How much should I withhold for taxes?

22% would be much to lower. Figure 15% for self-employment tax and 15% for federal income tax. That's 30% if you follow the law that requires you to send the estimates to the IRS by specific dates. If you hold onto the money until taxes are filed, then add another 6% for the penalty.

Your net income is taxable. You subtract your business expenses such as lease payments, fuel, maintenance, tolls, lumper's fees, licenses & permits, heavy vehicle excise tax, 50% of meals away from home, etc. from the gross to arrive at your net.

You'll owe about 14.16% in self-employment tax on the net. Income tax will depend upon your marital status, filing status, number and ages of children, and other factors. You likely won't owe any income tax at all if both children will be under age 17 as of the end of the year and your net is less than $50,000. Above that, allow at least 15% of the excess for tax up to $85k and 25% of the excess above $85k.

You need to make quarterly estimated tax payments to avoid underpayment penalties. Use Form 1040-ES https://www.irs.gov/pub/irs-pdf/f1040es.pdf to estimate your tax liability for the year and calculate the payments.

Figure about 30%. But you need to make quarterly payments to the IRS, and if your state or local area have an income tax, to them aslo.

you will report your 1099 M on Sch C and the self employment tax on Sch SE

if you follow the formula, .9235% of your sch C net amount is then multiplied by 15.3%

ie if your net income is $10K, $9235 x 15.3% is $1413

and you don't set it aside if your anticipated taxes both income and se is $1K more you will prepay each quarter on for 1040ES

and there is no way your se tax is 1/3rd of your profit

Depends on what you make, at least 25%

About a third of your profit