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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.

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