Seven-day warning on property tax
More than 50,000 householders who have still not paid their property tax have been given seven days to cough up before it is deducted from source.
Revenue Commissioners sent reminder letters to eligible property owners warning the money will be taken directly from their pay or pension if they do not respond.
Around 1.58 million local property tax returns have been filed so far, generating 175 million euro for the state.
In a statement, Revenue said the fact that there has never been a complete property register in the state means some reminder letters may have been sent in error.
But it urged homeowners not to ignore their letters, asking those who have received one and already paid the tax to contact it.
It said some reminders may have also been sent to people who do not own the property they live in.
They have been advised to inform officials of the owner, who is eligible.
"Don't ignore the letter," the statement said. "If you do, Revenue will instruct your employer or pension provider to deduct the amount of the estimate from your wages or pension.
"If you have any queries or need assistance filing your return, contact the LPT helpline on 1890 200 255."
Householders whose tax is still outstanding have been urged to file their return online.