Staff from the government's Online Support Centre at Douglas Sea Terminal will be moved to help the Vehicle Test Centre next week.
On Facebook, the government says high demand for services such as car tax at the Braddan facility means workers will be redeployed.
One in four people are going to the test centre rather than using the website after the services were moved online last month.
In its post the government says the decision to close the Sea Terminal office from Monday, May 11 was made after assessing footfall, demand, and feedback.
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