报关单声明函格式如下：
报关单声明函
我司第号商业发票（或第XXXX合同）项下的货物于20年月日报关,并运往（国家或港口名）。货物出口报关单内容明细参见附件所示的出口货物报关单复印件，报关单编号：。
我司保证本声明附件的出口货物报关单复印件的内容均属实且与实际报关和出口内容一致。如出现违反相关法律法规，伪造、篡改等与实际申报事实不符的情况，由此产生的法律责任由我司承担。
DECLARATION
Wecompany,（）, have carried out all necessary customs formalities for the goods under the Commercial Invoice Inv.no: (or Contract No: ) which have been shipped to (name of country or harbor). Please check the attachment for the copy of Customs Declaration Form No:.
We hereby guarantee that all information included in the above-mentioned copy of Customs Declaration Form is inconsistency with which submitted to the customs authority. We will be legally responsible for any claims or demands whatsoever by reasons of any fault, defect, omission or inaccuracy in the content of the above-mentioned copy of Customs Declaration Form.
公司名/Company Name:
（盖中英文公章）:
注意中英文填写必须要完全一致
那么报关单商会需要提供什么资料呢？
报关单无纸化后做商会认证需要提供，一份企业保函，一份报关单声明函，还有一份委托书，加报关单盖章的复印件，文件在贸促会（也就是商会）做成证明书的形式