Income Impuesto calculator (UK y US)

Cómo usar la Income tax calculator (UK y US)

Qué calcula y cuándo usarla

Estimates income Impuesto, National Insurance (UK) o Social Security y Medicare (US), your effective y marginal rates, y a band-by-band breakdown.

Cómo usarla, paso a paso

1. Choose where you Paga Impuesto: England/Wales/Northern Ireland, Scotland o the US.
2. Enter your income Por Año antes Impuesto.
3. Add pension o 401(k) contributions paid before tax and, en the UK, a student loan plan.
4. Read the Impuesto, take-home Paga y marginal Tipo.

Qué significa cada dato

• Income – Gross Paga por the Año.
• Filing status (US) – Sets the standard deduction y brackets.
• Pension Pagadas antes Impuesto – Reduces taxable income.
• Student loan plan (UK) – Plan thresholds y rates decide repayments.

Cómo leer los resultados

• Income Impuesto – The Suma de tax en each band.
• Effective Tipo – Income Impuesto ÷ income.
• Marginal Tipo – Total tax on the next unidad de income, including National Insurance o FICA.
• Impuesto by band – How much was taxed A Cada uno Tipo.

La fórmula

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

Un ejemplo práctico

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

Supuestos y límites

• UK: standard Impuesto code, no other income, no Marriage Allowance o benefits.
• US: federal Impuesto only with the standard deduction. Estado taxes, Créditos y itemised deductions are excluded.
• Pension contributions are treated as Pagadas antes Impuesto but not antes NI.

Errores comunes

• Applying the top rate a all income. Only income en each band es taxed A that band’s Tipo.
• Forgetting National Insurance o FICA.

Preguntas frecuentes

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

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