You may check CBP web site for detail.
M]}l^m>L 2Y400 http://www.cbp.gov ;wJ~ha C K K?Zm_ The following is mentioned in U.S. Customs and Border Protection Declaration Form
T}C2e! _O :w@F?:C Money And Other Monetary
*_`76`cz%X Instruments
OnZF6yfN=3 You may bring into or take out of the country, including
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$ by mail, as much money as you wish. However, if
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@zz"~f7 it is more than $10,000, you will need to report it to
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CBP. Ask the CBP officer for the Currency Reporting
QL2Nz@|k Form (FinCen 105). The penalties for non-compliance
,Pn-ZF can be severe.
;W]D ~X& “Money” means monetary instruments and includes U.S.
8 RVS)D'' or foreign coins currently in circulation, currency, travelers’
z0#-)AeS checks in any form, money orders, and negotiable
=EQJqj1T instruments or investment securities in bearer form.