nz_pro_rata_salary_calculator

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Scale a full-time New Zealand salary to part-time hours, gross and net. Use for: 'what would $90,000 be for 3 days a week', 'pro rata salary for 25 hours', 'I am dropping to four days, what will I earn', 'is part time worth it after tax'. THE USEFUL PART IS THE TAKE-HOME, NOT THE GROSS. The gross scales with the hours; the take-home does not, because dropping hours drops the salary out of the higher brackets. Someone going from five days to three often keeps more than 60% of their take-home, and that is what the decision turns on. Lead with it. The Independent Earner Tax Credit defaults on, because part-time earnings are the band where it is worth the most. Turn it off for someone on a main benefit, Working for Families or NZ Super. Args: full_time_salary: The advertised full-time annual salary. full_time_hours: Hours a week full time is based on, usually 40. your_hours: Hours a week actually worked. kiwisaver_rate: A DECIMAL, 0.035 for 3.5%. has_student_loan: Whether repayments are deducted. claim_ietc: Whether the Independent Earner Tax Credit applies. Returns: The pro rata salary gross by year, month, fortnight and week, the implied hourly rate, and the take-home after tax.