Individuals, including sole proprietors, partners, and S corporation shareholders, generally use Form 1040-ES, to figure estimated tax. You can also use Tax Caster
https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes
To determine whether you can deduct an expense for your business, ask yourself: Is this expense both ordinary and necessary to the business? The IRS requires both elements.
- An expense is ordinary if it is common and accepted in your industry.
- An expense is necessary if it is helpful and appropriate for your business.
https://turbotax.intuit.com/tax-tips/small-business-taxes/taking-business-tax-deductions/L5RueYPVS
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