W8BEN form help

I am expecting to be paid regular commission from a US Company and they require me to supply them with a W8BEN form to prevent me being double taxed - I'm struggling to complete the form esp. Q10 where you need to quote particular article from Tax Treaty with USA and % tax rate Any help appreciated

I've never needed to fill that...See below for the W8BEN instructions at https://www.irs.gov/pub/irs-pdf/iw8ben.pdf

Line 10. Line 10 must be used only if you are claimingtreaty benefits that require that you meet conditions notcovered by the representations you make on line 9 andPart III. This line is generally not applicable to treatybenefits under an interest or dividends (other thandividends subject to a preferential rate based onownership) article of a treaty. Examples of when you mustcomplete line 10 include:• Persons claiming treaty benefits on royalties mustcomplete this line if the treaty contains differentwithholding rates for different types of royalties,• Foreign students and researchers claiming treatybenefits must complete this line. See Scholarship andfellowship grants, later, for more information,• Persons claiming treaty benefits on business profits orgains that are not attributable to a permanentestablishment must complete this line. See Profits orgains not attributable to a permanent establishment, later,for more information.• Persons claiming treaty benefits pursuant to aremittance provision under a treaty must complete thisline. See Remittance claims, later, for more information