Created
January 1, 2024 11:09
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Tax calculator
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Tax Calculator</title> | |
| <script type="module" src="tax-calculator.js"></script> | |
| <script type="module" src="main.js"></script> | |
| </head> | |
| <body> | |
| <div> | |
| <label for="income">Revenus (gross)</label><input type="number" min="0" id="income"> | |
| </div> | |
| <div> | |
| <div>Montant de la taxe:<span id="tax-amount"></span></div> | |
| <div>Taxe effective:<span id="tax-effective"></span></div> | |
| </div> | |
| </body> | |
| </html> |
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| import {calculateTax} from "./tax-calculator.js"; | |
| const income=document.querySelector('#income'); | |
| const taxAmount=document.querySelector('#tax-amount'); | |
| const taxEffective=document.querySelector('#tax-effective'); | |
| income.addEventListener('change',()=>{ | |
| let tax=calculateTax(+income.value||0,[ | |
| {upperBound:11294,taxPercent:0}, | |
| {upperBound:28797,taxPercent:11}, | |
| {upperBound:78570,taxPercent:30}, | |
| {upperBound:177106,taxPercent:41}, | |
| {upperBound:Infinity,taxPercent:45}, | |
| ],0); | |
| taxAmount.innerText=tax+'€'; | |
| if(income.value===0){ | |
| taxEffective.innerText=0+'%'; | |
| }else{ | |
| taxEffective.innerText=tax/income.value*100+'%'; | |
| } | |
| }); |
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| /** | |
| * | |
| * @param amountToTax {number} | |
| * @param brackets {Array[{upperBound:number,taxPercent:number}]} Upper bound of each bracket. | |
| * @param exoneratedAmount {number} | |
| * @return {number} | |
| */ | |
| export function calculateTax(amountToTax, brackets, exoneratedAmount) { | |
| const realTaxableAmount=amountToTax-exoneratedAmount; | |
| if(realTaxableAmount<=0){ | |
| return 0; | |
| } | |
| let previousUpperBound=0; | |
| let taxAmount=0; | |
| for(let {upperBound,taxPercent} of brackets){ | |
| if(realTaxableAmount<upperBound){ | |
| taxAmount+= (realTaxableAmount-previousUpperBound)*taxPercent/100; | |
| break; | |
| }else{ | |
| taxAmount+= (upperBound-previousUpperBound)*taxPercent/100; | |
| } | |
| previousUpperBound=upperBound; | |
| } | |
| return taxAmount; | |
| } |
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