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Background

Here in the UK¹, these are the income tax rules:

• You get a personal allowance (untaxed) of up to £12,570:
  • If you earn less than £100,000, you get the full £12,570 as personal allowance
  • For every £2 over £100,000, your personal allowance goes down by £1
• After the personal allowance, the next £37,700 is taxed at the "basic rate" of 20%
• After that, the next £99,730 is taxed at the "higher rate" of 40%
• Finally, anything above this is taxed at the "additional rate" of 45%

_{1: This isn't actually the case in Scotland; only England, Wales and Northern Ireland.}

Your task

Using the above tax rules, take in an annual salary (as an integer) and calculate the income tax.

Test cases

Input    Output
12570    0
50000    7486
80000    19432
120000   39432
200000   75588.5

Note: the final test case can be any of 75588, 75588.5, or 75589 (any is fine)

Clarifications

• You can choose whether to make the personal allowance an integer or keep it as a float
  • e.g. if the input is £100,003, the personal allowance can be £12,569, £12,568.50, or £12,568
• The same goes for the final output. If it ends up as a float, you can make it an integer or keep it as a float
  • (see the final test case)
• This is code-golf, so shortest answer in bytes wins!

Background

Here in the UK¹, these are the income tax rules:

• You get a personal allowance (untaxed) of up to £12,570:
  • If you earn less than £100,000, you get the full £12,570 as personal allowance
  • For every £2 over £100,000, your personal allowance goes down by £1
• After the personal allowance, the next £37,700 is taxed at the "basic rate" of 20%
• After that, the next £99,730 is taxed at the "higher rate" of 40%
• Finally, anything above this is taxed at the "additional rate" of 45%

_{1: This isn't actually the case in Scotland; only England, Wales and Northern Ireland.}

Your task

Using the above tax rules, take in an annual salary (as a positive integer) and calculate the income tax.

Test cases

Input    Output
12570    0
50000    7486
80000    19432
120000   39432
200000   75588.5

Note: the final test case can be any of 75588, 75588.5, or 75589 (any is fine)

Clarifications

• You can choose whether to make the personal allowance an integer or keep it as a float
  • e.g. if the input is £100,003, the personal allowance can be £12,569, £12,568.50, or £12,568
• The same goes for the final output. If it ends up as a float, you can make it an integer or keep it as a float
  • (see the final test case)
• This is code-golf, so shortest answer in bytes wins!

Background

Here in the UK, these are the income tax rules:

• You get a personal allowance (untaxed) of up to £12,570:
  • If you earn less than £100,000, you get the full £12,570 as personal allowance
  • For every £2 over £100,000, your personal allowance goes down by £1
• After the personal allowance, the next £37,700 is taxed at the "basic rate" of 20%
• After that, the next £99,730 is taxed at the "higher rate" of 40%
• Finally, anything above this is taxed at the "additional rate" of 45%

Your task

Using the above tax rules, take in an annual salary (as an integer) and calculate the income tax.

Test cases

Input    Output
12570    0
50000    7486
80000    19432
120000   39432
200000   75588.5

Note: the final test case can be any of 75588, 75588.5, or 75589 (any is fine)

Clarifications

• You can choose whether to make the personal allowance an integer or keep it as a float
  • e.g. if the input is £100,003, the personal allowance can be £12,569, £12,568.50, or £12,568
• The same goes for the final output. If it ends up as a float, you can make it an integer or keep it as a float
  • (see the final test case)
• This is code-golf, so shortest answer in bytes wins!

Background

Here in the UK¹, these are the income tax rules:

• You get a personal allowance (untaxed) of up to £12,570:
  • If you earn less than £100,000, you get the full £12,570 as personal allowance
  • For every £2 over £100,000, your personal allowance goes down by £1
• After the personal allowance, the next £37,700 is taxed at the "basic rate" of 20%
• After that, the next £99,730 is taxed at the "higher rate" of 40%
• Finally, anything above this is taxed at the "additional rate" of 45%

_{1: This isn't actually the case in Scotland; only England, Wales and Northern Ireland.}

Your task

Using the above tax rules, take in an annual salary (as an integer) and calculate the income tax.

Test cases

Input    Output
12570    0
50000    7486
80000    19432
120000   39432
200000   75588.5

Note: the final test case can be any of 75588, 75588.5, or 75589 (any is fine)

Clarifications

• You can choose whether to make the personal allowance an integer or keep it as a float
  • e.g. if the input is £100,003, the personal allowance can be £12,569, £12,568.50, or £12,568
• The same goes for the final output. If it ends up as a float, you can make it an integer or keep it as a float
  • (see the final test case)
• This is code-golf, so shortest answer in bytes wins!