You said that we need to pay quarterly taxes. What happens if we don't? We feel our income next year will be lower.

[jtax]

If you're right and you have paid "enough" you will be fine. If you're wrong and you should have paid more, you will owe interest from when you should have paid. The interest rate is currently 6% and it applies for each day you are late, calculated based on the required quarterly payments. TT will figure that out for you next year if need be.

This TT article describes the "safe harbors" (no interest) cases, under the heading "Do I need to pay estimated taxes?"

https://turbotax.intuit.com/tax-tips/small-business-taxes/estimated-taxes-how-to-determine-what-to-p...