The rosy annual profit underscores the recovery among Japan's major automakers after the 2011 quake-tsunami disaster devastated sales and production, and highlights strong demand in the key Asian and US markets.
The yen, which has lost about one-fifth of its value on the dollar since November, has also helped, boosting Japanese firms' competitiveness overseas and jacking up the value of their repatriated foreign income.
The declining yen was among the factors cited by Toyota for its profit jump, after rival domestic automaker Honda said its net profit for the year to March soared 73.6 per cent thanks to robust overseas sales, a weaker yen, and cost cutting.
The firm, which last year overtook General Motors to regain the title of world's biggest automaker, also said it expected to earn a net profit of 1.37 trillion yen for the fiscal year ending March 2014.
"We experienced increased sales of our vehicles mainly in North America and Asia," Toyota President Akio Toyoda said, also pointing to "company-wide profit improvement activities".
Global vehicle sales hit 8.87 million units in the year to March, Toyota said, despite nearly flat results from recession-riddled Europe.
The Camry and Corolla maker added that vehicle sales in the current fiscal year were on track to hit 9.1 million units.
However Japan's three biggest automakers -- Toyota, Nissan and Honda -- have seen results dented by the fallout from a bitter territorial row between Tokyo and Beijing that fuelled a consumer boycott of Japanese products.
Toyota did not make specific reference to the spat in its earnings statement today, but has previously said it would take a hit from the diplomatic battle.
