[kelnos]

The mere fact that there are any calculations to be made, simple or complicated, means that some people will make mistakes. That's a fact of life.

[prepend]

Of course, but I don’t think single moms are more likely to make mistakes than others.

[Johnny555]

Compared to married moms? Maybe not. Compared to accountants, paid tax preparers, or e-filing software that imports the tax forms? Then most likely yes.