英国国民保険計算
給与または自営業の利益にかかる年間、月間、週間の国民保険を計算します。
ブラウザ内で動作します。ファイルは端末の外に出ません。 確認方法を見る
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使い方
- 1項目を入力
数値を入力するか、必要なオプションを選びます。
- 2結果を見る
値を変えるとすぐに答えが更新されます。
- 3活用する
結果をコピーするか書き留めてください。何もどこにも送信されません。
About this tool
Enter a yearly salary or profit and choose employee (Class 1) or self-employed (Class 4). The calculator applies the main rate to earnings between the primary threshold and the upper limit and the additional rate above it. Rates and thresholds are for the 2026-27 tax year and can change. A guide only, check gov.uk for the official figures.
How it is worked out
Employees pay 8 percent on earnings between £12,570 and £50,270 a year and 2 percent above that. Self-employed people pay Class 4 contributions at 6 percent on profits between the same limits and 2 percent above. Employers pay 15 percent on a worker's earnings above £5,000, which is shown for comparison but is not taken from your pay.
Example
On a £45,000 salary an employee pays 8 percent of £32,430, which is about £2,594 a year or £216 a month.
Tips
National Insurance builds your State Pension record. If your pay is between the lower earnings limit and the threshold you can still get a qualifying year without paying.
計算例
With the boxes at their starting values (Yearly salary or profit (£): 45000; Type: Employee (Class 1)), the tool shows: Per month (£): 216.20; Per week (£): 49.89; Share of your pay: 5.8%; Employer's NI on top (£): 6,000; National Insurance per year (£): 2,594. Change any box to see your own numbers. The result updates as you type, and nothing leaves your browser.
最良の結果を得るためのヒント
結果を信頼する前にすべての項目を確認してください。数字がひとつ違うだけで答え全体が変わります。給与明細、請求書、証明書、契約書にある正確な数字を使い、計算した日付を控えておきましょう。税率、しきい値、ルールは随時変わるため、税金、手数料、法的な事柄については結果を概算とみなし、このページに記載された公式情報源で確認してください。シナリオは何度でも試せます。何も保存・送信されず、ページを再読み込みすると入力欄はクリアされます。
ポイント
よくある質問
Is National Insurance the same as income tax?
No. Income tax and National Insurance are separate. NI helps build your State Pension and some benefits.
Do I pay NI on a pension contribution?
Through workplace schemes that take pension from your pay before tax (salary sacrifice) you may pay less NI, but ordinary net pay arrangements do not reduce NI.
What changes for the self-employed?
Class 4 NI is 6 percent on profits in the main band. Class 2 is no longer compulsory, though a voluntary payment can fill gaps in a State Pension record.
Which year are the rates for?
The 2026-27 tax year, 6 April 2026 to 5 April 2027.