Fix Mississippi taxable income

[Shinuing]

Fix #4328

[Shinuing]

@PavelMakarchuk when we combined the head and spouse indiv taxable income, it will break the first integration test.
To be specific,

ms_taxable_income_indiv: [21_400, 0, 0] # should be [13_200, 8_200, 0]
ms_income_tax_before_credits_indiv: [800, 0, 0] # should be [390, 158, 0]
ms_files_separately: false #in this case indiv = joint
ms_income_tax: 800

Do we need to separate the combination based on the head/spouse taxable amount (negative or positive)?

[codecov]

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All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4329      +/-   ##
==========================================
- Coverage   99.17%   99.17%   -0.01%     
==========================================
  Files        2418     2410       -8     
  Lines       35015    34883     -132     
  Branches      170      163       -7     
==========================================
- Hits        34725    34594     -131     
+ Misses        260      259       -1     
  Partials       30       30              

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[PavelMakarchuk]

@PavelMakarchuk when we combined the head and spouse indiv taxable income, it will break the first integration test. To be specific,

ms_taxable_income_indiv: [21_400, 0, 0] # should be [13_200, 8_200, 0]
ms_income_tax_before_credits_indiv: [800, 0, 0] # should be [390, 158, 0]
ms_files_separately: false #in this case indiv = joint
ms_income_tax: 800

Do we need to separate the combination based on the head/spouse taxable amount (negative or positive)?

I think, based on the tax form, that we should separate everything until the tax before non refundable credits - after it should all be combined

[Shinuing]

@PavelMakarchuk

1. I hard coded for the ms_taxable_income_joint to simplify the code structure. Let me know if that make sense
2. Still some difference of the ms_income_tax compared to TAXSIM. I've attach the calculation and let me know if we still miss anything.

[PavelMakarchuk]

@PavelMakarchuk

1. I hard coded for the ms_taxable_income_joint to simplify the code structure. Let me know if that make sense
2. Still some difference of the ms_income_tax compared to TAXSIM. I've attach the calculation and let me know if we still miss anything.

Is it obvious what TAXSIM is doing different from PE - do we align on the taxable income amounts?

[martinholmer]

@PavelMakarchuk, When is PR #4329 going to be merged?