Do You Hear The
People Sing
Do you hear
the people sing?
Singing the song of angry men?
It is the music of the people
Who will not be slaves again!
When the beating of your heart
Echoes the beating of the drums
There is a life about to start
When tomorrow comes
Fool me once shame
on me. Fool me twice shame on you.
In an ideal world, the income tax debate would go like
this. What is the lowest acceptable income tax rate. The Bible might call this a tithe,
10%. If that is the lowest rate, then according to the laws of normal distributions,
the mode/mean/median rate should be 20%, and the highest rate should be 40%.
The Tax Cut and Jobs Act, TCJA, sets the lowest tax rate at 10% and the highest
tax rate at 37%, which is not exactly normal, but is arguably close enough. It also
confuses marginal tax rates and effective tax rates, but that will be discussed later.
The question is how to transition from a rate of 10% to a rate
of 37% in a fair manner. One suggestion might be to pick an arbitrary amount
and transition at that income. However establishing that transition income would be contentious
politically, but mathematically it should be such that the median tax rate is paid by the median income. Since it is a tax on income, not a tax on individuals, if income is not normally
distributed among individuals, then arguably the transition should follow the distribution of
income not people. The distribution of income is not normal (a statistical term, not an ethical
term). If incomes were distributed normally, then the mean would be equal to
the median would be equal to the mode, the most common value. According to the
US Census for income, the mean is definitely not the median. One of the most
common non-normal distributions is the exponential distribution. Without debating
why incomes are not normally distributed, the transition from the lowest tax rate to
the highest tax rate should arguably follow this existing distribution of income.
(Interestingly, a flat tax also implies that everyone has the same income. To
be mathematically consistent, those that argue for a flat tax must also be also
communists who argue that every individual should have the same income.)
Any non-linear distribution can be approximated by a series of straight lines of EQUAL intervals, which is how calculus works. There are seven brackets in the TCJA. Assuming that the top bracket is the full amount, and the first bracket is the lowest amount, then there are five brackets in which to make the transition (e.g. the total tax paid in the highest income in the sixth of seven brackets should have an effective rate of 37%, the highest rate). The effective tax rate at any income x is 10% + 27%*(1-e-λx), where 1/λ is the mean income according to the exponential distribution. This can be approximated by a series of straight lines, tax brackets, as:
a=λ*10%= 10% λ
b=λ*(10% + (1-e-.2)) = 28.1% λ
c=λ*(10% + (1-e-.2) + (1- e-.4)) = 61.1% λ
d=λ*(10% + (1-e-.2) + (1-e-.4) + (1-e-.6)) = 106.2% λ
e=λ*(10% + (1-e-.2) + (1-e-.4) + (1-e-.6) + (1-e-.8)) = 161.3% λ
f= λ*(10% + (1-e-.2) + (1-e-.4) + (1-e-.6) + (1-e-.8) + (1-e-.1) )
Bracket |
Lower income |
Upper Income |
Fixed Tax |
Marginal
Tax Rate |
Lowest Effective Tax |
Highest Effective Tax |
1 |
$0 |
$102,316 |
$0 |
10% |
10% |
10% |
2 |
$102,316 |
$204,632 |
$10,232
|
18.13% |
10% |
14% |
3 |
$204,632 |
$306,948 |
$28,751
|
32.97% |
14% |
20% |
4 |
$306,948 |
$409,264 |
$62,515
|
45.12% |
20% |
27% |
5 |
$409,264 |
$511,580 |
$108,660
|
55.07% |
27% |
32% |
6 |
$511,580 |
$613,896 |
$165,036 |
63.21% |
32% |
37% |
7 |
$613,896 |
No
Limit |
|
37% |
37% |
37% |
The 2022 TCJA Tax rates for Married Filing Jointly or Qualifying Widow (Widower) are:
Bracket |
Lower
income |
Upper
Income |
Fixed
Tax |
Marginal Tax Rate |
Lowest
Effective Tax |
Highest
Effective Tax |
1 |
$0 |
$20,550 |
$0 |
10% |
10% |
10.0% |
2 |
$20,550 |
$83,550 |
$2,055 |
12% |
10% |
11.5% |
3 |
$83,550 |
$178,150 |
$9,615 |
22% |
11.5% |
17.1% |
4 |
$178,150 |
$340,100 |
$2,055 |
24% |
17.1% |
20.4% |
5 |
$340,100 |
$431,900 |
$9,615 |
32% |
20.4% |
22.8% |
6 |
$431,900 |
$647,850
|
$2,055 |
35% |
22.8% |
26.9% |
7 |
$647,850 |
No Limit |
$9,615 |
37% |
26.9% |
35.7%* |