Good plan, since I just eyeballed it. Let's do the actual math. Here's the distribution:
https://www2.census.gov/programs-surveys/cps/tables/hinc-06/2018/hinc06.xls
The first $60k for the couple would be tax free (federal income tax wise).
OK. So, if the first $60k is tax free, then about 49% of households will pay no federal taxes (not just no federal income taxes). All the households earning less than $250k (95.6% of all the households) would, combined, pay $721.5 billion. That works out to a tax rate of about 10.5%, average. So, the problem isn't what I thought it was: that it would be a tax hike for some people in that group. Rather, the problem is that it would devastate revenues.
Canada, Australia, the UK, Germany, France, Italy, Japan, etc.
First, no, you don't just take out the cap.
Why not? It's a simple and elegant fix, which is akin to what we already did with Medicare.
Why tax those under $500k more?
Because there aren't all that many people over $500k, so if you're looking to collect enough to keep in solvent, you really want people paying in between the current tax cap and $500k, which is a whole lot more people.
Second, no, you don't tax other income sources.
Why not?
SS is based on earned income.
It could be based on unearned income, too.
First, mine is a two tier bracket, not completely flat.
Technically, it's a three-tier bracket, in that it's 0% up to a level, then 20%, then an extra 10%. But the devil's in the details. By taking out most of the brackets, you've made it a clumsier instrument, which will make it hard to achieve decent revenue numbers without either soaking the poor, or creating a brutal cliff where suddenly you cross a particular threshold and tax rates are vastly higher. Why not go with a smoother change, rather than a fairly arbitrary sharp change at one particular dollar figure (or rather two). For example, if it makes sense for a couple that earns $70,000 to pay a bit more than one that earns $60,000, then why doesn't it make sense for a couple that earns $60,000 to pay a bit more than one that earns $50,000? And if it makes sense for the effective rate to be higher on someone who earns $550,000 than someone who earns $500,000, then why doesn't it make sense for the effective rate on someone who earns $500,000 to be that much higher than on someone who earns $450,000 (rather than both paying the same 20% on all income over the standard deduction). I'd rather have a consistent approach where the effective rate rises fairly smoothly from zero to a theoretical maximum of 100% at infinity, as you go up in income.
Which is why I stated to eliminate them all. I think on this we agree, other than perhaps the number of brackets.
Agreed. I just don't think the brackets are the source of much complexity. Even with the much more extensive bracketing systems of the 1950s and 1960s, you could easily print the whole thing on a postcard. And with tax software, you can calculate your tax pretty much the same speed whether you have one bracket or a million. So, I don't see value in removing brackets.