Foxconn, formally known as Hon Hai Precision Industry Co Ltd, said in a stock exchange filing that revenue fell 8.3 percent to T$619.3 billion ($20.12 billion) in December.
It is its first year-on-year monthly revenue dip since February.
The revenue performance for December compared to consolidated revenue of T$675.1 billion in December last year, which then represented a 50 percent year-on-year rise.
Foxconn said 2018 sales increased 12.5 percent compared to 2017.
Warning signs about the health of the electronics sector have lingered in recent weeks, with Apple Inc cutting its first quarter revenue forecast and attributing its iPhone revenue shortfall primarily to Greater China.
($1 = 30.7800 Taiwan dollars)
(Reporting by Chyen Yee Lee and Jess Macy Yu; editing by David Evans)
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