The expenses are worth over €2000
Sinn Féin has uncovered 5 separate expenses it should have declared for the 2016 General Election campaign.
The party will now have to resubmit its returns to the Standards in Public Office Commission.
The expenses, worth over €2000, relate to six press conferences held in Dublin venues in 2016.
The party said it regrets the omissions.
The news comes following recent revelations that Minister for Public Expenditure Pascal Donohoe failed to declare expenses in the 2016 and 2020 election.

Fórsa Members Vote Overwhelmingly For Industrial Action Amid Pay Dispute
National Youth Council Calls On Government To Take Action To Curb Emigration
Man Dies After Violent Disorder Incident In Leopardstown Over The Weekend
New Scheme Allows Smaller Drug Offenders To Be Referred To HSE Rather Than Prosecuted
Dublin Airport Ranks As One Europe's Busiest Airports
Man (22) Appears In Court Charged Over A Violent Confrontation In Sandyford
Figures Reveal Kildare Town Primary School As Largest In The Country For Second Successive Year
Teenager In Critical Condition After E-Scooter Crash In Longford