Mateusz Gruszczyński
37 lines
1.4 KiB
Python
37 lines
1.4 KiB
Python
from decimal import Decimal, ROUND_HALF_UP
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def money(value):
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return Decimal(str(value)).quantize(Decimal("0.01"), rounding=ROUND_HALF_UP)
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def calculate_costs(gross, vat_rate=23, vat_deduction_percent=50):
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gross = Decimal(str(gross)); rate = Decimal(str(vat_rate))
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deduction = Decimal(str(vat_deduction_percent)) / Decimal("100")
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net = gross / (Decimal("1") + rate / Decimal("100")); vat = gross - net
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deductible_vat = vat * deduction
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return {"gross": money(gross), "net": money(net), "vat": money(vat),
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"deductible_vat": money(deductible_vat), "final_cost": money(gross - deductible_vat)}
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def calculate_net_price_costs(net_price, vat_rate=23, vat_deduction_percent=50):
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"""Return per-unit invoice and effective costs for a net fuel price.
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A 50% VAT deduction means the company bears half of the VAT, not a 50% VAT rate.
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"""
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net = Decimal(str(net_price))
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rate = Decimal(str(vat_rate)) / Decimal("100")
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deduction = Decimal(str(vat_deduction_percent)) / Decimal("100")
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deduction = min(max(deduction, Decimal("0")), Decimal("1"))
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vat = net * rate
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invoice_gross = net + vat
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deductible_vat = vat * deduction
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effective_cost = invoice_gross - deductible_vat
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return {
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"net": net,
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"vat": vat,
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"invoice_gross": invoice_gross,
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"deductible_vat": deductible_vat,
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"effective_cost": effective_cost,
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}
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