By Fanny Liu

TAIPEI--Taiwan predicts steady growth next year on strong demand in its semiconductor export markets, as falling oil prices keeps inflation in check and is likely to defer a rise in interest rates.

Gross domestic product is forecast to rise 3.50% next year, the strongest rate since 2012, the Directorate General of Budget, Accounting and Statistics said Friday. The agency expects GDP to rise 3.43% this year, picking up from growth of 2.23% last year.

The agency said global demand for Taiwanese-made processors will remain strong next year as they wind up in new iPhones and other gadgets, and given the global rollout of the fourth-generation mobile network. The agency expects Taiwan to ship 3.56% more goods and services abroad in 2015, up from an estimated 3.01% increase for this year. Corporate investments will also grow at a much faster rate of 5.59% next year, compared with an estimated 4.10% for this year.

Orders for Taiwanese components from tech titans including Apple Inc. (AAPL) and Microsoft Inc. (MSFT) have hit new highs for the past two months. Taiwanese-owned factories onshore and in China are key assemblers and suppliers of components to new iPhones, which have seen strong demand from consumers since the device's September launch.

Growing exports are also creating new jobs and raising wages. Private consumption will likely grow 2.76% this year and 2.74% in 2015, the agency said.

While demand from the U.S. and China has improved, a cooling Chinese economy remains the biggest risk to Taiwan's exports next year, as the cross-strait trading partner is Taiwan's biggest export market, Standard Chartered economist Tony Phoo said.

Other headwinds are also emerging for the island's export-driven economy. The agency said falling energy prices will diminish the value of petrochemical exports, while Taiwan's handsets and computers will likely continue to bleed market share to competitors from China and South Korea.

"As long as local manufacturers continue to relocate their production facilities to China and ASEAN rather than returning to Taiwan, the improved global demand will unlikely translate to actual growth in [Taiwan's] headline exports and help contribute to GDP growth," Bank of America Merrill Lynch Global Research said in a report.

About half of Taiwan's output is produced outside of the island.

The agency trimmed its inflation estimate to 1.18% for this year because of lower oil prices, which continued to plummet Friday after the Organization of Petroleum Exporting Countries left its output target unchanged. The inflation estimate compares with its previous forecast of 1.64%, and the central bank's tolerance of 2%. The agency also said consumer prices will likely rise just 0.91% next year. Analysts said modest inflationary pressure, which is further suppressed by the decline in oil prices, continues to provide room for the central bank to refrain from raising interest rates.

Write to Fanny Liu at fanny.liu@wsj.com

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