV with thousands of records and get results within 24 hours.
I uploaded a file with 200 records. Results came back in about 6 hours (TINCheck says up to 24 hours, so this was faster than expected). The output file flagged 11 mismatches and 2 watchlist hits. Formatting was clean: original record plus pass/fail status, mismatch details, and watchlist results in additional columns.
Bulk pricing starts at $185 per file for up to 1,000 records. That works out to $0.185 per check at volume, which is significantly cheaper than the monthly plan rates. If your verification needs are seasonal (the January 1099 crunch) rather than ongoing, bulk files are the more cost-effective option.
B-Notice tracking is bundled with the bulk processing. When the IRS sends a B-Notice for a name/TIN mismatch, you have 15 business days to respond or begin backup withholding at 24%. TINCheck tracks these deadlines and flags upcoming due dates. Missing a B-Notice deadline is one of the most common compliance mistakes small businesses make, and the backup withholding obligation creates real accounting headaches.
See TINCheck Bulk Processing PlansAPI Integration for Vendor Onboarding
TINCheck offers both REST and SOAP APIs for embedding verification directly into your workflows. The use case is clear: instead of collecting a W-9 from a new contractor and verifying their TIN months later at filing time, you verify it at the point of data entry. If the TIN does not match, you flag it immediately and ask the contractor to correct it before any work begins.
For companies onboarding dozens of contractors monthly (staffing agencies, gig platforms, property management firms), the API eliminates the manual verification bottleneck entirely. I reviewed the API documentation: the REST endpoint accepts name and TIN, returns a JSON response with match status, watchlist results, and confidence scores in under 5 seconds. Standard webhook callbacks are supported for async bulk requests.
The SOAP API is there for older enterprise systems that have not migrated to REST. If you are building a new integration in 2026, use REST. The SOAP option exists purely for legacy compatibility.
Pricing by Volume
Monthly plans based on check volume:
- 25 checks/month: $19.95/month ($0.80 per check)
- 100 checks/month: $49.95/month ($0.50 per check)
- 500 checks/month: $249.95/month ($0.50 per check)
- 1,000 checks/month: $499.95/month ($0.50 per check)
- 5,000 checks/month: $1,299.95/month ($0.26 per check)
Prepaid annual bundles are available at a discount. The 50-check annual bundle is $44.95 ($0.90 per check). Bulk file processing starts at $185 per file for up to 1,000 records. Your first check is free on any plan. Unlimited users on all plans, so your entire accounting team can run verifications without per-seat charges.
For comparison: Tax1099's TIN matching service costs about $0.50 per check at volume, similar to TINCheck's mid-tier pricing but without the OFAC/watchlist screening. The IRS offers a free TIN matching program (Interactive TIN Matching), but it only handles SSN/EIN validation, has no watchlist screening, requires IRS e-Services enrollment, and is limited to 25 lookups per session. For businesses needing both IRS matching and regulatory screening in one tool, TINCheck is the more complete option.
What TINCheck Does Well
- 30+ databases in one check: IRS TIN matching, OFAC sanctions, Death Master File, and address validation all run simultaneously. You do not need to check each database separately.
- Speed: 2-5 seconds for real-time checks. Fast enough to embed in a vendor onboarding form without adding friction.
- Audit trail for penalty defense: Every check is timestamped and logged. If the IRS disputes a filing, you have documented proof of verification. This is the "reasonable cause" defense that can reduce or eliminate penalties.
- Sovos backing: Sovos is a 25-year-old compliance platform with 15,000+ enterprise clients. TINCheck is not going to disappear overnight. The parent company's infrastructure is solid.
- Unlimited users: No per-seat pricing. Your entire team can run checks without worrying about license counts.
Where TINCheck Falls Short
- The interface feels outdated: It works, but the UI looks like it was designed in 2015. Navigation is clunky, the dashboard is text-heavy, and there are no data visualizations or trend charts. For a tool you might use once a quarter, it is tolerable. For daily use, it gets frustrating.
- OFAC false positives on common names: If you verify vendors named "Mohamed Ali" or "Carlos Rodriguez," expect watchlist flags that require manual review. The screening is doing its job, but the false positive rate on common names adds work that pure TIN-matching tools avoid.
- No mobile app: Browser-only. If your team does vendor onboarding in the field (construction, events, field services), they need a laptop to run checks. No iOS or Android app exists.
- Overkill for very small businesses: If you file fewer than 50 1099s per year and do not need OFAC screening, the IRS free TIN matching program handles basic validation at zero cost. Paying $19.95/month for 25 checks is hard to justify when the IRS tool is free, even if it is clunkier.
- No native integrations with accounting software: There are no built-in connections to QuickBooks, Xero, Gusto, or other payroll platforms. If you want automated verification when creating a new vendor in your accounting software, you need to build a custom API integration or use Zapier as middleware.
TINCheck is the right tool for businesses filing 50+ information returns annually: staffing agencies, property management firms, financial institutions, gig platforms, and any company with a large contractor base. At $310 per IRS penalty for an incorrect TIN, a single caught mismatch pays for several months of the subscription. Start with the free first check to test the interface, then pick the monthly plan that matches your verification volume.
Verify Your First TIN Free
