计算方法
我们如何计算每项限额、在银行不公布其做法之处我们所作的选择、我们的假设,以及每项引擎测试及其结果。
公布利率截至 2026年11月10日。测试利率确认于 2026年7月13日。规则核查于 2026年11月10日。
方法,以及我们选择它们的原因
答案
我们计算三项限额并取最低者:还款能力、债务收入比限额和首付 (LVR) 限额。结果会说明哪一项起决定作用以及原因。由银行决定;这只是估算。
还款能力
每月剩余金额 = 税后收入 + 计入的租金部分 − 生活费 − 其他债务还款 − 任何缓冲金。可支持的贷款为年金的现值:贷款 = 余额 × (1 − (1 + r)^−n) / r,其中 r 为测试利率除以 12,n = 360 个月。该公式来自我们还款网站所用的共享引擎。
测试利率
各银行公布的测试利率,由 interest.co.nz 和 MPA 于 2026 年 7 月确认。我们默认使用五家银行的平均值(6.94%),以免偏向任何一家银行,并按字母顺序显示每家银行。30 年测试期限仅来自二手资料。
生活费:我们的假设
银行把您的生活费与其不公布的内部基准进行比较。我们取您的金额与我们自己的下限中较高者:第一位成年人每月 $1,600,其他每位成年人 $800,每位受抚养子女 $500。这些是我们的假设,不是银行的数字。您可以关闭下限。
DTI 限额
税前收入(包括全部租金)× 6(自住业主)或 × 7(投资者),减去现有债务,包括信用卡和透支的全部额度。正好为 6 属于限额之内;高于 6 则为偏高。
首付 (LVR) 限额
贷款 = 首付 × LVR / (1 − LVR):自住业主为 80%,投资者为 70%,First Home Loan 为 95%,低首付贷款或新建房屋则为您选择的比例。正好为 80% 属于规则之内;高于 80% 则为偏高。
豁免
First Home Loan 可豁免 LVR 限制,据二手资料也可豁免 DTI;新建房屋两者均可豁免。我们把获豁免的限额显示为豁免。我们无法在 rbnz.govt.nz 上确认目前的措辞。
租金
按照 Kiwibank 的说明,评估还款能力时我们计入 75% 的租金(两个来源称为 70% 至 80%),计算 DTI 时则把全部租金计为收入。
房价范围
按各银行测试利率计算的贷款加首付,从最严格到最宽松。还款额按五家银行公布的 1 年期利率平均值计算,与我们还款网站使用同一张注明日期的利率表,并向上取整到分。
我们未计入的项目
税款:您输入的是税后收入。信用卡额度:计入 DTI,但不作为每月费用,因为银行不公布其所用的比例。购房费用从您输入的首付中扣除。
利率从何而来
银行测试利率来自 interest.co.nz,确认于 2026年7月13日。公布利率来自与我们还款网站相同的每周利率表,日期为 2026年11月10日。本网站上的利率总是附有日期。
引擎测试
我们研究文件中的每个借款案例(HL-01 至 HL-14)以及我们的引擎检查,都会在每次构建前运行,任何失败都会使构建停止。于 2026年11月10日:58 项通过,0 项失败。
| 检查项 | 依据 | 结果 | 详情 | 来源 |
|---|---|---|---|---|
| HL-01 DTI ratio | sourced | 通过 | expected 6.25, got 6.25 | 来源 |
| HL-01 owner-occupier high DTI | sourced | 通过 | expected true | 来源 |
| HL-02 DTI 600000/100000 | computed from sourced rule | 通过 | expected 6, got 6 | 来源 |
| HL-02 high DTI flag at 6 (owner-occupier) | computed from sourced rule | 通过 | expected false, got false | 来源 |
| HL-02 DTI 601000/100000 | computed from sourced rule | 通过 | expected 6.01, got 6.01 | 来源 |
| HL-02 high DTI flag at 6.01 (owner-occupier) | computed from sourced rule | 通过 | expected true, got true | 来源 |
| HL-03 investor DTI | computed from sourced rule | 通过 | expected 7, got 7 | 来源 |
| HL-03 investor at 7 is not high | computed from sourced rule | 通过 | expected false | 来源 |
| HL-04 max total debt at DTI 6 | computed from sourced rule | 通过 | expected 720000, got 720000 | 来源 |
| HL-04 max new home loan after the card limit | computed from sourced rule | 通过 | expected 710000, got 710000 | 来源 |
| HL-05 LVR 640000/800000 | computed from sourced rule | 通过 | expected 0.8, got 0.8 | 来源 |
| HL-05 high LVR flag at 0.8 (owner-occupier) | computed from sourced rule | 通过 | expected false, got false | 来源 |
| HL-05 LVR 640080/800000 | computed from sourced rule | 通过 | expected 0.8001, got 0.8001 | 来源 |
| HL-05 high LVR flag at 0.8001 (owner-occupier) | computed from sourced rule | 通过 | expected true, got true | 来源 |
| HL-06 investor LVR | computed from sourced rule | 通过 | expected 0.7, got 0.7 | 来源 |
| HL-06 investor at 70% is not high | computed from sourced rule | 通过 | expected false | 来源 |
| HL-06 investor deposit for standard lending | computed from sourced rule | 通过 | expected 270000, got 270000 | 来源 |
| HL-07 deposit firstHomeLoan5pct | computed from sourced rules | 通过 | expected 35000, got 35000 | 来源 |
| HL-07 deposit standard20pct | computed from sourced rules | 通过 | expected 140000, got 140000 | 来源 |
| HL-07 deposit investor30pct | computed from sourced rules | 通过 | expected 210000, got 210000 | 来源 |
| HL-08 First Home Loan premium1_2pct | computed from sourced rule | 通过 | expected 6840, got 6840 | 来源 |
| HL-08 First Home Loan kiwibankFee1_0pct | computed from sourced rule | 通过 | expected 5700, got 5700 | 来源 |
| HL-08 First Home Loan oldRate0_5pct | computed from sourced rule | 通过 | expected 2850, got 2850 | 来源 |
| HL-09 First Home Loan eligibility: 1 buyer(s), 0 dependant(s), $95000 | computed from sourced rule | 通过 | expected true, got true | 来源 |
| HL-09 First Home Loan eligibility: 1 buyer(s), 0 dependant(s), $95001 | computed from sourced rule | 通过 | expected false, got false | 来源 |
| HL-09 First Home Loan eligibility: 1 buyer(s), 1 dependant(s), $150000 | computed from sourced rule | 通过 | expected true, got true | 来源 |
| HL-09 First Home Loan eligibility: 2 buyer(s), 0 dependant(s), $150000 | computed from sourced rule | 通过 | expected true, got true | 来源 |
| HL-09 First Home Loan eligibility: 2 buyer(s), 0 dependant(s), $150001 | computed from sourced rule | 通过 | expected false, got false | 来源 |
| HL-10 KiwiSaver withdrawal from $25000 | computed from sourced rule | 通过 | expected 24000, got 24000 | 来源 |
| HL-10 KiwiSaver withdrawal from $800 | computed from sourced rule | 通过 | expected 0, got 0 | 来源 |
| HL-10 KiwiSaver withdrawal from $30000 ($5000 from Australia) | computed from sourced rule | 通过 | expected 24000, got 24000 | 来源 |
| HL-11 loan $3000 a month supports at 6.85% | computed | 通过 | expected 457834.08, got 457834.0814 | 来源 |
| HL-12 loan $3000 a month supports at 7.1% | computed | 通过 | expected 446407.34, got 446407.3408 | 来源 |
| HL-13 low equity premium rate (UNVERIFIED rates) | computed from single-source rates | 通过 | expected 0.0075, got 0.0075 | 来源 |
| HL-13 low equity premium a year | computed from single-source rates | 通过 | expected 4500, got 4500 | 来源 |
| HL-14 gross rent a year | computed (default is a choice, see research s 3.4) | 通过 | expected 33800, got 33800 | 来源 |
| HL-14 rent counted at 75% | computed (default is a choice, see research s 3.4) | 通过 | expected 25350, got 25350 | 来源 |
| engine: DTI thresholds and speed limits match the rules file | engine | 通过 | 6 and 7, 20% each | 来源 |
| engine: LVR thresholds and speed limits match the rules file | engine | 通过 | 80% and 70%, 25% and 10% | 来源 |
| engine: bank test rates match the rules file | engine | 通过 | ANZ 6.85%, ASB 6.85%, BNZ 7.1%, Kiwibank 6.95%, Westpac 6.95% | 来源 |
| engine: First Home Loan deposit, caps and premiums match the rules file | engine | 通过 | 5%, $95,000 / $150,000, 1.2% and 1.00% | 来源 |
| engine: KiwiSaver, low equity premiums, rent share and cost ranges match the rules file | engine | 通过 | 3 years and $1,000; Canstar bands; 75% (70 to 80%); cost ranges | |
| engine: principalForPayment and tablePayment round trip to the cent | engine | 通过 | loan 485506.99 back to 3210.5500 a month | |
| engine: at a 0% rate the surplus supports surplus x months | engine | 通过 | got 1800000 | |
| engine: serviceability binds when it is the lowest limit, and the loan equals it | engine | 通过 | loan 710745.16; DTI 755000; LVR 800000.0000000002 | |
| engine: LVR binds with a small deposit (loan = deposit x 4 at 80%) | engine | 通过 | loan 400000.0000000001, LVR 0.8 | |
| engine: DTI binds with high take-home and a big deposit (6 x income less debts) | engine | 通过 | loan 575000, DTI after 6 | |
| engine: First Home Loan path lends to 95% and is DTI exempt | engine | 通过 | LVR limit 759999.9999999993 | |
| engine: investors use 7 x income and a 30% deposit (no First Home Loan) | engine | 通过 | DTI limit 885000, LVR limit 699999.9999999999 | |
| engine: our living-cost floor applies when entered costs are lower (our assumption, labelled) | engine | 通过 | used 2400 | |
| engine: no surplus means no serviceability, and serviceability binds | engine | 通过 | surplus -600 | |
| engine: banks listed alphabetically, and a higher test rate never lends more | engine | 通过 | ANZ 717273, ASB 717273, BNZ 699372, Kiwibank 710026, Westpac 710026 | |
| engine: average of the five test rates is 6.94% | engine | 通过 | got 6.94 | |
| engine: borrowing exactly the DTI limit leaves DTI at 6, which is not high | engine | 通过 | limit 600000 | |
| engine: the LVR limit loan sits exactly at 80%, not above it; a dollar more is high | engine | 通过 | loan 640000.0000000001 | |
| engine: low equity bands split at 80%, 85%, 90% and 95% | engine | 通过 | bands -1, 0, 1, 2, 3 | |
| engine: KiwiSaver first-home withdrawal needs 3 years of membership | engine | 通过 | 2.9 years no, 3 years yes | |
| engine: debts reduce the DTI limit dollar for dollar, including card limits | engine | 通过 | never below zero |