The 8 pm next-day deadline
Every M50 crossing must be paid by 8 pm the next day. Pay via tag, video account, or one-off online / at PayZone outlets. Miss the deadline and the toll plus a €3 unpaid-toll charge is added; after 14 days that rises to €41.50 in total per crossing.
Wrong registration entered
A common winning ground: you paid in advance but entered the wrong plate. eFlow can match the payment to the correct crossing if you supply the payment reference and the actual plate. Submit a written appeal with the payment screenshot.
Vehicle sold or stolen before the crossing
If the vehicle was sold (V5 transfer completed and the new keeper notified) or stolen at the time of the toll, the fine is the new keeper's liability. Send eFlow proof of sale / Garda report and the fine is reassigned or cancelled.