According to this unbiased website, there were 760,000 abortions in 1996 in the United States. That represents only those that were recorded, so only those performed legally. And it was 11 years ago, so there could be more today.
Abortion Statistics - By Age.
So let's assume there are 1,000,000 abortions in the US and do a little math here. Let's say every single one of them required welfare and Medicaid each year, a ridiculous assumption, but let's go with it. Let's assume welfare provides about $10,000 in benefits each year, and Medicaid provides on average about $3000 in benefits. That amounts to $13 billion needed to cover them.
Now, there are about 300 million people living in the US. When you take out those under 18, those over 65 receiving social security, and those without jobs, you're left with something like 150,000,000 taxpaying citizens.
So divide $13 billion by those taxpayers, and you're talking $86 per taxpayer per year. That's $7.22 a month, or $1.67 per week. Hardly a consequential amount of money.
And that's based on the ridiculous notion that every single baby currently being aborted would become complete drains on society.
The taxes are not an issue.