Tax account for the self-employed.

Since your earnings aren’t subject to withholding, under the pay-as-you-go system, you pay your taxes for the year through quarterly estimated tax payments. To make sure you have the funds on hand when these taxes are due, set up a separate bank or money market account for this purpose. Fund it regularly (e.g., weekly, monthly) with a set amount so you’ll have the money when it’s needed and avoid estimated tax penalties.