Hi @LPMurray !
It sounds like you have a good plan for the amount you are estimating. I would definitely make the September 15th estimated payment and include anything for up to that point.
Here are a couple resources that you may find useful:
https://turbotax.intuit.com/tax-tips/small-business-taxes/estimated-taxes-how-to-determine-what-to-p...
https://turbotax.intuit.com/personal-taxes/self-employment-taxes/
Hope this helps!
Cindy
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