Get accurate TIN verification in seconds to confirm real business entities - and layer on EIN checks, UBO signals, and Secretary of State data for deeper KYB coverage.
From SSN and EIN to ITIN and business TINs, validate every tax identification number to form trust business relationship
One incorrect TIN can disrupt payments, filings, and trigger compliance issues during audits. With Signzy, you can run both basic and advanced TIN checks with one API.
Deals move fast, and your verification should too. In a few seconds, Signzy validates EIN and TIN ID, and pulls key business details, helping you close deals quicker without compromising on due diligence.
Signzy's TIN lookup API searches across 50 U.S. Secretary of State databases, giving you complete view of a company's registrations, presence, and business footprint.
Verification that secures and does not slow you down.
Instant TIN no. search helps you validate legitimacy, spot risky entities, and prevent fraud before deals move forward.
Tax Compliance - Fraud Prevention - Business Verification - Bank Account Opening - Government Benefits
Avoid fraud, chargebacks, and IRS issues by verifying business TINs before onboarding or payouts.
Validate vendors upfront so one bad supplier doesn’t disrupt your orders, inventory, or customer trust.
Stop false providers and bogus claims early with a quick TIN check tied to real public records.
Make sure the entity on your contract actually exists and matches official filings before you proceed.
Verify businesses before granting access so you don’t onboard fake entities or expose your platform to risk.
From banks to fintechs, Signzy processes millions of verification checks every day with consistent performance, regulatory compliance, and enterprise-grade reliability.
From banks to fintechs, Signzy processes millions of verification checks every day with consistent performance, regulatory compliance, and enterprise-grade reliability.
Kinds words by clients
CPO, ASAPP Financial Technology
Working with Signzy has been a game-changer. Their team isn't just responsive, they're deeply invested in helping us solve real onboarding and compliance challenges. The flexibility of their product, the speed of execution, and their commitment to partnership have set a new bar for us.
Developer Docs >>>Developer Docs
With Signzy, TIN is just the beginning. Use the same KYB infrastructure to validate EINs, pull state filings, check UBOs, detect shell companies, screen for sanctions, and monitor risk - all with one integration.
Get accurate validation of EINs against official records to support KYB, vendor onboarding, employee checks, contract management, and more.
Perform business entity search across 50 U.S. States with reliable SOS data, so you only work with trusted businesses.
Learn the beneficial ownership, control, and shareholder structures of a business you’re working with and dodge any risks of money laundering.
Instantly validate Social Security numbers with checks for issuance status, death records, name and DOB match, and more.
Integrate the platform during lunch hour, customize based on your needs, and go live within 2-4 weeks :)
What is TIN verification?
TIN verification is the process of confirming whether a Tax Identification Number is valid and correctly associated with the individual or business that provided it. This helps prevent fraud, filing errors, and compliance issues during vendor onboarding, payouts, or contract reviews.
What types of TINs can Signzy verify?
Signzy can verify multiple TIN types, including EIN (Employer Identification Number) for businesses, SSN (Social Security Number) for individuals, and other U.S. tax identifiers used in business onboarding or regulatory checks.
How does TIN verification help prevent fraud?
TIN verification ensures the tax ID belongs to a real, registered entity. By instantly matching the number to official records, businesses can block fake vendors, shell companies, and fraudulent applicants before they cause financial or compliance damage.
Does TIN verification help with IRS compliance?
Yes. Accurate TIN matching helps prevent IRS B-Notices, penalties, payment delays, and filing issues. Automated verification reduces manual mistakes and keeps records aligned with tax reporting requirements.
How fast is Signzy's TIN verification API?
Signzy provides real-time results. You can validate TINs, EINs, and associated business details in seconds, enabling faster vendor onboarding and contract approvals.
Can Signzy verify the business behind the TIN as well?
Yes. Beyond validating the TIN itself, Signzy can pull EIN details, state registrations, business status, and entity information, giving a fuller view of the company behind the tax ID.
Is TIN verification useful for KYB (Know Your Business)?
Absolutely. TIN checks form a core part of KYB workflows by confirming the business exists, is registered, and has a valid tax identity. You can combine TIN verification with state filings, UBO checks, and other KYB data.
Which industries use TIN verification most?
Financial services, fintech, eCommerce, insurance, SaaS, marketplace platforms, and professional services use TIN checks to validate vendors, partners, borrowers, and beneficiaries before onboarding.
Can TIN verification be automated into existing onboarding flows?
Yes. Signzy's API integrates directly into your onboarding platform, CRM, vendor management system, or compliance stack, enabling automated, real-time TIN checks without manual steps.
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