I am willing to bet that the majority of people in denmark pay income tax and it is about 50% of the gross income i believe.
It is hard to compare just that because all their policy has been different, they have a large percentage of immigrants who settled there, when i was there i met danish whose fathers were from places as different as puerto rico and thailand or sri lanka.
From what i believe, they absorb the immigrants into the working force, giving them benefits but at the same time asking them to contribute equally in return.
Of course, the society is more advanced and people generally don't have the take advantage mentality and that spans throughout their society and reflects in a lot of areas. I am sure that this is not possible overnight, it has to allow for a transition period.
And of course, the numbers are different in terms of immigration than in the US, but the policy was different from the start and this seems to be part of the issue. Non-US people, myself included, tend to see the US in a bit of a controling way. Like that strict mom who does not let you do anything so you can behave and be a good boy but then fails to see the signs of trouble because the child learned how to do things going around his mom, the US government is always quick on the trigger when it comes to prohibit something for the purpose of controling an outcome.
In this case, the solution for the illegals is keep them ilegal, harden the control mechanisms and stick with it no matter what. In the meantime, the illegals forge Social Security Cards, transport drugs across the border, get arrested, and flood the jails, causing more money to be spent because of them on top of the problems with them abusing social care and tax payers dollars. IT is clear that despite all the misery and humiliation they might face, it is still better than being poor in Mexico and they would rather be in the US.
Like the war on drugs, this seems yet another failed endeavour..
Venomous, you could place a man every inch of the border, and they would still come by sea. This is what keeps being forgotten, people will always find a way. Mexicans will invent new ways to smuggle drugs, and new ways to profit from illegal imigration. You can't clamp out a country as you can't expect people to stop using drugs just because they are illegal.
I think a better approach would be to:
1-Lower the requirements for naturalization/legalization (without announcing it to the world to prevent a wave of immigrants all of the sudden)
2-Regulate illegal labour (this means responsabilization of the employers with the risk of fine, business shutdown or jail depending on the case, because, lets face it, usually the problem is on the illegals cause they get deported and the employer just gets another ilegal.)
3-Keep them accountable, legalization is given at the price of proper citizenship, meaning contributing for the tax dollars. And also, and at first, have a three strikes law but at the third strike they are deported and each strike is a failure to pay their taxes.
This is just of the top of my head, and probably some of it is already being done or billed but not enforced properly.
The government works for the 47% who don't pay income taxes.
Correction: the government works for the 1% who funds their elections. The other 52% who pay taxes are just being good americans.