Can anyone help with this?
Normally, you won’t pay anything unless the goods value exceeds $1000.
The amount of duty you have to pay when exporting from the UK to Amazon FBA USA depends on a number of factors, including the type of product you are exporting, its value, and the quantity you are exporting.
In general, however, the US import duty rate on most goods is between 2% and 10%. For example, the duty rate on electronics is 3.4%, while the duty rate on clothing is 9%.
To calculate the amount of duty you owe, you will need to know the Harmonized Tariff Schedule (HTS) code for the product you are exporting. The HTS code is a 10-digit number that is used to classify goods for import and export purposes. You can find the HTS code for your product on the US Customs and Border Protection (CBP) website.
Once you have the HTS code, you can use the CBP duty calculator to estimate the amount of duty you owe.
In addition to duty, you may also be required to pay other taxes and fees when importing goods into the US, such as the Harbor Maintenance Tax (HMT) and the Merchandise Processing Fee (MPF).