What Is Contract and Invoice Software?
Contract and invoice software lets you send a contract for e-signature and bill the client with an invoice in the same tool, so the agreement and the payment stay connected. The contract sets the terms and the price, and the invoice collects on them, so keeping both in one place means the amount you bill always matches what the client signed.
Freelancers reach for this pairing because the two most vulnerable parts of freelancing are the legal side and the money side. A tool like AgencyKit handles both: a signed contract and the invoice that bills it, with no gap between the agreement and getting paid.
Why Combine Contracts and Invoicing?
The direct answer: separate tools mean the terms live in one app and the money in another, with nothing linking them. Combined contract and invoice software keeps the signed agreement and the bill in one place, so billing always reflects the contract.
A standalone e-signature tool like DocuSign signs beautifully but does not invoice, and a pure invoicing tool bills but does not manage contracts. For freelancers and agencies who want the agreement and the payment connected, an all-in-one that does both is the fit, which is why the tools worth comparing here are suites, not single-feature apps.
Get it signed, then get paid, without a gap
The riskiest moment in freelancing is the gap between agreeing to work and getting paid for it. A tool that holds the signed contract and generates the matching invoice closes that gap: the terms are binding, and the bill reflects them exactly. That connection is the whole point of choosing contract and invoice software together.
What to Look For in Contract and Invoice Software
- Contracts with legally binding e-signature.
- Invoices with online payments by card and bank transfer.
- A link between them, so the invoice reflects the signed contract, and ideally a proposal that leads into both.
- Recurring and retainer billing for ongoing clients.
- Fair, per-account pricing and worldwide availability.
The Best Contract and Invoice Software in 2026
Here are the strongest options for handling contracts and invoicing together. Prices are approximate and change, so confirm the current figures.
| Tool | Best for | From |
|---|---|---|
| AgencyKit | Contracts with e-sign plus invoicing and retainers, worldwide | $9/month |
| Bonsai | Freelancers wanting contracts and invoicing together | about $21/month |
| Assembly | Agencies wanting contracts, invoicing, and a portal | about $39/month |
| Clientary | Contracts with digital signatures that convert to invoices | varies |
| FreshBooks | Established freelancers wanting strong invoicing and accounting | about $19/month |
| Square Invoices | Simple invoicing and contracts with a free tier | free plan |
AgencyKit pairs contracts with e-signature and invoicing, plus proposals and retainers, at a flat per-account price and worldwide. Bonsai is a strong solo freelancer suite for contracts and invoicing. Assembly adds a full agency portal. Clientary turns a signed contract into an invoice in one click. FreshBooks is invoicing-and-accounting led, and Square Invoices offers simple invoicing and contracts with a free tier.
Why AgencyKit Is a Top Pick
AgencyKit keeps the agreement and the payment connected end to end. A proposal becomes a contract with e-signature and then an invoice, ongoing clients run on retainers, and everything sits in one place with a branded client portal. Pricing is one flat fee per account from $9 a month, and it works internationally, with a 14-day free trial and no card.
Key Takeaways
The short version
Contract and invoice software keeps a signed agreement and the bill that collects on it in one place, so billing always matches the contract. A standalone e-signature tool cannot invoice, and a pure invoicing tool cannot manage contracts. AgencyKit handles both, plus proposals and retainers, from $9 a month per account, worldwide.
Related Guides
See the best proposal and invoice software, the software to send proposals, contracts, and invoices, and the free freelance contract template.
Key Takeaways
- Contract and invoice software keeps a signed agreement and the bill that collects on it in one place
- A standalone e-signature tool cannot invoice, and a pure invoicing tool cannot manage contracts
- Look for e-signature, online payments, a link so the invoice reflects the contract, and recurring billing
- The best options are all-in-ones: AgencyKit, Bonsai, Assembly, and Clientary, with FreshBooks and Square fitting narrower cases
- AgencyKit handles contracts and invoicing, plus proposals and retainers, from $9/month per account, worldwide
Frequently Asked Questions
The best fit is an all-in-one that pairs contracts with e-signature and invoicing, so the signed agreement and the bill stay connected. AgencyKit does this, plus proposals and retainers, from $9 a month per account, worldwide. Bonsai suits solo freelancers, Assembly adds a full agency portal, Clientary converts a signed contract into an invoice, and FreshBooks leads on invoicing and accounting.
Yes. All-in-one tools like AgencyKit, Bonsai, Assembly, and Clientary let you send a contract for e-signature and bill the client with an invoice in the same place, with the invoice reflecting the signed contract. This is the main reason to choose combined contract and invoice software rather than a standalone e-signature app plus a separate invoicing app.
No. DocuSign is a dedicated e-signature tool, so it signs contracts but does not create or send invoices or collect payment. If you want the signed agreement and the invoice connected, you need a tool that does both. That is why freelancers and agencies looking for contract and invoice software choose an all-in-one suite rather than a single-feature e-signature giant.
Some tools offer free tiers. Square Invoices, for example, provides simple invoicing and contracts with a free plan, and Wave offers free invoicing. Full all-in-ones that also handle proposals and retainers usually start at a low monthly fee. AgencyKit starts at $9 a month per account with a 14-day free trial, so you can test the connected contract-to-invoice flow before paying.
Look for contracts with legally binding e-signature, invoices with online payments by card and bank transfer, a link so the invoice reflects the signed contract, recurring or retainer billing for ongoing clients, and fair per-account pricing with support for your country and currency. Ideally a proposal leads into the contract and invoice, so the whole flow is connected.
Because the two riskiest parts of freelancing are the legal side and the money side, and connecting them protects you. A signed contract sets the terms and price, and the matching invoice collects on them, so you are not chasing payment for work with no clear agreement, or holding a contract with no easy way to bill. Combined software closes the gap between agreeing and getting paid.
In an all-in-one tool, a signed contract carries the agreed scope and price, which the tool uses to generate a matching invoice, so you do not re-type anything. In AgencyKit, a proposal can become the contract and then the invoice, and for ongoing work a recurring retainer. This connection ensures the amount billed always equals the amount the client signed for.
Yes. AgencyKit pairs contracts with e-signature and invoicing with online payments, connected through proposals and retainers, so the agreement and the payment stay linked end to end. It is priced per account from $9 a month, covers a team, works internationally, and includes a branded client portal where clients sign and pay. There is a 14-day free trial with no card.
Sources & References
- G2 and Capterra, contract and invoicing software categories (2026). g2.com
- NerdWallet, best invoicing software for freelancers (2026). nerdwallet.com
- AgencyKit contracts, e-signature & invoicing (2026). agencykit.tech