I just meant it doesn't matter if you change the amounts and not pay the same amount each quarter. Yes you are suppose to pay in evenly or really as you get the income. Yes W2 and 1099 withholding is considered to be paid evenly during the year. If Turbo Tax ends up giving you a penalty on your tax return next year you might be able to eliminate it or at least reduce it. You can go to Federal Taxes tab or Personal tab, under Other Tax Situations and select Start by the Underpayment Penalties. You will answer a series of questions that may reduce or eliminate the penalty. Or you can elect to have the IRS figure the penalty for you. It's form 2210.
Here is IRS Form 2210
https://www.irs.gov/pub/irs-pdf/f2210.pdf
IRS Form 2210 Instructions
https://www.irs.gov/pub/irs-pdf/i2210.pdf
