Imo the best way of doing this is open a thread on this forum to discuss a countries localisation. Such as “Localisation - India”. Manager users with expertise in a particular localisation / jurisdictions accounting / legal requirements can then readily contribute.
I do suspect it would be difficult to make a localisation for the USA as Manager’s tax code architecture does not sensibly accommodate the many tax authorities in USA tax system. Multiple rate tax codes consist of a set of ordinary single rate tax codes would be required.
Edit, actually I would defer to @Tut greater knowledge of Manager customisation and the USA taxation system.