If you provide any type of estimate or bid—even a verbal quote—there are many reason to use estimates
You can use the QuickBooks estimate form to prepare professional-looking itemized
estimates, bids, quotes, or proposals for your customers. You can customize a QuickBooks estimate to look and say exactly
what you want it to.
When it's time to bill your customer, you can easily create an invoice from
the estimate with just one click. QuickBooks then creates
an invoice using information from your estimate.
When you need to know how accurate your estimates are, you can create reports that compare your estimated costs and revenue against your actual costs and revenue.
Creating estimates in QuickBooks will allow you to easily compare your actual costs against what you estimated. This will let you see how accurate your estimates are.
You can track which estimates are still active and easily update each estimate as you continue to negotiate with your customers.