nz_tax_code_calculator

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Pick the correct New Zealand tax code for an IR330, and explain why. Use for: 'what tax code should I use', 'M or ME tax code', 'secondary tax code NZ', 'SB S SH ST SA which one', 'tax code for second job', 'am I on the wrong tax code'. THE WRONG CODE IS ONE OF THE FEW PAYROLL MISTAKES THAT COSTS MONEY QUIETLY ALL YEAR, and there are two ways to get it wrong. A SECONDARY CODE IS CHOSEN ON TOTAL INCOME ACROSS ALL JOBS, NOT ON WHAT THE SECOND JOB PAYS. Someone earning $60,000 in a main job and $8,000 in a second is SH, not SB. Choosing on the smaller figure under-taxes and produces a bill at year end. ALWAYS ASK FOR TOTAL INCOME before answering a secondary code question. If total_income_all_jobs is omitted this falls back to this job's income and returns a warning saying the band is very likely wrong; pass that warning on rather than reporting the code as settled. ME IS NOT SIMPLY "M PLUS A CREDIT". The Independent Earner Tax Credit, worth up to $520 a year, is withdrawn by receiving Working for Families, a main benefit or NZ Super, so someone inside the $24,000 to $70,000 band can still correctly be an M. Add SL when a student loan is being repaid. On a SECONDARY job the repayment is 12% of the gross with no threshold at all, because the repayment threshold belongs to the main job. That catches people who expect the threshold twice. Special tax codes, non-resident status and multiple secondary jobs are out of scope here; those need Inland Revenue. Args: annual_income: Income from THIS job, before tax. job_type: primary for the main job, secondary for any other. total_income_all_jobs: Total across every job. Needed for secondary. has_student_loan: Whether a student loan is being repaid. receives_wff_benefit_or_super: Working for Families, a main benefit or NZ Super. Any of these removes IETC eligibility. Returns: The code, what it means, why it applies rather than the alternative, the flat rate for a secondary code, and any warning about the inputs.