You may have had an underpayment penalty that was generated with your return.
The underpayment penalty is calculated if you do not have enough withheld in income taxes throughout the year as you earn your income.
You can try to reduce your underpayment penalty by following the tip at the bottom of the link below.
Underpayment penalties
Also, the vouchers are generated to ensure you pay enough in throughout the year as you earn your income. If you have withholdings from wages, you can always adjust those through your employer to ensure you have enough withheld in taxes throughout the year to ensure taxes are being withheld in accordance with any income earned.
Updating W-4 Withholding form
@rkierski
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