15 free tools for the financial decisions that cross borders, courtrooms, and complexity thresholds — from alimony and child support to UK stamp duty, Canadian RRSP, Mexico IVA, expat tax exclusions, lottery payouts, gold valuations, and beyond.
⚖️ Family Law🌍 International Tax💰 Lottery & Windfalls🏅 Precious Metals🌿 Carbon Offsets
15
Free International & Legal Finance Tools
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State Law & IRS Aligned
Family law tools reflect current state-specific child support and alimony guidelines. Tax tools use current IRS, HMRC, CRA, and ATO rate tables.
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Multi-Country Coverage
Tools cover U.S., UK, Canada, Australia, and Mexico using each country’s current official tax rates, thresholds, and regulatory formulas.
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Fully Private
Every calculation runs locally in your browser. No legal or financial data you enter is ever stored or transmitted to our servers.
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Always Free
No registration, no attorney referrals, no upsells. All 15 tools are permanently free — use them as many times as you need.
How to Calculate US Legal Settlements, Child Support, & Expat Taxes
Most financial calculators handle mortgages, budgets, and compound interest. But a meaningful share of America’s most financially consequential decisions live at the intersection of law, international borders, and niche financial instruments — and those decisions are rarely served by generic tools. What does a $450,000 divorce settlement actually leave you with after the attorney’s contingency fee? How much of your Powerball jackpot survives federal and state taxes in your state? What does your $75,000 U.S. salary actually net in take-home pay if you are working on a UK PAYE contract? These are not hypothetical edge cases. They are the real, high-stakes financial moments that affect millions of Americans and internationally-connected individuals every year.
The 15 tools in this hub cover five distinct domains: U.S. family law finance (alimony, child support, legal contingency fees), windfall and windfall taxation (lottery lump sum vs. annuity), international taxation (U.S. expat FEIE, UK PAYE, UK SDLT, Canada RRSP, Mexico IVA, Mexico AFORE, Australia stamp duty), currency and alternative assets (forex, precious metals), and economic context (inflation-adjusted historical prices, corporate carbon offset costs). Each tool is built to produce an actionable number, not a general explanation.
$126,500
2025 U.S. Foreign Earned Income Exclusion for eligible expats
33–40%
Typical U.S. attorney contingency fee on settlements
50–60%
Lottery lump sum as % of advertised jackpot (before taxes)
28%
Max U.S. capital gains tax rate on gold & silver (collectibles)
US Family Law: Alimony & Child Support
Alimony, child support, and legal contingency fees are among the most financially impactful numbers in a person’s life — yet they are almost never calculated correctly by either party until they walk into a courtroom.
US Expat Taxes & International Real Estate
U.S. expats, cross-border workers, and foreign property buyers face a maze of country-specific tax rules — FEIE, UK PAYE, SDLT, RRSP limits, IVA, AFORE, and Australian transfer duty — that general calculators never address.
Lottery Payouts & Settlement Contingency Fees
Gold, silver, currency exchange, carbon offsets, lottery windfalls, and inflation-adjusted historical prices — niche but critical calculations that sit at the edge of conventional financial planning.
The US Foreign Earned Income Exclusion (FEIE) Explained
The United States is one of only two countries in the world — alongside Eritrea — that taxes its citizens on worldwide income regardless of where they live. A U.S. citizen working in London, Dubai, or Singapore must file a U.S. tax return every year. Most expats eventually learn about the Foreign Earned Income Exclusion, which allows them to exclude up to $126,500 (2025) of foreign wages from U.S. federal income tax. What many miss: the FEIE does not exclude self-employment tax, it does not apply to passive income (interest, dividends, rental income), and income above the exclusion threshold is still subject to U.S. tax — potentially at a steep marginal rate after the “stacking” rules apply. Our Expatriate FEIE Calculator models your exact exclusion amount and residual U.S. tax liability based on your income type, country, and test method.
US Lottery Payouts: Lump Sum vs. Annuity After Taxes
When a major U.S. lottery jackpot is advertised as $1 billion, the reality of what a winner actually receives is drastically different. The lump sum option is approximately 50–60% of the advertised jackpot — about $483 million on a $1 billion prize. After federal income tax at the top 37% rate, that becomes approximately $304 million. After the winner’s state income tax (ranging from 0% in Florida and Texas to 13.3% in California), the take-home figure may be as low as $250–$270 million on a headline $1 billion prize. The annuity option, by contrast, pays the full advertised $1 billion over 30 years with 5% annual increases — but delays gratification and locks you into the payment schedule. Our Lottery Payout Calculator models both options after all applicable taxes for your specific state.
Personal Injury Settlements: Calculating Attorney Contingency Fees
Most personal injury, workers’ compensation, and civil lawsuit plaintiffs are surprised to discover how large the gap is between their gross settlement and their net proceeds. A 33% contingency fee on a $300,000 settlement immediately reduces your take to $201,000. Litigation expenses — expert witnesses, medical record costs, court filing fees, deposition costs — are typically deducted separately and can add another $20,000–$50,000 in a complex case. Then federal and, in some cases, state income taxes apply to certain settlement components (punitive damages, lost wages reimbursement, and non-physical-injury damages are taxable; compensation for physical injuries is not). Our Legal Settlement Contingency Fee Calculator walks through each layer so you understand your actual net recovery before signing anything.
Full Tool Directory
Directory of 15 Free US Legal, Expat & Forex Calculators
Organized into five categories — find the right tool for your exact situation.
⚖️ U.S. Family Law & Legal Finance
Family Law⚖️ Divorce Planning
Alimony & Spousal Support Calculator
Estimate monthly spousal support using state-specific guidelines. Inputs both spouses’ gross income, marriage length, marital standard of living, and custody arrangement. Covers duration estimates for short, medium, and long-term marriages across all 50 states.
Calculate child support using your state’s model — Income Shares (most states) or Percentage of Income (Texas, Wisconsin, others). Accounts for custody split, health insurance premiums, childcare costs, and other extraordinary expenses per state guidelines.
Calculate your true net settlement proceeds after attorney contingency fees (33% pre-trial, 40% at trial), deducted litigation expenses, and applicable federal taxes on non-excludable settlement components. Shows the gross-to-net breakdown clearly before you settle.
Calculate your actual after-tax lottery winnings for both lump sum and annuity options. Applies the federal 37% top rate plus your state’s income tax rate. Models 30-year annuity payments with 5% annual increases and shows the investment return needed for the lump sum to outperform.
Expatriate Foreign Earned Income Exclusion Calculator
Calculate your 2025 FEIE exclusion amount and residual U.S. tax liability. Handles Physical Presence Test and Bona Fide Residence Test qualification, Housing Exclusion add-on, income stacking rules, and self-employment tax obligations that the FEIE does not eliminate.
Convert any amount between major world currencies using current interbank exchange rates. Shows the spread cost versus the mid-market rate for banks, airport kiosks, and online transfer services — essential for large international transfers where a 1% rate difference means thousands of dollars.
Convert any dollar amount from any year between 1913 and present to its inflation-adjusted equivalent using official BLS CPI data. Essential for legal settlements requiring historical value adjustments, wage comparisons across decades, and understanding real versus nominal economic growth.
Calculate UK take-home pay from any gross salary using current HMRC income tax bands (20% / 40% / 45%) and National Insurance rates. Covers England, Wales, and Scottish rate bands. Handles Personal Allowance tapering above £100,000 and the effective 60% marginal tax trap between £100,000–£125,140.
Calculate Stamp Duty Land Tax for any property purchase in England and Northern Ireland using current 2025 tiered rates. Applies first-time buyer relief (no SDLT on first £425,000), additional property surcharge (3%), and non-UK resident surcharge (2%) where applicable.
Calculate your 2025 RRSP contribution limit (18% of prior year earned income, max CAD $31,560), your available carry-forward room, and the immediate tax refund your contribution generates at your federal and provincial marginal rate. Also models long-term tax-deferred growth versus a non-registered account.
Calculate Mexico’s Impuesto al Valor Agregado (IVA) at the standard 16% rate or the northern border reduced rate of 8%. Add or remove IVA from any transaction amount. Identifies which goods and services are zero-rated or exempt under Mexican tax law — essential for cross-border business and e-commerce sellers.
Project your Mexican AFORE retirement balance based on current salary, age, years to retirement, and SIEFORE investment performance. Reflects the 2023 pension reform contribution increase to ~15% of salary and models the gap between AFORE proceeds and pension requirements under IMSS and ISSSTE rules.
🇦🇺🏅 Australia, Precious Metals & Alternative Finance
Australia🦘 All States
Australia Stamp Duty Calculator
Calculate property transfer duty for all six Australian states (NSW, VIC, QLD, WA, SA, TAS) and the ACT. Applies first home buyer concessions, foreign purchaser surcharges (7–8%), and off-the-plan purchase concessions. Covers both residential and investment property purchases with current 2025 rate tables.
Calculate the melt value of any gold or silver item by weight, purity, and current spot price. Supports all gold karats (10k, 14k, 18k, 22k, 24k), sterling and fine silver, and weight units (grams, troy ounces, pennyweights). Also shows U.S. capital gains tax implications at the 28% collectibles rate.
Estimate your company’s annual voluntary carbon offset cost based on total operational emissions (Scope 1, 2, and 3 inputs), target offset percentage, and preferred project type (nature-based, technology, renewable energy). Benchmarks costs against voluntary market rates (Gold Standard vs. VCS) and mandatory compliance markets.
24 direct answers covering family law finance, expat taxes, international property, precious metals, and more.
Alimony is not calculated using a single national formula — it varies significantly by state. Most courts consider the length of the marriage, each spouse’s income and earning capacity, the marital standard of living, and financial need. Some states use income-share percentage formulas; others leave it entirely to judicial discretion. Our Alimony & Spousal Support Calculator applies common state-specific guidelines to estimate a monthly support range for your situation.
The U.S. uses two primary child support models: Income Shares (used by most states, combines both parents’ income) and Percentage of Income (used in Texas, Wisconsin, and others — a fixed percentage of the non-custodial parent’s net income). Under Texas guidelines, that is 20% for one child, 25% for two, 30% for three. Custody split, childcare costs, and health insurance premiums all adjust the base calculation. Our U.S. Child Support Payment Estimator applies your state’s specific model and tables.
A contingency fee is a percentage of the settlement paid to an attorney only if the case is won. Standard rates: 33% for pre-trial settlements and 40% for cases that go to trial or appeal. On a $300,000 settlement at 33%, your attorney receives $99,000, leaving $201,000 before litigation expenses (expert fees, filing costs, medical records). Some states cap contingency fees by statute in medical malpractice and other specialized cases.
The lump sum is approximately 50–60% of the advertised jackpot before taxes. After federal tax (37%) and state income tax, a $1 billion prize yields roughly $250–$285 million as a lump sum. The annuity pays the full $1 billion over 30 years with 5% annual increases. If you can consistently earn more than 5% annually after taxes on invested capital, the lump sum wins mathematically. For winners without investment discipline, the annuity protects against rapid wealth depletion.
The 2025 FEIE amount is $126,500. To qualify, you must meet either the Physical Presence Test (330 full days outside the U.S. in any 12-month period) or the Bona Fide Residence Test (established resident of a foreign country for a full tax year). Critical caveat: the FEIE does not exempt self-employment tax, does not apply to passive income, and income above the threshold is still taxable — often at steep rates due to “stacking” rules that place excess income in high brackets.
PAYE (Pay As You Earn) collects UK income tax and National Insurance directly from wages. 2024/25 rates: 0% Personal Allowance on first £12,570; 20% Basic Rate on £12,571–£50,270; 40% Higher Rate on £50,271–£125,140; 45% Additional Rate above £125,140. National Insurance adds 8% on earnings between £12,570 and £50,270, and 2% above that. A particularly punishing feature: income between £100,000–£125,140 faces an effective 60% marginal rate due to Personal Allowance tapering.
SDLT is a tiered tax on property purchases in England and Northern Ireland. 2025 rates: 0% up to £250,000; 5% on £250,001–£925,000; 10% on £925,001–£1.5 million; 12% above £1.5 million. First-time buyers pay no SDLT on the first £425,000. Additional property purchases carry a 3% surcharge on every tier. Scotland uses LBTT and Wales uses LTT with their own rate structures. Our UK SDLT Calculator covers all scenarios including additional property and non-resident surcharges.
A Registered Retirement Savings Plan (RRSP) is Canada’s primary tax-deferred retirement account. Contributions are tax-deductible and investments grow tax-free until withdrawal. The 2025 annual contribution limit is 18% of prior year earned income up to CAD $31,560. Unused room carries forward indefinitely. Contributions must stop at age 71 when the account converts to a RRIF. At your marginal federal + provincial rate, an RRSP contribution can generate a tax refund of 43–53% of the contribution amount for higher-income Canadians.
IVA (Impuesto al Valor Agregado) is Mexico’s VAT. The standard rate is 16% on most goods and services throughout Mexico. In the northern border zone, a reduced 8% rate applies to encourage economic activity near the U.S. border. Certain items are zero-rated (unprocessed food, books, medicine) or exempt (healthcare, financial services, public transportation). Businesses must collect IVA on taxable sales and can claim IVA credits on business inputs — our Mexico IVA Calculator handles both add-on and extract calculations at both rates.
AFORE (Administradora de Fondos para el Retiro) is Mexico’s mandatory individual retirement savings system. Employer, employee, and government contributions total approximately 15% of salary following the 2023 pension reform. Workers choose an AFORE administrator and funds are invested in age-based SIEFORE portfolios. Retirement benefits are calculated based on accumulated balance, not a defined benefit formula — making early enrollment and voluntary contributions critical for adequate retirement income. Our Mexico AFORE Calculator projects your balance to retirement based on current salary, age, and assumed SIEFORE returns.
Australia’s property transfer duty (stamp duty) is a state-level tax that varies significantly by state and purchase price. In New South Wales, a $800,000 property attracts approximately $31,335 in stamp duty. In Victoria, the same property costs approximately $43,070. First home buyers receive full exemptions below certain thresholds — $650,000 in NSW and $600,000 in VIC. Foreign purchasers pay a surcharge of 7–8% in most states on top of standard rates. Our Australia Stamp Duty Calculator covers all six states and the ACT with current 2025 rate tables.
Gold and silver melt value = (Weight in grams ÷ 31.1035) × Spot price per troy ounce × Purity decimal. Gold purity: 24k = 0.999, 22k = 0.916, 18k = 0.750, 14k = 0.583, 10k = 0.417. Silver purity: .999 fine = 0.999, sterling = 0.925, coin silver = 0.900. Example: a 10-gram 18k gold item at a $2,000/troy oz spot price is worth (10 ÷ 31.1035) × $2,000 × 0.750 = approximately $483. Our Precious Metals Calculator handles all purity grades, weight units, and includes the U.S. 28% collectibles capital gains tax estimate.
A carbon offset represents the verified reduction or removal of one metric tonne of CO₂ equivalent (tCO₂e). Companies purchase offsets to compensate for emissions they cannot yet eliminate. Voluntary market prices: nature-based projects (reforestation, soil carbon) cost $10–$30/tonne; technology-based solutions (direct air capture) cost $100–$600/tonne. The two leading quality standards are Gold Standard and Verra’s VCS. Cheap unverified offsets at $1–$5/tonne frequently fail additionality and permanence tests. Our Carbon Offset Calculator estimates annual offset cost based on your Scope 1, 2, and 3 emissions inputs.
Use the BLS Consumer Price Index (CPI) formula: Adjusted Price = Historical Price × (Current CPI ÷ Historical CPI). For example, $100 in 1970 (CPI: 38.8) equals approximately $791 in 2025 (CPI: ~310). This is essential for legal settlements requiring inflation adjustment, wage comparisons across generations, understanding real investment returns, and insurance valuations for historical property. Our Inflation-Adjusted Historical Price Calculator provides CPI-based conversions for any year from 1913 to present using official BLS data.
The spot rate is the current interbank exchange rate for immediate settlement — the “true” mid-market rate you see on Google or Reuters. When you exchange currency at a bank, airport kiosk, or PayPal, they apply a spread (markup) of 2–5% above the interbank rate. Online fintech platforms like Wise charge 0.3–1%. On a $500,000 international property purchase, a 1% spread difference represents $5,000 in cost. For large transfers, comparing multiple providers using the mid-market rate as your benchmark is essential. Our Currency Exchange Calculator shows the spread cost for any transfer amount.
Alimony duration depends on marriage length and state law. Short marriages (under 5 years): temporary support for 1–3 years. Medium marriages (5–20 years): rehabilitative support for a fraction of the marriage length. Long marriages (20+ years): potentially permanent support in some states. Alimony can typically be modified on a substantial change in circumstances — job loss, significant income change, or the recipient’s remarriage, which terminates alimony in most states. Cohabitation with a new partner may also trigger modification proceedings in many jurisdictions.
The Physical Presence Test requires spending at least 330 full 24-hour days outside the United States in any 12-consecutive-month period. Unlike the Bona Fide Residence Test, you do not need to establish legal residence in a foreign country — you only need to be physically present abroad. Travel days passing through the U.S. do not count as foreign days. The 12-month period can be any 12 consecutive months (not only a calendar year), giving expats flexibility in structuring overseas presence to qualify for the maximum $126,500 exclusion in 2025.
Not always — it depends entirely on investment discipline and tax planning. The lump sum for a $1 billion Powerball prize is approximately $483 million before tax — around $285 million after federal and state taxes for a single filer in a moderate-tax state. The annuity pays the full $1 billion over 30 years with 5% annual payment increases. If you can consistently earn more than 5% annually after taxes, the lump sum wins mathematically. For most winners without investment experience, the annuity is safer and prevents the rapid wealth depletion that affects the majority of large jackpot winners within a decade of winning.
An RRSP gives you a tax deduction now but taxes withdrawals as ordinary income — ideal for those in high tax brackets during working years who expect lower income in retirement. A TFSA (Tax-Free Savings Account) gives no upfront deduction but all growth and withdrawals are permanently tax-free — ideal for those in lower brackets or who want flexible tax-free access at any age. The 2025 TFSA annual limit is CAD $7,000 (cumulative room since 2009: $95,000). Many Canadians benefit from contributing to both accounts simultaneously, prioritizing RRSP for its higher immediate tax refund at peak earning years.
Beyond the FEIE, U.S. expats must consider: the Foreign Housing Exclusion (covers excess housing costs above a base amount — $20,258 in 2025); the Foreign Tax Credit for income above the FEIE threshold; FBAR filing (FinCEN 114) for foreign bank accounts exceeding $10,000 at any point during the year; and FATCA Form 8938 reporting for foreign financial assets above $200,000 for those residing abroad ($50,000 for U.S. residents). Self-employment income is never exempt from the 15.3% U.S. self-employment tax regardless of FEIE eligibility — a critical and frequently missed obligation.
The IRS classifies gold, silver, platinum, and palladium as collectibles. Long-term capital gains on collectibles are taxed at a maximum 28% rate — significantly higher than the 0%, 15%, or 20% rates that apply to stocks and bonds held over a year. Short-term gains (held under one year) are taxed as ordinary income at your marginal rate. This applies to physical bullion, coins, and ETFs that directly hold physical metals (GLD, SLV). Gold mining stocks and futures ETFs are taxed at standard capital gains rates. The 28% collectibles rate makes holding period management especially important for precious metals investors.
The UK Personal Allowance is the income amount tax-free each year — £12,570 for 2024/25. However, for every £2 of adjusted net income above £100,000, the allowance reduces by £1. This creates an effective 60% marginal tax rate on income between £100,000 and £125,140 — one of the highest marginal rates in the developed world. Above £125,140 the allowance is fully eliminated. Pension contributions, Gift Aid donations, and salary sacrifice arrangements can reduce adjusted net income below £100,000 to restore the allowance and avoid the 60% trap entirely.
Yes. The United States is one of only two countries worldwide (along with Eritrea) that taxes its citizens on worldwide income regardless of residency. U.S. citizens and green card holders living abroad must file U.S. tax returns annually. However, the FEIE ($126,500 in 2025), the Foreign Housing Exclusion, and the Foreign Tax Credit significantly reduce or eliminate actual tax owed for most expats. The only path to permanently escaping U.S. worldwide taxation is formal renunciation of citizenship — which triggers an exit tax for individuals with net worth above $2 million or average annual net tax liability exceeding $201,000 over the prior 5 years.
A credible carbon offset must meet five criteria: additionality (the reduction would not have happened without offset revenue), permanence (the carbon stays sequestered long-term), measurability (verified by an independent third party), uniqueness (registered to prevent double-counting), and leakage protection (emissions are not simply displaced elsewhere). The two leading standards are Gold Standard (the most stringent, founded with WWF support) and Verra’s Verified Carbon Standard (the largest by volume). Cheap offsets at $1–$5/tonne typically fail multiple criteria. Corporate buyers paying $20–$50/tonne for Gold Standard credits are purchasing significantly more credible, audited emission reductions.
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David holds an MBA in Finance (UET Lahore) and an MSc (University of Karachi), with nearly 20 years of experience across finance, operations, and data management. He currently serves as Lab & CS Manager at Coats and is the founder of USFinanceCalculators.com — 200+ free US financial tools built to help Americans make smarter money decisions.
🎓 MBA Finance — UET Lahore🎓 MSc — University of Karachi🏭 Manager · Coats🧮 200+ Calculators📅 Publishing Since 2018