I don't think so. I recently had a property in which the Household Charge was mistakenly listed as unpaid on the LPT system and my recollection is that the total amount due remained €200 with no additional interest unlike the LPT for subsequent years which was unpaid (due to a deferral) and on which interest has accrued. Maybe just give the LPT helpline a call to clarify/confirm - I found them very helpful.