PMI 费率如何确定？

PMI 费率由 PMI company 基于 risk factors 定价：LTV（越高 rate 越高）、credit score（越低 rate 越高）、loan type（fixed vs ARM）、occupancy（primary vs investment）、loan amount。Typical range 0.5–1.5% of original loan amount per year。Lender 在 Loan Estimate 中 disclose PMI premium。Shop multiple lenders——PMI rates vary by lender's MI company agreements。

BPMI、LPMI 和 Split Premium 怎么选？

BPMI：monthly premium，HPA cancellation rights at 78%/80% LTV——most common and usually best for planning to cancel。LPMI：no monthly PMI but higher rate——may suit short hold period if rate premium < BPMI total。Split Premium：partial upfront payment + lower monthly——reduces monthly payment shock but upfront cost at closing。Compare total cost over expected hold period。

如何申请取消 PMI（80% LTV）？

Steps：（1）Contact loan servicer（on mortgage statement）；（2）Submit written PMI cancellation request；（3）Confirm good payment history（no 30-day late in past year）；（4）Servicer may require appraisal to confirm current LTV ≤ 80%；（5）If approved，PMI removed within 30 days。HPA requires servicer to provide cancellation info annually for first 2 years。

Home appreciation 如何加速 PMI 取消？

PMI cancellation based on **current LTV** = current loan balance / current home value。若 home appreciates，LTV drops faster than scheduled amortization alone。Example：5% down loan，home appreciates 10% in 3 years → LTV may already be ~86% vs scheduled ~92%。Combined with extra principal payments，may reach 80% in 3–5 years vs 7–9 years on schedule alone。Appraisal confirms value for 80% request。

机会成本分析怎么做？

Formula：（1）Calculate PMI total cost = monthly PMI × estimated months until 78% LTV；（2）Calculate extra interest from larger loan = (loan_low_down - loan_20_down) × rate × years；（3）Sum = total low-down penalty。（4）Opportunity cost of extra down = extra_down × expected_annual_return × years。（5）If penalty < opportunity cost → low down + PMI may win。Use conservative return assumptions（4–7%）——market returns not guaranteed。

FHA MIP 能否取消？

FHA MIP rules（须查 HUD 当前指南）：若 origination LTV > 90%，annual MIP 通常 for **life of loan**——不可 cancel regardless of LTV later。若 origination LTV ≤ 90%，MIP 可能 cancel after 11 years。Upfront MIP 1.75% 不可 refund（except limited FHA Streamline scenarios）。Path to remove MIP：refinance to conventional when LTV ≤ 80% and meet credit/DTI requirements。

Gift funds 能否用于 20% down？

Conventional：gift funds allowed for down payment on primary residence——donor 须 provide gift letter stating no repayment expected。Some programs require borrower contribution（如 3% own funds for investment property）。FHA：gift from family member allowed。Verify lender overlay——some require donor bank statements or proof of transfer。

PMI 对 taxes 有影响吗？

PMI premiums 曾可 itemize deduct（2017–2021 多次 extended），但 **2022+ 联邦 tax law 中 PMI deduction 已 expired**（除非 Congress 再次 extend）。Check current tax year law 或 consult CPA。PMI deductibility 不影响 whether to pay PMI——focus on monthly cost and cancellation timeline。

万一攒不够 20% 首付，但又不想付 PMI 怎么办？

Options：（1）低首付 + PMI ——HPA 保障可取消，非永久；（2） Piggyback loan （80-10-10：80% first + 10% second + 10% down）——无 PMI 但 second lien rate 更高；（3） DPA programs ——州/地方 down payment assistance（须查 local programs）；（4） Wait and save ——但 opportunity cost of waiting。

万一 servicer 拒绝我的 PMI 取消申请怎么办？

Servicer 可能拒绝原因：late payment history、appraisal 显示 LTV > 80%、或 subordinate liens。Borrower 有权 under HPA 要求 written explanation。 Remedies：provide additional appraisal、make extra principal payment to reach 78% on schedule、file CFPB complaint if HPA violation、或 refi to remove PMI。

万一我的 FHA 贷款 MIP 无法取消，什么时候该 refi 到 conventional？

FHA MIP 通常 for life of loan（LTV > 90% at origination）——refi 是 primary exit path。 Refi when：（1）LTV ≤ 80%（via appreciation + paydown）；（2）credit improved to 620+（preferably 740+ for rate）；（3）refi closing costs

万一房价下跌，PMI 取消会受影响吗？

Yes——PMI cancellation based on current LTV = balance / current value。Value drop → LTV rises → cancellation delayed。 Scheduled 78% auto-termination uses original value for amortization schedule——不受 market drop 影响 for automatic termination at 78% on schedule。但 80% request 需要 current value——market drop hurts。

万一家人赠款帮我凑 20% 首付，有什么注意事项？

Gift funds allowed for conventional primary residence down payment。Requirements： gift letter （donor name、relationship、amount、statement of no repayment）、donor bank statements 或 proof of transfer（lender overlay）。 Using gift for 20% down is legitimate——但 ensure donor understands tax implications（annual gift tax exclusion $18K per donor per recipient in 2024，须查 IRS 当前年度 limit）。

PMI vs 更大首付：如何权衡？

Q: 如何申请取消 PMI（80% LTV）？

Steps：（1）Contact loan servicer（on mortgage statement）；（2）Submit written PMI cancellation request；（3）Confirm good payment history（no 30-day late in past year）；（4）Servicer may require appraisal to confirm current LTV ≤ 80%；（5）If approved，PMI removed within 30 days。HPA requires servicer to provide cancellation info annually for first 2 years。

Q: Home appreciation 如何加速 PMI 取消？

PMI cancellation based on **current LTV** = current loan balance / current home value。若 home appreciates，LTV drops faster than scheduled amortization alone。Example：5% down loan，home appreciates 10% in 3 years → LTV may already be ~86% vs scheduled ~92%。Combined with extra principal payments，may reach 80% in 3–5 years vs 7–9 years on schedule alone。Appraisal confirms value for 80% request。

Q: 机会成本分析怎么做？

Formula：（1）Calculate PMI total cost = monthly PMI × estimated months until 78% LTV；（2）Calculate extra interest from larger loan = (loan_low_down - loan_20_down) × rate × years；（3）Sum = total low-down penalty。（4）Opportunity cost of extra down = extra_down × expected_annual_return × years。（5）If penalty < opportunity cost → low down + PMI may win。Use conservative return assumptions（4–7%）——market returns not guaranteed。

Q: FHA MIP 能否取消？

FHA MIP rules（须查 HUD 当前指南）：若 origination LTV > 90%，annual MIP 通常 for **life of loan**——不可 cancel regardless of LTV later。若 origination LTV ≤ 90%，MIP 可能 cancel after 11 years。Upfront MIP 1.75% 不可 refund（except limited FHA Streamline scenarios）。Path to remove MIP：refinance to conventional when LTV ≤ 80% and meet credit/DTI requirements。

Q: 万一攒不够 20% 首付，但又不想付 PMI 怎么办？

Options：（1） 低首付 + PMI ——HPA 保障可取消，非永久；（2） Piggyback loan （80-10-10：80% first + 10% second + 10% down）——无 PMI 但 second lien rate 更高；（3） DPA programs ——州/地方 down payment assistance（须查 local programs）；（4） Wait and save ——但 opportunity cost of waiting。

PMI vs Larger Down Payment

对比分析13分钟更新于 2026-07-21

若 cash 有限、希望尽快入市 → 低首付 + PMI 是常见路径，PMI 非永久（HPA 保障 conventional BPMI 在 LTV ≤ 78% 自动取消）。若有足够 cash 且 opportunity cost 低于 PMI 总成本 → 20% down 更省 long-term interest + PMI。算数示例：$400K home，5% down（$20K）vs 20% down（$80K），差额 $60K。PMI 约 0.8%/年 on $380K loan ≈ $250/月 × ~8 年 until 78% LTV ≈ $24K total PMI（因 appreciation 和 paydown 而异）。若 $60K 投资 7% annual ≈ $4.2K/年回报，8 年 ≈ $33K+（非保证）——PMI path 可能更优若 market 表现好，但含 investment risk。Credit 680 vs 760 PMI 费率可能差 0.3–0.5%/年。FHA 3.5% down 须 MIP（通常 life of loan if LTV > 90% at origination）——long-term 常比 conventional PMI 贵。

低首付 + PMI（3–5% Down）— Cash 有限但 stable income、good credit（PMI rate 较低）、希望尽早购房、且 opportunity cost of waiting/saving 20% 较高的买家。Market 上涨期「time in market」可能 outweigh PMI cost——但非保证。20% 首付（免 PMI）— Cash 充足（20% down + closing costs + 3–6 months emergency fund remaining）、PMI total projected cost exceeds opportunity cost of extra down、或 prefer lower monthly payment and total interest 的买家。

先给答案

快速结论 + 2 个选项怎么选

比较维度

9 个关键差异，含适合谁与优缺点

可信度

4 个参考来源 · 更新 2026-07-21

关键要点 KEY TAKEAWAYS

1PMI 成本通常约为贷款额的 0.5–1.5%/年（随 LTV 和 credit score 梯度变化）
2Conventional 最低首付可至 3–5%（须 PMI）；20% down 免 PMI
3Homeowners Protection Act（HPA）：LTV 达 78% 自动取消 BPMI，80% 时可申请取消
4LPMI（Lender-Paid PMI）vs BPMI（Borrower-Paid）vs Split Premium 结构不同
5FHA MIP 对 current loans 通常不可取消（须 refi 至 conventional）；Conventional PMI 可取消
6机会成本：首付差额若投资 broad market 的长期回报 vs PMI 总成本

?大家都在问 Popular Questions

先看看其他人最关心的问题

查看全部常见问题（8）

跳转到:如何选择对比表结论常见问题 FAQ

如何选择

明确你的需求

你是需要低首付 + PMI（3–5% Down）还是 20% 首付（免 PMI）？看下方场景匹配

比较关键差异

对比表列出了 9 个维度的核心区别

做出选择

阅读逐项详解和案例确认最终方案

谁该选什么 WHO SHOULD CHOOSE

低

低首付 + PMI（3–5% Down）

Cash 有限但 stable income、good credit（PMI rate 较低）、希望尽早购房、且 opportunity cost of waiting/saving 20% 较高的买家。Market 上涨期「time in market」可能 outweigh PMI cost——但非保证。

✓ Lower upfront cash requirement——更早进入 housing market✗ Monthly payment 含 PMI premium——更高 initial housing cost

20% 首付（免 PMI）

Cash 充足（20% down + closing costs + 3–6 months emergency fund remaining）、PMI total projected cost exceeds opportunity cost of extra down、或 prefer lower monthly payment and total interest 的买家。

✓ 无 PMI——immediate monthly payment savings✗ Significantly higher upfront cash requirement

对比表 COMPARISON

查看对比

低首付 + PMI（3–5% Down）

Upfront Cash 需求: 3–5% down + closing costs（$400K home 约 $12K–$20K down）
PMI / MI 成本: BPMI 通常 0.5–1.5% of loan amount/年（LTV 和 credit 越高 cost 越高）
初期月供: Principal + interest on larger loan + PMI premium
PMI 取消规则: HPA：78% LTV 自动取消 BPMI；80% 时可 request；须 good payment history
PMI 类型选项: BPMI（monthly）、LPMI（higher rate 代替 monthly PMI）、Split Premium（upfront + monthly）
FHA MIP 对比: FHA 3.5% down 须 MIP（upfront 1.75% + annual），通常不可取消 unless refi
机会成本: 保留 cash 用于 emergency fund、investment、repairs——potential return vs PMI cost
Total Interest: Larger loan → more total interest over life（even after PMI cancels）
最适合: Cash 有限、market 上涨想尽早 lock in、credit 良好 PMI rate 较低

20% 首付（免 PMI）

Upfront Cash 需求: 20% down + closing costs（$400K home 约 $80K down）
PMI / MI 成本: Conventional 20% down 无 PMI；FHA 20% down 仍可能有 upfront MIP
初期月供: Principal + interest on smaller loan，无 PMI
PMI 取消规则: 不适用（无 PMI from start）
PMI 类型选项: 不适用
FHA MIP 对比: FHA 20% down 仍付 upfront MIP，annual MIP 可能较短（须查 HUD 当前规则）
机会成本: 额外 down 减少 loan amount 和 total interest，但 cash 不再 available for other uses
Total Interest: Smaller loan → less total interest
最适合: Cash 充足、PMI 总成本 > opportunity cost、想 lower monthly payment

对比表 COMPARISON
对比表	低首付 + PMI（3–5% Down） low_down_pmi	20% 首付（免 PMI） twenty_percent_down
Upfront Cash 需求 upfront_cash	3–5% down + closing costs（$400K home 约 $12K–$20K down）	20% down + closing costs（$400K home 约 $80K down）
PMI / MI 成本 pmi_cost	BPMI 通常 0.5–1.5% of loan amount/年（LTV 和 credit 越高 cost 越高）	Conventional 20% down 无 PMI；FHA 20% down 仍可能有 upfront MIP
初期月供 monthly_payment	Principal + interest on larger loan + PMI premium	Principal + interest on smaller loan，无 PMI
PMI 取消规则 pmi_cancellation	HPA：78% LTV 自动取消 BPMI；80% 时可 request；须 good payment history	不适用（无 PMI from start）
PMI 类型选项 pmi_types	BPMI（monthly）、LPMI（higher rate 代替 monthly PMI）、Split Premium（upfront + monthly）	不适用
FHA MIP 对比 fha_comparison	FHA 3.5% down 须 MIP（upfront 1.75% + annual），通常不可取消 unless refi	FHA 20% down 仍付 upfront MIP，annual MIP 可能较短（须查 HUD 当前规则）
机会成本 opportunity_cost	保留 cash 用于 emergency fund、investment、repairs——potential return vs PMI cost	额外 down 减少 loan amount 和 total interest，但 cash 不再 available for other uses
Total Interest total_interest	Larger loan → more total interest over life（even after PMI cancels）	Smaller loan → less total interest
最适合 best_for	Cash 有限、market 上涨想尽早 lock in、credit 良好 PMI rate 较低	Cash 充足、PMI 总成本 > opportunity cost、想 lower monthly payment

了解更多 算 PMI total cost until cancellation vs 额外 down payment 的 opportunity cost 和 interest savings。Credit ≥ 740 且 LTV 95% PMI 较低。FHA buyer 长期持有须比较 MIP vs conventional PMI + refi path。保留 emergency fund——勿为 20% down 耗尽全部 savings。

深入了解 LEARN MORE

→ PMI 指南

逐项详解

1低首付 + PMI（3–5% Down）

最适合：Cash 有限但 stable income、good credit（PMI rate 较低）、希望尽早购房、且 opportunity cost of waiting/saving 20% 较高的买家。Market 上涨期「time in market」可能 outweigh PMI cost——但非保证。

Conventional conforming loans 允许最低 3% down（HomeReady/Home Possible 等 program）或 5% down（standard conventional），LTV > 80% 时 lender 要求 Private Mortgage Insurance（PMI）保护 lender against default。PMI premium 通常按 annual rate × loan amount 计算，常见 range 0.5–1.5%/年——credit score 760+ 且 LTV 95% 可能在低端，credit 680 LTV 97% 可能在高端。BPMI（Borrower-Paid Mortgage Insurance）是最常见形式：monthly premium 加在 mortgage payment 中。Homeowners Protection Act（12 USC 4901，HPA）规定：borrower-paid PMI 在 scheduled amortization 达到 78% LTV 时自动终止；达到 80% LTV 时 borrower 可书面申请取消（须 good payment history，lender 可能 require appraisal）。Actual cancellation timing 受 home appreciation 和 extra principal payments 影响——可能早于 scheduled date。LPMI（Lender-Paid MI）：lender 付 PMI 但 charge higher interest rate——break-even 取决于 hold period。Split Premium：部分 upfront + reduced monthly。FHA 3.5% down 使用 MIP 而非 PMI——upfront 1.75% + annual 0.55%（typical，须查 HUD 当前费率），且 MIP 通常 for life of loan if LTV > 90% at origination——long-term cost 常高于 conventional PMI。

✓ 优点

+ Lower upfront cash requirement——更早进入 housing market
+ 保留 cash for emergency fund、investments、repairs、closing costs
+ PMI 非永久——HPA 保障 conventional BPMI 可取消
+ Home price appreciation 可能 accelerate PMI cancellation（via lower LTV）
+ 3–5% down programs 使 homeownership accessible to more buyers

✗ 缺点

− Monthly payment 含 PMI premium——更高 initial housing cost
− PMI 不提供 borrower 任何 protection——纯 lender protection
− Larger loan amount → more total interest over loan life
− Credit 较低时 PMI rate 显著更高
− FHA MIP 通常不可取消——long-term cost penalty vs conventional

220% 首付（免 PMI）

最适合：Cash 充足（20% down + closing costs + 3–6 months emergency fund remaining）、PMI total projected cost exceeds opportunity cost of extra down、或 prefer lower monthly payment and total interest 的买家。

20% down payment 是 conventional mortgage 免 PMI 的传统 threshold——LTV 80% 时 lender 通常不要求 private mortgage insurance（因 20% borrower equity cushion）。On $400K home，20% = $80K down vs 5% = $20K——差额 $60K 须来自 savings、gift、或 DPA（down payment assistance，若 eligible）。Benefits：（1）无 PMI monthly cost；（2）smaller loan amount → lower monthly P&I 和 less total interest；（3）stronger offer signal in competitive market（部分 seller/agent 偏好）；（4）more equity cushion against market downturn。Costs：（1）$60K+ tied up in illiquid home equity；（2）opportunity cost——若 $60K invested at 7% ≈ $4.2K/year（historical stock market average 非 guarantee）；（3）reduced cash reserves for emergencies。Break-even analysis：PMI total cost until 78% LTV vs extra down's interest savings + PMI avoided。Also consider：20% down 不 guarantee better rate——rate primarily driven by credit score、LTV tier（80% vs 95% may differ 0.125–0.25%）、and market conditions。

✓ 优点

+ 无 PMI——immediate monthly payment savings
+ Smaller loan → less total interest over 30 years
+ More initial equity——buffer against negative equity in downturn
+ Potentially stronger purchase offer
+ Lower LTV may qualify for slightly better rate tier

✗ 缺点

− Significantly higher upfront cash requirement
− Opportunity cost of capital tied in home
− May deplete emergency fund if savings insufficient
− Delayed home purchase while saving 20%
− Missed market appreciation during saving period（非 guarantee）

场景案例

场景 | Scenario

李先生购买 $350K home，credit 750，有 $70K savings。Closing costs 约 $10K。

5% down + PMI 还是 20% down？

场景 | Scenario

张女士 $500K home，credit 700，$120K savings。Compare 5% vs 20% down over 10 years。

哪种更省 total cost？

场景 | Scenario

王先生 FHA 3.5% down 购买 $300K home，计划长期持有 20+ 年。

FHA MIP vs 攒到 20% conventional？

场景 | Scenario

陈女士 LTV 已降至 79%（通过 paydown 和 appreciation），BPMI $180/月，已付 4 年。

如何取消 PMI？

💡

万一遇到这些情况怎么办？

实际生活中常见的问题和客观解决方案

💰

储蓄不足

(1)

📋

取消被拒

(1)

🔄

FHA 转贷

(1)

📉

房价下跌

(1)

🎁

赠款首付

(1)

知识自测

1 / 3

Homeowners Protection Act 规定 BPMI 何时自动取消？

误区判断

1 / 5

PMI 是永久费用，一旦开始就要付到贷款还清

何时寻求专业帮助

关于低首付 + PMI（3–5% Down） vs 20% 首付（免 PMI）的选择仅供教育参考。以下情况建议咨询专业人士：

•您的具体情况涉及较大金额或较高风险
•您不确定哪个选项更适合您的个人情况
•您需要考虑税务、法律或州别因素

结论

Cash 有限 → 低首付 + PMI（HPA 保障 78% 自动/80% 申请取消），保留 emergency fund。Cash 充足且 PMI 总成本 > 额外 down 的机会成本 → 20% down 省 PMI 和 interest。算 personalized break-even：PMI months × premium vs extra down 的 investment return + interest savings。FHA MIP 通常不可取消——长期持有者 plan refi to conventional at 80% LTV。Credit score 直接影响 PMI rate——申请前 optimize credit。

选项	最适合	✓	✗
低首付 + PMI（3–5% Down）	Cash 有限但 stable income、good credit（PMI rate 较低）、希望尽早购房、且 opportunity cost of waiting/saving 20% 较高的买家。Market 上涨期「time in market」可能 outweigh PMI cost——但非保证。	Lower upfront cash requirement——更早进入 housing market	Monthly payment 含 PMI premium——更高 initial housing cost
20% 首付（免 PMI）	Cash 充足（20% down + closing costs + 3–6 months emergency fund remaining）、PMI total projected cost exceeds opportunity cost of extra down、或 prefer lower monthly payment and total interest 的买家。	无 PMI——immediate monthly payment savings	Significantly higher upfront cash requirement

下一步

1PMI 指南 →2Conventional vs Jumbo →

常见问题 FAQ(8)

继续探索

如果你正在...

选择最符合你当前情况的场景，按步骤继续阅读

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教育内容，不构成专业建议 | Educational content, not professional advice. 完整免责声明

如何选择

明确你的需求

你是需要低首付 + PMI（3–5% Down）还是 20% 首付（免 PMI）？看下方场景匹配

比较关键差异

对比表列出了 9 个维度的核心区别

做出选择

阅读逐项详解和案例确认最终方案

谁该选什么 WHO SHOULD CHOOSE

低

低首付 + PMI（3–5% Down）

✓ Lower upfront cash requirement——更早进入 housing market✗ Monthly payment 含 PMI premium——更高 initial housing cost

20% 首付（免 PMI）

✓ 无 PMI——immediate monthly payment savings✗ Significantly higher upfront cash requirement

对比表 COMPARISON

查看对比

低首付 + PMI（3–5% Down）

Upfront Cash 需求: 3–5% down + closing costs（$400K home 约 $12K–$20K down）
PMI / MI 成本: BPMI 通常 0.5–1.5% of loan amount/年（LTV 和 credit 越高 cost 越高）
初期月供: Principal + interest on larger loan + PMI premium
PMI 取消规则: HPA：78% LTV 自动取消 BPMI；80% 时可 request；须 good payment history
PMI 类型选项: BPMI（monthly）、LPMI（higher rate 代替 monthly PMI）、Split Premium（upfront + monthly）
FHA MIP 对比: FHA 3.5% down 须 MIP（upfront 1.75% + annual），通常不可取消 unless refi
机会成本: 保留 cash 用于 emergency fund、investment、repairs——potential return vs PMI cost
Total Interest: Larger loan → more total interest over life（even after PMI cancels）
最适合: Cash 有限、market 上涨想尽早 lock in、credit 良好 PMI rate 较低

20% 首付（免 PMI）

Upfront Cash 需求: 20% down + closing costs（$400K home 约 $80K down）
PMI / MI 成本: Conventional 20% down 无 PMI；FHA 20% down 仍可能有 upfront MIP
初期月供: Principal + interest on smaller loan，无 PMI
PMI 取消规则: 不适用（无 PMI from start）
PMI 类型选项: 不适用
FHA MIP 对比: FHA 20% down 仍付 upfront MIP，annual MIP 可能较短（须查 HUD 当前规则）
机会成本: 额外 down 减少 loan amount 和 total interest，但 cash 不再 available for other uses
Total Interest: Smaller loan → less total interest
最适合: Cash 充足、PMI 总成本 > opportunity cost、想 lower monthly payment

对比表 COMPARISON
对比表	低首付 + PMI（3–5% Down） low_down_pmi	20% 首付（免 PMI） twenty_percent_down
Upfront Cash 需求 upfront_cash	3–5% down + closing costs（$400K home 约 $12K–$20K down）	20% down + closing costs（$400K home 约 $80K down）
PMI / MI 成本 pmi_cost	BPMI 通常 0.5–1.5% of loan amount/年（LTV 和 credit 越高 cost 越高）	Conventional 20% down 无 PMI；FHA 20% down 仍可能有 upfront MIP
初期月供 monthly_payment	Principal + interest on larger loan + PMI premium	Principal + interest on smaller loan，无 PMI
PMI 取消规则 pmi_cancellation	HPA：78% LTV 自动取消 BPMI；80% 时可 request；须 good payment history	不适用（无 PMI from start）
PMI 类型选项 pmi_types	BPMI（monthly）、LPMI（higher rate 代替 monthly PMI）、Split Premium（upfront + monthly）	不适用
FHA MIP 对比 fha_comparison	FHA 3.5% down 须 MIP（upfront 1.75% + annual），通常不可取消 unless refi	FHA 20% down 仍付 upfront MIP，annual MIP 可能较短（须查 HUD 当前规则）
机会成本 opportunity_cost	保留 cash 用于 emergency fund、investment、repairs——potential return vs PMI cost	额外 down 减少 loan amount 和 total interest，但 cash 不再 available for other uses
Total Interest total_interest	Larger loan → more total interest over life（even after PMI cancels）	Smaller loan → less total interest
最适合 best_for	Cash 有限、market 上涨想尽早 lock in、credit 良好 PMI rate 较低	Cash 充足、PMI 总成本 > opportunity cost、想 lower monthly payment

逐项详解

1低首付 + PMI（3–5% Down）

✓ 优点

+ Lower upfront cash requirement——更早进入 housing market
+ 保留 cash for emergency fund、investments、repairs、closing costs
+ PMI 非永久——HPA 保障 conventional BPMI 可取消
+ Home price appreciation 可能 accelerate PMI cancellation（via lower LTV）
+ 3–5% down programs 使 homeownership accessible to more buyers

✗ 缺点

− Monthly payment 含 PMI premium——更高 initial housing cost
− PMI 不提供 borrower 任何 protection——纯 lender protection
− Larger loan amount → more total interest over loan life
− Credit 较低时 PMI rate 显著更高
− FHA MIP 通常不可取消——long-term cost penalty vs conventional

220% 首付（免 PMI）

✓ 优点

+ 无 PMI——immediate monthly payment savings
+ Smaller loan → less total interest over 30 years
+ More initial equity——buffer against negative equity in downturn
+ Potentially stronger purchase offer
+ Lower LTV may qualify for slightly better rate tier

✗ 缺点

− Significantly higher upfront cash requirement
− Opportunity cost of capital tied in home
− May deplete emergency fund if savings insufficient
− Delayed home purchase while saving 20%
− Missed market appreciation during saving period（非 guarantee）

场景案例

场景 | Scenario

李先生购买 $350K home，credit 750，有 $70K savings。Closing costs 约 $10K。

5% down + PMI 还是 20% down？

场景 | Scenario

张女士 $500K home，credit 700，$120K savings。Compare 5% vs 20% down over 10 years。

哪种更省 total cost？

场景 | Scenario

王先生 FHA 3.5% down 购买 $300K home，计划长期持有 20+ 年。

FHA MIP vs 攒到 20% conventional？

场景 | Scenario

陈女士 LTV 已降至 79%（通过 paydown 和 appreciation），BPMI $180/月，已付 4 年。

如何取消 PMI？

选项

最适合

✓

✗

低首付 + PMI（3–5% Down）

Lower upfront cash requirement——更早进入 housing market

Monthly payment 含 PMI premium——更高 initial housing cost

20% 首付（免 PMI）

无 PMI——immediate monthly payment savings

Significantly higher upfront cash requirement