@DonnaBear65 ,
(a) Which country are you from and when did you enter with H-1B ?
(b) The work that you did for your home-country employer -- was it done here in the USA or while you were physically in your home country ?
(c) What is/was the basis of the dispute ?
What we need to determine is the sourcing country for the delayed payment and hence the questions.
Generally IRS position is that the sourcing of income is where the actual work is performed. There is also the concept of "nexus". And of course some of these categorization may be influenced by any in-effect Tax Treaty between the US and that country.
I will circler back once I hear from you --yes ?