Married taxation - a quick query

Hi all, got married last year and we never bothered going to the revenue to inform them of our big day.
This evening, out of curiosity, I checked out some of the online calculators. And while all gave me back varying figures, all indicated that we would be far better off being classed as married.

For example, on the PWC calculator, If I put in my salary of 35k as a single person my monthly disposable is €2328 while If I put it in as married it shoots up to €2793. My wife is on €30k and would also see a big increase in her monthly disposable. Surely I'm missing something here? Is this all too good to be true?
Would appreciate any thoughts or comments, and yes I am clueless.

i think if you put down that you are married, the calculator assumes you have put in both salaries i.e. €65K - I am not an expert, but i do think at those amounts, you would be better off jointly assessed

ETA: [broken link removed]
"for the category of married couple with two earners, for the purposes of the calculation, the figures input should be the combined income of both spouses. The calculation will assume that both incomes are split evenly. The results shown as the "net of tax position" is the combined disposable income"

When you used the calculator, did you put in your salary as the only salary and your wife as having no salary and say that you are married.
If so, it will assume that she is transferring all tax possible tax credits to you.
This is not true as she uses her tax credits and tax bands.

The only valid way of using the calculator is to put both salaries in at the same time and see what the joint position is, compared to both being assessed as single.