Mortgage Payment Balloon Estimator
This estimator calculates the regular periodic payment required by an amortization schedule and the remaining lump-sum balloon payment due at a shorter balloon term. It is intended to help borrowers and advisors compare payment levels and principal remaining at the balloon date.
Use the calculator for planning and comparison only. Results are approximate and depend on the accuracy of the inputs. See methodology and cautions below for assumptions, edge cases, and recommended verification steps.
Governance
Record fae5f5e39c55 • Reviewed by Fidamen Standards Committee
Inputs
Results
Periodic payment
-$3.47
Balloon (remaining) payment at term
$271,819.00
Total payments made until balloon date
-$208.33
Total interest paid until balloon date
-$28,389.33
| Output | Value | Unit |
|---|---|---|
| Periodic payment | -$3.47 | USD |
| Balloon (remaining) payment at term | $271,819.00 | USD |
| Total payments made until balloon date | -$208.33 | USD |
| Total interest paid until balloon date | -$28,389.33 | USD |
Visualization
Methodology
The tool uses standard amortization math. It assumes a fixed nominal annual interest rate, level periodic payments computed on the amortization schedule, and that the balloon payment equals the outstanding principal after the specified number of payments.
Rounding is applied only at the displayed result level; internal calculations use the full precision available in the execution environment. For zero interest or extremely small rates, behavior may require special handling; verify results if the rate is zero or near-zero.
F.A.Q.
What if the balloon term equals the amortization period?
If balloon term equals the amortization period, the remaining balance will be zero and the balloon payment is effectively zero because the loan has been fully amortized by that time.
How does payment frequency affect results?
Changing payments per year adjusts the periodic interest rate and number of payments. More frequent payments typically reduce interest per period but do not change the nominal annual rate.
Does this account for fees, taxes, or escrow?
No. This estimator calculates principal and interest only. Include separate line items for fees, escrows, prepayment penalties, or insurance when budgeting.
How accurate are the numbers?
The calculations follow standard financial formulas. Accuracy depends on input accuracy and the execution environment. For legally binding amounts, obtain an official loan payoff or amortization schedule from the lender.
Sources & citations
- National Institute of Standards and Technology (NIST) — https://www.nist.gov
- International Organization for Standardization (ISO) — https://www.iso.org
- Institute of Electrical and Electronics Engineers (IEEE) — https://www.ieee.org
- Occupational Safety and Health Administration (OSHA) — https://www.osha.gov
- CFPB — Understand Loan Options — https://www.consumerfinance.gov/owning-a-home/loan-options/
- CFPB — Explore Interest Rates — https://www.consumerfinance.gov/owning-a-home/explore-rates/
- Fannie Mae — Loan Terms Glossary — https://www.fanniemae.com/glossary
Further resources
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
Record ID: fae5f5e39c55What changed (latest)
v1.0.0 • 2025-11-14 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
What changed (latest)
v1.0.0 • 2025-11-14 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Engine
v1.0.0
Data
Baseline (no external datasets)
Content
v1.0.0
UI
v1.0.0
Governance
Last updated: Nov 14, 2025
Reviewed by: Fidamen Standards Committee (Review board)
Credentials: Internal QA
Risk level: low
Reviewer profile (entity)
Fidamen Standards Committee
Review board
Internal QA
Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person
Semantic versioning
- MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
- MINOR: New features or fields that do not change existing outputs for the same inputs.
- PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.
Review protocol
- Verify formulas and unit definitions against primary standards or datasets.
- Run golden-case regression suite and edge-case suite.
- Record reviewer sign-off with credentials and scope.
- Document assumptions, limitations, and jurisdiction applicability.
Assumptions & limitations
- Uses exact unit definitions from the Fidamen conversion library.
- Internal calculations use double precision; display rounding follows the unit's configured decimal places.
- Not a substitute for calibrated instruments in regulated contexts.
- Jurisdiction-specific rules may require official guidance.
Change log
v1.0.0 • 2025-11-14 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 586db2f10b2a