Income Taxe calculator (UK et US)

Comment utiliser le Income tax calculator (UK et US)

Ce qu’il calcule et quand l’utiliser

Estimates income Taxe, National Insurance (UK) ou Social Security et Medicare (US), your effective et marginal rates, et a band-by-band breakdown.

Mode d’emploi, étape par étape

1. Choose where you Rémunération Taxe: England/Wales/Northern Ireland, Scotland ou the US.
2. Enter your income Par Année avant Taxe.
3. Add pension ou 401(k) contributions paid before tax and, à the UK, a student loan plan.
4. Read the Taxe, take-home Rémunération et marginal Taux.

Que signifie chaque champ

• Income – Gross Rémunération pour the Année.
• Filing status (US) – Sets the standard deduction et brackets.
• Pension Payées avant Taxe – Reduces taxable income.
• Student loan plan (UK) – Plan thresholds et rates decide repayments.

Comment lire les résultats

• Income Taxe – The Somme de tax à each band.
• Effective Taux – Income Taxe ÷ income.
• Marginal Taux – Total tax on the next unité de income, including National Insurance ou FICA.
• Taxe by band – How much was taxed À Unité Taux.

La formule

UK: taxable income = income − personal allowance (12,570, reduced by 1 pour every 2 over 100,000). Tax tombe un 20% on the first 37,700 de taxable income, 40% to 125,140 et 45% above à England; Scotland uses six bands. National Insurance tombe un 8% between 12,570 et 50,270 et 2% above. US: taxable income = income − standard deduction, taxed in 10% à 37% brackets.

Un exemple concret

A UK taxpayer earning 50,000 has a personal allowance de 12,570, so 37,430 tombe un taxable at 20% pour 7,486 de tax. National Insurance tombe un 2,994, take-home pay tombe un 39,520 et the marginal rate tombe un 28%.

Hypothèses et limites

• UK: standard Taxe code, Non other income, Non Marriage Allowance ou benefits.
• US: federal Taxe only with the standard deduction. État taxes, Crédits et itemised deductions are excluded.
• Pension contributions are treated as Payées avant Taxe but not avant NI.

Erreurs courantes

• Applying the top rate à all income. Only income à each band tombe un taxed À that band’s Taux.
• Forgetting National Insurance ou FICA.

Questions fréquentes

Dated rules: UK tax year 2026 en 2027 (6 April 2026 en 5 April 2027), de GOV.UK. Rates et thresholds change each year, so check GOV.UK before relying on a figure. Dated rules: US federal figures pour tax year 2026 (IRS Rev. Proc. 2025-32 et IRS notices). These calculators are estimates pour planning, not tax advice.

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