Oh no. You mean you have gone all year without having tax withheld? You can change your W-4 with your employer right away and have them start withholding tax but that will not get you out of the hole with only a couple of months left in 2020. You can make an estimated tax payment on the IRS site:
https://www.irs.gov/payments/direct-pay
The tax system is "pay as you go" so you might still end up with an underpayment penalty at tax time and you should expect to owe tax due---but we do not know enough about your income, dependents, filing status, etc. to know that for certain.
Try the taxcaster tool to get an idea of where you will stand at tax time. (it is the tool for 2019 but the tax laws are so similar that it should work for this purpose)
https://turbotax.intuit.com/tax-tools/calculators/taxcaster/
And....are you in a state that has a state income tax? You may also owe your state.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
