Some 33,000 people in Finland are at risk of having their tax refunds delayed due to incomplete or missing bank details.
These taxpayers' refunds total nearly 2.2 million euros. Account numbers are most often missing for young, first-time taxpayers, officials say.
"We hope that parents of young people would remind their children to provide their account numbers so as to avoid disappointment on tax refund days," Tax Administration senior advisor Juha Villman said in a statement on Friday.
Update details by 27 July
To ensure you receive your possible tax refund in August, you must enter your account number in the MyTax (OmaVero) service by 27 July at the latest.
Otherwise, the tax refund will be paid as a money order, which can be redeemed later at Nordea Bank, and may be subject to a fee.
On 3 August, 2.1 million people in Finland – or some 45 percent of the adult population – are set to receive tax refunds, totalling around a billion euros.
However, your tax refund may not appear in your account immediately that morning.
"Many people may wonder why tax refunds do not appear in their accounts immediately. It's best to be patient. Tax refunds may not be paid until later in the day," Villman said.
Another tranche of refunds is due in September, when the refund total will be almost the same, although there will be significantly fewer recipients.