According to Samoan media, lead counsel for the ministers, Alex Su'a, told the court it is the contention of the church that ministers are not taxpayers and therefore should not be paying taxes.
Each minister faces two charges of failure to withhold taxes and failure to file tax returns.
The Commissioner of Inland Revenue, Matafeo Avalisa Viali-Fautuaali'i, was the first witness called by the prosecution.