The official said the government hopes to raise two billion rupees from the new charge.
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The tax was earlier set at 2.5 percent.
The government dropped a 50 rupee monthly tax which would have hit poor users the hardest at the last minute on the intervention of telecom minister Rauf Hakeem earlier this month.
Sri Lanka government has been looking to raise cash to bridge an expanding budget deficit that is crippling economic activity.
It is juggling with a bloated public sector that gets tax free salaries and pensions, duty slashed cars as well as an ever increasing subsidy bill that is kept in place to buy popularity.
In the first five months of the year, 57 cents out of every tax rupee collected went pay the salaries and pensions of state workers.
However analysts say the decision to increase taxes - even for unproductive expenditure - is a better move th