Have we ever had a Portuguese Government Budget with surplus instead of a deficit?

The answer is YES!

Looking at the XX and XXI centuries and considering effective expenditure excluding public debt amortization, the Portuguese Government Budget had a surplus (more revenue than expenditure) instead of a deficit in the following 20 years:

1901; 1905
1911; 1913; 1914
1929;
1930; 1931; 1932; 1934; 1935; 1936; 1937
1942
1951; 1952; 1953; 1957; 1958
1970