Also, it is important for us if you can transfer the ADVANCE money on the personal accounts which we gave you earlier
These are apparently fake bank accounts used for the purpose of transfering money and hiding both it's origin and purpose.
and the sum for one occasion transfer (for example, during one day) will not be more than 10,000 USD.
Any transfer of money in excess of $10,000 in a 24 hour period must be reported to various agencies of the government. When you intentionally transfer more than $10,000 in increments smaller than $10,000 this shows an intention to bypass money laundering laws. This in and of itself is a federal crime called structuring.*
Only in this case we can avoid big taxes and use money for our work as much as possible.
Here their motive for laundering the money is clear. This appears to be a deliberate tax evasion scheme.
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*Title 31 of the United States Code, section 5324, provides (in part):
No person shall, for the purpose of evading the reporting requirements of section 5313 (a) or 5325 or any regulation prescribed under any such section, the reporting or record keeping requirements imposed by any order issued under section 5326, or the record keeping requirements imposed by any regulation prescribed under section 21 of the Federal Deposit Insurance Act or section 123 of Public Law 91–508— [...] (3) structure or assist in structuring, or attempt to structure or assist in structuring, any transaction with one or more domestic financial institutions.
Section 5324 further provides that a violation of this provision may be punished by a fine or up to five years in prison, or both.[4]