The figure is equivalent to 8.7% of the target for 2018.
Official data showed that domestic revenues reached VND95.5 trillion (US$4.2 billion), down 1.4% from a year earlier.
Revenues from crude oil were estimated at VND4.1 trillion (US$180.4 million), up 48.6% against January 2017, thanks to higher oil prices, which have risen by an average of US$7.4 a barrel.
According to the MOF, revenues from export-import activities reached VND14.5 trillion (US$638 million) after value added tax had been refunded.
In January, total government spending was estimated at VND91.5 trillion (US$4 billion), with 80% going to regular spending on socio-economic development and welfare benefits.