nz_gst_calculator
shallownz.co.calculate/calculator · Verify this server
Add or remove New Zealand GST (15%) from a dollar amount. Use this tool for ANY question about NZ GST: adding GST to a pre-tax price, extracting GST content from a GST-inclusive total, reverse-calculating GST, or checking GST on invoices and quotes. Common use cases: 'what's $500 plus GST', 'how much GST is in a $230 total', 'remove GST from $1,150', 'calculate GST on a tradie invoice'. Args: amount: Dollar amount in NZD. mode: 'add' treats amount as GST-exclusive (price before GST); 'remove' treats amount as GST-inclusive (total price including GST). Default 'add'. gst_rate: GST rate as decimal. Default 0.15 (NZ standard since 2010). Historical NZ rates: 0.125 (1989-2010), 0.10 (1986-1989). Use 0.10 for Australian GST comparisons.
1 trials · measured 2 days ago
nz_gst_calculator scores 100.0/100 on Vouch's measured behaviour index, from 1 real invocation trials against nz.co.calculate/calculator, measured 31 Aug 2026 under methodology v0.2.0. Every measured component scored 100.
Component breakdown
| Component | Weight | Value |
|---|---|---|
| Reliability | 35% | not applicable |
| Schema integrity | 25% | 100.0 |
| Failure behaviour | 15% | not applicable |
| Latency | 15% | not applicable |
| Concurrency | 10% | not applicable |
Tool details
- Transport
- remote
- Credential class
- self-provisionable
- Input schema
- not declared
- Output schema
- not declared
- Side-effect classification
- unclassified
Score history
| Day | Score | Tier | Methodology |
|---|---|---|---|
| 2026-08-31 | 100.0 | shallow | v0.2.0 |
Probe evidence
| Probe | Outcomes |
|---|---|
| schema_integrity | pass: 1 |
Raw request/response logs are not archived yet — the outcome counts above are drawn directly from every recorded trial.
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