@Sam Hopi , agree that most people do use "cash" method for everything -- both incomes and expenses. The best way to maintain this is to file only after your foreign taxes have been filed/ accepted ( i.e. settled) and thus there is no need for an amended return to the IRS.
The nine months is because only nine months of the UK tax year falls in the current US tax year -- does that make sense ?
Is there more I can do for you on this ?
pk
