The company, which charges households annual interest rates of more than 5800%, said profits after tax rose by 36% to £62.5 million.
Lending was up 68% in the year to £1.2 billion, while customer numbers ballooned 61% to more than a million amid the ongoing squeeze on household finances and banks' retreat from riskier lending.
The online lender was engulfed in a storm of controversy recently when the Archbishop of Canterbury said he wanted the Church of England to "compete" it out of existence by backing credit unions.
Wonga typically lends sums of about £200 to £400 to consumers, repaid over a few weeks. It has also started offering loans of up to £30,000 to credit-starved small businesses, repayable over a year.
The company came under fire for boosting profits at the expense of struggling consumers.
Gillian Guy, chief executive of charity Citizens Advice, said: "The payday loans industry must focus on boosting customer welfare, rather than boosting profits at the expense of hard-pressed householders who struggle to pay back unaffordable loans."
But founder and chief executive Errol Damelin insisted the online lender operates in an "upfront and transparent" way, adding it rejects two-thirds of applications.
Wonga said it earns an average profit of £15 per loan, or 5p of profit on every £1 it lends. It did not pay a dividend but reinvested profits back into its development.