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New York State Sales Tax Guide
New York sales & use tax

The Certificate of Authority

New York's sales tax registration. Apply at least 20 days before you begin business — operating without one runs to $10,000 in penalties.

Reviewed against published state sources on August 21, 2026. Rules and figures change — always confirm with the agency before acting.

Ready to file? Returns are filed with the New York State Department of Taxation and Finance, never through this site.Log in to Online Services →Opens ols.tax.ny.gov, the Department's Tax Online Services Portal — the shortest route to Sales Tax Web File, which is otherwise several clicks deep. Sign in with your NY.gov ID; Web File itself cannot be bookmarked and is only reachable once you are logged in. New vendors can create a Tax Online Services account from the same page.

Who needs one

The Department's Tax Bulletin TB-ST-360 states it plainly: if you will be making sales in New York State that are subject to sales tax, you must register with the Tax Department and obtain a Certificate of Authority. The certificate is what authorises you to collect tax and to issue and accept most New York exemption documents.

The 20-day rule

Timing

Register at least 20 days before you begin business. The Department repeats this in both the bulletin and the Form DTF-17 instructions, which phrase it as 20 days before you make any taxable sale.

How to apply

Where
New York Business Express — the online application route. A NY.gov Business account is required.
Form
DTF-17, Application to Register for a Sales Tax Certificate of Authority, with instructions at DTF-17-I.
Delivery
The certificate is mailed once the application is approved.
Fee
The Department does not state a fee for the Certificate of Authority on its registration page, in TB-ST-360, in the DTF-17 instructions or in Publication 750. The widely repeated claim that it is free is not something we could source to the Department — confirm with the Department if the answer matters to you.

Regular versus temporary

A temporary Certificate of Authority is available only if you expect to make taxable sales in New York for no more than two consecutive sales tax quarters in any twelve-month period. It expires automatically on the end date you specify. Show and entertainment vendors must obtain a regular certificate and cannot use a temporary one.

Display, and the penalties for not having one

The certificate must be prominently displayed at each place of business; mobile vendors attach it to the cart, truck or stand.

SituationPenalty
Making sales or purchases without a valid Certificate of AuthorityUp to $500 for the first day on which sales or purchases are made, plus up to $200 for each subsequent day, to a maximum of $10,000
Failure to display the certificate$50

Renewal, changes and surrender

The Department does not publish a routine renewal cycle for a regular Certificate of Authority. In practice it remains in force until it is surrendered or revoked — the Department states that a certificate is no longer valid once it has processed a final return and inactivated the account. Temporary certificates do expire automatically.

Amendments — a change of address, ownership structure or business activity — and surrender on closing are handled through the Department's process described in Tax Bulletin TB-ST-25.

Registered means filing

Publication 750 makes a point that catches dormant businesses: “Once you receive your Certificate of Authority, you are considered to be in business for sales tax purposes even if you never make a sale.” The filing obligation starts with the certificate, not with the first sale.

Common questions

What is a New York Certificate of Authority?
It is the registration issued by the New York State Department of Taxation and Finance that authorises a business to collect sales tax and to issue and accept most New York exemption certificates.
What is the penalty for selling without a Certificate of Authority in New York?
Tax Bulletin TB-ST-805 sets it at up to $500 for the first day on which sales or purchases are made, plus up to $200 for each subsequent day, not to exceed $10,000. Failing to display a certificate carries a separate $50 penalty.
Does a New York Certificate of Authority expire?
The Department does not publish a routine renewal cycle for a regular certificate; it remains in force until surrendered or revoked. A temporary certificate expires automatically on the end date the applicant specifies.
Do I have to file if I registered but never made a sale?
Publication 750 states that once you receive your Certificate of Authority you are considered to be in business for sales tax purposes even if you never make a sale, and returns are required for each period.

Sources

  1. TB-ST-360, How to Register for New York State Sales Tax — https://www.tax.ny.gov/pubs_and_bulls/tg_bulletins/st/how_to_register_for_nys_sales_tax.htm
  2. Register as a sales tax vendor — https://www.tax.ny.gov/bus/st/register.htm
  3. TB-ST-805, Sales and Use Tax Penalties — https://www.tax.ny.gov/pubs_and_bulls/tg_bulletins/st/sales_and_use_tax_penalties.htm
  4. Form DTF-17-I, instructions — https://www.tax.ny.gov/pdf/current_forms/st/dtf17i.pdf
  5. Publication 750, A Guide to Sales Tax in New York State — https://www.tax.ny.gov/pdf/publications/sales/pub750.pdf