# calculate_mortgage_payment

> Calculate estimated monthly mortgage payment with PITI breakdown (Principal, Interest, Taxes, Insurance).

<!-- Source: https://docs.actuallycare.com/tools/financial/calculate_mortgage_payment -->

```text
Calculate estimated monthly mortgage payment with PITI breakdown (Principal, Interest, Taxes, Insurance). Use when a buyer asks what their monthly payment would be for a given price or loan. Includes: P&I, property taxes, homeowners insurance, HOA dues, and PMI if applicable (down payment < 20%). Can calculate from loan_amount OR from purchase_price with down_payment_pct. Returns itemized estimate of each component. NOTE: These are estimates — actual payments depend on lender terms. This is not financial advice.
```

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `loan_amount` | number | No | Total loan amount in dollars. Provide this OR purchase_price+down_payment_pct. · Min: 0 |
| `purchase_price` | number | No | Purchase price (used with down_payment_pct to calculate loan) · Min: 0 |
| `down_payment_pct` | number | No | Down payment as percentage (e.g., 20 for 20%) · Max: 100 · Min: 0 |
| `interest_rate` | number | Yes | Annual interest rate as percentage (required, e.g., 6.5 for 6.5%) · Max: 20 · Min: 0 |
| `loan_term_years` | number | No | Loan term in years (default: 30) · Max: 40 · Min: 1 |
| `property_tax_rate` | number | No | Annual property tax rate as percentage (default: 1.1 for CA) · Max: 5 · Min: 0 |
| `homeowners_insurance` | number | No | Annual homeowners insurance. If not provided, estimated as 0.35% of purchase price. · Min: 0 |
| `hoa_monthly` | number | No | Monthly HOA dues (default: 0) · Min: 0 |
| `pmi_rate` | number | No | PMI rate as percentage of loan if down payment < 20% (default: 0.5) · Max: 3 · Min: 0 |
| `include_pmi` | boolean | No | Include PMI in calculation. Auto-included if down payment < 20% (default: true if applicable) |

## Example prompts

- "What is the monthly PITI on a 452000 loan at 6.5 percent over 30 years?"
- "Estimate the payment at 612500, 15 percent down, 6.75 rate, 320 monthly HOA."

## Safety

**Calculator.** Pure math. Reads nothing and writes nothing in your CRM.