Hi There:
Firstly, It's important to distinguish between an IRS payment plan for back taxes and estimated taxes for future taxes. In the case of an IRS payment plan, changing the agreed upon payment will negate the agreement and have negative consequences. I mention this because typically the IRS does not set up estimated payments since future income is unknown, but I suppose its possible.
Anyway quarterly estimates are voluntary and can be changed as your income changes. The only repercussion is penalty if you end up owing too much.
The Turbo Tax – Tax Caster app is a helpful application to estimate future taxes
TaxCaster
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