python用函数计算个人所得税

在Python中，我们可以编写一个函数来计算个人所得税，这通常涉及到中国的累进税率制度。以下是一个简化版的示例，假设有基本减除费用（比如5000元）以及几个税率等级：

def calculate_tax(income):
    basic_deduction = 5000  # 基本减除费用
    tax_rates = [
        (0, 0),  # 税率区间和起征点
        (30000, 0.03),
        (120000, 0.1),
        (250000, 0.2),
        (350000, 0.25),
        (550000, 0.3),
        (无穷大, 0.45)  # 高端税率
    ]

    income_after_deduction = income - basic_deduction
    for rate_threshold, rate in tax_rates[:-1]:  # 不包括最后一个无限大的税率
        if income_after_deduction > rate_threshold:
            taxable_income = income_after_deduction - rate_threshold
            tax = taxable_income * rate
            income_after_deduction -= taxable_income
            break

    final_tax = income_after_deduction * tax_rates[-1][1] if income_after_deduction > 0 else 0

    return tax + final_tax

# 示例使用
income = float(input("请输入您的年收入："))
tax = calculate_tax(income)
print(f"您需要缴纳的个人所得税为：{tax}元")