Our Methodology

SpousalCalc.com publishes 250+ free calculators covering child support, alimony, property division, marriage finances, and family law across the US, UK, Canada, Australia, and New Zealand. Every calculator is built with accuracy and transparency as the highest priorities.

Data Sources

Every calculator is built on primary legal sources — not secondary articles or estimates. Our source hierarchy:

• Statutory text — We read the actual statute (e.g., California Family Code §4055, 750 ILCS 5/505, UK Child Support Act 1991) and implement the formula as written in law
• Official government calculators — Where a state or country publishes an official calculator, we verify our results match theirs (e.g., Texas OAG, California DCSS, UK CMS, Australia CSA)
• Published guideline tables — Child support schedules, tax brackets, and benefit rates come from official government publications, not third-party estimates
• Court rules and administrative orders — For states using judicial guidelines (e.g., Delaware Melson Formula, Massachusetts Guidelines), we follow the specific court-published methodology

How We Build Each Calculator

• Step 1: Legal research — Read the relevant statute, court rule, or administrative guideline. Identify the exact formula, income definitions, adjustments, and thresholds
• Step 2: Implementation — Code the formula in JavaScript with all deductions, credits, and adjustments. Each variable maps to a specific statutory provision
• Step 3: Verification — Cross-check results against official state calculators, published examples in court documents, or worked examples from legal treatises
• Step 4: Content — Write explanatory content that references specific statute sections, explains the formula, and provides a realistic worked example
• Step 5: Review — Internal review for accuracy, user experience, and completeness before publication

Accuracy Standards

Our calculators produce estimates, not exact legal determinations. Here's why results may differ from your actual case:

• Judicial discretion — Judges have wide latitude to deviate from guidelines. Our calculators show the guideline amount; courts may order more or less
• Complex income — Our Simple tier uses gross/net income approximations. Real cases may involve imputed income, business valuations, or non-recurring income that requires professional analysis
• State-specific nuances — Each state has unique deviations, exceptions, and local rules that cannot all be captured in an online tool
• Tax law changes — Tax brackets and rates change annually. We update to current-year rates, but there may be a brief lag when new rates take effect

For these reasons, we provide three tiers of depth — Simple (quick estimate), Advanced (more inputs and analysis), and Professional (full detail) — and always recommend consulting a qualified professional.

Update Process

• Annual updates — Tax brackets, child support schedules, benefit rates, and filing fees are updated at the start of each calendar year
• Law change monitoring — When states pass new family law legislation (e.g., Florida's 2023 alimony reform SB 1416, Washington's 2026 child support overhaul EHB 1014), we update the affected calculators as soon as the new law takes effect
• Continuous verification — We regularly cross-check our calculators against official state tools to catch discrepancies

What Our Calculators Are Not

SpousalCalc calculators are not:

• A substitute for legal advice from a licensed attorney
• A substitute for financial advice from a certified financial planner
• Official court calculations — only a judge can determine your actual obligation
• Tax advice — consult a CPA or tax attorney for tax-specific questions

Our tools are designed to help you understand your situation, prepare for conversations with professionals, and make informed decisions. See our full Disclaimer.

Privacy & Security

All calculations run entirely in your browser. No personal or financial data is transmitted to any server. We have no database of user data because we never collect it. See our Privacy Policy.

Contact & Corrections

Found an error? Have a suggestion? We take accuracy seriously. Contact us at [email protected] and we'll investigate and correct any verified issues promptly.