Louisiana Mortgage Calculator

Last updated: February 28, 2026

Build a realistic Louisiana housing-payment estimate by combining mortgage principal and interest with parish property tax, home insurance, flood insurance, PMI, and HOA assumptions. The goal is to help you compare scenarios before lender pre-approval and reduce budget surprises during offer and closing stages.

Louisiana Mortgage Input

Estimate monthly housing cost using parish tax and insurance assumptions.

Quick Presets

Louisiana Mortgage Results

Estimated Monthly Housing Payment

$1,994.14

Loan maturity target: March 2056

Loan amount

$240,000

Principal and interest

$1,556.64

Total interest (30 years)

$320,390

Five-year equity (no appreciation)

$74,698

Monthly Cost Bridge

Principal and interest$1,556.64

Parish property tax$137.50

Home insurance$200.00

Flood insurance$100.00

Total monthly payment$1,994.14

About $138 lower per month than the 1.10% national property-tax baseline.

Difference vs Texas 1.60% baseline: $263 per month.

Formula Preview

P&I = L x [r(1+r)^n] / [(1+r)^n - 1]

Total monthly = P&I + tax/12 + home insurance/12 + flood insurance/12 + PMI + HOA.

Interpretation Snapshot

Down payment ratio

20.00%

Non-principal share

21.94%

Principal paid in 5 years

$14,698

Down payment is at or above 20%, which usually avoids PMI on conventional loans.
This parish tax assumption is lower than the national baseline by about $138 per month.
Estimated first-year housing cost is $23,930. Keep cash reserves for repairs and premium changes.

Cost component	Monthly	Annualized	Share
Principal and interest	$1,556.64	$18,680	78.06%
Parish property tax	$137.50	$1,650	6.90%
Home insurance	$200.00	$2,400	10.03%
Flood insurance	$100.00	$1,200	5.01%

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Editorial & Review Information

Reviewed on: 2026-02-27

Published on: 2025-09-22

Author: LumoCalculator Editorial Team

What we checked: We re-checked the fixed-rate amortization logic, parish millage conversion, insurance and escrow cost roll-up, and key scenario outputs (including down-payment-sensitive PMI paths) against the listed public references.

Purpose and scope: This page is an educational planning tool for scenario comparison. It is intended for budgeting and option analysis, not legal, tax, underwriting, or individualized financial advice.

How to use this review: Use results to compare parish/location scenarios, then confirm final tax bill, insurance requirements, escrow treatment, and lender fees in your Loan Estimate plus official parish records before making a commitment.

Financial Disclaimer

Results are directional estimates based on constant-rate assumptions and user-entered costs. Real-world payments can change due to lender underwriting, escrow policy, hazard and flood premium revisions, property reassessment, and local millage updates. Always confirm final numbers with your lender, insurer, and parish-specific records before committing to a purchase.

Use Scenarios

Parish comparison before home search

Hold financing assumptions constant and swap parish tax rates to compare baseline affordability across locations before you narrow neighborhoods.

Insurance stress test for coastal exposure

Run multiple home and flood insurance inputs to understand how premium changes affect your monthly payment and reserve requirements.

PMI and down-payment decision planning

Evaluate whether increasing down payment or accepting PMI is more practical for your target monthly budget and short-term cash position.

Formula Explanation

Mortgage principal and interest

P&I = L x [r(1+r)^n] / [(1+r)^n - 1]

L is loan amount, r is monthly rate, and n is loan months. When rate is 0, the model falls back to linear principal amortization.

Total monthly housing payment

Total = P&I + property tax/12 + home insurance/12 + flood insurance/12 + PMI + HOA

This combines financing and recurring ownership costs into one planning number. It does not include maintenance, utilities, transaction fees, or future reassessment uncertainty.

Interpretation metrics

Five-year equity = down payment + principal repaid in the first 60 months.
Non-principal share shows how much of monthly cost comes from tax, insurance, PMI, and HOA.
Tax delta compares your parish input with national 1.10% and Texas 1.60% baselines.

Example Cases

Case 1: FHA starter in Orleans Parish

Inputs: Home price $280,000, down payment $9,800 (3.5%), 6.75% for 30 years, tax 0.25%, home insurance $3,200/year, flood insurance $1,800/year, PMI $150/month.

Computed results: Total monthly payment $2,377.51 (P&I $1,752.51, tax $58.33, insurance + flood $416.67, PMI $150), total interest $360,703.60, five-year equity $26,347.83.

Interpretation: Even with low parish tax, insurance and PMI together add $566.67/month, so non-principal costs remain material for early-stage buyers.

Decision hint: Before locking a rate, compare insurer quotes and down-payment tiers, because premium and PMI moves can shift affordability as much as modest rate changes.

Case 2: Conventional 20% in St. Tammany

Inputs: Home price $360,000, down payment $72,000 (20%), 6.4% for 30 years, tax 0.65%, home insurance $2,500/year, flood insurance $1,100/year, HOA $65/month, no PMI.

Computed results: Total monthly payment $2,361.46 (P&I $1,801.46, tax $195.00, insurance + flood $300.00, HOA $65), total interest $360,525.60, five-year equity $90,712.59.

Interpretation: Monthly cost is slightly lower than Case 1 by $16.05 despite a higher home price, mainly because 20% down removes PMI and improves early equity accumulation.

Decision hint: If cash reserves allow, evaluate whether a higher down payment can reduce recurring housing friction and strengthen refinance flexibility in years 3-5.

Case 3: Baton Rouge higher-tax profile

Inputs: Home price $325,000, down payment $65,000 (20%), 6.5% for 30 years, tax 1.89%, home insurance $2,600/year, flood insurance $900/year, HOA $80/month.

Computed results: Total monthly payment $2,526.93 (P&I $1,643.38, tax $511.88, insurance + flood $291.67, HOA $80), total interest $331,616.80, five-year equity $81,611.46.

Interpretation: This payment is $165.47 above Case 2, with parish tax alone contributing about 20.26% of monthly cost and running $213.96/month above the 1.10% national tax baseline.

Decision hint: For cross-parish relocation decisions, keep financing fixed and isolate tax and insurance deltas first; location-driven overhead can dominate rate differences.

Boundary Conditions

Input ranges are constrained for planning practicality and do not represent all lender policies.

The model assumes fixed-rate amortization; adjustable-rate resets are outside this calculator.

Property-tax and insurance assumptions are user provided and may differ from final escrow numbers.

Equity output excludes market appreciation, depreciation, refinance costs, and selling expenses.

Flood-zone status, deductible choices, and wind/hail coverage can alter premium outcomes.

Use this tool for educational planning only, not as a substitute for licensed professional advice.

Practical Workflow

Start with a realistic home-price and down-payment target based on your cash reserves.
Set financing assumptions from lender pre-qualification rather than headline average rates.
Enter parish tax and insurance assumptions from local quotes, then run low/base/high scenarios.
Review non-principal share to see whether tax and insurance are crowding your monthly budget.
Use five-year equity and total interest outputs to compare alternative down-payment strategies.

Sources & References

Consumer Financial Protection Bureau - Mortgage Basics - Definition and borrower-education context for mortgage structure and payment terms.
Consumer Financial Protection Bureau - Loan Estimate Guide - Reference for early closing-cost and escrow transparency before final loan commitment.
Freddie Mac - Primary Mortgage Market Survey - Rate-benchmark context for scenario assumptions in fixed-rate planning.
FEMA - Flood Maps - Flood-risk mapping context supporting flood-insurance scenario decisions.
Louisiana Housing Corporation - State homebuyer-program reference for assistance and eligibility planning.
Federal Reserve - Monetary Policy - Rate-environment context for mortgage scenario stress testing and financing assumptions.

Frequently Asked Questions

Why does this calculator separate home insurance and flood insurance?

Louisiana buyers often face both policies. Standard homeowners coverage and flood coverage are priced differently, and flood insurance may be mandatory in Special Flood Hazard Areas. Separating them improves budgeting and prevents underestimating monthly housing cost.

How should I choose a parish property-tax rate?

Use a recent effective rate from the parish you are evaluating, then test one lower and one higher scenario. Effective rates can vary by homestead eligibility, assessment profile, and local millage decisions, so scenario testing is safer than one-point estimates.

Can I rely on this as a final loan approval estimate?

No. Lenders can apply different credit overlays, escrow practices, fee structures, and insurance requirements. This tool is for planning and comparison, not underwriting approval.

What does the five-year equity number represent?

It combines your initial down payment and principal repaid during the first 60 months. It does not include home price appreciation, renovation impact, selling costs, or refinancing effects.

If my down payment is below 20%, must PMI always be included?

Conventional loans commonly require PMI below 20% down, but exact rules vary by product, risk tier, and lender. Use the PMI field to run conservative and optimistic scenarios while comparing offers.

How can I use this for a relocation decision inside Louisiana?

Hold home price and financing assumptions constant, then change parish tax rate and insurance values to compare monthly burden by location. This helps isolate geographic cost drivers before shopping specific properties.