But a midlands accountant says they don't have to worry about forking a lot of money.
People on the Pandemic Unemployment Payment who go back to work this year face a higher income tax bill.
Previously, the tax due on the PUP could be spread over four years.
This has been changed, so the tax will now be due in the year when someone returns to their job.
But John McCann from MCM Accounting in Tullamore says they don't have to worry about massive tax bills: