IRS

• (US) IPA^(key): /ˈaɪ.ɑɹ.ɛs/

IRS

1. (US) Initialism of Internal Revenue Service.
   • 2021 November 9, Jeanne Sahadi, “If you use Venmo, PayPal or other payment apps this tax rule change may affect you”, in CNN‎^[1]:

     […] It is going to be up to the taxpayer, if they receive a 1099 in any form for a nontaxable event, such as splitting rent among roommates, splitting a dinner bill, or even selling something on eBay for less than you paid for it, to explain to the IRS that the 1099 was received for a non-taxable transaction,” said Mark Luscombe, principal analyst for tax publisher Wolters Kluwer Tax & Accounting.

   • 2025 May, “The One, Big, Beautiful Bill”, in United States House Committee on Ways & Means‎^[2], page 20:

     Current law does not allow individuals to contribute to an HSA if they utilize certain discounted health services at a health clinic at their worksite because the IRS views such services as a significant medical benefit, therefore incompatible with HSAs.

2. (India) Initialism of Indian Revenue Service.

IRS (countable and uncountable)

1. (aviation) Initialism of inertial reference system.

   Coordinate terms: INS, INU, IRU

2. (engineering) Initialism of Interface Requirements Specification.
3. (basketball) Initialism of instant replay system.

(Inertial Reference System):

• INS (inertial navigation system)
• INU (inertial navigation unit)
• IRU (inertial reference unit)

(Inertial Reference System):

• GPS (global positioning system)
• AHRS (attitude and heading reference system)

IRS (plural IRSs)

1. (finance) Initialism of interest rate swap.

• Sri, RSI, ISR, Sir., Isr., Sir, R.I.S., SIR, RIs, sir, SRI, R. I. S., RIS

Initialism of Imposto sobre o Rendimento de Pessoas Singulares.

IRS m

1. (Portugal) initialism of Imposto sobre o Rendimento de Pessoas Singulares (a personal income tax)

Borrowed from English IRS (“Internal Revenue Service”).

IRS m

1. Servicio de Impuestos Internos de los Estados Unidos; IRS.
   • 2025 June 7, Jeanne Sahadi, “El DOGE acaba de recibir luz verde para acceder a tus datos del Seguro Social. ¿Qué significa?”, in CNN en Español‎^[3]:

     Al igual que los sistemas de datos del IRS a los que el DOGE también ha solicitado acceso, los sistemas de la SSA son antiguos, complejos, interconectados y funcionan con un lenguaje de programación desarrollado hace décadas.

     (please add an English translation of this quotation)