How to Send a Proposal Clients Can Sign and Pay Online (2026)

The fastest way to get paid for new work is to stop treating the proposal, the signature and the invoice as three separate jobs. When a client can read your scope, accept it, sign it and pay the deposit on one page, nothing waits on you to remember the next step. This guide covers what a proposal should contain, how deposits and e-signatures work, how to connect acceptance to payment, and how to handle retainers. It is tool-neutral first, then shows one way to do it in a single place.

If you would rather have the setup done for you, App369 offers a fixed-price Workspace369 setup for freelancers and small agencies.

What a good proposal contains

A proposal is a short agreement, not a pitch deck. Clients sign it and later point to it when something is unclear, so write it for that moment. Cover:

1. Scope. What you will do, in plain sentences. "Design a five-page marketing site" beats "website design."
2. Deliverables. The files, pages, edits or sessions the client receives, and in what format.
3. Timeline. Start date, milestones, and what you need from the client and by when. Late feedback moves dates; say so.
4. Price. One total, or a short itemized list. Say whether it is fixed or hourly.
5. Payment terms. The deposit, the schedule, the due date for each payment, and the accepted payment methods.
6. What's not included. Extra revision rounds, stock assets, hosting, rush work, anything the client might assume is covered. This is the section that prevents most arguments.
7. Revisions and changes. How many rounds are included and how extra work is quoted.
8. Acceptance. A line saying that signing means the client agrees to the scope and terms.

Keep it to a few pages. Anything a client has to hunt for is something they will skip.

Deposits vs full upfront

Both are common, and neither is universally right.

• A deposit (often a fraction of the total, with the balance at a milestone or on delivery) lowers the barrier for the client and still commits them. It suits larger projects.
• Full payment upfront removes chasing completely and suits small, fast, fixed-price work.
• Milestone payments tie each payment to a deliverable, which works for projects spanning weeks.

Whichever you choose, put the exact amounts and dates in the proposal, and make the first payment due at acceptance. A deposit that is "due soon" tends to become "due eventually."

E-signatures: the basics

An electronic signature can be as simple as a typed name or a click, captured together with a record of who signed, when, and what version they signed. In the United States, the federal ESIGN Act says a signature or contract may not be denied legal effect, validity or enforceability solely because it is in electronic form; see 15 U.S.C. 7001. Some document types are excluded and rules vary by state and country, so this is not legal advice. If your contracts are high-value or unusual, have a lawyer review your template once.

For ordinary freelance work, what matters in practice is that the signed copy is stored, dated and easy for both sides to find later. A PDF in your inbox that you can't locate is not much of a record.

Connect acceptance to the invoice and payment

The slow part of most freelance workflows is the gap between "yes" and "invoice sent." Close it:

1. The client accepts and signs the proposal.
2. The deposit invoice is created automatically from the accepted proposal's line items, so nobody retypes numbers.
3. The client pays from the same email or portal, with card or bank transfer.

For payments, many freelancers use Stripe. Stripe Invoicing gives you a hosted invoice page the client can pay from, and lets you choose from many payment methods. For US clients, ACH Direct Debit lets them pay from a bank account, but it is a delayed-notification method: Stripe says it can take up to 4 business days to confirm success or failure, so treat a card payment and an ACH payment as different speeds. You open your own Stripe account and complete its identity and bank verification yourself; nobody else can do that for you.

Reminders and follow-up

Most unpaid proposals and invoices are not refusals; they are forgotten. A few automations remove the awkward part:

• Proposal viewed but not signed: a short reminder after two or three days.
• Invoice due soon: a heads-up a few days before.
• Invoice overdue: a polite nudge the day after, then another a week later.

Write these once, in your own voice, and let software send them. Keep the tone the same as your proposals. If you invoice through Stripe, its automatic collection tools include reminder emails too.

Project proposals vs retainer proposals

Keep two templates.

Project proposal. A defined outcome, a fixed end date, a deposit and a final payment. Scope and exclusions do most of the work.

Retainer proposal. An ongoing arrangement, so replace the end date with a monthly allowance: what hours or deliverables are included per month, response times, what happens to unused time, how to add work, and how either side ends the arrangement (notice period). Then bill it with a recurring invoice that goes out on the same day each month. Agree in the proposal whether the card or bank account is charged automatically; a recurring invoice that someone has to approve each month is a retainer with a weak spot.

One way to do it in one place

You can assemble this from a document editor, a signature tool, Stripe and a spreadsheet. Many people do, and it works until the pieces drift apart. Workspace369, the production Flutter and Firebase product Simon builds and runs, puts proposals, e-signature, invoices, online payment, recurring invoices and email automations in one workspace, so an accepted proposal turns into an invoice without retyping.

Plan facts, as of this writing: Cadet is $29/month for 1 seat, Voyager is $74/month for 2 seats, and Specialist is $149/month for 10 seats, with a 14-day trial. Intake forms need Voyager or higher, and online booking needs Specialist or higher. Check the pricing page before you decide, because prices change.

When to get help

If you would rather start with everything working, App369's Workspace369 setup is done for you at a fixed price. Solo Setup is $450 and takes 3 business days: your branding, a client import of up to 100 clients, 2 proposal templates (for example one project and one retainer), 1 invoice template with online payment, a recurring invoice or retainer schedule, 2 email automations, a recorded walkthrough and 7 days of written support. Team Setup is $1,500 and takes 5 business days, for small agencies: up to 250 clients, 3 proposal templates, 2 invoice templates, a public intake form, 3 automations, a booking page (Specialist or higher), and 14 days of support. You pay for your own Workspace369 plan, and you complete your own Stripe onboarding. For a developer-specific walkthrough, see Best CRM for freelance developers.

Frequently Asked Questions

Can a client legally sign a proposal electronically?

In the United States, the ESIGN Act generally gives electronic signatures and records legal effect, and a contract can't be denied effect solely because an e-signature was used. There are exceptions and state or country variations, so this isn't legal advice.

Should I ask for a deposit before starting work?

Many freelancers do, because it commits the client and covers early costs. State the amount and due date in the proposal, and make the first payment due at acceptance.

How do clients pay a proposal online?

Usually through an invoice created from the accepted proposal, with a payment page that accepts cards or, in the US, bank transfers through a processor such as Stripe. You need your own processor account.

How do I invoice a monthly retainer?

Set up a recurring invoice on a fixed date each month, and state in the proposal what the monthly amount covers, how unused time is handled, and the notice period to end it.

How long should a freelance proposal be?

Long enough to cover scope, deliverables, timeline, price, payment terms and exclusions, and no longer. For most projects that is a few pages.