Accounts Payable: Vendor Claims

Vendor Hotline: 516-571-3241

Resources for Nonprofits

Fiscal Officer Gabriel Marques
Nassau County Comptroller’s Office
Vendor Claims Department
240 Old Country Road
Mineola, NY 11501



Email Vendor Claims

For nonprofit vendors: Quick Reference Guide to Supporting Documentation

How do I update my vendor payment information?
(e.g. contact information, address, bank account number)

You will need to complete a Request for Taxpayer Identification Number and Certification (Form 700-W9).

Please contact the Department with whom you have a contract, or email

Vendors are required to fill out this form in order to contract with and receive payment from the County. 

If you are checking on the status of a claim:
Have your Nassau County voucher number ready. (Starts with a "V", e.g. VDPW18000001)

For information on Executive Order 2 - 2018 (Gift Policy):

Claim vouchers/invoices should be mailed to the Nassau County department that has received the goods or services:

 *Note: If you wish to use your own invoice/voucher, the ‘Claimant’s Certification’ disclosure statement printed below must be copied to your form. Your signature is required.

I hereby certify that this claim voucher is just, true, and correct; that the amount claimed is actually due and owing and has not been previously claimed; that no taxes from which the County is exempt are included; and that any amounts claimed for disbursements have actually and necessarily been made. I further certify that all items and/or services were delivered or rendered as set forth in this claim, and for all items and/or services delivered or rendered in accordance with a purchase order or contract that the prices charged are in accordance with the reference purchase order or contract. For all claims made as reimbursement for employee expenses, I further certify that the amounts set forth were actually and necessarily expended for the benefit of Nassau County, and that the monies expended have not been reimbursed nor do I expect to be reimbursed from any source.