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Blog & Resources

Browse calculator guides and reference articles to support accurate inputs and results.

Latest Articles

Featured
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Mortgages

Understanding Mortgage Affordability: The Complete 2025 Guide

Learn how lenders calculate mortgage affordability, what DTI ratios mean, and how to maximize your buying power with our comprehensive guide to mortgage qualification.

By CalcDomain Team โ€ข January 15, 2025 โ€ข 12 min read Read More โ†’
Retirement

Roth IRA vs Traditional IRA: Which Is Right for You?

Compare the benefits of Roth and Traditional IRAs, including tax implications, contribution limits, and withdrawal rules to determine the best choice for your retirement strategy.

Jan 10, 2025 Read โ†’
Taxes

2025 Tax Planning: Key Deadlines & Strategies

Stay ahead of important tax deadlines and learn strategies to minimize your tax burden for the 2025 tax year, including deductions, credits, and retirement contributions.

Jan 5, 2025 Read โ†’
Investment

Calculating ROI: A Practical Guide for Investors

Master the fundamentals of ROI calculation, understand annualized returns, and learn how to compare different investment opportunities effectively.

Dec 28, 2024 Read โ†’
Personal Finance

The 50/30/20 Budget Rule: Does It Still Work?

Explore the popular 50/30/20 budgeting framework and learn how to adapt it to modern financial realities, including inflation and rising living costs.

Dec 20, 2024 Read โ†’
Real Estate

First-Time Home Buyer Programs: State-by-State Guide

Discover down payment assistance programs, tax credits, and special loan programs available to first-time home buyers across all 50 states.

Dec 15, 2024 Read โ†’
Credit

How Credit Scores Really Work in 2025

Demystify credit scores with our comprehensive breakdown of FICO and VantageScore models, including what factors matter most and how to improve your score.

Dec 8, 2024 Read โ†’

Calculator Guides & Tutorials

Step-by-step guides to help you get the most out of our calculators.

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Guide

How to Use the Mortgage Affordability Calculator

Complete walkthrough of our mortgage calculator, including how to interpret DTI ratios, what each input means, and how to use results for home shopping.

Read Guide โ†’
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Guide

Roth IRA Calculator: Maximizing Your Retirement

Learn how to project your Roth IRA balance, understand contribution limits, income phase-outs, and plan for a tax-free retirement.

Read Guide โ†’
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Guide

Loan Amortization: Reading Your Schedule

Understand amortization schedules, see how extra payments save interest, and learn strategies to pay off loans faster.

Read Guide โ†’
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Guide

VAT Calculator: Business Applications

Master VAT calculations for invoicing, understand reverse charge mechanisms, and handle multi-rate scenarios.

Read Guide โ†’
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Guide

Investment ROI: Beyond the Basics

Advanced ROI calculation techniques including time-weighted returns, IRR, and comparing investment performance across asset classes.

Read Guide โ†’
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Guide

Health Calculators: Interpreting Your Results

Understand BMI, body fat percentage, calorie needs, and other health metrics with guidance on what the numbers really mean.

Read Guide โ†’

Curated Resources

Links to authoritative sources, tools, and reference materials.

๐Ÿ›๏ธ Official Government Resources

Internal Revenue Service (IRS)

Tax information, forms, publications, and refund status.

Visit IRS.gov โ†’

Consumer Financial Protection Bureau

Consumer protection, financial education, complaint filing.

Visit CFPB.gov โ†’

HUD - U.S. Dept of Housing

FHA loans, housing counseling, fair housing resources.

Visit HUD.gov โ†’

Veterans Affairs (VA)

VA home loans, benefits, healthcare, and services.

Visit VA.gov โ†’

Social Security Administration

Retirement benefits, disability, Medicare enrollment.

Visit SSA.gov โ†’

Federal Reserve

Economic data, monetary policy, financial education.

Visit FederalReserve.gov โ†’

๐Ÿ’ผ Financial Tools & Platforms

Annual Credit Report

Free credit reports from all three bureaus (official site).

Get Free Report โ†’

Fannie Mae

Mortgage resources, homebuyer education, eligibility tools.

Visit Fannie Mae โ†’

Freddie Mac

Mortgage rates, loan products, homeownership guides.

Visit Freddie Mac โ†’

MyMoney.gov

Financial education from the U.S. Treasury Department.

Visit MyMoney.gov โ†’

๐Ÿ“š Educational Resources

a third-party source

Comprehensive financial education, definitions, and tutorials.

Khan Academy - Finance

Free courses on personal finance, investing, and economics.

NAPFA - Financial Advisor Search

Find fee-only financial advisors in your area.

Browse by Category

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Mortgages & Real Estate

Home buying, mortgage rates, affordability, refinancing

12 articles โ†’
๐ŸŒ…

Retirement Planning

IRAs, 401(k)s, pensions, Social Security, withdrawal strategies

15 articles โ†’
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Taxes & Tax Planning

Deductions, credits, tax strategies, filing tips

10 articles โ†’
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Investment & Wealth

Stocks, bonds, ROI, portfolio management, diversification

8 articles โ†’
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Personal Finance

Budgeting, saving, debt management, emergency funds

18 articles โ†’
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Health & Wellness

BMI, calorie calculators, fitness metrics, health insurance

6 articles โ†’
๐Ÿ’ผ

Business & Entrepreneurs

VAT, business loans, cash flow, profit margins

7 articles โ†’
๐Ÿ’ณ

Credit & Debt

Credit scores, debt payoff, consolidation, credit cards

9 articles โ†’
๐ŸŽ“

Education & Student Loans

Student loan calculators, repayment plans, forgiveness

5 articles โ†’

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Formulas

This section shows the formulas used by the calculator engine, plus variable definitions and units.

No formulas provided in audit spec.

Variables and units
  • P = principal (loan amount) (currency)
  • r = periodic interest rate (annual rate รท payments per year) (1)
  • n = total number of payments (years ร— payments per year) (count)
  • M = periodic payment for principal + interest (currency)
  • T = property tax (annual or monthly depending on input) (currency)
  • I = homeowners insurance (annual or monthly depending on input) (currency)
Citations

Sources (authoritative):

Changelog
  • Version: 0.1.0-draft ยท 2026-01-19
  • 0.1.0-draft ยท 2026-01-19
    • Initial audit spec draft generated from HTML extraction (review required).
    • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
    • Confirm sources are authoritative and relevant to the calculator methodology.
  • Verification pending ยท Last code update: 2026-01-19
โš‘ Audit: Needs review โฑ Last Updated: 2026-01-19 โ„น Version 0.1.0-draft
Version 1.5.0