Invoice software with a client portal: what your clients actually get

If you are looking for invoice software with a client portal, it is probably because of an email you keep getting. A client writes to ask if you can resend the invoice. Another asks how they pay it. A third wants every invoice from last year for their accountant, and you spend an evening attaching PDFs one at a time.

None of those clients is being difficult. They just have nowhere to look except their own inbox.

The short answer: the best invoice software with a client portal is the one your clients will actually open. Check four things: whether the client has to create a login, whether they can see every invoice and not only the latest, whether they can pay and approve quotes there, and whether they can get a statement or files without asking you.

Is this you?

• Clients regularly ask you to resend an invoice they have already received.
• You answer the same question, how do I pay this, more than once a month.
• At year end, clients or their accountants ask for a list of everything you billed them.
• A client paid the wrong amount because they were looking at an old copy.
• You are never sure whether a client has even seen an invoice until they pay it.
• You have considered a portal, and worried clients would never log in to it.

That last worry is the right one to have, and it is the thing that separates these tools.

What a client portal is, from the client's side

A client portal is a web page where your client can see what you have sent them and act on it, without writing to you. The word covers two quite different things, and most confusion comes from mixing them up.

A document link. The client clicks a link in the invoice email and sees that one invoice in a browser, with a button to pay or download it. There is nothing to sign up for. Almost every invoicing tool does at least this.

A client account. The client has their own login and a dashboard: every invoice and quote, payments made, sometimes statements, files, messages and project progress. This is what most people mean by a portal, and it is where tools differ.

Neither is better in itself. A login protects the client's history and lets them come back any time, but it is one more password, and a client who will not create one never sees what is behind it. A link has no friction at all, but anyone the email is forwarded to can open it, so it is as private as the email it arrived in.

Why clients pay slower when they cannot find the invoice

An invoice the client cannot find again is an invoice waiting on you. Each resend adds days. Our own payment data points the same way:

Invoices the client opened online were paid 6.9 days sooner than invoices never opened (a correlation, not proof of cause).

Source: Billbooks invoice payment study, 53,095 paid invoices from 180 businesses, 2007 to August 2026. See the study.

Read that with care. It does not show that a portal makes clients pay faster. Clients who intend to pay promptly may simply be the ones who open the link. What it does suggest is that an invoice the client has looked at online, with a pay button beside it, is in better shape than one sitting unread as an attachment.

The four things to check

1. Does the client have to create a login?

Ask what happens the first time a client clicks. If they can see and pay the invoice straight away, the portal will get used. If they must set a password first, some will not bother, and you are back to resending PDFs. The most forgiving setups do both: a link that always works, and an optional account for clients who want more.

2. Can they see everything, or only the invoice in front of them?

The resend emails stop only when a client can find past invoices on their own. Check whether the client can reach a list of all their invoices and quotes with you, with what is paid and what is still owed.

3. Can they act there?

Viewing is half of it. A client should be able to pay the invoice online, download a PDF, and accept or decline a quote, all from the same page. If they have to reply by email to say yes, the portal is only a viewer.

4. Can they get statements and files without asking you?

This is the year-end request. Some portals let a client produce a statement of account for any period. Some also hold contracts and shared files, or show project progress. If you invoice and nothing else, you may not need this. If clients often ask where a project stands, you do.

Which tools give the client what

From each company's own help pages and product pages, read in October 2026 and linked beside each entry. We list only what we checked, so a tool that is not here has not been checked, not ruled out.

• FreshBooks does both. Clients can pay and view invoices, estimates and proposals from the link without signing up, and a free client account lets them save, view and comment on those documents, save payment details and work on projects they are invited to (FreshBooks: how client accounts work). See Billbooks vs FreshBooks.
• Zoho Invoice has a full customer portal that you invite each client to. They accept the invite, create a password, and can then view estimates, invoices, a statement of accounts, projects and time entries, accept or decline estimates, pay, and leave comments (Zoho Invoice: customer portal). See Billbooks vs Zoho Invoice.
• Invoice Ninja has the deepest invoicing portal of the tools here: invoices, recurring invoices, payments, quotes, credits, saved payment methods, shared documents, and statements the client can generate for any date range. Clients arrive through the link in any email, and its product page lists the portal on all plans, with a custom domain on Enterprise (Invoice Ninja: client portal guide). See Billbooks vs Invoice Ninja.
• Xero shows each invoice online from a link. To see everything they owe you, the client clicks Outstanding bills on that invoice and logs in to Xero, or creates a free Xero login first. They can then download an activity or outstanding statement (Xero: view your outstanding bills online). See Billbooks vs Xero.
• QuickBooks Online emails the customer a link to pay the invoice (QuickBooks: receive and process payments). We did not find a customer login for past invoices described in its help pages, so treat it as a document link until you have confirmed otherwise on a trial. See Billbooks vs QuickBooks.
• Bonsai treats the portal as a project hub: clients see projects, documents, invoices and files and can message your team, through secure links that do not require them to create an account. It can carry your own branding (Bonsai: client portal). See Billbooks vs Bonsai.
• HoneyBook gives each project a client portal with activity, files, payments and shared notes, where clients can also upload their own files. They log in with an emailed link, a password or a six-digit code (HoneyBook: what clients can see and do, how clients access the portal). See our HoneyBook alternative guide.
• Billbooks sits at the simple end. Every invoice and quote opens from its own link with no login. The client can view it, download the PDF, pay online when you have connected a payment gateway, approve or decline a quote, and open a list of their other invoices and quotes from you with the balances. That is on every plan, from $7.95 a month. What it does not have: a client login, a statement the client can download, file sharing, or messaging. See how the Billbooks client link works.

So the choice follows what your clients ask you for. If they ask for statements and a place to log in, Invoice Ninja and Zoho Invoice are built for that. If the portal is really about the project, with files and messages, look at Bonsai or HoneyBook. If the only requests are resend it and how do I pay, a link that needs no login answers both, and FreshBooks and Billbooks both work that way.

What to do now, with what you already have

1. Count the requests. Search your sent mail for the last three months and count how often you resent an invoice or explained how to pay. That number tells you how much portal you need.
2. Put how to pay on the invoice itself. Bank details or a payment link, in the same place every time. Most how do I pay emails are answered by this alone.
3. Name the files so they can be found. Your business name, the invoice number and the date in the PDF file name, so a client searching their inbox finds it.
4. Send a statement before you are asked. Once a quarter, one page listing each invoice, what is paid and what is owed. It does the job of a portal for clients who will never log in to one.
5. Test any tool as the client. On a trial, send an invoice to your personal email and open it on your phone. Count the taps to see it, to pay it and to find an older one. Then choose.

If a client is already confused

When a client has paid the wrong amount, or says they never received an invoice that is now overdue, do not argue about what was sent. Send one message with a current statement: each invoice, each payment received, and the balance. Ask them to tell you if any line looks wrong. It resets the conversation to one shared list, which is all a portal would have given them.

How to stop the resend emails for good

The habit that matters is one place the client can always go back to. A portal is the tidy way to provide it, whether that is a login with full history or a link that opens without one. Pick by the four checks above, and by how your clients behave: people who will not create a password need a link, and clients with an accounts department often prefer a login and a statement.

If quotes are part of the same back and forth, see which software turns a quote into an invoice, and for why invoices are paid late in the first place, what late invoices have in common.

Free tools for getting an invoice seen and paid