If you want your customer to see an estimated tax figure on a proposal before they approve it, there's a toggle for that.

The proposal shows a single Estimated Tax figure for the whole job — it's not split out per work area, per line item, or per payment in the schedule. If you've also set up a payment schedule (for example, a deposit + progress payments + final payment), each payment line shows its pre-tax share only; tax doesn't get divided across those lines.

Tax is actually calculated later, when each invoice is generated, based on the taxable items or work areas billed on that specific invoice. So the proposal's Estimated Tax is a preview of the whole job's tax — not a document that tells you how much tax applies to any one payment.

For a full walkthrough of how tax flows across a payment schedule, deposits, and invoices — including what to tell a customer who asks "how much of my deposit is tax?" — see Where Does My Customer's Deposit Show Up? (And Where It Doesn't).