This is going to be a long post. A very long post. However, I promise you it's worth the read. Sources are at the bottom. No TL;DR, because you don't belong here if you're that low energy.
Most Americans underestimate how much illegal aliens cost us each year. Looking at the Heritage Foundation study, you will find that the average illegal household pays about $10,334 annually in taxes. The disparity lies in the fact that the average illegal household receives around $24,721 in government benefits (this includes direct benefits, means-tested benefits, education benefits, population-based services, interest and other spending, and pure public goods expenditures) annually. For comparison, the average households with college-educated heads received $24,839 in government benefits while paying $54,089 in taxes. Now, looking at these figures, we can conclude that the average household of illegals costs taxpayers $14,387 per annum. The Heritage Foundation estimates that there are 3,444,955 households of illegals in the US, containing “no more than” 12,708,875 illegal immigrants. This estimate is flawed, however, because it is based off of a census study conducted in the year 2001. It’s strange how immigrants flood into our country and hop the border in droves, yet the amount of illegal immigrants has stayed roughly the same… A more apt estimate would be the one conducted by Ann Coulter in her book Adios, America! in which she cites a study by Pulitzer Prize-winning journalists Barlett and Steele that estimates an average of 3 million illegal aliens are coming in yearly–enough to fill 22,000 Boeing 737-700 airliners. Coulter also cites a study Fred Elbel done in 2007 that estimates there were 20 million illegal immigrants residing in the US in 2005.
Taking these new figures, we can calculate that there are close to 50 million illegal immigrants currently in the US. However, since I understand these studies are just estimates; I will use a more conservative estimate of 35 million. This new number of illegals is close to 3.5x the Heritage Foundation’s estimate, so we arrive at 12,057,343 households of illegals. AII of these households are costing US taxpayers $14,387 per annum. Multiply these two numbers and you get the cost of illegal immigration to the US: $173,468,986,547.
The US Customs and Border Protection (CBP) contractor, the US Army Corps of Engineers (USACE) completed 651 of nearly 652 miles of fencing mandated by Congress in 2005, which was a part of the DHS’ Secure Border Initiative (SBI). The price per mile (PPM) ranged from $400,000 to $15.1 million, for an average of $3.9 million PPM. The USA has close to 2,000 miles bordering Mexico and other areas illegal aliens typically trek though. Assuming the best option is the option for $15 million PPM, it would cost taxpayers around $30 billion to build a comprehensive wall. The price to build a wall that would last a lifetime is less than 17% of the yearly cost of illegal immigration. The choice is extremely clear.