You may owe the IRS money on Monday — skipping payment could cost you hundreds of dollars

Some taxpayers may not be aware that they owe the IRS a check on Monday, which could lead to their owing the agency a chunk of change come next April. 

More Americans are getting caught up by the issue, which involves quarterly estimated taxes, or payments made to the IRS throughout the year on income that isn't subject to withholding. People who are paid by an employer typically have their federal, state and payroll taxes withheld directly from their paychecks. But millions of Americans today earn extra money as self-employed workers or through their own businesses, where taxes aren't deducted.

In those cases, taxpayers are required to send the IRS their estimated tax payments on a quarterly basis, with the next due date falling on June 17. The IRS says that taxpayers who are employed can also sidestep the issue by asking their employer to withhold more money from their paychecks, but of course that depends on workers first being aware that they might owe additional taxes.