NI
Abbreviation with 5 meanings
| Stands for | National Insurance |
|---|---|
| Meanings | 5 |
| Categories | Government & Politics, Geography & Places, Science & Engineering, Business & Finance |
| Also written | Ni |
NI has five meanings. The most common are National Insurance (UK government) and Northern Ireland (country name); it can also stand for Nickel, Nicaragua and Net income.
Meanings of NI at a glance
| # | NI stands for | Context |
|---|---|---|
| 1 | National Insurance | Government & Politics › UK Government |
| 2 | Northern Ireland | Geography & Places › Country Name |
| 3 | Nickel | Science & Engineering › Chemical Element |
| 4 | Nicaragua | Geography & Places › Country Code |
| 5 | Net income | Business & Finance › Accounting |
1. National Insurance
Government & Politics · UK Government Abbreviations · also used in business
UK system of contributions paid by employees, employers and the self-employed on earnings, which funds the State Pension and other contributory benefits and part of the NHS. Contributions are deducted from pay alongside income tax.
Example: Her payslip shows £186 deducted for NI this month.
National Insurance was introduced in 1911 by David Lloyd George and expanded in 1948 into the postwar welfare state. The main employee rate was cut to 8 percent in 2024, while employers' contributions rose to 15 percent in April 2025. In geography and politics, NI also means Northern Ireland.
2. Northern Ireland
Geography & Places · Country Name Abbreviations
Part of the United Kingdom since the partition of Ireland in 1921, made up of six counties in the northeast of the island, with Belfast as its capital. NI is common in UK government, business and media, as in NI Water and BBC NI.
Example: Prices for NI customers include VAT at the UK rate.
Northern Ireland has its own devolved Assembly at Stormont and kept special EU single-market arrangements for goods after Brexit under the Windsor Framework. Postcodes begin BT. NI is also Nicaragua's ISO code and, in the UK, National Insurance.
3. Nickel (Ni)
Science & Engineering · Chemical Element Abbreviations
Nickel, element 28, resists corrosion and is mostly used in stainless steel, while a growing share goes into the cathodes of high-energy electric vehicle batteries. It is one of the few elements that are magnetic at room temperature. The US five-cent coin called a nickel is actually 75% copper and only 25% nickel.
Example: After a positive patch test, the dermatologist advised buying only earrings labeled Ni-free.
Axel Fredrik Cronstedt isolated nickel in 1751 from an ore German miners called Kupfernickel, roughly "copper demon" or "Old Nick's copper," because it looked like copper ore but yielded none. Iron meteorites contain substantial nickel, and Earth's core is thought to be an iron-nickel alloy. Nickel allergy is among the most common causes of contact dermatitis.
4. Nicaragua
Geography & Places · Country Code Abbreviations
Nicaragua, the largest country in Central America, has Managua as its capital and NIC as its alpha-3 code. Lake Nicaragua is the largest lake in Central America and home to freshwater sharks.
Example: Coffee cooperatives in NI export mostly to the United States.
In UK usage NI means Northern Ireland and National Insurance. The córdoba is named after the Spanish founder of Granada and León.
5. Net income
Business & Finance · Accounting Abbreviations
Bottom-line profit after all expenses, interest, taxes and other items, often called net earnings or simply "the bottom line." It is the starting point of the indirect cash flow statement and the numerator of earnings per share.
Example: NI attributable to common shareholders was $410 million, or $2.05 per diluted share.
Net income can be negative, in which case it is a net loss. The US GAAP income statement shows net income attributable to the parent separately from any noncontrolling interest. In the UK, NI more commonly means National Insurance or Northern Ireland.
Related abbreviations
More UK government abbreviations
- MSP – Member of the Scottish Parliament
- NCA – National Crime Agency
- NCSC – National Cyber Security Centre
- NHS – National Health Service
- NICE – National Institute for Health and Care Excellence
- NINO – National Insurance number
- No. 10 – 10 Downing Street
- OBE – Officer of the Order of the British Empire
See all 91 UK government abbreviations →