even steven

Hello.. a little background.  My wife and I live in Louisiana, we are both retired.  She has a pension from the local school board but does not get social security.  I get Social Security, but no pension.  So basically our income has remained almost the same for the past several years.  No stocks or bond sales for several years and we live in the same house we've been in for decades.  So my question is this:  The last two years ( including this year ) when I have done our state income taxes, I have ended up owing nothing but not getting a refund either.  This has happened for 2 consecutive years.  Does this sound normal or am I doing something wrong in my calculations?