The agency said the surplus was 4.3 billion kronor higher than its latest forecast.
“The deviation is mainly explained by tax revenue being 8 billion kronor higher than calculated. This was largely due to lower tax reimbursements, higher supplementary tax payments, and larger preliminary tax payments on share dividends and interest rate income,” the Debt Office said in a statement.
Interest payments on central government debt were 5.9 billion kronor, which was 0.2 billion kronor higher than expected.
The surplus for the twelve-month period up to the end of May amounted to 100 billion kronor.
Central government debt amounted to 1,048 billion kronor at the end of May.